CN112751647A

CN112751647A - Method and apparatus for determining modulation and coding scheme

Info

Publication number: CN112751647A
Application number: CN201911053559.XA
Authority: CN
Inventors: 刘佳; 严朝译; 沈思多
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd; Shanghai Huawei Technologies Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2021-05-04
Also published as: WO2021083339A1

Abstract

The application provides a method and apparatus for determining a modulation and coding scheme. The application discloses a method for determining a modulation and coding scheme, which comprises the following steps: in the switching process, a target base station receives a first measurement result from a source base station, wherein the first measurement result is a measurement result obtained by a terminal device performing channel measurement on the target base station based on a reference signal; the target base station determines MCS according to the first measurement result; and the target base station transmits downlink data modulated and coded based on the MCS to the terminal equipment. The method and the device can improve the throughput rate of the terminal equipment.

Description

Method and apparatus for determining modulation and coding scheme

Technical Field

The present application relates to communication technologies, and in particular, to a method and an apparatus for determining a modulation and coding scheme.

Background

With the development of communication technology and the diversification of communication services, the amount of service data of users is larger and higher, and the requirement on the network speed is also higher and higher. To meet the needs of users, operators are constantly improving the capabilities of network devices and network solutions to increase the data transmission rate of users.

As one of basic functions of a wireless communication system, a handover function may ensure that a terminal device enjoys continuous coverage and service while moving in a network, and a base station determines whether to handover the terminal device to a cell with better signal quality according to reference signal qualities of a source base station and a neighboring cell fed back by the terminal device, for example, due to coverage, load or service, the signal becomes weaker when the terminal device moves to the edge of the coverage of the cell, or the load of the current serving cell of the terminal device is heavier and the load of the neighboring cell is lighter, and the terminal device may handover from the current base station to a target base station.

How to guarantee the throughput after the terminal equipment is switched to the target base station is an urgent problem to be solved.

Disclosure of Invention

The application provides a method and a device for determining a modulation and coding scheme, which can improve the throughput rate of terminal equipment by selecting a proper modulation and coding scheme for the terminal equipment.

In a first aspect, the present application provides a method of determining a modulation and coding scheme, comprising:

in the switching process, a target base station receives a first measurement result from a source base station, wherein the first measurement result is a measurement result obtained by a terminal device performing channel measurement on the target base station based on a reference signal; the target base station determines a Modulation and Coding Scheme (MCS) according to the first measurement result; and the target base station transmits downlink data modulated and coded based on the MCS to the terminal equipment.

In the method, a target base station acquires a channel measurement result of a terminal device from a source base station, determines an MCS based on the measurement result, and avoids the problem that the target base station cannot immediately allocate a reference signal resource to the terminal device after the terminal device is switched to the target base station, the terminal device cannot perform channel measurement based on the reference signal resource within a period of time, and the target base station cannot timely acquire a channel measurement result fed back by the terminal device, and cannot select an optimal Modulation and Coding Scheme (MCS) based on the channel measurement result, and only adopts a very conservative MCS, which causes a phenomenon of throughput reduction, thereby improving the throughput of the terminal device.

In one possible implementation, the first measurement result includes one or more of reference signal received power RSRP, reference signal received quality RSRQ, or signal to interference plus noise ratio SINR.

In a possible implementation manner, the determining, by the target base station, the MCS according to the first measurement result includes: when the first measurement result at least comprises the SINR, the target base station determines the MCS according to the SINR; when the first measurement result does not include the SINR but includes the RSRP or the RSRQ, the target base station determines the MCS according to the RSRP or the RSRQ.

In a possible implementation manner, the determining, by the target base station, the MCS according to the first measurement result includes: and the target base station takes the MCS corresponding to the first measurement result as the MCS according to the set corresponding relation between the measurement result and the MCS.

In a possible implementation manner, before the target base station determines the MCS according to the first measurement result, the method further includes: the target base station performs amplitude reduction processing on the first measurement result; the target base station determines the MCS according to the first measurement result, and the determining comprises: and the target base station determines the MCS according to the first measurement result after amplitude reduction.

In a possible implementation manner, the performing, by the target base station, amplitude reduction processing on the first measurement result includes: the target base station subtracts a set value from the first measurement result to obtain the first measurement result after amplitude reduction; or, the target base station multiplies the first measurement result by a weighting coefficient to obtain the reduced first measurement result, where the weighting coefficient is greater than 0 and smaller than 1.

In the method, the target base station performs amplitude reduction processing on the channel measurement result of the terminal equipment, and can determine a more conservative MCS on the basis of meeting the channel condition, thereby not only improving the throughput rate of the terminal equipment, but also avoiding the increase of the error rate.

In one possible implementation, the reference signal includes one or more of a channel state information reference signal, CSI-RS, a synchronization signal block, SSB, or a cell reference signal, CRS.

In a second aspect, the present application provides a method of determining a modulation and coding scheme, comprising:

a source base station determines a first measurement result, wherein the first measurement result is obtained by performing channel measurement on a target base station by a terminal device based on a reference signal; and the source base station sends the first measurement result to the target base station, wherein the first measurement result is used for determining a Modulation and Coding Scheme (MCS) of downlink data between the target base station and the terminal equipment.

In the method, after a source base station determines a target base station, a measurement result obtained by channel measurement of the target base station by a terminal device based on a reference signal is sent to the target base station, so that the target base station determines an MCS based on the measurement result, and the problem that the target base station cannot immediately allocate reference signal resources to the terminal device after the terminal device is switched to the target base station, the terminal device cannot perform channel measurement based on the reference signal resources within a period of time, and the target base station cannot timely acquire a channel measurement result fed back by the terminal device, cannot select the most appropriate MCS based on the channel measurement result, and only adopts a very conservative MCS, thereby causing the phenomenon of throughput reduction, and further improving the throughput rate of the terminal device.

In a third aspect, the present application provides a communication apparatus comprising:

a receiving module, configured to receive a first measurement result from a source base station during handover, where the first measurement result is a measurement result obtained by a terminal device performing channel measurement on the communication apparatus based on a reference signal; a processing module, configured to determine a modulation and coding scheme MCS according to the first measurement result; and the sending module is used for sending the downlink data modulated and coded based on the MCS to the terminal equipment.

In a possible implementation manner, the processing module is specifically configured to determine the MCS according to the SINR when the first measurement result at least includes the SINR; when the first measurement result does not include the SINR but includes the RSRP or the RSRQ, determining the MCS according to the RSRP or the RSRQ.

In a possible implementation manner, the processing module is specifically configured to use an MCS corresponding to the first measurement result as the MCS according to a set correspondence between the measurement result and the MCS.

In a possible implementation manner, the processing module is further configured to perform amplitude reduction processing on the first measurement result; and determining the MCS according to the first measurement result after amplitude reduction.

In a possible implementation manner, the processing module is specifically configured to subtract a set value from the first measurement result to obtain the reduced first measurement result; or multiplying the first measurement result by a weighting coefficient to obtain the reduced first measurement result, wherein the weighting coefficient is greater than 0 and smaller than 1.

In a fourth aspect, the present application provides a communication apparatus comprising:

the processing module is used for determining a first measurement result, wherein the first measurement result is obtained by the terminal equipment performing channel measurement on a target base station based on a reference signal; a sending module, configured to send the first measurement result to the target base station, where the first measurement result is used to determine a modulation and coding scheme MCS of downlink data between the target base station and the terminal device.

In a fifth aspect, the present application provides a communication device, which may be a base station or a chip in a base station, comprising a processor for executing a computer program or instructions to cause the communication device to perform the method of any of the first to second aspects.

Optionally, the communication device further comprises a memory. The processor is coupled to a memory for storing computer programs or instructions, and the processor is configured to execute the computer programs or instructions in the memory.

Optionally, the communication apparatus may further include a communication unit for communicating with other devices or other components in the communication apparatus. For example, the communication device is a base station and the communication unit is a transceiver. For example, the communication device is a chip of a base station, and the communication unit is an input/output circuit or an interface of the chip.

In a sixth aspect, the present application provides a chip comprising a processor and interface circuitry, the interface circuitry being coupled to the processor, the processor being configured to execute a computer program or instructions to implement the method according to any of the first to second aspects as described above, the interface circuitry being configured to communicate with other modules outside the chip.

In a seventh aspect, the present application provides a computer storage medium storing a program for implementing the method of any one of the first to second aspects. When the program is run in a communication device, the program causes the communication device to perform the method of any of the first to second aspects described above.

In an eighth aspect, the present application provides a computer program product comprising a program which, when executed, causes the method of any of the first to second aspects to be performed.

In a ninth aspect, the present application provides a communication system, comprising a base station and a terminal device, wherein the base station includes the communication apparatus in any one of the third to fourth aspects.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

fig. 2 schematically shows a structure of a communication apparatus;

fig. 3 is a flowchart of a first embodiment of a method for determining a modulation and coding scheme according to an embodiment of the present application;

fig. 4 is a flowchart of a second embodiment of a method for determining a modulation and coding scheme according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a first embodiment of a communication device according to the present application;

fig. 6 is a schematic structural diagram of a second communication device according to an embodiment of the present application.

Detailed Description

To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," and the like in the description examples and claims of this application and in the drawings are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order. Furthermore, the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover a non-exclusive inclusion, such as a list of steps or elements. A method, system, article, or apparatus is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, system, article, or apparatus.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application, and as shown in fig. 1, the communication system includes a terminal device, a source base station, and a neighbor base station, where the source base station and the neighbor base station may respectively establish a wireless connection with the terminal device. It should be noted that the terminal device, the source base station, and the neighboring base station included in the communication system shown in fig. 1 are only examples, and the connection manner between the source base station, the neighboring base station, and the terminal device is also only an example.

The communication system may be a communication system supporting a fourth generation (4G) access technology, such as a Long Term Evolution (LTE) access technology; alternatively, the communication system may also be a communication system supporting a fifth generation (5G) access technology, such as a New Radio (NR) access technology; alternatively, the communication system may also be a communication system supporting a plurality of wireless technologies, for example, a communication system supporting an LTE technology and an NR technology. In addition, the communication system may also be adapted for future-oriented communication technologies.

The source base station and the neighbor base station in this embodiment may be devices on an access network side for supporting the terminal device to access the communication system, and the devices may be referred to as Base Stations (BSs), for example, may be evolved node BS (enbs) in a 4G access technology communication system, next generation base stations (gnbs) in a 5G access technology communication system, Transmission Reception Point (TRP), relay node (relay node), Access Point (AP), and the like.

A terminal device (terminal) in this embodiment may be a device that provides voice or data connectivity to a user, and may be referred to as a User Equipment (UE), a mobile station (mobile station), a subscriber unit (subscriber unit), a station (station), a terminal device (TE), and so on. The terminal device may be a cellular phone (cellular phone), a Personal Digital Assistant (PDA), a wireless modem (modem), a handheld device (hand), a laptop computer (laptop computer), a cordless phone (cordless phone), a Wireless Local Loop (WLL) station, a tablet (pad), or the like. With the development of wireless communication technology, all devices that can access a wireless communication network, can communicate with a wireless network side, or communicate with other objects through the wireless network may be terminal devices in the embodiments of the present application, such as terminal devices and automobiles in intelligent transportation, home devices in smart homes, power meter reading instruments in smart grids, voltage monitoring instruments, environment monitoring instruments, video monitoring instruments in smart security networks, cash registers, and the like. The terminal device may be stationary or mobile.

The embodiment of the present application provides a method for determining a modulation and coding scheme, which is applicable to the communication system shown in fig. 1. The method comprises the steps that a source base station and adjacent base stations configure reference signals for terminal equipment, the terminal equipment carries out channel measurement on the basis of the reference signals configured by the source base station to obtain a measurement result between the terminal equipment and the source base station, the terminal equipment carries out channel measurement on the basis of the reference signals configured by the adjacent base stations to obtain a measurement result between the terminal equipment and the adjacent base stations, then the terminal equipment reports the measurement result between the terminal equipment and the source base station and the measurement result between the terminal equipment and the adjacent base stations to the source base station, and the source base station determines one of at least one adjacent base station as a target base station for switching according to the measurement results. The reference signal of the Long Term Evolution (LTE) communication system may be a cell-specific reference signal (CRS), and the reference signal of the New Radio (NR) communication system may be a Synchronization Signal Block (SSB) or a channel state information-reference signal (CSI-RS).

When the terminal equipment is switched to the target base station, the target base station cannot immediately allocate the reference signal resource to the terminal equipment, so that the terminal equipment cannot perform channel measurement based on the reference signal resource within a period of time, and the target base station cannot timely acquire a Channel Quality Indicator (CQI) fed back after the terminal equipment measures the reference signal, and cannot select an optimal Modulation and Coding Scheme (MCS) based on the CQI, and only a very conservative MCS can be adopted, but a TBSize obtained after downlink data is coded based on the conservative MCS is also very small, so that the throughput rate of the terminal equipment has very obvious loss.

The source base station or the target base station in the communication system may be collectively referred to as a communication device, and the communication device may be a base station or a chip in the base station.

Fig. 2 is a schematic structural diagram illustrating an exemplary communication apparatus, and reference may be made to the structure shown in fig. 2 for the structure of a source base station or a target base station in the embodiment of the present application.

The communication device includes at least one processor 111, at least one memory 112, at least one transceiver 113, at least one network interface 114, and one or more antennas 115. The processor 111, the memory 112, the transceiver 113 and the network interface 114 are connected, for example, by a bus, and in this embodiment, the connection may include various interfaces, transmission lines or buses, which is not limited in this embodiment. The antenna 115 is connected to the transceiver 113. The network interface 114 is used to connect the communication apparatus with other communication devices through communication links, for example, the network interface 114 may include a network interface between the communication apparatus and a core network element, such as an S1 interface, and the network interface may include a network interface between the communication apparatus and other network devices (such as other communication apparatuses or core network elements), such as an X2 or Xn interface. For example, the source base station and the target base station may be connected via a network interface, such as an X2 or Xn interface.

The processor 111 is mainly used for processing the communication protocol and the communication data, controlling the whole communication device, executing the software program, and processing data of the software program, for example, for supporting the communication device to perform the actions described in the embodiments. The communication device may include a baseband processor for processing communication protocols and communication data, and a central processing unit for controlling the entire communication device, executing software programs, and processing data of the software programs. The processor 111 in fig. 2 may integrate the functions of a baseband processor and a central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the communication device may include a plurality of baseband processors to accommodate different network formats, a plurality of central processors to enhance its processing capability, and various components of the communication device may be connected by various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the memory in the form of a software program, and the processor executes the software program to realize the baseband processing function.

The memory is used primarily for storing software programs and data. The memory 112 may be separate and coupled to the processor 111. Alternatively, the memory 112 may be integrated with the processor 111, for example, within one chip. The memory 112 can store program codes for executing the technical solutions of the embodiments of the present application, and the processor 111 controls the execution of the program codes, and various executed computer program codes can also be regarded as drivers of the processor 111.

Fig. 2 shows only one memory and one processor. In an actual communication device, there may be multiple processors and multiple memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be a memory element on the same chip as the processor, that is, an on-chip memory element, or a separate memory element, which is not limited in this embodiment.

The transceiver 113 may be used to support the reception or transmission of radio frequency signals between the communication device and the terminal equipment, and the transceiver 113 may be connected to the antenna 115. The transceiver 113 includes a transmitter Tx and a receiver Rx. Specifically, one or more antennas 115 may receive a radio frequency signal, and the receiver Rx of the transceiver 113 is configured to receive the radio frequency signal from the antenna, convert the radio frequency signal into a digital baseband signal or a digital intermediate frequency signal, and provide the digital baseband signal or the digital intermediate frequency signal to the processor 111, so that the processor 111 performs further processing on the digital baseband signal or the digital intermediate frequency signal, such as demodulation processing and decoding processing. In addition, the transmitter Tx in the transceiver 113 is also used to receive a modulated digital baseband signal or a digital intermediate frequency signal from the processor 111, convert the modulated digital baseband signal or the digital intermediate frequency signal into a radio frequency signal, and transmit the radio frequency signal through the one or more antennas 115. Specifically, the receiver Rx may selectively perform one or more stages of down-mixing and analog-to-digital conversion processes on the rf signal to obtain a digital baseband signal or a digital intermediate frequency signal, wherein the order of the down-mixing and analog-to-digital conversion processes is adjustable. The transmitter Tx may selectively perform one or more stages of up-mixing and digital-to-analog conversion processes on the modulated digital baseband signal or the modulated digital intermediate frequency signal to obtain the rf signal, where the order of the up-mixing and the digital-to-analog conversion processes is adjustable. The digital baseband signal and the digital intermediate frequency signal may be collectively referred to as a digital signal.

A transceiver may also be referred to as a transceiver unit, transceiver, transceiving means, etc. Optionally, a device for implementing a receiving function in the transceiver unit may be regarded as a receiving unit, and a device for implementing a sending function in the transceiver unit may be regarded as a sending unit, that is, the transceiver unit includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, and the like, and the sending unit may be referred to as a transmitter, a sending circuit, and the like.

Fig. 3 is a flowchart of a first embodiment of a method for determining a modulation and coding scheme according to the present invention, and as shown in fig. 3, the method according to the present embodiment may be applied to the communication system shown in fig. 1. The method of determining a modulation and coding scheme may include:

step 301, in the handover, the source base station sends a first measurement result to the target base station.

The first measurement result is a measurement result obtained by the terminal device performing channel measurement on the target base station based on the reference signal.

Alternatively, the handover may be based on an interface between base stations (e.g., X2, Xn, etc.), or may be based on an interface between a base station and a core network (e.g., S1). In the switching process, the switching process may include a switching preparation stage, a switching execution stage and a switching completion stage; or, it can be understood as a process before the source base station releases resources after the source base station makes a handover decision.

Optionally, the source base station sends the first measurement result to the target base station, and may reuse a message in the existing handover procedure, for example, after the source base station makes a handover decision, the source base station sends any message sent to the target base station by the source base station before the context release request message to the terminal device. Optionally, the message may be a handover request message.

Alternatively, the first measurement result may be carried by a newly added piece of signaling.

And step 302, the target base station determines the MCS according to the first measurement result.

Optionally, the target base station may send the MCS to the terminal device.

Step 303, the target base station sends downlink data modulated and encoded based on the MCS to the terminal device.

Optionally, the terminal device demodulates the downlink data of the target base station according to the MCS.

The target base station modulates and codes downlink data based on the MCS to obtain one or more Transport Blocks (TBs), wherein the size of each TB is represented by TBSize, and the higher the MCS is, the larger the TBSize is, and the higher the throughput rate is. However, if the MCS is too high, the terminal device will fail to demodulate the downlink data. Therefore, in the embodiment of the present application, the terminal device initially accesses the target base station, and the target base station does not need to wait until the terminal device is configured with the reference signal resource, and the terminal device performs channel measurement based on the reference signal resource, and then can determine the MCS that meets the channel condition after reporting the channel measurement result, and does not need to adopt a conservative MCS. The target base station determines the MCS according to the measurement result obtained by the channel measurement of the terminal equipment sent by the source base station, and can ensure that the MCS accords with the current channel condition. After receiving the downlink data, the terminal device may also reduce the error rate of demodulating the downlink data according to the MCS in the downlink control information.

In addition, the target base station acquires the channel measurement result of the terminal equipment from the source base station, determines the MCS based on the measurement result, and avoids the phenomenon that the target base station cannot immediately allocate the reference signal resource to the terminal equipment after the terminal equipment is switched to the target base station, the terminal equipment cannot perform channel measurement based on the reference signal resource within a period of time, and the target base station cannot timely acquire the channel measurement result fed back by the terminal equipment, so that the most appropriate MCS cannot be selected based on the channel measurement result, only a very conservative MCS can be adopted, and the throughput is reduced, thereby improving the throughput rate of the terminal equipment.

Fig. 4 is a flowchart of a second embodiment of a method for determining a modulation and coding scheme according to an embodiment of the present application, and as shown in fig. 4, the method according to this embodiment may be applied to the communication system shown in fig. 1. The method of determining a modulation and coding scheme may include:

step 401, the terminal device performs channel measurement respectively based on the reference signal configured by at least one neighboring base station to obtain at least one measurement result.

The reference signal includes one or more of CSI-RS, SSB, and CRS. The measurement results include one or more of reference-signal-received-power (RSRP), reference-signal-receiving-quality (RSRQ), and signal-to-interference-plus-noise-ratio (SINR).

When the terminal equipment is in wireless communication, besides the source base station accessed by the terminal equipment, at least one adjacent base station is arranged near the source base station, and when the terminal equipment moves, the switching function (switching from the source base station to a base station with better signal quality) can ensure that the terminal equipment can enjoy continuous coverage and service when moving in the network. And the terminal equipment performs channel measurement according to the reference signal configured by the source base station to obtain a measurement result aiming at the source base station, and performs channel measurement according to the reference signal configured by the adjacent base station to obtain a measurement result aiming at the adjacent base station.

Step 402, the terminal device reports at least one measurement result to the source base station.

The terminal equipment reports the measurement result of the channel measurement to the source base station, and in the related art, the terminal equipment reports both the measurement result for the source base station and the measurement result for at least one adjacent base station to the source base station.

Step 403, the source base station determines the target base station according to the at least one measurement result.

For example, for the NR communication system, the source base station may select a neighboring base station corresponding to a higher value (preferably the highest) as the target base station based on one of the received CSI-RS RSRP, CSI-RS RSRQ, and CSI-RS SINR (preferably, CSI-RS SINR, or CSI-RS RSRP or CSI-RS RSRQ if there is no CSI-RS SINR), or one of SSB RSRP, SSB RSRQ, and SSB SINR (preferably, SSB SINR, or SSB RSRP or SSB RSRQ if there is no SSB SINR). For the LTE communication system, the source base station may select, as the target base station, the neighboring base station corresponding to the higher-value (preferably the highest) base station based on the received measurement result (CRS SINR is preferentially selected, or CRS RSRP or CRS RSRQ is selected if there is no CRS SINR).

Steps 401 through 403 are optional.

Step 404, in the handover, the source base station sends a first measurement result to the target base station.

The technical principle of step 404 is similar to that of step 301, and is not described herein again.

And step 405, the target base station determines the MCS according to the first measurement result.

For example, for an NR communication system, the source base station may preferentially select CSI-RS SINR, select CSI-RS RSRP or CSI-RS RSRQ if there is no CSI-RS SINR, or preferentially select SSB SINR, select SSB RSRP or SSB RSRQ if there is no SSB SINR, to determine MCS. For an LTE communication system, the source base station may preferentially select CRS SINR, and select CRS RSRP or CRS RSRQ if there is no CRS SINR) to determine MCS.

After receiving the first measurement result sent by the source base station, the target base station returns a response message to the source base station if the terminal equipment is allowed to access the cell, and then triggers the terminal equipment to access the target base station; if the terminal equipment is refused to access the cell, a preparation failure message is returned to the source base station, and the source base station can continuously try to take other adjacent base stations as target base stations to trigger the terminal equipment to access a new target base station.

When the target base station determines that the terminal device can access, the target base station may use the MCS corresponding to the first measurement result as the MCS of the terminal device according to the set correspondence between the measurement result and the MCS.

Optionally, the setting may be understood that the target base station may write the corresponding relationship between the measurement result and the MCS when leaving the factory, or may be understood that the target base station may be sent to the target base station by other network devices, for example, sent to the target base station by a network manager, and the target base station may store the corresponding relationship.

Optionally, the corresponding relationship may be represented by a table, a graph, a formula, or the like, which is not limited in this embodiment of the application.

Optionally, the corresponding relationship between the measurement result and the MCS includes an MCS level selection table, and each entry in the MCS level selection table includes the measurement result and the MCS. Reference may be made to a correspondence between a Channel Quality Indicator (CQI) and an MCS defined by a third generation partnership project (3 GPP) protocol, for example, the content in 3GPP TS 36.213V15.7.0 section 7.1.7 and 3GPP TS 38.214V15.7.0 section 5.2.2, where the CQI is quantized according to RSRP, RSRQ or SINR, and a correspondence is set between the CQI and SINR, and when the value of SINR is in range 1, the value of CQI is m1, when the value of SINR is in range 2, the value of CQI is m2, and when the value of SINR is in range 3, the value of CQI is m3, … …, that is, the CQI may be understood as a rank value, and the rank to which it belongs is determined according to the value of SINR, which is taken as the CQI. Similar methods may be used for corresponding relationships between RSRP, RSRQ, and CQI, and are not described herein again. And then the corresponding relation between the RSRP, the RSRQ or the SINR and the MCS can be obtained through the CQI.

In a possible implementation manner, the target base station may perform amplitude reduction on the first measurement result first, that is, subtract a set value from the first measurement result to obtain a first measurement result after amplitude reduction; or multiplying the first measurement result by a weighting coefficient to obtain the reduced first measurement result, wherein the weighting coefficient is greater than 0 and less than 1. And determining the MCS of the terminal equipment according to the first measurement result after the amplitude reduction.

Illustratively, if the target base station receives the CSI-RS SINR, the CRS SINR, or the SSB SINR, the target base station may perform a certain amplitude reduction on the CSI-RS SINR, reduce the measurement result by several dB, and then select a corresponding MCS according to the MCS rank selection table. The advantage of the amplitude reduction processing is that the error rate of data transmission is prevented from being improved. For example, the CSI-RS SINR received by the target base station is 10dB, and in order to prevent the error rate from increasing, the target base station first calculates the CSI-RS SINR to be 10dB-3dB to be 7dB, and then searches the MCS rank selection table according to 7dB to obtain the corresponding MCS.

For example, if the target base station receives the CSI-RS RSRP or the CSI-RS RSRQ, the target base station may perform a certain amplitude reduction processing on the CSI-RS RSRP or the CSI-RS RSRQ, and select a corresponding MCS according to which interval range the CSI-RS RSRP or the CSI-RS RSRQ after the amplitude reduction processing falls. For example, if the CSI-RS RSRP after the amplitude reduction process is smaller than threshold 1, MCS is equal to N, if between { threshold 1, threshold 2}, MCS is equal to N + step, and if between { threshold 2, threshold 3}, MCS is equal to N +2 × step. And so on. Where threshold 1< threshold 2< threshold 3< … ….

In the embodiment of the present application, the target base station may further dynamically adjust the MCS in combination with an Adaptive Modulation and Coding (AMC) technique.

Step 406, the target base station sends downlink data modulated and encoded based on the MCS to the terminal device.

The technical principle of step 406 is similar to that of step 303 described above, and is not described here again.

According to the embodiment of the application, the target base station acquires the channel measurement result of the terminal equipment from the source base station, and determines the MCS based on the measurement result, so that the phenomenon that the throughput is reduced because the target base station cannot acquire the channel measurement result fed back by the terminal equipment in time and cannot select the most appropriate MCS based on the channel measurement result because the most appropriate MCS can only be adopted due to the fact that the reference signal resource cannot be allocated to the terminal equipment immediately after the terminal equipment is switched to the target base station and the terminal equipment cannot perform channel measurement based on the reference signal resource within a period of time is avoided, and the throughput of the terminal equipment is improved.

Fig. 5 is a schematic structural diagram of a first embodiment of a communication apparatus according to the present application, and as shown in fig. 5, the apparatus according to the present embodiment may be applied to a target base station. The communication device includes: a receiving module 501, a processing module 502 and a sending module 503. The receiving module 501 is configured to receive a first measurement result from a source base station during handover, where the first measurement result is a measurement result obtained by performing channel measurement on the communication apparatus by a terminal device based on a reference signal; a processing module 502, configured to determine a modulation and coding scheme MCS according to the first measurement result; a sending module 503, configured to send downlink data modulated and encoded based on the MCS to the terminal device.

In a possible implementation manner, the processing module 502 is specifically configured to determine the MCS according to the SINR when the first measurement result at least includes the SINR; when the first measurement result does not include the SINR but includes the RSRP or the RSRQ, determining the MCS according to the RSRP or the RSRQ.

In a possible implementation manner, the processing module 502 is specifically configured to use an MCS corresponding to the first measurement result as the MCS according to a set correspondence between the measurement result and the MCS.

In a possible implementation manner, the processing module 502 is further configured to perform amplitude reduction processing on the first measurement result; and determining the MCS according to the first measurement result after amplitude reduction.

In a possible implementation manner, the processing module 502 is specifically configured to subtract a set value from the first measurement result to obtain the reduced first measurement result; or multiplying the first measurement result by a weighting coefficient to obtain the reduced first measurement result, wherein the weighting coefficient is greater than 0 and smaller than 1.

Optionally, the communication apparatus may be a target base station, the receiving module 501 may include a network interface in the target base station, the sending module 503 may include a transceiver and an antenna in the target base station, and the processing module 502 may include one or more processors; or, alternatively, the communication device may be a chip in the target base station, and the receiving module 501 and the sending module 503 may include an input or output interface, a pin or a circuit, and the like.

Optionally, the communication device may further include a storage module for storing a program or data involved in the method of the target base station. The memory module may include one or more memories.

Fig. 6 is a schematic structural diagram of a second embodiment of a communication apparatus according to the present application, and as shown in fig. 6, the apparatus according to the present embodiment may be applied to a source base station. The communication device includes: a processing module 601 and a sending module 602. The processing module 601 is configured to determine a first measurement result, where the first measurement result is a measurement result obtained by performing channel measurement on a target base station by a terminal device based on a reference signal; a sending module 602, configured to send the first measurement result to the target base station, where the first measurement result is used to determine a modulation and coding scheme MCS of downlink data between the target base station and the terminal device.

The apparatus of this embodiment may be used to implement the technical solution of any one of the method embodiments shown in fig. 3 to 4, and the implementation principle and the technical effect are similar, which are not described herein again.

Optionally, the communication apparatus may further include a receiving module, configured to receive a first measurement result from the terminal, where the measurement result is a measurement result obtained by the terminal device performing channel measurement on the target base station based on the reference signal.

Optionally, the communication apparatus may be a source base station, the sending module 602 may include a network interface in the source base station, the processing module 602 may include one or more processors, and the receiving module may include a transceiver and an antenna in the source base station; or, alternatively, the communication device may be a chip in the source base station, and the transmitting module 602 and the receiving module may include an input or output interface, pins or circuits, and the like.

Optionally, the communication device may further include a storage module for storing a program or data involved in the method of the source base station. The memory module may include one or more memories.

In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by a hardware encoding processor, or implemented by a combination of hardware and software modules in the encoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

The memory referred to in the various embodiments above may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (personal computer, server, network device, or the like) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of determining a modulation and coding scheme, comprising:

in the switching process, a target base station receives a first measurement result from a source base station, wherein the first measurement result is a measurement result obtained by a terminal device performing channel measurement on the target base station based on a reference signal;

the target base station determines a Modulation and Coding Scheme (MCS) according to the first measurement result;

and the target base station transmits downlink data modulated and coded based on the MCS to the terminal equipment.

2. The method of claim 1, wherein the first measurement result comprises one or more of a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), or a signal to interference plus noise ratio (SINR).

3. The method of claim 2, wherein the target base station determines the MCS according to the first measurement result, comprising:

when the first measurement result at least comprises the SINR, the target base station determines the MCS according to the SINR;

when the first measurement result does not include the SINR but includes the RSRP or the RSRQ, the target base station determines the MCS according to the RSRP or the RSRQ.

4. The method of any of claims 1-3, wherein the target base station determining the MCS based on the first measurement result comprises:

and the target base station takes the MCS corresponding to the first measurement result as the MCS according to the set corresponding relation between the measurement result and the MCS.

5. The method of any of claims 1-4, wherein before the target base station determines the MCS based on the first measurement result, further comprising:

the target base station performs amplitude reduction processing on the first measurement result;

the target base station determines the MCS according to the first measurement result, and the determining comprises:

and the target base station determines the MCS according to the first measurement result after amplitude reduction.

6. The method of claim 5, wherein the step of performing, by the target base station, a de-amplification process on the first measurement result comprises:

the target base station subtracts a set value from the first measurement result to obtain the first measurement result after amplitude reduction; alternatively, the first and second electrodes may be,

and the target base station multiplies the first measurement result by a weighting coefficient to obtain the first measurement result after amplitude reduction, wherein the weighting coefficient is more than 0 and less than 1.

7. The method of any one of claims 1-6, wherein the reference signal comprises one or more of a channel state information reference signal (CSI-RS), a Synchronization Signal Block (SSB), or a Cell Reference Signal (CRS).

8. A method of determining a modulation and coding scheme, comprising:

a source base station determines a first measurement result, wherein the first measurement result is obtained by performing channel measurement on a target base station by a terminal device based on a reference signal;

and the source base station sends the first measurement result to the target base station, wherein the first measurement result is used for determining a Modulation and Coding Scheme (MCS) of downlink data between the target base station and the terminal equipment.

9. The method of claim 8, wherein the first measurement result comprises one or more of a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), or a signal to interference plus noise ratio (SINR).

10. The method of claim 8 or 9, wherein the reference signal comprises one or more of a channel state information reference signal, CSI-RS, a synchronization signal block, SSB, or a cell reference signal, CRS.

11. A communications apparatus comprising a processor coupled to a memory, the memory for storing a computer program or instructions, the processor for executing the computer program or instructions in the memory such that the method of any of claims 1 to 10 is performed.

12. A chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a computer program or instructions such that the method of any one of claims 1 to 10 is performed.

13. A computer storage medium storing a program or instructions for implementing the method of any one of claims 1 to 10.