A communication method and device

Abstract

A communication method is applicable to a system including a base station and vehicle-mounted terminal devices, wherein two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, and the method comprises the following steps: after the base station determines that there is a vehicle-mounted terminal device that meets set conditions among the vehicle-mounted terminal devices under the base station that can support at least two beams, the base station determines beam information for the vehicle-mounted terminal device that meets the set conditions; and the base station sends the beam information to the vehicle-mounted terminal device that meets the set conditions.

Description

Technical Field

[0001] The present application relates to the field of wireless communications, and in particular to a communication method and device. Background Art

[0002] At present, more and more subways are being built in major cities, and the requirements for real-time monitoring of subway trains are becoming higher and higher. The closed circuit television (CCTV) service proposed by the industry is used in rail transit systems to improve real-time monitoring of vehicles. For example, cities such as Beijing, Shenzhen, and Guangzhou in China are vigorously promoting the deployment of CCTV services.

[0003] Taking the subway train as an example, the data transmission process from the subway train to the server is usually as follows:

[0004] A. The camera data of subway trains is collected on the onboard terminal devices. Currently, most cameras are IP cameras, and the resolution required is generally up to 1080P and the frame rate is 25PPS.

[0005] B. The on-board terminal device communicates with the base station installed beside the track and uploads the train camera data to the base station in real time.

[0006] C. The base station uploads the camera data of the subway train to the video server of the control center through the subway ring network.

[0007] Relevant management departments can obtain video data by accessing the video server.

[0008] The main requirement of CCTV business for data transmission is that the data transmission rate needs to maintain a certain stability, that is, the data transmission rate cannot fluctuate greatly.

[0009] In current rail transit, base station antennas generally use directional antennas, installed on one side of the track and installed against the wall. For example, in a tunnel, the base station antenna installation requires a distance of less than 350mm from the tunnel wall and a distance of more than 400mm from the vehicle body. The height should be flush with the roof or slightly higher (within 50mm). Therefore, limited by the size of the antenna installation space in the tunnel, the typical antenna forms used on the base station side are flat antennas and Yagi antennas, and generally use linear networking.

[0010] The antennas of the on-board terminal equipment on the train are of two types: an internal directional antenna and an external omnidirectional antenna.

[0011] Generally speaking, on-board terminal equipment using in-vehicle directional antennas is installed at the front and rear of the train, usually in the cabs at both ends of the train. The vertical plane of the in-vehicle directional antenna is required to be wide and the horizontal plane is required to be narrow. Considering the small installation space in the cab, it is recommended that the antenna width, length and height should not exceed 250mm. In this installation method, the penetration loss of the train needs to be considered, which is generally 6 to 15dB.

[0012] Taking into account safety considerations such as wind resistance, the external omnidirectional antenna of the vehicle generally adopts a shark fin antenna. In order to maximize the multiple input multiple output (MIMO) multi-stream effect, polarization isolation and spatial isolation can be generated by changing the antenna installation method. The antenna gain of the external omnidirectional antenna is generally 6dB to 8dB.

[0013] These two antenna networking methods for trains each have their own disadvantages, because when the on-board terminal equipment uses the omnidirectional antenna outside the vehicle, the peak rate of the space-time interface is often lower than that of the directional antenna inside the vehicle; and when the on-board terminal equipment uses the directional antenna inside the vehicle in the case of large penetration loss, the average and minimum values ​​of the space-time interface are lower than those of the omnidirectional antenna outside the vehicle. Summary of the invention

[0014] In view of this, the main purpose of the present application is to provide a communication method and device that can take into account the peak rate, average value and minimum value of the air interface of the vehicle-mounted terminal equipment as much as possible.

[0015] In a first aspect, an embodiment of the present application provides a communication method, which is applicable to a system including a base station and a vehicle-mounted terminal device, wherein two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, and the method comprises the following steps:

[0016] After the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets the set conditions, the base station determines beam information for the vehicle-mounted terminal equipment that meets the set conditions;

[0017] The base station sends the beam information to the vehicle-mounted terminal device that meets the set conditions.

[0018] Optionally, the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets a set condition, including:

[0019] The base station determines that the vehicle-mounted terminal equipment under the base station that can support at least two beams includes a vehicle-mounted terminal equipment belonging to the same vehicle;

[0020] The base station determines beam information for the vehicle-mounted terminal device that meets the set conditions, including:

[0021] The base station determines the beam information for the vehicle-mounted terminal equipment belonging to the same vehicle, wherein the beam information includes an indication of a wide beam, wherein the vehicle-mounted terminal equipment of different vehicles under the base station is set to use a narrow beam.

[0022] Optionally, the method further comprises:

[0023] The base station determines that the vehicle-mounted terminal device exiting the base station has a vehicle-mounted terminal device in the same vehicle under the base station;

[0024] The base station determines beam information for the vehicle-mounted terminal device in the same vehicle, and the beam information includes an indication of a narrow beam.

[0025] Optionally, the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets a set condition, including:

[0026] The base station determines that there is a vehicle-mounted terminal device belonging to the same vehicle according to the identification of the vehicle-mounted terminal device accessed or switched to the base station and the corresponding relationship between the identifications of the vehicle-mounted terminal devices in the same vehicle.

[0027] Optionally, the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets a set condition, including:

[0028] After the first vehicle-mounted terminal device accesses the base station, or during or after switching to the base station, the base station determines that a second vehicle-mounted terminal device is connected or switched within t1 time before the first vehicle-mounted terminal device is connected / switched, and the first vehicle-mounted terminal device and the second vehicle-mounted terminal device belong to vehicle-mounted terminal devices of the same vehicle.

[0029] Optionally, the t1 is a set value, or a value determined according to the length and moving speed of the high-speed moving device.

[0030] Optionally, the base station sending the beam information includes:

[0031] The base station sends the beam information through an uplink scheduling frame;

[0032] Alternatively, the beam information is sent through a trigger frame corresponding to the Basic Delay type, and a reserved field in the User Info field of the trigger frame is used to indicate the beam type, or a bit map field in the Trigger Dependent User Info field of the User Info field is used to indicate the beam type.

[0033] Optionally, the area of ​​the base station includes four intervals along the running direction of the high-speed mobile device, which include X1, X2, X3 and X4 in sequence; the high-speed mobile device includes a third vehicle-mounted terminal device and a fourth vehicle-mounted terminal device;

[0034] After the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets the set conditions, the base station determines beam information for the vehicle-mounted terminal equipment that meets the set conditions, including:

[0035] When the base station determines that the third vehicle-mounted terminal device is at X1, determining that the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam;

[0036] When the base station determines that the third vehicle-mounted terminal device is at X2, the third vehicle-mounted terminal device uses a wide beam, and the fourth vehicle-mounted terminal device uses a narrow beam;

[0037] When the base station determines that the third vehicle-mounted terminal device is at X3, it determines that the third vehicle-mounted terminal device uses a narrow beam and the fourth vehicle-mounted terminal device uses a wide beam;

[0038] When the base station determines that the third vehicle-mounted terminal device is at X4, it determines that the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam.

[0039] Optionally, the starting position of X2 is: when the fourth vehicle-mounted terminal device uses a narrow beam, the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a wide beam and the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a narrow beam corresponding to the intersection point, or the position adjusted according to the position;

[0040] The end position of X2 is: the position point where the signal strength of the third vehicle-mounted terminal equipment is closest to that of the fourth vehicle-mounted terminal equipment.

[0041] Optionally, after the base station determines beam information for a vehicle-mounted terminal device belonging to the same vehicle, the method further includes:

[0042] The base station performs uplink / downlink power control on the vehicle-mounted terminal equipment using a wide beam.

[0043] Optionally, the area of ​​the base station includes three intervals along the running direction of the high-speed mobile device, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3; the high-speed mobile device includes a fifth vehicle-mounted terminal device and a sixth vehicle-mounted terminal device;

[0044] After the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets the set conditions, the base station determines beam information for the vehicle-mounted terminal equipment that meets the set conditions, including:

[0045] When the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are at Y1, the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam;

[0046] When the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are at Y2, the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a narrow beam;

[0047] When the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are at Y3, it determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam.

[0048] Optionally, Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

[0049] Optionally, before the determining step, the base station further includes:

[0050] The base station obtains the beam capability information of the vehicle-mounted terminal device according to the capability information reported by the vehicle-mounted terminal device, and / or determines that the vehicle-mounted terminal device has the conditions for beam switching according to the notification message reported by the vehicle-mounted terminal device.

[0051] In a second aspect, an embodiment of the present application provides another communication method, applicable to a system including a first base station and a first vehicle-mounted terminal device capable of supporting at least two beams, wherein two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, and the method comprises the following steps:

[0052] The first vehicle-mounted terminal device reports the beam capability information of the first vehicle-mounted terminal device to the first base station, and / or, when the first vehicle-mounted terminal device determines that the first vehicle-mounted terminal device has the beam switching condition, reports a notification message to the first base station that the first vehicle-mounted terminal device has the beam switching condition;

[0053] The first vehicle-mounted terminal device receives beam information from the first base station;

[0054] The first vehicle-mounted terminal device determines the beam to be used based on the beam information.

[0055] Optionally, the first vehicle-mounted terminal device receives beam information from the first base station, including:

[0056] The first terminal device receives the beam information through an uplink scheduling frame;

[0057] Alternatively, the beam information is received through a trigger frame corresponding to the Basic Delay type, and a reserved field in the User Info field of the trigger frame is used to indicate the beam type, or a bit map field in the Trigger Dependent User Info field of the User Info field is used to indicate the beam type.

[0058] Optionally, the first vehicle-mounted terminal device sequentially passes through X1-X4 of the area where the base station is located, the left side of the base station includes two intervals X1 and X2, and the right side includes two intervals X3 and X4, and the high-speed mobile device includes a first vehicle-mounted terminal device and a second vehicle-mounted terminal device;

[0059] The starting position of X2 is: when the second vehicle-mounted terminal device uses a narrow beam, the position corresponding to the intersection of the SINR change curve of the second vehicle-mounted terminal device when the first vehicle-mounted terminal device uses a wide beam and the SINR change curve of the second vehicle-mounted terminal device when the first vehicle-mounted terminal device uses a narrow beam, or the position adjusted according to the position;

[0060] The end position of X2 is: the position point where the signal strength of the first vehicle-mounted terminal device is closest to that of the second vehicle-mounted terminal device.

[0061] Optionally, the first vehicle-mounted terminal device sequentially passes through X1-X3 of the area where the base station is located, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3;

[0062] Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

[0063] Optionally, the first vehicle-mounted terminal device reports a notification message to the first base station that the first vehicle-mounted terminal device meets the beam switching condition, including:

[0064] The first vehicle-mounted terminal device sends an HT Control to the first base station, and indicates through the Control ID of the HT Control that the first vehicle-mounted terminal device meets the beam switching condition.

[0065] Optionally, the first vehicle-mounted terminal device determines that the first vehicle-mounted terminal device meets the beam switching condition, including:

[0066] The first vehicle-mounted terminal device determines that the target SNR can be achieved by using a wide beam, and the first vehicle-mounted terminal device currently uses a directional antenna to send / receive signals.

[0067] Optionally, the method further comprises:

[0068] The first vehicle-mounted terminal device uses a narrow beam to access the base station, and uses a wide beam to measure the base station and / or adjacent base stations.

[0069] Optionally, the method further comprises:

[0070] When the first vehicle-mounted terminal device determines that the inter-cell switching condition is met, it reports a message that the first vehicle-mounted terminal device needs to switch through the high capacity control field HT Control field in the MAC frame format.

[0071] In a third aspect, an embodiment of the present application provides a base station, the base station belongs to a system including a vehicle-mounted terminal device, two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, and the base station includes:

[0072] A processing unit, configured to determine beam information for the vehicle-mounted terminal device that meets the set conditions after determining that the vehicle-mounted terminal device that can support at least two beams under the base station has a vehicle-mounted terminal device that meets the set conditions;

[0073] The transceiver unit is used to send the beam information determined by the processing unit to the vehicle-mounted terminal device that meets the set conditions.

[0074] Optionally, the processing unit is used to determine that the vehicle-mounted terminal devices under the base station that can support at least two beams include vehicle-mounted terminal devices belonging to the same vehicle, and to determine the beam information for the vehicle-mounted terminal devices belonging to the same vehicle, the beam information including an indication of a wide beam, wherein the vehicle-mounted terminal devices of different vehicles under the base station are set to use a narrow beam.

[0075] Optionally, the processing unit is further used to determine that the vehicle-mounted terminal device that exits the base station has a vehicle-mounted terminal device in the same vehicle under the base station, and to determine beam information for the vehicle-mounted terminal device in the same vehicle, wherein the beam information includes an indication of a narrow beam.

[0076] Optionally, the processing unit is used to determine that there is a vehicle-mounted terminal device belonging to the same vehicle based on the identification of the vehicle-mounted terminal device that accesses or switches to the base station and the corresponding relationship between the identifications of the vehicle-mounted terminal devices in the same vehicle.

[0077] Optionally, the processing unit is used to determine, after the first vehicle-mounted terminal device accesses the base station, or during or after switching to the base station, that a second vehicle-mounted terminal device is connected or switched within time t1 before the first vehicle-mounted terminal device is connected / switched, and the first vehicle-mounted terminal device and the second vehicle-mounted terminal device belong to vehicle-mounted terminal devices of the same vehicle.

[0078] Optionally, the t1 is a set value, or a value determined according to the length and moving speed of the high-speed moving device.

[0079] Optionally, the transceiver unit is used to send the beam information through an uplink scheduling frame; or send the beam information through a trigger frame corresponding to the BasicDelay type, and the reserved field in the User Info field of the trigger frame is used to indicate the beam type, or the bit map field in the Trigger Dependent User Info field of the User Info field is used to indicate the beam type.

[0080] Optionally, the area of ​​the base station includes four sections along the running direction of the high-speed mobile device, the left side of the base station includes two sections X1 and X2, and the right side includes two sections X3 and X4; the high-speed mobile device includes a third vehicle-mounted terminal device and a fourth vehicle-mounted terminal device;

[0081] The processing unit is used to determine that when it is determined that the third vehicle-mounted terminal device is at X1, the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam; when it is determined that the third vehicle-mounted terminal device is at X2, the third vehicle-mounted terminal device uses a wide beam, and the fourth vehicle-mounted terminal device uses a narrow beam; when it is determined that the third vehicle-mounted terminal device is at X3, the third vehicle-mounted terminal device uses a narrow beam, and the fourth vehicle-mounted terminal device uses a wide beam; and when it is determined that the third vehicle-mounted terminal device is at X4, the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam.

[0082] Optionally, the starting position of X2 is: when the fourth vehicle-mounted terminal device uses a narrow beam, the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a wide beam and the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a narrow beam corresponding to the intersection point, or the position adjusted according to the position;

[0083] The end position of X2 is: the position point where the signal strength of the third vehicle-mounted terminal equipment is closest to that of the fourth vehicle-mounted terminal equipment.

[0084] Optionally, the processing unit is further used to perform uplink / downlink power control on a vehicle-mounted terminal device using a wide beam.

[0085] Optionally, the area of ​​the base station includes three intervals along the running direction of the high-speed mobile device, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3; the high-speed mobile device includes a fifth vehicle-mounted terminal device and a sixth vehicle-mounted terminal device;

[0086] The processing unit is used to determine that when the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are determined to be in Y1, the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam; when the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are determined to be in Y2, the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a narrow beam; and when the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are determined to be in Y3, the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam.

[0087] Optionally, Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

[0088] Optionally, the transceiver unit is further used to receive capability information of the vehicle-mounted terminal device from the vehicle-mounted terminal device, and / or receive a notification message from the vehicle-mounted terminal device;

[0089] The processing unit is further used to obtain beam capability information of the vehicle-mounted terminal device according to the capability information, and / or determine whether the vehicle-mounted terminal device has the conditions for beam switching according to the communication message.

[0090] The embodiment of the present application provides a vehicle-mounted terminal device, which is applicable to a system including a base station and a vehicle-mounted terminal device capable of supporting at least two beams, wherein two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, and the vehicle-mounted terminal device includes:

[0091] A processing unit, used to determine the beam capability information of the vehicle-mounted terminal device, and / or, when determining that the vehicle-mounted terminal device meets the beam switching condition, generate a communication message for reporting that the vehicle-mounted terminal device meets the beam switching condition;

[0092] a transceiver unit, configured to report the beam capability information and / or the notification message to a first base station, and receive beam information from the first base station;

[0093] The processing unit is further configured to determine a beam to be used according to the beam information.

[0094] Optionally, the transceiver unit is used to receive the beam information through an uplink scheduling frame; or, to receive the beam information through a trigger frame corresponding to the BasicDelay type, and the reserved field in the User Info field of the trigger frame is used to indicate the beam type, or the bit map field in the Trigger Dependent User Info field of the User Info field is used to indicate the beam type.

[0095] Optionally, the vehicle-mounted terminal device sequentially passes through X1-X4 of the area where the base station is located, the left side of the base station includes two sections X1 and X2, and the right side includes two sections X3 and X4, the high-speed mobile device includes a first vehicle-mounted terminal device and a second vehicle-mounted terminal device, and the vehicle-mounted terminal device is the first vehicle-mounted terminal device;

[0096] The starting position of X2 is: when the second vehicle-mounted terminal device uses a narrow beam, the position corresponding to the intersection of the SINR change curve of the second vehicle-mounted terminal device when the first vehicle-mounted terminal device uses a wide beam and the SINR change curve of the second vehicle-mounted terminal device when the second vehicle-mounted terminal device uses a narrow beam, or the position adjusted according to the position;

[0097] The end position of X2 is: the position point where the signal strength of the first vehicle-mounted terminal device is closest to that of the second vehicle-mounted terminal device.

[0098] Optionally, the first vehicle-mounted terminal device sequentially passes through X1-X3 of the area where the base station is located, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3;

[0099] Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

[0100] Optionally, the transceiver unit is specifically used to send an HT Control to the first base station, and indicate through the Control ID of the HTControl that the first vehicle-mounted terminal device meets the beam switching condition.

[0101] Optionally, the processing unit is used to determine that the vehicle-mounted terminal device has beam switching conditions after determining that the target SNR can be achieved by using a wide beam and the first vehicle-mounted terminal device currently uses a directional antenna to send / receive signals.

[0102] Optionally, the processing unit further accesses the base station using a narrow beam through the transceiver unit, and measures the base station and / or adjacent base stations using a wide beam.

[0103] Optionally, the processing unit is used to report a MAC frame through the transceiver unit when determining that the inter-cell switching condition is met, and the high-capacity control field HT Control field in the MAC frame format carries a message that the vehicle-mounted terminal device needs to be switched.

[0104] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the method described in the first or second aspect above.

[0105] In a sixth aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method described in the first or second aspect above.

[0106] In the seventh aspect, an embodiment of the present application provides a communication device, which may include entities such as a base station or a vehicle-mounted terminal device, and the communication device includes: a processor and a memory; the memory is used to store instructions; the processor is used to execute the instructions in the memory, so that the communication device executes a method as described in any one of the first or second aspects above.

[0107] In an eighth aspect, the present application provides a chip system, which includes a processor for supporting a communication device to implement the functions involved in the above aspects, for example, sending or processing the data and / or information involved in the above methods. In one possible design, the chip system also includes a memory, which is used to store program instructions and data necessary for the communication device. The chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0108] In a ninth aspect, the present application provides a wireless communication system, which includes a base station and a vehicle-mounted terminal device capable of supporting at least two beams, the access point performs the processing of the first aspect above, and the station with beamforming capability performs the processing of the second aspect above.

[0109] Through the above embodiments, the base station can determine which beam is better for the vehicle-mounted terminal equipment according to the situation of the vehicle-mounted terminal equipment, and indicate the beam to the vehicle-mounted terminal equipment, thereby taking into account the peak rate, mean and minimum value of the air interface of the vehicle-mounted terminal equipment as much as possible.

[0110] In one implementation, the base station can set the vehicle-mounted terminal devices of the same vehicle to a wide beam, which can improve the throughput rate, and because the base station can perform frequency division scheduling on these vehicle-mounted terminal devices, interference between these vehicle-mounted terminal devices can be avoided as much as possible. The vehicle-mounted terminal devices of the oncoming vehicles are set to a narrow beam, so that the vehicle-mounted terminal devices of each oncoming vehicle can fully utilize the bandwidth in the oncoming section, and the total throughput rate of these oncoming vehicle-mounted terminal devices can be improved as much as possible. In addition, the use of narrow beams by the vehicle-mounted terminal devices of each oncoming vehicle can also reduce the interference between these oncoming vehicle-mounted terminal devices.

[0111] In another implementation, the base station may also determine the beam type for the vehicle-mounted terminal device according to the situation of the vehicle-mounted terminal device in each area, so as to minimize the interference between the vehicle-mounted terminal devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0112] Figure 1 This is a flowchart of an embodiment of the present application;

[0113] Figure 2 A message flow diagram of an embodiment of the present application;

[0114] Figure 3 A schematic diagram of the relationship between an AP and a train in an embodiment of the present application;

[0115] Figure 4 A schematic diagram of the structure of a base station in an embodiment of the present application;

[0116] Figure 5 This is a schematic diagram of the structure of the vehicle-mounted terminal device according to an embodiment of the present application;

[0117] Figure 6 A schematic diagram of the uplink SNR variation trend of an omnidirectional antenna user according to an embodiment of the present application;

[0118] Figure 7 This is a schematic diagram of horizontal projection of the user movement at the front of the vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0119] Before introducing the implementation scheme of the present application, relevant data of the existing antenna networking method is first introduced.

[0120] Take the system bandwidth of 80MHz and the inter-station spacing of 500m on the base station side as an example. Directional antennas are usually used on the base station side. If the train uses omnidirectional antennas for networking, the two onboard terminal devices on the train share the 80MHz bandwidth. When the train runs to a cell radius of 250 meters, the vehicle throughput is the lowest. If the train uses directional antennas for networking, the two onboard terminal devices on the train can access two cells, and each user can use 80MHz bandwidth. When the train runs to a cell radius of 500 meters, the vehicle throughput is the lowest.

[0121] According to the unlicensed spectrum regulations, assuming that the equivalent isotropic radiated power (EIRP) cannot be greater than 33dBm, the throughput analysis results of the train are shown in Table B under the given parameters shown in Table A.

[0122]

[0123] Table A

[0124]

[0125] Table B

[0126] It can be seen from Table B that the peak value of the in-vehicle directional antenna network in the prior art is higher than that of the external omnidirectional antenna, but when the penetration loss of the train is greater than 6dB, the mean and minimum values ​​of the in-vehicle directional antenna network are lower than those of the external omnidirectional antenna.

[0127] In an embodiment of the present application, the vehicle-mounted terminal device on the high-speed mobile device is provided with two sets of antennas. The high-speed mobile device may be a high-speed mobile device such as a train or subway with a long body that requires installation of at least two vehicle-mounted terminal devices. The following embodiments take trains as an example. One of the two sets of antennas provided in the vehicle-mounted terminal device is a directional antenna and the other is an omnidirectional antenna, and two beams are determined, one is a narrow beam corresponding to a directional antenna; the other is a wide beam corresponding to an omnidirectional antenna. Different antennas are selected according to different situations. The vehicle-mounted terminal devices on the train usually include two or more. The vehicle-mounted terminal device can be set inside the train. If two are set, they can be set at the front and rear of the train. Of course, other settings can also be made as needed, such as setting the vehicle-mounted terminal device outside the train, and / or setting more than two vehicle-mounted terminal devices.

[0128] The base station in the embodiment of the present application may be a common base station or an access point. The vehicle-mounted terminal device may be a device that can be set in a high-speed mobile device, and the high-speed mobile device exchanges information with the base station through the vehicle-mounted terminal device, and the vehicle-mounted terminal device may be provided with two sets of antennas to exchange information with the base station.

[0129] The embodiment of the present application may include the following steps:

[0130] Step I: The base station determines whether there is a vehicle-mounted terminal device that meets the set conditions among the vehicle-mounted terminal devices under the base station that can support at least two beams.

[0131] Step II: The base station determines beam information for the vehicle-mounted terminal device that meets the set conditions.

[0132] Step III: The base station sends the beam information to the vehicle-mounted terminal device that meets the set conditions.

[0133] Through the above steps, the base station can determine which beam is better for the vehicle-mounted terminal device according to the situation of the vehicle-mounted terminal device, and indicate the beam to the vehicle-mounted terminal device.

[0134] In the above steps, the set conditions in step I may include whether there is a vehicle-mounted terminal device belonging to a vehicle-mounted terminal device in the same vehicle, and may also include whether there is a vehicle-mounted terminal device in a set interval.

[0135] The implementation solutions corresponding to these two conditions are described in detail below.

[0136] If the set conditions include whether there is a vehicle-mounted terminal device in the same vehicle, the implementation of this application is as follows: Figure 1 As shown, the following steps may be included.

[0137] Step 101: The base station determines whether the vehicle-mounted terminal device under the base station has a vehicle-mounted terminal device belonging to the same vehicle.

[0138] The vehicle-mounted terminal device may support two or more beams at the same time, or may only support one beam. Therefore, if this is the case, the base station may first determine whether the vehicle-mounted terminal device supports two or more beams before executing step 101. If so, step 101 is executed; otherwise, this step does not need to be executed for the vehicle-mounted terminal device. The embodiment of the present application takes supporting two beams as an example.

[0139] If the vehicle-mounted terminal equipment supports both beams at the same time, a narrow beam can be used by default when accessing a base station, that is, a directional antenna is used.

[0140] Before step 101, the vehicle-mounted terminal device may send information to the base station. The sent information may be access information of accessing a source base station. The source base station may perform step 101 according to the information.

[0141] The vehicle-mounted terminal device may also send neighboring cell measurement information to the source base station. When a handover is required, the source base station sends handover-related information to the target base station, and the handover-related information may include the vehicle-mounted terminal device information. Thus, the target base station may perform the processing of step 101 according to the vehicle-mounted terminal device information.

[0142] The vehicle-mounted terminal device can also report the beam capability information of the vehicle-mounted terminal device to the base station. Specifically, it can be reported when reporting the capability information. For example, the reserved field in the capability information field can be used for reporting, such as using the B6 field for reporting. The capability information can be reported when the vehicle-mounted terminal device is connected, or it can be reported during the switching process.

[0143] The determination can be made when each vehicle-mounted terminal device accesses the base station, that is, whether there is a vehicle-mounted terminal device in the same vehicle as the newly accessed vehicle-mounted terminal device under the base station. The determination can also be made when each vehicle-mounted terminal device switches to the base station. These two determination methods are similar.

[0144] There are many ways to determine whether there is a vehicle-mounted terminal device in the same vehicle. For example, the base station can save the corresponding relationship between the identifiers of the vehicle-mounted terminal devices in the same vehicle, and then use the vehicle-mounted terminal device identifiers to make a judgment.

[0145] Since the two vehicle-mounted terminal devices in the same train are usually installed at the front and rear of the train, when the train is traveling in one direction, if the vehicle-mounted terminal device at the front is connected to a certain base station, the vehicle-mounted terminal device at the rear will also be connected to the base station after a certain period of time. Accordingly, another implementation method provided by the embodiment of the present application is as follows.

[0146] After the vehicle-mounted terminal device 1 is connected, during the process of switching to the base station, or after the switching, the base station determines whether other vehicle-mounted terminal devices are connected or switched to this base station within the time t1 before the vehicle-mounted terminal device 1 is connected / switched. If yes, it means that a vehicle-mounted terminal device in the same vehicle has been connected before, and the vehicle-mounted terminal device that has been connected before is the vehicle-mounted terminal device in the same vehicle as the vehicle-mounted terminal device 1. Otherwise, it means that no vehicle-mounted terminal device in the same vehicle is connected, and at this time, it can be considered that the other vehicle-mounted terminal devices under the base station are all on-board terminal devices of the on-board terminal device 1.

[0147] The time length of t1 can be a set value; it can also be a value determined according to the body length and the moving speed of the train. For example, a value can be directly calculated according to the body length and the moving speed of the train, and a floating value can be floated up or down based on the calculated value. The floating value can be related to the train sending interval, that is, the value of t1 needs to be able to distinguish between the on-board terminal devices on two trains traveling in the same direction.

[0148] The determination may also be made when each vehicle-mounted terminal device exits the base station. The exit may include the vehicle-mounted terminal device going offline or switching to another base station.

[0149] For the judgment of the vehicle-mounted terminal device that exits the base station, it can be determined whether there is a vehicle-mounted terminal device in the same vehicle as the exited vehicle-mounted terminal device based on the correspondence between the identification of the exited vehicle-mounted terminal device and the identification of the vehicle-mounted terminal device in the same vehicle. Take vehicle-mounted terminal devices a, b and c as an example for description. It can be determined whether there is a vehicle-mounted terminal device in the same vehicle as the vehicle-mounted terminal device a before the vehicle-mounted terminal device a exits. If there is, for example, it is vehicle-mounted terminal device b, and after the vehicle-mounted terminal device a exits, there is no other vehicle-mounted terminal device in the same vehicle as the vehicle-mounted terminal device b, then the vehicle-mounted terminal device b needs to be set to a narrow beam. If after the vehicle-mounted terminal device a exits, there is still a vehicle-mounted terminal device c in the same vehicle as b, then neither b nor c needs to be adjusted.

[0150] Step 102: If the base station has a vehicle-mounted terminal device in the same vehicle, all the vehicle-mounted terminal devices in the same vehicle are set to wide beam.

[0151] If step 101 is to make a judgment when each vehicle-mounted terminal device accesses the base station, the base station will set the accessed vehicle-mounted terminal device and other vehicle-mounted terminal devices in the same vehicle as the accessed vehicle-mounted terminal device as wide beams in step 102.

[0152] If there is no vehicle-mounted terminal device in the same vehicle, all vehicle-mounted terminal devices use narrow beams. If each vehicle-mounted terminal device uses a narrow beam by default when accessing the base station, the base station does not need to send beam information. If necessary, the base station can send beam information including narrow beam indication information to the vehicle-mounted terminal device. For example, the vehicle-mounted terminal device that is accessed may have used a wide beam before, and it needs to switch to a narrow beam.

[0153] For beam information, the base station may send it through an uplink scheduling frame, and the beam information may include a beam type.

[0154] The base station may also send beam information in other ways. When the beam information is of beam type, it may be sent using a 1-bit field. Specifically, it may be sent using a reserved field in the user info field in the trigger frame corresponding to the basic delay type, such as the B39 field. The trigger frame is shown in Table 1 below, and the user info is shown in Table 2 below.

[0155] In addition to using the reserved fields in the User Info domain to indicate, the trigger dependent user information (trigger dependent user info) field in the User Info domain can also be used to indicate. There are multiple fields in the trigger dependent userinfo field, which can be indicated using a 1-bit field. For example, trigger dependent user info is shown in Table 3 below, including a bit map field occupying B0-B3 bits, and one of the bits can be set to indicate beam information. For example, a 1-bit field is used in the bit map field to indicate the beam type, so that the vehicle-mounted terminal device can determine the beam to be used by the device through the indicated beam type, that is, determine whether beam switching is required.

[0156]

[0157] Table 1

[0158]

[0159] Table 2

[0160]

[0161] Table 3

[0162] The connected vehicle-mounted terminal device and other vehicle-mounted terminal devices may have previously used narrow beams, and thus need to be switched to wide beams in step 102. Therefore, this step 102 also involves beam switching of the vehicle-mounted terminal device.

[0163] Since the interference of wide beam, that is, omnidirectional antenna, may be serious, the base station can use uplink / downlink power control for vehicle-mounted terminal devices using wide beam to avoid interference as much as possible.

[0164] Step 103: The base station sends beam information to a vehicle-mounted terminal device in the same vehicle, where the beam information includes information for indicating a wide beam.

[0165] Through the above embodiments, the base station can set the vehicle-mounted terminal devices of the same vehicle to a wide beam, which can improve the throughput rate, and because the base station can perform frequency division scheduling on these vehicle-mounted terminal devices, interference between these vehicle-mounted terminal devices can be avoided as much as possible. The vehicle-mounted terminal devices of the oncoming vehicles are set to a narrow beam, so that the vehicle-mounted terminal devices of each oncoming vehicle can fully utilize the bandwidth in the oncoming section, and the total throughput rate of these oncoming vehicle-mounted terminal devices can be improved as much as possible. In addition, the use of narrow beams by the vehicle-mounted terminal devices of each oncoming vehicle can also reduce the interference between these oncoming vehicle-mounted terminal devices.

[0166] It should be noted that the various embodiments of the present application use beams as an example to perform various determinations and other processing, and can also be processed according to antenna types, such as directional antennas, omnidirectional antennas, etc. Accordingly, the base station sends information about the antenna type to the vehicle-mounted terminal device, for example, 1 bit can be used to indicate the antenna type.

[0167] A message flow diagram of the above embodiment is as follows: Figure 2 This diagram mainly involves how each base station sets the beam for the vehicle-mounted terminal device when the vehicle-mounted terminal device switches between different base stations, such as AP. Figure 1 A subordinate embodiment of the illustrated embodiment.

[0168] like Figure 2 As shown in the figure, by default, the vehicle-mounted terminal devices at the front and rear of the vehicle use directional antennas, i.e. narrow beams, to access AP2 and AP1 respectively. Then, omnidirectional antennas, i.e. wide beams, are used to measure the signal quality of the local cell and neighboring cells.

[0169] If the neighboring cell measurement of the vehicle-mounted terminal device at the rear of the vehicle triggers the inter-AP switching of the vehicle-mounted terminal device, AP1 and AP2 exchange relevant information, and AP1 instructs the vehicle-mounted terminal device at the rear of the vehicle to switch cells, and the target switching cell is AP2; at the same time, AP2 instructs the vehicle-mounted terminal device at the front of the vehicle to use a wide beam, and the vehicle-mounted terminal device at the rear of the vehicle also uses a wide beam after accessing AP2. This situation corresponds to the situation where the target AP, that is, AP2, has a vehicle-mounted terminal device in the same vehicle.

[0170] If the neighboring cell measurement of the vehicle-mounted terminal device at the front of the vehicle triggers the inter-AP switching of the vehicle-mounted terminal device, AP2 and AP3 exchange relevant information, and AP2 instructs the vehicle-mounted terminal device at the front of the vehicle to switch cells, and the target switching cell is AP3; at the same time, AP2 instructs the vehicle-mounted terminal device at the rear of the vehicle to use a narrow beam, and the vehicle-mounted terminal device at the front of the vehicle also uses a narrow beam after accessing AP3. This situation corresponds to the target AP, that is, AP3, and there is no vehicle-mounted terminal device in the same vehicle.

[0171] In addition, in this embodiment, each vehicle-mounted terminal device can use a narrow beam when accessing the base station; when performing downlink service cell and neighboring cell signal quality measurement, a wide beam, that is, an omnidirectional antenna, can be used. Because the measurement is in the downlink direction, using a wide beam for the measurement will not cause additional interference.

[0172] The above-mentioned measurement can be that the vehicle-mounted terminal device uses an omnidirectional antenna to measure the cell signal quality. When the vehicle-mounted terminal device determines that the target SNR can be achieved by using an omnidirectional antenna and currently uses a directional antenna for transmission / reception, the vehicle-mounted terminal device notifies the base station that the vehicle-mounted terminal device is ready to switch to an omnidirectional antenna. Accordingly, the AP can combine the vehicle-mounted terminal device-side report and the theoretical analysis results to comprehensively determine when to switch the antenna form.

[0173] The terminal can notify the AP that the terminal has the conditions to switch to the omnidirectional antenna through the high throughput control field (HT Control field) in the media access control (MAC) frame format. The MAC frame format is shown in Table 4. The specific format of the HT Control field is as follows. The settings of the HT Controlfield are shown in Table 5. The structure of a control subfield in the HT Control field is shown in Table 6, including a control ID and control information. The values ​​7-14 of the control ID are reserved values. In this embodiment, one of the values ​​can be used to identify the conditions for switching to the omnidirectional antenna. Correspondingly, the length of the Control Information can be 0 bits. One value is 14, which represents the conditions for switching to the omnidirectional antenna.

[0174]

[0175] Table 4

[0176]

[0177] Table 5

[0178]

[0179] Table 6

[0180] Another scheme for setting conditions is described below. It should be noted that the various embodiments of the present application are related, and some processing and settings of the previous embodiments can be used in this embodiment, which will not be repeated in this embodiment.

[0181] For the case where the distances between base stations that the train needs to access along the route are roughly the same, multiple intervals can also be set for each base station. Each base station determines whether the on-board terminal device uses a wide beam or a narrow beam based on the interval where the on-board terminal device is currently located, and instructs the on-board terminal device.

[0182] For example, Figure 3 As shown, the four sections include X1, X2, X3 and X4 from left to right. X2 can be equal to X3. X1 can also be equal to X4. The train includes two onboard terminal devices, onboard terminal device 1 and onboard terminal device 2. The onboard terminal device 1 is located at the front of the train, and the onboard terminal device 2 is located at the rear of the train.

[0183] When AP1 determines that the vehicle-mounted terminal device 1 is at X1, it determines that both the vehicle-mounted terminal devices 1 and 2 use narrow beams.

[0184] When AP1 determines that vehicle-mounted terminal device 1 is at X2, it determines that vehicle-mounted terminal device 1 uses a wide beam and vehicle-mounted terminal device 2 uses a narrow beam. Furthermore, the power of vehicle-mounted terminal device 1 can be controlled by a power control algorithm to reduce the interference of the omnidirectional antenna of vehicle-mounted terminal device 1 on the directional antenna at the rear of the vehicle.

[0185] When AP1 determines that vehicle-mounted terminal device 1 is at X3, it determines that vehicle-mounted terminal device 1 uses a narrow beam and vehicle-mounted terminal device 2 uses a wide beam. Furthermore, the power of vehicle-mounted terminal device 2 can be controlled by a power control algorithm to reduce the interference of the omnidirectional antenna of vehicle-mounted terminal device 2 with the directional antenna at the rear of the vehicle.

[0186] When AP1 determines that the vehicle-mounted terminal device 1 is at X4, it determines that both the vehicle-mounted terminal devices 1 and 2 use narrow beams.

[0187] The above embodiment makes a judgment based on the position of the vehicle-mounted terminal device at the front of the vehicle. The present application can also make a judgment based on the position of the vehicle-mounted terminal device at the rear of the vehicle.

[0188] The antenna supporting two beams in the embodiment of the present application is called a smart antenna. Through this solution, the throughput effect achieved is shown in Table 7 below:

[0189]

[0190]

[0191] Table 7

[0192] Another implementation is:

[0193] When AP1 determines that the vehicle-mounted terminal devices 1 and 2 are at X1, it instructs the vehicle-mounted terminal devices 1 and 2 to use a wide beam.

[0194] When AP1 determines that the vehicle-mounted terminal devices 1 and 2 are at X2 and / or X3, AP1 instructs the vehicle-mounted terminal devices 1 and 2 to use narrow beams.

[0195] When AP1 determines that the vehicle-mounted terminal devices 1 and 2 are at X4, it instructs the vehicle-mounted terminal devices 1 and 2 to use a wide beam.

[0196] This solution can be used when there is no EIRP restriction, in which case both the base station and the vehicle-mounted terminal device can transmit at the maximum transmit power of the device.

[0197] It can also be divided into three intervals, namely Y1, Y2 and Y3, where Y2 corresponds to X2+X3.

[0198] One advantage of this implementation is that the on-board terminal devices on the train switch antenna forms at the same time to avoid mutual interference.

[0199] Through this solution, the throughput effect achieved is shown in Table 8 below:

[0200]

[0201] Table 8

[0202] For the above intervals X1, X2, X3 and X4, since X2 and X3 can be equal, the station spacing between access points can be set, and the location of the access points can also be set. Therefore, by determining the starting position and the ending position of X2, the four intervals can be determined.

[0203] For the setting of the starting position of X2, the signal noise ratio (SNR) / signal to interference plus noise ratio (SINR) change curve of the vehicle-mounted terminal device 2 when the vehicle-mounted terminal device 1 located at the front of the vehicle uses a directional antenna and the vehicle-mounted terminal device 2 located at the rear of the vehicle uses a directional antenna, and the SNR / SINR change curve of the vehicle-mounted terminal device 2 when the vehicle-mounted terminal device 1 uses an omnidirectional antenna, and the position corresponding to the intersection of the two curves is used as the starting position of X2. Of course, this position can also be adjusted appropriately as needed.

[0204] The setting of the end position of X2 can be determined based on the signal strength of the vehicle-mounted terminal devices at the front and rear of the vehicle at each position. For example, the position where the signal strength of the two vehicle-mounted terminal devices is closest is determined. At this position, the signal-to-noise ratio of the two vehicle-mounted terminal devices is the largest, so this position is used as the end position of X2. Figure 6 As shown, the end position of X2 in this embodiment is 300 meters.

[0205] After determining the starting position and the ending position of X2, the four intervals of the AP1 can be determined. For example, starting from the left side of the AP, the starting position of X1 is a set starting point, the starting position of X2 is the ending position of X1, the ending position of X2 is the starting position of X3, the ending position of X3 is the sum of the distance between the ending position of X2 and X2, the starting position of X4 is the ending position of X3, and the distance between the ending position of X4 and the starting position of X1 is a set distance, such as the station spacing. Of course, each position can also be adjusted appropriately as needed. Optionally, the starting position of X1 is at half the station spacing.

[0206] For example, if the inter-station distance is 500 meters, the X2 boundary can be set to [200, 300] meters, the X3 boundary can be set to [300, 400] meters, and accordingly, the X1 boundary can be set to [0, 200] meters, and the X4 boundary can be set to [400, 500] meters.

[0207] When the system parameters change, for example, the inter-station distance is 300 meters and the access point is at 200 meters, the X2 boundary may be [120, 200] meters, the X3 boundary may be [200, 280] meters, and accordingly, the X1 boundary is [0, 120] meters and the X4 boundary is [280, 300] meters.

[0208] Another possibility is that the X2 boundary can be set to [200, 250] meters, and the X3 boundary can be set to [250, 300] meters. Correspondingly, the X1 boundary is set to [0, 200] meters, and the X4 boundary is set to [300, 500] meters. In this example, the distance of X2 is equal to that of X3, and the distance of X1 is equal to that of X2.

[0209] For the interference problem at X2, calculate the change of SNR when the vehicle-mounted terminal device 1 uses an omnidirectional antenna, and determine that the vehicle-mounted terminal device 1 reaches the target SNR at point P1. P1 is within X1, or at the starting position of X2. Starting from point P1, while ensuring that the SNR of the vehicle-mounted terminal device 1 is greater than or equal to the target SNR, perform power control on the vehicle-mounted terminal device 1. This reduces the interference of the vehicle-mounted terminal device 1 using a wide beam to the vehicle-mounted terminal device 2 in X2. The interference problem of X3 is similar. Point P2 in X3 can be determined with reference to point P1. For example, the position of the station spacing - P1 is used as point P2, and the power of the vehicle-mounted terminal device 2 is controlled in X3 until point P2, thereby reducing the interference of the vehicle-mounted terminal device 2 using a wide beam to the vehicle-mounted terminal device 1 in X3.

[0210] The above X2 and X3 can also be combined into one interval, namely Y1, Y2 and Y3. One possible method is to determine by the following steps. This method can be used when there is no EIRP restriction.

[0211] Step a) calculating the total throughput of the on-board terminal equipment on the train at each point along the line in the case of an omnidirectional antenna, and obtaining a first total throughput curve;

[0212] Step b) uses the same method as step a) to calculate the total throughput of the on-board terminal equipment on the train at each point along the line in the case of directional antennas to obtain a second total throughput curve;

[0213] Step c) compares the obtained total throughputs, and uses the antenna shape corresponding to the portion with higher throughput in the two curves as the antenna shape for the interval corresponding to the portion. Alternatively, use the beam type corresponding to the portion with higher throughput in the two curves as the beam type for the interval corresponding to the portion.

[0214] For example, assuming that the station spacing is 500 meters, the directional antenna glass penetration loss is 15dB, the left interval of the access point is set to [0, 300] meters, and the right interval is set to [300, 500]. Figure 7 It can be seen that when the front user is located in the interval of [250, 350] meters, the use of omnidirectional antennas and directional antennas in other areas can significantly improve the minimum throughput. That is, the interval of X2 is [250, 300], the interval of X3 is [300, 350], and if it is Y2, the interval of Y2 is [250, 350].

[0215] By calculating the throughput, the embodiment of the present application shows that the embodiment of the present application can better take into account the peak rate, average value and minimum value of the air interface compared with the prior art. The throughput can be determined in the following way.

[0216] Step A: Determine the receiving power of each point along the base station.

[0217] Specifically, the path loss value of each point along the base station can be obtained based on the station spacing between each AP, the working frequency and the path loss model; the receiving power of each point can be calculated by combining the transmission power and antenna gain.

[0218] This solution provides a path loss model of 20lgf(MHz)+30lgd(m)-28(dB)).

[0219] Step B: Determine the receiver sensitivity corresponding to each order of MCS.

[0220] Specifically, the system thermal noise under different bandwidths can be determined according to the receiver noise factor NF (assuming 5dB); the receiver sensitivity corresponding to each order of MCS can be obtained according to the demodulation threshold SNR corresponding to each order of MCS under different mobile speeds.

[0221] This solution provides a method for calculating the system thermal noise: noise = -174 + 10 * log10 (BW) + NF

[0222] Step C: Compare the received power of each point in step A with the receiver sensitivity at the corresponding position in step 302 to obtain the MCS level.

[0223] Step D: Determine the throughput rate according to the MCS level.

[0224] The structure of the base station in the embodiment of the present application is as follows Figure 4 As shown, it includes a transceiver unit 401 and a processing unit 402.

[0225] Specifically, the processing unit 402 is used to determine beam information for the vehicle-mounted terminal devices that meet the set conditions after determining that the vehicle-mounted terminal devices that can support at least two beams under the base station have vehicle-mounted terminal devices that meet the set conditions.

[0226] The transceiver unit 401 is used to send the beam information determined by the processing unit to the vehicle-mounted terminal device that meets the set conditions.

[0227] In the above method embodiment, the base station's processing related to sending and receiving can be performed by the above transceiver unit 401, and other processing can be performed by the processing unit 402. The setting of each information can also refer to the method embodiment. No further details will be given here.

[0228] The structure of the vehicle-mounted terminal device in the embodiment of the present application is as follows Figure 5 As shown, it includes a transceiver unit 501 and a processing unit 502.

[0229] The processing unit 502 is used to determine the beam capability information of the vehicle-mounted terminal device, and / or, when determining that the vehicle-mounted terminal device meets the beam switching conditions, generate a communication message for reporting that the vehicle-mounted terminal device meets the beam switching conditions.

[0230] The transceiver unit 501 is used to report the beam capability information and / or the notification message to the first base station, and receive beam information from the first base station.

[0231] The processing unit 502 is further configured to determine a beam to be used according to the beam information.

[0232] In the above method embodiment, the vehicle-mounted terminal device may be executed by the above transceiver unit 701 for the processing related to sending and receiving, and other processing may be executed by the processing unit 702. The setting of each information may also refer to the method embodiment. No further description is given here.

[0233] The transceiver units of the above-mentioned base station and vehicle-mounted terminal equipment may specifically be transceivers, and the processing unit may be a processor.

[0234] The above-mentioned transceiver unit and processing unit may be arranged in a chip, that is, each processing step of the above-mentioned method embodiment is implemented by the chip.

[0235] The above-mentioned processor can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the wireless communication method of the first aspect.

[0236] The base station and the vehicle-mounted terminal device may further include a storage unit, which may be a memory for storing computer executable program code. The program code includes instructions. When the instructions are executed, the processor executes the processing steps in the above method embodiment.

[0237] For the base station, an embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a program, and the program executes part or all of the processing steps involving the access point recorded in the above method embodiment.

[0238] For the vehicle-mounted terminal device, an embodiment of the present application also provides another computer storage medium, wherein the computer storage medium stores a program that executes part or all of the processing steps involving the site recorded in the above method embodiment.

[0239] It should also be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0240] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0241] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0242] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: Applicable to a system including a base station and a vehicle-mounted terminal device, wherein two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, the method comprising the following steps: After the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets the set conditions, the base station determines beam information for the vehicle-mounted terminal equipment that meets the set conditions; The base station sends the beam information to the vehicle-mounted terminal device that meets the set conditions; Before the determining step, the base station further comprises: The base station obtains the beam capability information of the vehicle-mounted terminal device according to the capability information reported by the vehicle-mounted terminal device, and / or determines that the vehicle-mounted terminal device has the conditions for beam switching according to the notification message reported by the vehicle-mounted terminal device.

2. The method according to claim 1, characterized in that The base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets the set conditions, including: The base station determines that the vehicle-mounted terminal equipment under the base station that can support at least two beams includes a vehicle-mounted terminal equipment belonging to the same vehicle; The base station determines beam information for the vehicle-mounted terminal device that meets the set conditions, including: The base station determines the beam information for the vehicle-mounted terminal equipment belonging to the same vehicle, wherein the beam information includes an indication of a wide beam, wherein the vehicle-mounted terminal equipment of different vehicles under the base station is set to use a narrow beam.

3. The method according to claim 2, characterized in that The method further comprises: The base station determines that the vehicle-mounted terminal device exiting the base station has a vehicle-mounted terminal device in the same vehicle under the base station; The base station determines beam information for the vehicle-mounted terminal device in the same vehicle, and the beam information includes an indication of a narrow beam.

4. The method according to claim 2 or 3, characterized in that: The base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets a set condition, including: The base station determines that there is a vehicle-mounted terminal device belonging to the same vehicle according to the identification of the vehicle-mounted terminal device accessed or switched to the base station and the corresponding relationship between the identifications of the vehicle-mounted terminal devices in the same vehicle.

5. The method according to claim 2 or 3, characterized in that: The base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets a set condition, including: After the first vehicle-mounted terminal device accesses the base station, or during or after switching to the base station, the base station determines that a second vehicle-mounted terminal device is connected or switched within t1 time before the first vehicle-mounted terminal device is connected / switched, and the first vehicle-mounted terminal device and the second vehicle-mounted terminal device belong to vehicle-mounted terminal devices of the same vehicle.

6. The method according to claim 5, characterized in that The t1 is a set value, or a value determined according to the length and moving speed of the high-speed moving device.

7. The method according to any one of claims 1 to 3, characterized in that: The base station sending the beam information includes: The base station sends the beam information through an uplink scheduling frame; Alternatively, the beam information is sent through a trigger frame corresponding to the Basic Delay type, and a reserved field in the User Info field of the triggerframe is used to indicate the beam type, or a bit map field in the TriggerDependent User Info field of the User Info field is used to indicate the beam type.

8. The method according to claim 1, characterized in that: The area of ​​the base station includes four sections along the running direction of the high-speed mobile device, including X1, X2, X3 and X4 in sequence; the high-speed mobile device includes a third vehicle-mounted terminal device and a fourth vehicle-mounted terminal device; After the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets the set conditions, the base station determines beam information for the vehicle-mounted terminal equipment that meets the set conditions, including: When the base station determines that the third vehicle-mounted terminal device is at X1, determining that the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam; When the base station determines that the third vehicle-mounted terminal device is at X2, the third vehicle-mounted terminal device uses a wide beam, and the fourth vehicle-mounted terminal device uses a narrow beam; When the base station determines that the third vehicle-mounted terminal device is at X3, it determines that the third vehicle-mounted terminal device uses a narrow beam and the fourth vehicle-mounted terminal device uses a wide beam; When the base station determines that the third vehicle-mounted terminal device is at X4, it determines that the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam.

9. The method according to claim 8, characterized in that The starting position of X2 is: when the fourth vehicle-mounted terminal device uses a narrow beam, the position corresponding to the intersection of the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a wide beam and the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a narrow beam, or the position adjusted according to the position; The end position of X2 is: the position point where the signal strength of the third vehicle-mounted terminal equipment is closest to that of the fourth vehicle-mounted terminal equipment.

10. The method according to claim 2 or 3 or 8 or 9, characterized in that: After the base station determines beam information for the vehicle-mounted terminal device belonging to the same vehicle, the method further includes: The base station performs uplink / downlink power control on the vehicle-mounted terminal equipment using a wide beam.

11. The method according to claim 1, characterized in that: The area of ​​the base station includes three sections along the running direction of the high-speed mobile device, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3; the high-speed mobile device includes a fifth vehicle-mounted terminal device and a sixth vehicle-mounted terminal device; After the base station determines that the vehicle-mounted terminal equipment capable of supporting at least two beams under the base station has a vehicle-mounted terminal equipment that meets the set conditions, the base station determines beam information for the vehicle-mounted terminal equipment that meets the set conditions, including: When the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are at Y1, the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam; When the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are at Y2, the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a narrow beam; When the base station determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are at Y3, it determines that the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam.

12. The method according to claim 11, characterized in that Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

13. A communication method, characterized in that: Applicable to a system including a base station and a first vehicle-mounted terminal device capable of supporting at least two beams, wherein two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, the method comprising the following steps: The first vehicle-mounted terminal device reports the beam capability information of the first vehicle-mounted terminal device to the base station, and / or, when the first vehicle-mounted terminal device determines that the first vehicle-mounted terminal device has the beam switching condition, reports a notification message to the base station that the first vehicle-mounted terminal device has the beam switching condition; The first vehicle-mounted terminal device receives beam information from the base station; The first vehicle-mounted terminal device determines the beam to be used based on the beam information.

14. The method according to claim 13, characterized in that The first vehicle-mounted terminal device receives beam information from the base station, including: The first vehicle-mounted terminal device receives the beam information via an uplink scheduling frame; Alternatively, the beam information is received through a trigger frame corresponding to the Basic Delay type, and a reserved field in the User Info field of the triggerframe is used to indicate the beam type, or a bit map field in the TriggerDependent User Info field of the User Info field is used to indicate the beam type.

15. The method according to claim 13 or 14, characterized in that The first vehicle-mounted terminal device sequentially passes through X1-X4 in the area where the base station is located, the left side of the base station includes two sections X1 and X2, and the right side includes two sections X3 and X4, and the high-speed mobile device includes a first vehicle-mounted terminal device and a second vehicle-mounted terminal device; The starting position of X2 is: when the second vehicle-mounted terminal device uses a narrow beam, the position corresponding to the intersection of the SINR change curve of the second vehicle-mounted terminal device when the first vehicle-mounted terminal device uses a wide beam and the SINR change curve of the second vehicle-mounted terminal device when the first vehicle-mounted terminal device uses a narrow beam, or the position adjusted according to the position; The end position of X2 is: the position point where the signal strength of the first vehicle-mounted terminal device is closest to that of the second vehicle-mounted terminal device.

16. The method according to claim 13 or 14, characterized in that The first vehicle-mounted terminal device sequentially passes through X1-X3 of the area where the base station is located, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3; Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

17. The method according to claim 13 or 14, characterized in that The first vehicle-mounted terminal device reports a notification message to the base station that the first vehicle-mounted terminal device meets the beam switching condition, including: The first vehicle-mounted terminal device sends an HT Control to the base station, and indicates through the ControlID of the HT Control that the first vehicle-mounted terminal device meets the beam switching condition.

18. The method according to claim 13 or 14, characterized in that The first vehicle-mounted terminal device determines that the first vehicle-mounted terminal device meets the beam switching condition, including: The first vehicle-mounted terminal device determines that the target SNR can be achieved by using a wide beam, and the first vehicle-mounted terminal device currently uses a directional antenna to send / receive signals.

19. The method according to claim 13 or 14, characterized in that The method further comprises: The first vehicle-mounted terminal device uses a narrow beam to access the base station, and uses a wide beam to measure the base station and / or adjacent base stations.

20. The method according to claim 13 or 14, characterized in that The method further comprises: When the first vehicle-mounted terminal device determines that the inter-cell switching condition is met, it reports a message that the first vehicle-mounted terminal device needs to switch through the high capacity control field HT Control field in the MAC frame format.

21. A base station, characterized in that: The base station belongs to a system including a vehicle-mounted terminal device, two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, and the base station includes: A processing unit, configured to determine beam information for the vehicle-mounted terminal device that meets the set conditions after determining that the vehicle-mounted terminal device that can support at least two beams under the base station has a vehicle-mounted terminal device that meets the set conditions; A transceiver unit, used to send the beam information determined by the processing unit to the vehicle-mounted terminal device that meets the set conditions; The transceiver unit is further used to receive capability information of the vehicle-mounted terminal device from the vehicle-mounted terminal device, and / or receive a notification message from the vehicle-mounted terminal device; The processing unit is further used to obtain beam capability information of the vehicle-mounted terminal device according to the capability information, and / or determine whether the vehicle-mounted terminal device has the conditions for beam switching according to the notification message.

22. The base station according to claim 21, characterized in that The processing unit is used to determine that the vehicle-mounted terminal devices under the base station that can support at least two beams include vehicle-mounted terminal devices belonging to the same vehicle, and to determine the beam information for the vehicle-mounted terminal devices belonging to the same vehicle, wherein the beam information includes an indication of a wide beam, wherein the vehicle-mounted terminal devices of different vehicles under the base station are set to use a narrow beam.

23. The base station according to claim 22, characterized in that The processing unit is further used to determine that the vehicle-mounted terminal device exiting the base station has a vehicle-mounted terminal device in the same vehicle under the base station, and to determine beam information for the vehicle-mounted terminal device in the same vehicle, wherein the beam information includes an indication of a narrow beam.

24. The base station according to claim 22 or 23, characterized in that: The processing unit is used to determine that there is a vehicle-mounted terminal device belonging to the same vehicle according to the identification of the vehicle-mounted terminal device accessed or switched to the base station and the corresponding relationship between the identifications of the vehicle-mounted terminal devices in the same vehicle.

25. The base station according to claim 22 or 23, characterized in that: The processing unit is used to determine, after the first vehicle-mounted terminal device accesses the base station, or during or after switching to the base station, that a second vehicle-mounted terminal device is connected or switched within t1 time before the first vehicle-mounted terminal device is connected / switched, and the first vehicle-mounted terminal device and the second vehicle-mounted terminal device belong to vehicle-mounted terminal devices of the same vehicle.

26. The base station according to claim 25, characterized in that The t1 is a set value, or a value determined according to the length and moving speed of the high-speed moving device.

27. The base station according to any one of claims 21 to 23, characterized in that: The transceiver unit is used to send the beam information through an uplink scheduling frame; or send the beam information through a trigger frame corresponding to the Basic Delay type, and the reserved field in the User Info field of the trigger frame is used to indicate the beam type, or the bitmap field in the Trigger Dependent User Info field of the User Info field is used to indicate the beam type.

28. The base station according to claim 21, characterized in that The area of ​​the base station includes four sections along the running direction of the high-speed mobile device, the left side of the base station includes two sections X1 and X2, and the right side includes two sections X3 and X4; the high-speed mobile device includes a third vehicle-mounted terminal device and a fourth vehicle-mounted terminal device; The processing unit is used to determine that when it is determined that the third vehicle-mounted terminal device is at X1, the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam; when it is determined that the third vehicle-mounted terminal device is at X2, the third vehicle-mounted terminal device uses a wide beam, and the fourth vehicle-mounted terminal device uses a narrow beam; when it is determined that the third vehicle-mounted terminal device is at X3, the third vehicle-mounted terminal device uses a narrow beam, and the fourth vehicle-mounted terminal device uses a wide beam; and when it is determined that the third vehicle-mounted terminal device is at X4, the third vehicle-mounted terminal device and the fourth vehicle-mounted terminal device use a narrow beam.

29. The base station according to claim 28, characterized in that The starting position of X2 is: when the fourth vehicle-mounted terminal device uses a narrow beam, the position corresponding to the intersection of the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a wide beam and the SINR change curve of the fourth vehicle-mounted terminal device when the third vehicle-mounted terminal device uses a narrow beam, or the position adjusted according to the position; The end position of X2 is: the position point where the signal strength of the third vehicle-mounted terminal equipment is closest to that of the fourth vehicle-mounted terminal equipment.

30. The base station according to claim 22 or 23 or 28 or 29, characterized in that: The processing unit is further used to perform uplink / downlink power control on a vehicle-mounted terminal device using a wide beam.

31. The base station according to claim 21, characterized in that The area of ​​the base station includes three sections along the running direction of the high-speed mobile device, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3; the high-speed mobile device includes a fifth vehicle-mounted terminal device and a sixth vehicle-mounted terminal device; The processing unit is used to determine that when the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are determined to be in Y1, the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam; when the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are determined to be in Y2, the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a narrow beam; and when the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device are determined to be in Y3, the fifth vehicle-mounted terminal device and the sixth vehicle-mounted terminal device use a wide beam.

32. The base station according to claim 31, characterized in that Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

33. A vehicle-mounted terminal device, characterized in that: Applicable to a system including a base station and a vehicle-mounted terminal device capable of supporting at least two beams, wherein two or more vehicle-mounted terminal devices in the system are arranged on the same high-speed mobile device, and the vehicle-mounted terminal device includes: A processing unit, used to determine the beam capability information of the vehicle-mounted terminal device, and / or, when determining that the vehicle-mounted terminal device has the beam switching condition, generate a notification message for reporting that the vehicle-mounted terminal device has the beam switching condition; a transceiver unit, configured to report the beam capability information and / or the notification message to a base station, and receive beam information from the base station; The processing unit is further configured to determine a beam to be used according to the beam information.

34. The vehicle-mounted terminal device according to claim 33, characterized in that: The transceiver unit is used to receive the beam information through an uplink scheduling frame; or, to receive the beam information through a trigger frame corresponding to the Basic Delay type, and the reserved field in the User Info field of the trigger frame is used to indicate the beam type, or the bitmap field in the Trigger Dependent User Info field of the User Info field is used to indicate the beam type.

35. The vehicle-mounted terminal device according to claim 33 or 34, characterized in that: The vehicle-mounted terminal device sequentially passes through X1-X4 in the area where the base station is located, the left side of the base station includes two sections X1 and X2, and the right side includes two sections X3 and X4, the high-speed mobile device includes a first vehicle-mounted terminal device and a second vehicle-mounted terminal device, and the vehicle-mounted terminal device is the first vehicle-mounted terminal device; The starting position of X2 is: when the second vehicle-mounted terminal device uses a narrow beam, the position corresponding to the intersection of the SINR change curve of the second vehicle-mounted terminal device when the first vehicle-mounted terminal device uses a wide beam and the SINR change curve of the second vehicle-mounted terminal device when the second vehicle-mounted terminal device uses a narrow beam, or the position adjusted according to the position; The end position of X2 is: the position point where the signal strength of the first vehicle-mounted terminal device is closest to that of the second vehicle-mounted terminal device.

36. The vehicle-mounted terminal device according to claim 33 or 34, characterized in that: The vehicle-mounted terminal device sequentially passes through X1-X3 of the area where the base station is located, the left side of the base station includes Y1, the right side includes Y3, and Y2 is between Y1 and Y3. The high-speed mobile device includes a first vehicle-mounted terminal device and a second vehicle-mounted terminal device, and the vehicle-mounted terminal device is the first vehicle-mounted terminal device; Y1, Y2 and Y3 correspond to the following position intervals: the position interval corresponding to the high throughput part between the first total throughput curve of the vehicle-mounted terminal equipment when set to a wide beam and the second total throughput curve of the vehicle-mounted terminal equipment when set to a narrow beam.

37. The vehicle-mounted terminal device according to claim 35, characterized in that: The transceiver unit is specifically used to send HT Control to the base station, and indicates through the ControlID of the HT Control that the first vehicle-mounted terminal device meets the beam switching condition.

38. The vehicle-mounted terminal device according to claim 35, characterized in that: The processing unit is used to determine that the vehicle-mounted terminal device has beam switching conditions after determining that the target SNR can be achieved by using a wide beam and the first vehicle-mounted terminal device currently uses a directional antenna to send / receive signals.

39. The vehicle-mounted terminal device according to claim 33 or 34, characterized in that: The processing unit further uses a narrow beam to access the base station through the transceiver unit, and uses a wide beam to measure the base station and / or adjacent base stations.

40. The vehicle-mounted terminal device according to claim 33 or 34, characterized in that: The processing unit is used to report a MAC frame through the transceiver unit when it is determined that the inter-cell switching condition is met, and the high capacity control field HT Control field in the MAC frame format carries the message that the vehicle-mounted terminal device needs to be switched.

41. A computer storage medium, characterized in that Computer instructions are stored thereon, and when the computer instructions are executed, the computer is caused to execute the method according to any one of claims 1 to 20.

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