CN111586619A

CN111586619A - Communication method and device under multiple network systems

Info

Publication number: CN111586619A
Application number: CN201910117572.0A
Authority: CN
Inventors: 张伟; 夏金环; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2020-08-25
Also published as: WO2020164388A1

Abstract

The embodiment of the application discloses a communication method and device under multiple network systems. In the method, when a terminal device determines that the network state of the terminal device changes, the terminal device generates and transmits sidelink state information according to the state of a sidelink air interface before the network state changes; after acquiring the sidelink status information, the first base station judges whether the first base station can support the status of a sidelink air interface after the network status changes or not based on the sidelink status information, and if the first base station cannot support the status, the first base station generates indication information and transmits the indication information; after receiving the indication information, the terminal device adjusts the state of the air interface of the sidelink through the adjustment mode indicated by the indication information, so that the terminal device can communicate through the adjusted air interface of the sidelink after the network state changes, and the problem of communication interruption between the terminal devices is avoided.

Description

Communication method and device under multiple network systems

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus in multiple network systems.

Background

With the development of wireless communication technology, wireless communication systems have experienced a variety of network systems, such as a 2G network system represented by a global system for mobile communication (GSM), a 3G network system represented by Wideband Code Division Multiple Access (WCDMA), and a 4G network system represented by Long Term Evolution (LTE) which is currently widely used worldwide, and a 5G network system represented by new radio communication (NR) has also appeared. Meanwhile, services supported by wireless communication systems have also been developed from initial voice transmission and short message transmission to support wireless high-speed data communication. Accordingly, various new types of wireless services, such as the internet of vehicles, are also emerging in large numbers.

In the car networking, vehicle-to-infrastructure/vehicle/pedestrian (V2X) technology is usually adopted to implement communication between a terminal device (i.e., a vehicle with communication capability in the car networking) and the terminal device, and between the terminal device and a base station, so as to improve the safety and intelligence of a traffic system. The V2X technology defines two air interfaces, one is a terrestrial radio access network and user equipment (UTRAN UE, Uu) air interface for implementing communication between a terminal device and a base station, and the other is a Sidelink air interface (i.e., Sidelink air interface) for implementing communication between different terminal devices. Further, the V2X technology further defines two modes for allocating time-frequency resources to the terminal device, where in one mode, the base station dynamically schedules the time-frequency resources of the terminal device on the air interface of the sidelink in real time, and in the other mode, the base station pre-configures a time-frequency resource pool of the terminal device on the air interface of the sidelink, and the time-frequency resources used by each terminal device in the time-frequency resource pool are negotiated and determined by each terminal device. When the terminal devices communicate with each other through the V2X technology, the terminal devices determine the time-frequency resources on the air interface of the sidelink through one of the modes, and then implement communication through the time-frequency resources.

However, in the research process of the present application, the inventors found that, there is usually a difference in the communication functions of the sidelink air interfaces supported by different network systems, that is, when a terminal device communicates through the sidelink air interfaces in different network systems, the adopted modes may be different, and in this case, when the network state of the terminal device changes, for example, when the terminal device moves from the coverage of a base station of one network system to the coverage of a base station of another network system, and thus cell handover occurs, communication between the terminal devices is often interrupted due to the difference.

Disclosure of Invention

When a terminal device performs communication in multiple network systems according to the prior art, communication between terminal devices may be interrupted due to differences in communication functions of sidelink air interfaces supported by different network systems. In order to solve the problem, an embodiment of the present application discloses a communication method in a multi-network system and a corresponding device.

In a first aspect, an embodiment of the present application discloses a communication method in multiple network systems, including:

when the network state of a terminal device changes, the terminal device generates sidelink state information according to the state of a sidelink air interface before the network state changes, wherein the network state changes comprise: the network type of the service cell of the terminal device is changed, and/or the terminal device is changed from the network-camping state to the network-camping state;

the terminal device transmitting the sidelink status information to a first base station;

the terminal device receives indication information corresponding to the sidelink status information from the first base station, wherein the indication information is used for indicating an adjustment mode;

and the terminal device adjusts the state of the air interface of the sidelink according to the adjusting mode, so that the terminal device communicates through the adjusted air interface of the sidelink.

According to the scheme disclosed by the embodiment of the application, if the network state of the terminal device changes, the terminal device can adjust the state of the air interface of the sidelink, so that the adjusted air interface of the sidelink can communicate through the adjusted air interface of the sidelink after the network state changes, and the problem of communication interruption between the terminal devices is avoided

In an optional design, when the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from new radio communication NR to long term evolution LTE, the sidelink status information includes: the side link air interface is in a time frequency resource allocation mode, a data transmission mode and a function state before cell switching;

the time frequency resource allocation mode comprises a first mode and a second mode, wherein the first mode is dynamic scheduling of a base station, and the second mode is used for determining self-applicable time frequency resources in a time frequency resource pool for the terminal device;

the data transmission mode comprises the following steps: unicast, multicast and broadcast;

the functional states include: whether to activate a retransmission mechanism and/or a channel state feedback mechanism.

In an alternative design, the method further comprises:

the terminal device determines whether a time-frequency resource allocation mode of the side link air interface is a first mode;

when the time-frequency resource allocation mode is the first mode, the terminal device determines whether the current data transmission mode of the side link air interface is unicast or multicast;

when the current data transmission mode of the air interface of the side link is unicast or multicast, the terminal device determines whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism;

when at least one of the retransmission mechanism and the channel state feedback mechanism is activated, the terminal device generates the sidelink state information according to the state of the sidelink air interface before the network state changes.

In an optional design, when the adjustment mode is to adjust the time-frequency resource allocation mode of the sidelink air interface, the adjusting, by the terminal device, the state of the sidelink air interface according to the adjustment mode includes:

the terminal device determines a time-frequency resource pool included in the indication information;

the terminal device determines self-applicable time frequency resources in the time frequency resource pool so as to communicate through the self-applicable time frequency resources in the time frequency resource pool;

wherein a sending time-frequency resource in the time-frequency resource pool is in a first sending time-frequency resource, a receiving time-frequency resource in the time-frequency resource pool is the same as a first receiving time-frequency resource, the first sending time-frequency resource is a sending time-frequency resource of the air interface of the side link before adjustment, and the first receiving time-frequency resource is a receiving time-frequency resource of the air interface of the side link before adjustment.

Through the adjustment, the state of the air interface of the sidelink can be adjusted to the state which can be supported by the first base station. Further, the adjustment can keep the retransmission mechanism and/or the channel state feedback mechanism in an activated state, so that the reliability of communication between the terminal devices can be guaranteed.

In an optional design, the sidelink status information further includes the first transmitting time-frequency resource and the first receiving time-frequency resource;

or, the first sending time-frequency resource and the first receiving time-frequency resource are transmitted to the first base station by a second base station.

In an optional design, when the adjustment mode is to adjust a data transmission mode of the air interface of the sidelink, the adjusting, by the terminal device, a state of the air interface of the sidelink according to the adjustment mode includes:

the terminal device adjusts the data transmission mode of the air interface of the side link into a broadcast mode;

the terminal device generates a scheduling request comprising required time frequency resources according to the transmission requirement of the side link air interface;

the terminal device transmitting the scheduling request to the first base station;

and the terminal device determines the time-frequency resource allocated by the first base station according to the scheduling request so as to carry out communication in a broadcasting mode according to the time-frequency resource.

Through the adjustment, the eNB can support the state after the air interface of the sidelink is adjusted, so that the communication between the terminal devices is ensured to be continued. And through the adjustment mode, the time frequency resource of the air interface of the sidelink is dynamically scheduled by the first base station, so that the conflict between the time frequency resource of the air interface of the sidelink and the time frequency resource applied by the first base station can be avoided, and the communication quality is ensured.

In an optional design, when the adjustment mode is to adjust the functional state of the air interface of the sidelink, the adjusting, by the terminal device, the state of the air interface of the sidelink according to the adjustment mode includes:

the terminal device adjusts a retransmission mechanism and a channel state feedback mechanism to be in a closed state;

and the terminal device determines the time-frequency resource allocated by the first base station according to the scheduling request so as to carry out communication according to the time-frequency resource.

Through the adjustment, the eNB can support the state after the air interface of the sidelink is adjusted, so that the communication between the terminal devices is ensured to be continued. Furthermore, through the adjustment mode, the air interface of the side link communicates with other terminal devices in a unicast or multicast mode, and the receiving end can be guaranteed to receive data in a targeted manner.

In an alternative design, the method further comprises:

when the terminal device is changed from the non-network-residing state to the network-residing state, the terminal device determines whether a time-frequency resource allocation mode of the side-link air interface is that the terminal device determines self-applicable time-frequency resources in a time-frequency resource pool;

and when the time frequency resource allocation mode of the air interface of the side link determines self-applicable time frequency resources in a time frequency resource pool for the terminal device, the terminal device regenerates the state information of the side link.

In this case, the base station in which the terminal device resides can determine, based on the sidelink status information, whether a time-frequency resource pool applied when the terminal device is in a non-network-residing state conflicts with a time-frequency resource pool allocated by the base station in which the terminal device resides, and/or determine whether the time-frequency resource pool applied when the terminal device is in the non-network-residing state conflicts with a time-frequency resource applied by the base station in which the terminal device resides, and accordingly determine whether the status of an air interface of a sidelink needs to be adjusted.

In an alternative design, the sidelink status information includes at least: and the time frequency resource pool of the side link air interface in the non-network-residing state.

In an alternative design, the method further comprises:

the terminal device transmits a measurement report to a second base station.

In a second aspect, an embodiment of the present application discloses a communication method in multiple network systems, including:

a first base station receiving side link state information of a terminal device;

the first base station determines whether the first base station supports the current state of a sidelink air interface of the terminal device according to the sidelink state information;

when the current state of a sidelink air interface of the terminal device is not supported, the first base station generates indication information, wherein the indication information is used for indicating an adjustment mode;

the first base station transmits the indication information to the terminal device.

According to the scheme disclosed by the embodiment of the application, if the network state of the terminal device changes, the terminal device can adjust the state of the air interface of the side link, so that the adjusted air interface of the side link can communicate through the adjusted air interface of the side link after the network state changes, and the problem of communication interruption between the terminal devices is avoided.

In an optional design, when the network type of the serving cell of the terminal apparatus changes and the network type of the serving cell changes from new radio communication NR to long term evolution LTE, the determining, by the first base station, whether or not to support a current state of a sidelink air interface of the terminal apparatus according to the sidelink state information includes:

the first base station determines whether the current time frequency resource allocation mode of the air interface of the side link is base station dynamic scheduling according to the time frequency resource allocation mode included in the side link state information;

when the current time-frequency resource allocation mode of the air interface of the side link is the dynamic scheduling of the base station, the first base station determines whether the current data transmission mode of the air interface of the side link is unicast or multicast according to the data transmission mode included in the state information of the side link;

when the current data transmission mode of the air interface of the sidelink is unicast or multicast, the first base station determines whether the terminal device activates at least one of a retransmission mechanism and a channel state feedback mechanism according to a functional state included in the sidelink state information;

when the terminal device activates a retransmission mechanism and/or a channel state feedback mechanism, the first base station determines that the first base station does not support the current state of a sidelink air interface of the terminal device.

In an alternative design, when the network type of the serving cell of the terminal device changes, and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE,

the adjustment mode is to adjust a time-frequency resource allocation mode of the air interface of the sidelink, and the indication information includes a time-frequency resource pool, a sending time-frequency resource in the time-frequency resource pool is in a first sending time-frequency resource, a receiving time-frequency resource in the time-frequency resource pool is the same as a first receiving time-frequency resource, the first sending time-frequency resource is the sending time-frequency resource of the air interface of the sidelink before adjustment, and the first receiving time-frequency resource is the receiving time-frequency resource of the air interface of the sidelink before adjustment;

or, the adjusting mode is to adjust a data transmission mode of the air interface of the sidelink;

or, the adjustment mode is to adjust a functional state of the air interface of the sidelink.

In an optional design, when the first base station is a long term evolution base station eNB, the determining, by the first base station according to the sidelink status information, whether the first base station supports a current status of a sidelink air interface of the terminal apparatus includes:

when the terminal device is camped to the first base station, the first base station determines whether a time-frequency resource pool of the side link air interface included in the side link state information when the side link air interface is in a non-camped state conflicts with a time-frequency resource pool allocated for the terminal device by the first base station and/or conflicts with time-frequency resources applied by the first base station;

and when the first base station determines that the time frequency resource pool conflicts with a time frequency resource pool allocated for the terminal device by the first base station and/or conflicts with time frequency resources applied by the first base station, the first base station determines that the first base station does not support the current state of a side link air interface of the terminal device.

In an alternative design, the transmitting, by the first base station, the indication information includes:

when the terminal device is switched from the cell of the second base station to the cell of the first base station, the first base station transmits the indication information to the second base station, so that the second base station forwards the indication information to the terminal device.

In a third aspect, an embodiment of the present application discloses a communication method in multiple network systems, including:

the second base station receiving a measurement report of the terminal device;

the second base station determines whether the network standard of the service cell of the terminal device changes or not according to the measurement report;

when the network system of the serving cell of the terminal device changes, the second base station generates sidelink state information according to the state of a sidelink air interface of the terminal device before cell switching;

the second base station transmitting the sidelink status information to the first base station;

the second base station receives indication information corresponding to the side link state information from the first base station, wherein the indication information is used for indicating an adjustment mode;

the second base station transmits the indication information to the terminal device.

In an optional design, when the network format of the serving cell is changed from new radio communication NR to long term evolution LTE, the sidelink status information includes: the side link air interface is in a time frequency resource allocation mode, a data transmission mode and a function state before cell switching;

In an alternative design, the method further comprises:

the second base station determines whether the time-frequency resource allocation mode of the air interface of the side link is a first mode;

when the time-frequency resource allocation mode is the first mode, the second base station determines whether the current data transmission mode of the air interface of the sidelink is unicast or multicast;

when the current data transmission mode of the air interface of the side link is unicast or multicast, the second base station determines whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism;

and when at least one of a retransmission mechanism and a channel state feedback mechanism is activated, the second base station generates the sidelink state information according to the state of the sidelink air interface before cell switching.

In a fourth aspect, an embodiment of the present application discloses a terminal apparatus, including:

a processor, configured to generate sidelink status information according to a status of a sidelink air interface before a network status changes when the network status of the terminal device changes, where the change in the network status includes: the network type of the service cell of the terminal device is changed, and/or the terminal device is changed from the network-camping state to the network-camping state;

a transmitter for transmitting the sidelink status information to a first base station;

a receiver, configured to receive, from the first base station, indication information corresponding to the sidelink status information, where the indication information is used to indicate an adjustment manner;

the processor is further configured to adjust a state of the air interface of the sidelink according to the adjustment manner, so that the terminal device performs communication through the adjusted air interface of the sidelink.

In an optional design, the processor is further configured to determine whether a time-frequency resource allocation mode of the sidelink air interface is a first mode;

when the time-frequency resource allocation mode is the first mode, the processor is further configured to determine whether a current data transmission mode of the sidelink air interface is unicast or multicast;

when the current data transmission mode of the air interface of the side link is unicast or multicast, the processor is further configured to determine whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism;

when at least one of the retransmission mechanism and the channel state feedback mechanism is activated, the processor generates the sidelink state information according to the state of the sidelink air interface before the network state changes.

In an optional design, when the adjustment mode is to adjust a time-frequency resource allocation mode of the air interface of the sidelink, the processor is specifically configured to determine a time-frequency resource pool included in the indication information, and determine self-applicable time-frequency resources in the time-frequency resource pool, so as to perform communication through the self-applicable time-frequency resources in the time-frequency resource pool;

or, the first sending time-frequency resource and the first receiving time-frequency resource are transmitted to the first base station by the second base station.

In an optional design, when the adjustment mode is to adjust the data transmission mode of the sidelink air interface, the processor is specifically configured to adjust the data transmission mode of the sidelink air interface to a broadcast mode, generate a scheduling request including a required time-frequency resource according to a transmission requirement of the sidelink air interface, transmit the scheduling request to the first base station, and determine the time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication in a broadcast mode according to the time-frequency resource.

In an optional design, when the adjustment mode is to adjust the functional state of the air interface of the sidelink, the processor is specifically configured to adjust a retransmission mechanism and a channel state feedback mechanism to an off state, generate a scheduling request including a required time-frequency resource according to a transmission requirement of the air interface of the sidelink, transmit the scheduling request to the first base station, and determine the time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication according to the time-frequency resource.

In an optional design, when the terminal device changes from the non-network-camping state to the network-camping state, the processor is further configured to determine whether a time-frequency resource allocation mode of the sidelink air interface is a time-frequency resource that can be applied to the terminal device in a time-frequency resource pool;

and when the time frequency resource allocation mode of the air interface of the side link determines self-applicable time frequency resources in a time frequency resource pool for the terminal device, the processor generates the state information of the side link.

In an alternative design, the transmitter is further configured to transmit the measurement report to the second base station.

In a fifth aspect, an embodiment of the present application discloses a first base station, including:

a receiver for receiving sidelink status information of a terminal device;

a processor, configured to determine whether the processor supports a current state of a sidelink air interface of the terminal device according to the sidelink state information, and generate indication information when the processor does not support the current state of the sidelink air interface of the terminal device, where the indication information is used to indicate an adjustment mode;

a transmitter for transmitting the indication information to the terminal device.

In an optional design, when the network type of the serving cell of the terminal apparatus changes and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE, the processor is specifically configured to determine, according to a time-frequency resource allocation mode included in the sidelink status information, whether a current time-frequency resource allocation mode of the sidelink air interface is dynamically scheduled by the base station;

when the current time-frequency resource allocation mode of the air interface of the side link is the dynamic scheduling of the base station, the processor determines whether the current data transmission mode of the air interface of the side link is unicast or multicast according to the data transmission mode included in the state information of the side link;

when the current data transmission mode of the air interface of the side link is unicast or multicast, the processor determines whether the terminal device activates at least one of a retransmission mechanism and a channel state feedback mechanism according to a functional state included in the side link state information;

when the terminal device activates a retransmission mechanism and/or a channel state feedback mechanism, the processor determines that the processor does not support the current state of a sidelink air interface of the terminal device. .

In an optional design, when the first base station is a long term evolution base station eNB, the processor is specifically configured to determine, when the terminal apparatus camps on a network to the first base station, whether a time-frequency resource pool of the sidelink air interface included in the sidelink status information in a non-camped state conflicts with a time-frequency resource pool allocated to the terminal apparatus by itself, and/or conflicts with a time-frequency resource applied by itself;

and when the first base station determines that the time frequency resource pool conflicts with a time frequency resource pool allocated for the terminal device by the first base station and/or conflicts with time frequency resources applied by the first base station, the processor determines that the first base station does not support the current state of a side link air interface of the terminal device.

In an alternative design, the transmitter is specifically configured to transmit the indication information to the second base station when the terminal device is handed over from a cell of the second base station to a cell of the first base station, so that the second base station forwards the indication information to the terminal device.

In a sixth aspect, an embodiment of the present application discloses a second base station, including:

a receiver for receiving a measurement report of a terminal device;

a processor, configured to determine whether a network type of a serving cell of the terminal device changes according to the measurement report, and generate sidelink status information according to a status of a sidelink air interface of the terminal device before cell switching when the network type of the serving cell of the terminal device changes;

the receiver is further configured to receive, from the first base station, indication information corresponding to the sidelink status information, where the indication information is used to indicate an adjustment mode;

the transmitter is further configured to transmit the indication information to the terminal device.

when the time-frequency resource allocation mode is the first mode, the processor determines whether the current data transmission mode of the side link air interface is unicast or multicast;

when the current data transmission mode of the air interface of the side link is unicast or multicast, the processor determines whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism;

when at least one of the retransmission mechanism and the channel state feedback mechanism is activated, the processor generates the sidelink state information according to the state of the sidelink air interface before cell switching.

In a seventh aspect, an embodiment of the present application discloses a terminal apparatus, including:

a processor and a memory, wherein the processor is capable of processing a plurality of data,

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so as to enable the communication apparatus to perform the communication method in the first aspect and the various optional designs included in the first aspect under multiple network systems.

In an eighth aspect, an embodiment of the present application discloses a first base station, including:

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so as to enable the communication apparatus to execute the second aspect, and the communication method in multiple network systems in various optional designs included in the second aspect.

In a ninth aspect, an embodiment of the present application discloses a second base station, including:

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so as to enable the communication apparatus to execute the third aspect, and the communication method in the multiple network systems in various optional designs included in the third aspect.

In a tenth aspect, an embodiment of the present application discloses a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the communication method in the first aspect and in the multiple network systems in the various optional designs included in the first aspect.

In an eleventh aspect, embodiments of the present application disclose a computer-readable storage medium having instructions stored therein, which, when executed on a computer, cause the computer to perform the second aspect, and the communication method in multiple network systems in various optional designs included in the second aspect.

In a twelfth aspect, embodiments of the present application disclose a computer-readable storage medium having instructions stored therein, which, when run on a computer, cause the computer to perform the third aspect, and the communication method in multiple network systems in various optional designs included in the third aspect.

The embodiment of the application discloses a communication method under multiple network systems. In the method, when a terminal device determines that the network state of the terminal device changes, the terminal device generates and transmits sidelink state information according to the state of a sidelink air interface before the network state changes; after acquiring the sidelink status information, the first base station judges whether the first base station can support the status of a sidelink air interface after the network status changes or not based on the sidelink status information, and if the first base station cannot support the status, the first base station generates indication information including an adjusting mode and transmits the indication information; after receiving the indication information, the terminal device adjusts the state of the air interface of the sidelink through an adjustment mode included in the indication information, so that the terminal device can communicate through the adjusted air interface of the sidelink after the network state changes.

In the prior art, because the communication functions of the sidelink air interfaces supported by different network systems usually have differences, when the network state of the terminal device changes, the terminal device cannot continue to communicate with other terminal devices through the sidelink air interface due to the differences, thereby causing communication interruption between the terminal devices. By the scheme disclosed in the embodiment of the application, if the network state of the terminal device changes, the terminal device can adjust the state of the air interface of the sidelink, so that the adjusted air interface of the sidelink can communicate through the adjusted air interface of the sidelink after the network state changes, thereby avoiding the problem of communication interruption between the terminal devices and solving the problems in the prior art.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

Fig. 1 is a schematic workflow diagram of a communication method in a multi-network system applied in an embodiment of the present application;

fig. 2 is a schematic application scenario diagram of a communication method in a multi-network system disclosed in an embodiment of the present application;

fig. 3 is a schematic workflow diagram of a communication method in a multi-network system according to an embodiment of the present application;

fig. 4 is a schematic view of a workflow for adjusting a state of an air interface of a sidelink in a communication method under multiple network systems according to an embodiment of the present application;

fig. 5 is a schematic view of a workflow for adjusting a state of an air interface of a sidelink in a communication method in a multi-network system applied in the embodiment of the present application;

fig. 6 is a schematic application scenario diagram of a communication method in a multi-network system according to an embodiment of the present application;

fig. 7 is a schematic workflow diagram of a communication method in a multi-network system according to an embodiment of the present application;

fig. 8 is a schematic workflow diagram of a communication method in a multi-network system according to an embodiment of the present application;

fig. 9 is a schematic information interaction diagram of a communication method in a multi-network system disclosed in an embodiment of the present application;

fig. 10 is a schematic workflow diagram of a communication method in a multi-network system according to an embodiment of the present application;

fig. 11 is a schematic workflow diagram of a communication method in a multi-network system according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a communication apparatus in a multi-network system according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a communication apparatus in a multi-network system according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a communication apparatus in a multi-network system according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a communication device in a multi-network system disclosed in an embodiment of the present application.

Detailed Description

The communication method and the corresponding device under the multi-network system disclosed by the embodiment of the application are applied to the Internet of vehicles, wherein the Internet of vehicles comprises a plurality of vehicles (namely terminal devices) with communication capacity, different terminal devices can communicate with each other, and each terminal device can communicate with a base station. The terminal device realizes communication with the base station through a Uu air interface, and in addition, the terminal device realizes communication with other terminal devices through a sidelink air interface.

In addition, the current terminal device often supports multiple network formats simultaneously, and in this case, the terminal device may communicate with the base station of the network format through the Uu air interface of the network format to which the terminal device is connected, and the terminal device may communicate with other terminal devices through the sidelink air interfaces supported by different network formats. For example, the terminal device may support an NR network type and an LTE network type at the same time, and may communicate with the gNB through a Uu air interface of the NR network type when the terminal device accesses the NR network type, and may communicate with the eNB through a Uu air interface of the LTE network type when the terminal device accesses the LTE network type. In addition, when the terminal device communicates with other terminal devices through the sidelink air interface, the adopted network system is not limited by the network system accessed by the terminal device, for example, no matter the terminal device is accessed to the NR network system or the LTE network system, the terminal device can communicate with other terminal devices through the sidelink air interface of the NR network system or the sidelink air interface of the LTE network system.

Furthermore, when the terminal device communicates with other terminal devices through the air interface of the sidelink, the adopted time-frequency resources can be determined through two modes, in the first mode, the base station dynamically schedules the time-frequency resources of the terminal device on the air interface of the sidelink in real time, in the second mode, the base station pre-configures a time-frequency resource pool of the terminal device on the air interface of the sidelink, and each terminal device determines the time-frequency resources which can be applied by the terminal device in the time-frequency resource pool.

Additionally, the second mode may include at least one sub-mode. The second mode generally includes three sub-modes when the serving cell of the terminal device is a cell of a new radio communication NR base station gNB. In the first sub-mode, each terminal device sends Sidelink Control Information (SCI) while sending data, where the SCI includes a position of a time-frequency resource occupied by the terminal device and an occupation manner (e.g., whether the SCI is periodic occupation or not, an occupation duration, etc.), and before sending data, the terminal device monitors SCIs sent by other terminal devices, determines an idle time-frequency resource in a time-frequency resource pool based on the SCIs sent by the other terminal devices, and uses the idle time-frequency resource as a time-frequency resource applied to send the data by itself; in the second sub-mode, the terminal device pre-configures a transmission pattern, or the base station pre-configures a transmission pattern and then transmits the transmission pattern to the terminal device, wherein the transmission pattern specifies time-frequency resources belonging to each terminal device in a time-frequency resource pool, so that the terminal device determines the time-frequency resources used by the terminal device according to the transmission pattern; in the third sub-mode, one of the adjacent terminal devices is used as a cluster head, and the cluster head allocates time-frequency resources in the time-frequency resource pool to the peripheral terminal devices.

When the serving cell of the terminal device is a cell of a long term evolution base station eNB, the second mode generally includes only the first seed mode and the second seed mode described above.

In addition, the time-frequency resource applied when the terminal device communicates is composed of a time-domain resource and a frequency-domain resource, the time-domain resource includes a start position and a time-domain length of a time domain occupied when the terminal device communicates, and the frequency-domain resource includes a start position and a frequency-domain length of a frequency domain occupied when the terminal device communicates. In addition, the time frequency resources can be divided into transmission time frequency resources and reception time frequency resources according to the communication type of the terminal device, the time frequency resources are used for transmitting when the terminal device transmits data, and the time frequency resources are used for receiving when the terminal device receives data. The sending time-frequency resource and the receiving time-frequency resource of the same terminal device may be the same or different, and this is not limited in this application.

In order to clarify the aspects of the present application, various embodiments are disclosed below. Referring to a work flow diagram shown in fig. 1, a first embodiment of the present application discloses a communication method in multiple network systems, where the method includes the following steps:

step S11, when the network state of the terminal device changes, the terminal device generates the sidelink state information according to the state of the sidelink air interface before the network state changes.

Wherein the change in the network status comprises: and the network system of the service cell of the terminal device is changed, and/or the terminal device is changed from the non-network-residing state to the network-residing state.

Since the terminal device refers to a vehicle having a communication function in the internet of vehicles, and the vehicle often needs to move, the network state of the terminal device may change as the location moves.

In this case, in order to avoid communication interruption due to differences in communication functions of the air interface of the sidelink supported by different network systems, the terminal device generates and transmits the sidelink status information based on the status of the air interface of the sidelink before cell switching.

Step S12, the terminal device transmits the sidelink status information to the first base station.

Wherein the sidelink status information generated by the terminal device is received by the first base station. The first base station may determine, based on the sidelink status information, whether the first base station can support a status of a sidelink air interface after the network status changes after the network status of the terminal apparatus changes. And if the first base station determines that the first base station can not support the information, generating corresponding indication information and transmitting the indication information so that the terminal device can acquire the indication information.

And when the network standard of the service cell of the terminal device changes, the first base station is a base station corresponding to the changed service cell. That is, when the terminal device is handed over from the cell of the source base station to the cell of the target base station, and the network systems of the source base station and the target base station are different, the target base station is the first base station.

When the terminal device is changed from the non-network-residing state to the network-residing state, the base station where the terminal device resides is the first base station.

Step S13, the terminal device receives, from the first base station, indication information corresponding to the sidelink status information, where the indication information is used to indicate an adjustment method.

The adjusting mode is used for adjusting the state of the air interface of the sidelink.

Step S14, the terminal device adjusts the state of the air interface of the sidelink according to the adjustment manner, so that the terminal device communicates through the adjusted air interface of the sidelink.

The indication information is used for indicating an adjustment mode, and the adjustment mode corresponds to a state of a sidelink air interface which can be supported by the first base station. After receiving the indication information, the terminal apparatus adjusts the state of the air interface of the sidelink according to the adjustment manner, that is, after adjusting according to the adjustment manner, the first base station can support the adjusted state of the air interface of the sidelink. In this case, after the network status of the terminal apparatus changes, the communication can be continued over the adjusted sidelink air interface.

The embodiment of the application discloses a communication method under multiple network systems. In the method, when the network state of a terminal device changes, the terminal device generates sidelink state information according to the state of a sidelink air interface before the network state changes, and transmits the sidelink state information to a first base station; after acquiring the sidelink status information, the first base station judges whether the first base station can support the status of a sidelink air interface after the network status changes based on the sidelink status information, and when the first base station cannot support the status, the first base station generates indication information including an adjustment mode and transmits the indication information to the terminal device; after receiving the indication information, the terminal device adjusts the state of the air interface of the sidelink through the adjustment mode indicated by the indication information, so that the terminal device can communicate through the adjusted air interface of the sidelink after the network state changes.

In the prior art, because the communication functions of the sidelink air interfaces supported by different network systems usually have differences, when the network state of the terminal device changes, the terminal device cannot continue to communicate with other terminal devices through the sidelink air interface due to the differences, thereby causing communication interruption between the terminal devices.

According to the scheme disclosed by the embodiment of the application, when the network state of the terminal device changes, the terminal device can adjust the state of the air interface of the sidelink, so that the adjusted air interface of the sidelink can communicate through the adjusted air interface of the sidelink after the network state changes, the problem of communication interruption between the terminal devices is avoided, and the problem in the prior art is solved.

When the network system of the serving cell of the terminal device changes, the terminal device determines whether the network state of the terminal device changes. That is, when the terminal device needs to be switched from the cell of the second base station to the cell of the first base station and the network standard of the second base station is different from the network standard of the first base station, the terminal device determines that the network state of the terminal device changes.

For example, referring to the schematic view of the scenario shown in fig. 2, when the vehicle moves from the area covered by the second base station to the area covered by the first base station, or when the vehicle moves from the first overlapping area covered by the second base station and the first base station to the second overlapping area, and the signal of the second base station is stronger in the first overlapping area and the signal of the first base station is stronger in the second overlapping area, a situation that the terminal device is switched from the cell of the second base station to the cell of the first base station may occur, thereby causing the terminal device to have a cell switch. When the network standard of the second base station is different from the network standard of the first base station, it indicates that the terminal device is switched from one network standard to another network standard, that is, the network standard of the serving cell of the terminal device changes, and in this case, it can be determined that the network state of the terminal device changes.

In this embodiment, the second base station and the first base station have different corresponding network systems. In an alternative implementation, the second base station is a new radio communication NR base station gNB, and the first base station is a long term evolution base station eNB, i.e. the network format of the serving cell of the terminal device changes from the new radio communication NR to the long term evolution LTE.

And when the second base station is a new radio communication NR base station gNB, the network type of the second base station is indicated as the new radio communication NR network type. When the terminal device communicates through the air interface of the sidelink in the NR network system, the air interface of the sidelink of the terminal device can support three modes, namely unicast, multicast and broadcast. If the air interface of the side link communicates with other terminal devices in a unicast or multicast mode, a retransmission mechanism and/or a channel state feedback mechanism can also be activated.

The retransmission mechanism may be a Hybrid Automatic repeat request (HARQ). When time-frequency resources on a sidelink air interface are allocated to the terminal device through a first mode, namely, the base station real-time dynamically schedules the time-frequency resources of the terminal device on the sidelink air interface, if a retransmission mechanism is activated, the terminal device transmits feedback information to the gNB through the Uu interface after transmitting data to other terminal devices through the sidelink air interface, the gNB determines whether the data transmission is successful according to the feedback information, and if the data transmission is not successful, the base station schedules the time-frequency resources on the sidelink air interface for the terminal device again so that the terminal device can transmit the data again. When allocating time-frequency resources on a sidelink air interface for a terminal device through a second mode, namely negotiating and allocating the time-frequency resources in a time-frequency resource pool among the terminal devices, if a retransmission mechanism is activated, after the terminal device transmits data to other terminal devices through the sidelink air interface, the terminal device also acquires feedback information transmitted by other terminal devices through the sidelink air interface, based on the feedback information, the terminal device determines whether the data transmission is successful, if the data transmission is not successful, namely the terminal device indicates that the terminal device needs to retransmit the data, the terminal device negotiates corresponding time-frequency resources for the data needing to be retransmitted, so that the terminal device can transmit the data again.

In addition, when the time-frequency resources on the air interface of the sidelink are allocated to the terminal device through the first mode, that is, the time-frequency resources on the air interface of the sidelink are dynamically scheduled by the base station in real time, if a Channel State (CSI) feedback mechanism is activated, the terminal device feeds back its own CSI to the gNB through the Uu port before sending data, and the gNB determines the Channel state of the terminal device according to the received feedback and schedules the time-frequency resources on the air interface of the sidelink according to the CSI. When allocating time-frequency resources on the air interface of the sidelink for the terminal device through the second mode, that is, when the terminal device determines the self-available time-frequency resources in the time-frequency resource pool, if the channel state feedback mechanism is activated, before the terminal device sends data to other terminal devices through the air interface of the sidelink, the terminal device also feeds back the self-channel state information CSI to other terminal devices through the air interface of the sidelink through the last-applied time-frequency resources, and each terminal device negotiates based on the feedback, thereby determining the time-frequency resources available for the terminal device.

That is, when the terminal device communicates through the air interface of the sidelink in the NR network system and adopts a unicast or multicast data transmission manner, the retransmission mechanism and/or the channel state feedback mechanism may be activated to improve the reliability and performance of data communication.

In addition, when the first base station is an eNB, it indicates that the network standard of the first base station is LTE, and in this case, when the serving cell of the terminal apparatus is the cell of the first base station and the terminal apparatus communicates through a sidelink air interface in the LTE network standard, the sidelink air interface of the terminal apparatus can only support a broadcast mode, and therefore does not support a retransmission mechanism and a channel state feedback mechanism. That is to say, when the terminal device communicates through the air interface of the sidelink in the LTE network system, no matter whether the first mode or the second mode is used to allocate the time-frequency resource on the air interface of the sidelink to the terminal device, the terminal device can only support the broadcast mode for data transmission, and does not support the retransmission mechanism and the channel state feedback mechanism.

Accordingly, the differences of the communication functions of the sidelink air interfaces respectively supported by the NR network system and the LTE network system can be determined as follows:

from the above table, it can be seen that there is a difference between the NR network system and the LTE network system in the communication functions of the air interface of the sidelink respectively supported by the NR network system and the LTE network system. Therefore, when the terminal device needs to be switched from the cell of the gbb to the cell of the eNB, the terminal device may be interrupted when performing communication through the sidelink air interface, and the terminal device needs to generate sidelink status information, so that the first base station determines whether to support the current status of the sidelink air interface according to the sidelink status information, and instructs the terminal device to adjust the status of the sidelink air interface through the indication information if the terminal device does not support the sidelink air interface.

Based on the above differences in the communication functions of the sidelink air interfaces respectively supported by the NR network standard and the LTE network standard, when the second base station is a gNB and the first base station is an eNB, the first base station cannot support the state of the sidelink air interface of the terminal apparatus before cell handover if the terminal apparatus meets the following three conditions before cell handover:

(1) the terminal device adopts a first mode to determine time frequency resources, namely, the base station dynamically schedules the time frequency resources of the terminal device on an air interface of a sidelink in real time;

(2) the side link air interface of the terminal device communicates with other terminal devices in a unicast or multicast mode;

(3) the terminal device activates a retransmission mechanism and/or a channel state feedback mechanism.

Before cell switching, that is, when accessing an NR network, if the three conditions are met simultaneously, the terminal device transmits feedback information to the gNB through a retransmission mechanism, and/or transmits channel state information to the gNB through a channel state feedback mechanism, in this case, the gNB dynamically schedules time-frequency resources of the terminal on an air interface of a sidelink in real time based on the received feedback information and/or channel state information, and the terminal device communicates with other terminal devices in a unicast or multicast manner according to the time-frequency resources scheduled by the gNB.

After the terminal device is accessed to the LTE network system, if the state of the air interface of the sidelink is not adjusted, the three conditions are continuously met at the same time, because the air interface of the sidelink in the LTE network system only supports the data transmission of broadcasting, the retransmission mechanism and the channel state feedback mechanism cannot continuously operate, and in this case, the eNB cannot acquire the feedback information and the channel state information of the terminal device, and therefore, the eNB cannot continuously dynamically schedule the time-frequency resource of the terminal device on the air interface of the sidelink in real time in a manner before cell switching, that is, the eNB cannot support the state of the air interface of the sidelink of the terminal device before cell switching, which causes communication interruption between the terminal devices.

In addition, if the terminal device does not satisfy the above three conditions at the same time, after the terminal device completes the cell handover, the first base station can support the state of the sidelink air interface of the terminal device before the cell handover, which does not cause the communication interruption between the terminal devices.

For example, when the second base station is a gbb and the first base station is an eNB, before cell switching, if the first two conditions are simultaneously met, that is, the terminal apparatus determines the time-frequency resource by using the first mode, that is, the base station real-time dynamically schedules the time-frequency resource on the air interface of the sidelink, and the air interface of the sidelink of the terminal apparatus performs data transmission with other terminal apparatuses in a unicast or multicast manner, it indicates that before cell switching, the gbb does not perform real-time dynamic scheduling on the time-frequency resource on the air interface of the sidelink by using information transmitted by a retransmission mechanism and/or a channel state feedback mechanism. Then, after the terminal device completes cell handover, the eNB may determine, through interaction with the gNB, a manner of dynamically scheduling the time-frequency resource of the air interface of the sidelink of the terminal device before the gNB, and continue to use the manner to dynamically schedule the time-frequency resource of the terminal device on the air interface of the sidelink in real time. In addition, after determining that the terminal device is accessed to the LTE network, the terminal device may adjust the data transmission mode of the air interface of the sidelink to broadcast, and continue to communicate with other terminal devices in a broadcast mode, that is, the air interface of the sidelink follows the specification of the LTE network standard to communicate with other terminal devices, and may also continue to communicate with other terminal devices in a unicast or multicast mode, that is, the air interface of the sidelink follows the specification of the NR network standard to communicate with other terminal devices. Therefore, communication between the terminal apparatuses is not interrupted.

In this case, when the network system of the serving cell of the terminal apparatus changes and the network system of the serving cell changes from the new radio communication NR to the long term evolution LTE, the sidelink status information includes: the side link air interface is in a time frequency resource allocation mode, a data transmission mode and a function state before cell switching.

The time frequency resource allocation mode comprises a first mode and a second mode, wherein the first mode is dynamic scheduling of a base station, and the second mode is used for determining self-applicable time frequency resources in a time frequency resource pool for the terminal device; the data transmission mode comprises the following steps: unicast, multicast and broadcast; the functional states include: whether to activate a retransmission mechanism and/or a channel state feedback mechanism.

After acquiring the sidelink status information, the first base station may determine whether the terminal device satisfies the three conditions before cell handover according to the sidelink status information, thereby determining whether the terminal device supports the current status of the sidelink air interface after cell handover occurs, and further determining whether the status of the sidelink air interface needs to be adjusted.

Further, the data transmission method included in the sidelink status information in the embodiment of the present application may correspond to the granularity of the terminal device or correspond to the service granularity.

For different terminal devices, the air interface of the sidelink may adopt different data transmission modes, and in this case, the data transmission mode included in the sidelink status information corresponds to the terminal device, that is, the granularity corresponding to the terminal device. In addition, when the terminal device executes different data transmission services, the sidelink air interface may adopt different data transmission modes, and in this case, the data transmission mode included in the sidelink status information corresponds to the data transmission service executed by the terminal device, that is, corresponds to the service granularity.

In addition, the data transmission mode may be indicated explicitly or implicitly. The explicit indication indicates whether the data transmission method is unicast, multicast, or broadcast in the sidelink status information. The implicit indication indicates that a data transmission method is indicated by an IP address of a receiving end in the sidelink status information, when the IP address of the receiving end included in the sidelink status information is a unicast address, it indicates that the terminal device adopts the unicast data transmission method, when the IP address of the receiving end included in the sidelink status information is a multicast address, it indicates that the terminal device adopts the multicast data transmission method, and when the IP address of the receiving end included in the sidelink status information is a broadcast address, it indicates that the broadcast data transmission method is adopted.

In the embodiment of the application, the terminal device can generate and transmit the sidelink status information each time when the terminal device determines that the network status of the terminal device changes. In addition, the terminal device may further determine whether the air interface state of the sidelink needs to be adjusted after determining that the network state of the terminal device changes, and generate the sidelink state information only when the air interface state of the sidelink needs to be adjusted. In this case, when the network type of the serving cell of the terminal apparatus changes and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE, referring to fig. 3, before the terminal apparatus generates the sidelink status information according to the status of the sidelink air interface before the network status changes, the method further includes the following steps:

step S111, the terminal device determines whether the time-frequency resource allocation mode of the sidelink air interface is the first mode, if so, performs the operation of step S112, and if not, performs the operation of step S115.

If the terminal device determines that the time-frequency resource allocation mode of the air interface of the sidelink is not the first mode, that is, not dynamically scheduled by the base station, it indicates that the time-frequency resource allocation mode of the air interface of the sidelink negotiates allocation of time-frequency resources in a time-frequency resource pool for each terminal device, and in this case, the LTE network standard can support the state of the air interface of the sidelink, thereby determining that the state of the air interface of the sidelink does not need to be adjusted.

Step S112, when the time-frequency resource allocation mode of the sidelink air interface is the first mode, the terminal device determines whether the current data transmission mode of the sidelink air interface is unicast or multicast, if so, performs the operation of step S113, and if not, performs the operation of step S115.

If the terminal device determines that the current data transmission mode of the air interface of the sidelink is not unicast or multicast, in this case, the LTE network standard can support the state of the air interface of the sidelink, thereby determining that the state of the air interface of the sidelink does not need to be adjusted.

Step S113, when the current data transmission mode of the sidelink air interface is unicast or multicast, the terminal device determines whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism, if so, performs the operation of step S114, and if not, performs the operation of step S115.

In this case, the LTE network system may support the state of the air interface of the sidelink, thereby determining that the state of the air interface of the sidelink does not need to be adjusted.

Step S114, when at least one of the retransmission mechanism and the channel state feedback mechanism is activated, the terminal device generates the sidelink state information according to the state of the sidelink air interface before the network state changes.

In this case, it indicates that the first base station cannot support the state of the sidelink air interface of the terminal device before the network state changes, and therefore, the sidelink state information needs to be generated so that the first base station can acquire the sidelink state information.

Step S115, the terminal device determines that generation of the sidelink status information is not required.

In the embodiment of the present application, through the operations in step S111 to step S115, the state of the terminal device before the network state changes is determined, and if the following three conditions are simultaneously satisfied, the operation of generating the sidelink status information is executed again:

In addition, in an actual application scenario, the execution sequence of step S111 to step S114 is not strictly sequential. For example, it may also be determined whether the current data transmission mode of the air interface of the sidelink is unicast or multicast, and if so, then determine whether to activate at least one of the retransmission mechanism and the channel state feedback mechanism, and if so, then determine whether the time-frequency resource allocation mode of the air interface of the sidelink is dynamically scheduled by the base station. Of course, other execution sequences may be adopted, and the embodiment of the present application is not limited thereto.

In this embodiment of the application, after receiving the indication information, the terminal apparatus may adjust the state of the air interface of the sidelink based on an adjustment manner included in the indication information, and according to a difference of the adjustment manner in the indication information, the adjustment manner of the state of the air interface of the sidelink also includes multiple manners.

In one possible adjustment manner, when the adjustment manner is to adjust a time-frequency resource allocation mode of the sidelink air interface, the adjusting, by the terminal device, a state of the sidelink air interface according to the adjustment manner includes:

and the terminal device determines self-applicable time-frequency resources in the time-frequency resource pool so as to communicate through the self-applicable time-frequency resources in the time-frequency resource pool.

And when the adjustment mode is to adjust the time-frequency resource allocation mode of the air interface of the sidelink, indicating that the first base station instructs the terminal device to adjust the time-frequency resource allocation mode of the air interface of the sidelink to a second mode, and in the second mode, the first base station configures a time-frequency resource pool for the air interface of the sidelink of the terminal device, wherein the time-frequency resource pool configured by the first base station can notify the terminal device through indication information, so that the terminal device determines the time-frequency resource pool configured by the first base station based on the indication information. Then, the terminal device determines the self-applicable time frequency resource in the time frequency resource pool.

The time-frequency resources of the terminal device include transmission time-frequency resources and reception time-frequency resources, and in order to ensure uninterrupted communication between the terminal devices, it is necessary that data transmitted by the terminal device can be received by the terminal device which originally communicates with the terminal device, and that the terminal device can receive data transmitted by the terminal device which originally communicates with the terminal device. Therefore, the sending time-frequency resource in the time-frequency resource pool allocated by the first base station is in the first sending time-frequency resource, that is, the sending time-frequency resource in the time-frequency resource pool is the same as the first sending time-frequency resource, or the sending time-frequency resource in the time-frequency resource pool is in the range of the first sending time-frequency resource, wherein the first sending time-frequency resource is the sending time-frequency resource of the air interface of the sidelink before the adjustment, so that the terminal device which originally communicates with the terminal device can still receive the data sent by the terminal device. In addition, the receiving time-frequency resource in the time-frequency resource pool configured by the first base station is the same as the first receiving time-frequency resource, and the first receiving time-frequency resource is the receiving time-frequency resource of the air interface of the sidelink before being adjusted, so that the terminal device can continue to receive the data sent by the terminal device which is originally communicated with the terminal device.

The terminal device may load a first transmission time-frequency resource and a first reception time-frequency resource in sidelink status information, where the sidelink status information further includes the first transmission time-frequency resource and the first reception time-frequency resource, so that the first base station may obtain the first transmission time-frequency resource and the first reception time-frequency resource.

Or, the terminal device may further separately generate time-frequency resource reporting information including the first sending time-frequency resource and the first receiving time-frequency resource, and transmit the time-frequency resource reporting information to the first base station, so that the first base station obtains the first sending time-frequency resource and the first receiving time-frequency resource through the time-frequency resource reporting information.

Or, the first sending time-frequency resource and the first receiving time-frequency resource are transmitted to the first base station by the second base station. In this case, the first base station may obtain the first sending time-frequency resource and the first receiving time-frequency resource based on the information transmitted by the second base station.

Further, the adjustment does not need to modify the data transmission mode of the air interface of the sidelink, that is, the terminal devices still communicate with each other in a unicast or multicast mode. In addition, the modification does not need to modify the function state, i.e., the retransmission mechanism and/or the channel state feedback mechanism are/is continuously kept in the activated state, i.e., if the terminal device activates the retransmission mechanism before the cell handover, the retransmission mechanism can be continuously kept in the activated state, and if the terminal device activates the channel state feedback mechanism before the cell handover, the channel state feedback mechanism can be continuously kept in the activated state. However, the current retransmission mechanism does not transmit feedback information to the gNB any more, but transmits feedback information to other terminal apparatuses, and the other terminal apparatuses negotiate with the terminal apparatus to allocate time-frequency resources in the time-frequency resource pool based on the received feedback information. Moreover, the current channel state feedback mechanism does not transmit the channel state information to the gNB any more, but transmits the channel state information to other terminal apparatuses, and the other terminal apparatuses negotiate with the terminal apparatus to allocate time-frequency resources in the time-frequency resource pool based on the received channel state information.

In another possible adjustment manner, when the adjustment manner is to adjust the data transmission manner of the air interface of the sidelink, referring to fig. 4, the adjusting, by the terminal device, the state of the air interface of the sidelink according to the adjustment manner indicated by the indication information includes:

step S131, the terminal apparatus adjusts the data transmission mode of the air interface of the sidelink to a broadcast mode.

Step S132, the terminal device generates a scheduling request including the needed time-frequency resource according to the transmission requirement of the side-link air interface.

Step S133, the terminal apparatus transmits the scheduling request to the first base station.

The scheduling request is transmitted to the first base station, and after receiving the scheduling request, the first base station determines time-frequency resources required by the terminal device and allocates corresponding time-frequency resources to the terminal device.

In the process of transmitting the scheduling request, the terminal device may directly transmit the scheduling request to the first base station, or the terminal device may transmit the scheduling request to the second base station, and the second base station forwards the scheduling request to the first base station.

Step S134, the terminal device determines a time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication in a broadcast manner according to the time-frequency resource.

In the foregoing adjustment manner, the terminal device may adjust the data transmission manner of the air interface of the sidelink from unicast or multicast to a broadcast manner, and this operation may be implemented by modifying a destination IP address in data to be sent by the terminal device, that is, the terminal device modifies the destination IP address corresponding to the unicast manner or the destination IP address corresponding to the multicast manner in the data to be sent into a broadcast IP address. Or, in another possible implementation manner, the terminal device deletes the destination IP address corresponding to the unicast manner or the destination IP address corresponding to the multicast manner in the data to be sent, in which case, the terminal device sends the data in the broadcast manner.

In the above adjustment mode, the time-frequency resource allocation mode of the uplink air interface is kept as the dynamic scheduling of the base station, and then the eNB dynamically schedules the time-frequency resource of the uplink air interface. In this case, the terminal device generates and transmits a scheduling request including the required time-frequency resource according to the transmission requirement of the sidelink air interface, and the eNB allocates the corresponding time-frequency resource to the terminal device based on the required time-frequency resource included in the scheduling request after acquiring the scheduling request. In addition, the data transmission mode of the air interface of the side link is changed into a broadcast mode, and because the broadcast mode does not support a retransmission mechanism and a channel state feedback mechanism, if the retransmission mechanism and/or the channel state feedback mechanism are/is activated before, both the retransmission mechanism and the channel state feedback mechanism are closed.

In another possible adjustment manner, when the adjustment manner is to adjust the functional state of the air interface of the sidelink, referring to fig. 5, the adjusting, by the terminal device according to the adjustment manner indicated by the indication information, the state of the air interface of the sidelink includes:

step S135, the terminal apparatus adjusts the retransmission mechanism and the channel state feedback mechanism to the off state.

Step S136, the terminal device generates a scheduling request including the needed time frequency resource according to the transmission requirement of the side link air interface.

Step S137, the terminal apparatus transmits the scheduling request to the first base station.

Step S138, the terminal device determines a time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication according to the time-frequency resource.

In the above adjustment manner, the terminal device may keep the time-frequency resource allocation mode and the data transmission manner of the sidelink air interface unchanged, that is, the terminal device still allocates the time-frequency resource to the sidelink air interface in a manner of dynamic scheduling by the base station, and when the terminal device communicates with other terminal devices, a unicast or multicast manner is still adopted. However, the adjustment method will adjust the retransmission mechanism and the channel state feedback mechanism to be in the off state, even if both the retransmission mechanism and the channel state feedback mechanism are in the off state, in this case, the eNB will not dynamically schedule the time-frequency resources according to the retransmission mechanism and the channel state feedback mechanism, but allocates corresponding time-frequency resources to the air interface of the sidelink of the terminal device according to the scheduling request transmitted by the terminal device.

The above adjustment mode keeps the time frequency resource allocation mode of the side link air interface unchanged, even if the eNB dynamically schedules the time frequency resource of the side link air interface, keeps the data transmission mode unchanged, and closes the retransmission mechanism and the channel state feedback mechanism at the same time. In this case, the terminal device generates and transmits a scheduling request including a required time-frequency resource according to a transmission requirement of the sidelink air interface, the eNB allocates a corresponding time-frequency resource to the terminal device based on the required time-frequency resource included in the scheduling request after acquiring the scheduling request, and the terminal device still performs communication in a unicast or multicast mode used before cell switching after acquiring the time-frequency resource.

In the method disclosed in the above embodiment, the terminal device needs to transmit the sidelink status information, so that the first base station acquires the sidelink status information. Wherein the terminal device may transmit the sidelink status information to the first base station during registration with the first base station. In this case, the terminal apparatus adjusts the state of the air interface of the sidelink during the cell handover, so that the terminal apparatus can communicate through the air interface of the sidelink after the state adjustment after the cell handover is completed, thereby improving the communication efficiency.

The indication information sent by the first base station to the terminal device may be Radio Resource Control (RRC) reconfiguration information.

In the above embodiments, a method for adjusting the state of the uplink air interface when the terminal device performs cell handover is disclosed. In a practical application scenario, the terminal device may sometimes change from the non-network-resident state to the network-resident state. For example, referring to the schematic diagram shown in fig. 6, a terminal device moving from an area without network coverage to an area with network coverage, or from an area with weak network signals to an area with strong network signals, may cause the terminal device to change from an camped state to a camped state.

To address this application scenario, the present application also discloses another embodiment. In this embodiment, the method further comprises the following steps:

In this case, the sidelink status information includes at least: and the time frequency resource pool of the side link air interface in the non-network-residing state.

When the terminal device changes from the non-network-residing state to the network-residing state, and the time-frequency resource allocation mode of the side link air interface negotiates and allocates the time-frequency resources in the time-frequency resource pool among the terminal devices, the base station after the terminal device resides in the network-residing state will usually follow the time-frequency resource allocation mode of the terminal device when the terminal device is in the non-network-residing state, that is, the base station after the network-residing will allocate the time-frequency resource pool for the side link air interface of the terminal device, and the time-frequency resources applied by the base station in the time-frequency resource pool are determined among the terminal devices in the manner of negotiation and allocation.

However, the time-frequency resource pool applied by the terminal device in the non-network-residing state may conflict with the time-frequency resource pool allocated by the base station after network residence, which may affect the communication of the terminal device. For example, if the transmission time-frequency resource in the time-frequency resource pool allocated by the base station after network camping is different from the transmission time-frequency resource of the terminal device in the non-network camping state, it may cause that other terminal devices that have previously received the data of the terminal device cannot continue to receive the data transmitted by the terminal device; in addition, if the receiving time-frequency resources in the time-frequency resource pool allocated by the base station after network camping are different from the receiving time-frequency resources of the terminal device in the non-network camping state, the terminal device may not continuously receive the data sent by other terminal devices.

In addition, the time-frequency resource pool applied by the terminal device in the non-network-residing state may also conflict with the time-frequency resource applied by the base station after network residing, for example, when the base station after network residing communicates with each terminal device through the Uu port of the terminal device, the applied time-frequency resource may be included in the time-frequency resource pool.

In this case, when the base station in which the terminal device resides determines that the time-frequency resource pool when the terminal device does not reside conflicts with the time-frequency resource pool configured for the terminal device, or determines that the time-frequency resource pool when the terminal device does not reside conflicts with the time-frequency resource applied by the base station, the base station may generate indication information to indicate the terminal device to adjust the state of the air interface of the sidelink.

When the sidelink air interface state information only includes the time frequency resource pool of the sidelink air interface in the non-network-residing state, the indication information can indicate the terminal device to adjust the time frequency resource allocation mode of the sidelink air interface to the base station real-time dynamic scheduling. In this case, after receiving the indication information, the terminal apparatus adjusts its time-frequency resource allocation mode to the first mode, that is, the base station after network residence dynamically adjusts the time-frequency resource applied by the side link air interface of the terminal apparatus in the communication process.

Further, when the sidelink status information further includes a data transmission mode and a function status in the non-network-camping state, the base station after network camping may further obtain the data transmission mode and the function status of the terminal device in the non-network-camping state, and in this case, the indication information may further indicate the terminal device to correspondingly adjust the data transmission mode and the function status.

For example, if the base station after camping is the gbb, the gbb may indicate, through the indication information, that the time-frequency resource allocation mode of the air interface of the sidelink is updated to the real-time dynamic scheduling of the base station, and update the data transmission mode to the unicast mode or the multicast mode, and activate the retransmission mechanism and/or the channel state feedback mechanism, thereby improving the communication quality.

The indication information sent by the camped base station to the terminal device may be Radio Resource Control (RRC) reconfiguration information.

By the embodiment, in an application scenario that the terminal device is changed from the non-network-residing state to the network-residing state, and the time-frequency resource allocation mode of the sidelink air interface negotiates and allocates the time-frequency resources in the time-frequency resource pool among the terminal devices, the problem of communication interruption caused by the fact that the time-frequency resource pool applied by the terminal device in the non-network-residing state conflicts with the time-frequency resource pool allocated by the base station after network residing, or the time-frequency resource pool when the terminal device is not network-residing conflicts with the time-frequency resource pool allocated by the base station for the terminal device does not occur.

In addition, when the terminal device needs to be handed over from the cell of the second base station to the cell of the first base station, the sidelink status information may also be generated by the second base station. In this case, the embodiment of the present application further includes the following steps:

the terminal device transmits a measurement report to a second base station.

The second base station, after receiving the measurement report, determines whether the terminal device needs to have a cell handover and further determines whether sidelink status information needs to be generated. When it is determined that sidelink status information needs to be generated, the second base station transmits the generated sidelink status information to the first base station.

Corresponding to the above embodiment, another embodiment of the present application discloses a communication method in multiple network systems, and referring to fig. 7, the method includes the following steps:

in step S21, the first base station receives the sidelink status information of the terminal device.

The first base station is a base station to which the terminal device is to be accessed, that is, when the terminal device is switched, a serving cell after the terminal device is switched is a cell of the first base station, and when the terminal device is changed from a non-network-residing state to a network-residing state, a cell in which the terminal device is networked is a cell of the first base station.

In an embodiment of the present application, the sidelink status information of the terminal device may be generated by the terminal device. Or, when the terminal device needs to be handed over from the cell of the second base station to the cell of the first base station, the sidelink status information of the terminal device may also be generated by the second base station, in this case, after receiving the measurement report of the terminal device, the second base station determines whether the terminal device needs to perform cell handover, and whether the network type of the first base station is the same as the network type of the second base station, and if not, the second base station may generate the sidelink status information and transmit the information to the first base station.

Step S22, the first base station determines whether itself supports the current state of the sidelink air interface of the terminal device according to the sidelink state information.

Step S23, when the current status of the sidelink air interface of the terminal device is not supported, the first base station generates indication information, where the indication information is used to indicate an adjustment mode.

Step S24, the first base station transmits the indication information to the terminal device.

After receiving the indication information, the terminal device may adjust the state of the uplink air interface according to the adjustment mode indicated by the indication information, so that the first base station can support the adjusted state of the uplink air interface.

Wherein, when the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE, referring to fig. 8, the determining, by the first base station, whether or not the first base station supports the current state of the sidelink air interface of the terminal device according to the sidelink state information includes:

step S221, the first base station determines, according to the time-frequency resource allocation mode included in the sidelink status information, whether the current time-frequency resource allocation mode of the sidelink air interface is base station dynamic scheduling, if yes, the operation of step S222 is executed, and if not, the operation of step S225 is executed.

Step S222, when the current time-frequency resource allocation mode of the sidelink air interface is dynamically scheduled by the base station, determining, by the first base station, whether the current data transmission mode of the sidelink air interface is unicast or multicast according to the data transmission mode included in the sidelink status information, if so, performing the operation of step S223, and if not, performing the operation of step S225.

Step S223, when the current data transmission mode of the sidelink air interface is unicast or multicast, determining, by the first base station, whether the terminal device activates at least one of a retransmission mechanism and a channel state feedback mechanism according to a functional state included in the sidelink state information, if so, performing the operation of step S224, and if not, performing the operation of step S225.

Step S224, when the terminal device activates a retransmission mechanism and/or a channel state feedback mechanism, the first base station determines that the first base station does not support the current state of the sidelink air interface of the terminal device.

Step S225, the first base station determines a current state of a sidelink air interface supporting the terminal apparatus.

In this embodiment, when the network type of the serving cell of the terminal device changes, and the network type of the serving cell changes from new radio communication NR (that is, the second base station is a gNB) to long term evolution LTE (that is, the first base station is an eNB), the first base station can determine, through the above operations, whether the terminal device simultaneously satisfies the following three conditions before cell handover:

When the first base station determines that the terminal device meets the three conditions before cell switching, the first base station may determine that the first base station does not support the current state of the air interface of the sidelink of the terminal device, and further, may generate corresponding indication information to indicate the terminal device to adjust the state of the air interface of the sidelink.

In addition, in an actual application scenario, the execution sequence of step S221 to step S224 is not strictly sequential. For example, the second base station may further determine whether the current data transmission mode of the sidelink air interface is unicast or multicast, if so, determine whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism, and if so, determine whether the time-frequency resource allocation mode of the sidelink air interface is the base station dynamic scheduling. Of course, other execution sequences may be adopted, and the embodiment of the present application is not limited thereto.

When the first base station determines that it does not support the current state of the air interface of the sidelink of the terminal device by itself through the operation in step S224, it may generate indication information in various forms, where the indication information includes different adjustment modes, so as to indicate that the terminal device adjusts the state of the air interface of the sidelink through the different adjustment modes.

When the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from the new radio communication NR to LTE, in one of the feasible implementations, the adjusting means is to adjust a time-frequency resource allocation mode of the air interface of the sidelink, and the indication information further includes a time-frequency resource pool allocated to the terminal device. Wherein a sending time-frequency resource in the time-frequency resource pool is in a first sending time-frequency resource, a receiving time-frequency resource in the time-frequency resource pool is the same as a first receiving time-frequency resource, the first sending time-frequency resource is a sending time-frequency resource of the air interface of the side link before adjustment, and the first receiving time-frequency resource is a receiving time-frequency resource of the air interface of the side link before adjustment.

In this case, the terminal apparatus adjusts the time-frequency resource allocation mode of the air interface of the sidelink to the second mode, negotiates with other terminal apparatuses, determines the self-applicable time-frequency resource in the time-frequency resource pool, and performs communication through the self-applicable time-frequency resource in the time-frequency resource pool.

By the adjusting method, the terminal device can adjust the state of the air interface of the sidelink to the state which can be supported by the first base station. Furthermore, a retransmission mechanism and/or a channel state feedback mechanism can be kept in an activated state, so that the reliability of communication between terminal devices can be guaranteed.

In another feasible implementation manner, the adjusting manner is to adjust a data transmission manner of the air interface of the sidelink.

In this case, after acquiring the indication information, the terminal apparatus adjusts the data transmission mode of the air interface of the sidelink to a broadcast mode, and further generates a scheduling request including the required time-frequency resource according to the transmission requirement of the air interface of the sidelink. After receiving the scheduling request, the first base station determines time-frequency resources required by the terminal device and allocates corresponding time-frequency resources to the terminal device. After the terminal device obtains the time frequency resource allocated to the air interface of the sidelink by the first base station according to the scheduling request, the terminal device performs communication in a broadcasting mode based on the time frequency resource

Through the indication information, the eNB can support the state of the side uplink air interface after adjustment, thereby ensuring that the communication between the terminal devices continues. And through the adjustment mode, the time frequency resource of the air interface of the sidelink is dynamically scheduled by the first base station, so that the conflict between the time frequency resource of the air interface of the sidelink and the time frequency resource applied by the first base station can be avoided, and the communication quality is ensured.

In another possible implementation manner, the adjusting manner is to adjust a functional state of the air interface of the sidelink.

In this case, after acquiring the indication information, the terminal apparatus adjusts the retransmission mechanism and the channel state feedback mechanism to an off state, and further generates a scheduling request including the required time-frequency resource according to the transmission requirement of the air interface of the sidelink. After receiving the scheduling request, the first base station determines time-frequency resources required by the terminal device and allocates corresponding time-frequency resources to the terminal device. And after acquiring the time frequency resource allocated to the air interface of the sidelink by the first base station, the terminal device carries out communication based on the time frequency resource.

Through the indication information, the eNB can support the state of the side uplink air interface after adjustment, thereby ensuring that the communication between the terminal devices continues. Furthermore, through the adjustment mode, the air interface of the side link communicates with other terminal devices in a unicast or multicast mode, and the receiving end can be guaranteed to receive data in a targeted manner.

In the above embodiments, an application scenario is disclosed in which, when the terminal device determines that a handover from the cell of the second base station to the cell of the first base station is required, the first base station obtains the sidelink status information, and generates the indication information according to the sidelink status information. In a practical application scenario, the terminal device may sometimes change from the non-network-resident state to the network-resident state. For example, a terminal device moving from an area of no network coverage to an area of network coverage, or from an area of weaker network signals to an area of stronger network signals, may cause the terminal device to change from an un-camped state to a camped state.

To address this application scenario, the present application also discloses another embodiment. In this embodiment, when the first base station is a long term evolution base station eNB, the determining, by the first base station according to the sidelink status information, whether the first base station supports a current status of a sidelink air interface of the terminal apparatus includes:

When the terminal device changes from the non-network-residing state to the network-residing state, and the time-frequency resource allocation mode of the side link air interface negotiates and allocates the time-frequency resources in the time-frequency resource pool among the terminal devices, the first base station after the terminal device resides in the time-frequency resource allocation mode of the terminal device in the non-network-residing state is usually used, that is, the first base station allocates the time-frequency resource pool for the side link air interface of the terminal device, and the time-frequency resources applied by the first base station in the time-frequency resource pool are determined among the terminal devices in the manner of negotiation and allocation.

However, the time-frequency resource pool applied by the terminal device in the non-network-camping state may conflict with the time-frequency resource pool allocated by the first base station, which may affect the communication of the terminal device. For example, if the transmission time-frequency resource in the time-frequency resource pool allocated by the first base station is different from the transmission time-frequency resource of the terminal device in the non-network-camping state, it may cause that other terminal devices that have previously received the data of the terminal device cannot continue to receive the data transmitted by the terminal device; in addition, if the receiving time-frequency resources in the time-frequency resource pool allocated by the first base station are different from the receiving time-frequency resources of the terminal device in the non-network-camping state, the terminal device may not continuously receive the data transmitted by other terminal devices.

In addition, the time-frequency resource pool applied by the terminal device in the non-network-camping state may also conflict with the time-frequency resource applied by the first base station, for example, when the first base station communicates with each terminal device through the Uu port of the terminal device, the applied time-frequency resource may be included in the time-frequency resource pool.

In this case, the first base station may generate indication information when determining, according to the received sidelink status information, that the time-frequency resource pool when the terminal device is not camped conflicts with the time-frequency resource pool configured for the terminal device, or that the time-frequency resource pool when the terminal device is not camped conflicts with the time-frequency resource applied by the first base station, where the indication information is used to indicate the terminal device to adjust the status of an air interface of the sidelink.

Wherein the sidelink status information comprises at least: and the time frequency resource pool of the side link air interface in the non-network-residing state.

When the sidelink status information only includes the time frequency resource pool of the sidelink air interface in the non-network-residing status, the indication information may instruct the terminal device to adjust the time frequency resource allocation mode of the sidelink air interface to the base station real-time dynamic scheduling. In this case, after receiving the indication information, the terminal apparatus adjusts its time-frequency resource allocation mode to the first mode, that is, the base station after network residence dynamically adjusts the time-frequency resource applied by the side link air interface of the terminal apparatus in the communication process.

Further, when the sidelink status information further includes a data transmission mode and a function status in the non-network-camping state, the first base station may further obtain the data transmission mode and the function status in the non-network-camping state of the terminal device, and in this case, the indication information may further indicate the terminal device to correspondingly adjust the data transmission mode and the function status.

For example, if the first base station is a gbb, the gbb may indicate, through the indication information, that the time-frequency resource allocation mode of the air interface of the sidelink is updated to the base station real-time dynamic scheduling, and update the data transmission mode to a unicast mode or a multicast mode, and activate a retransmission mechanism and/or a channel state feedback mechanism, thereby improving communication quality.

Further, in this embodiment of the application, the transmitting, by the first base station, the indication information includes:

When the terminal device transmits a measurement report to the second base station, the second base station generates sidelink status information of the terminal device and transmits the first base station, and the first base station acquires indication information according to the sidelink status information, transmits the indication information to the second base station, and forwards the indication information to the terminal device, the information interaction process among the terminal device, the second base station, and the first base station may be as shown in fig. 9. The information interaction process comprises the following steps:

a terminal device generates and transmits a measurement report so that the second base station acquires the measurement report;

when the second base station determines that the terminal device needs to be switched from the cell of the second base station to the cell of the first base station according to the measurement report and the network standard of the second base station is different from the network standard of the first base station, the second base station generates and transmits sidelink state information according to the state of a sidelink air interface of the terminal device before cell switching;

the second base station forwards the side link state information to the first base station;

after receiving the sidelink status information, the first base station determines whether the status of an air interface of a sidelink needs to be adjusted according to the sidelink status information, and if so, generates indication information;

the first base station transmits the indication information to a second base station;

after receiving the indication information, the second base station transmits the indication information to a terminal device;

and the terminal device adjusts the state of the air interface of the sidelink according to the adjustment mode of the new indication.

In this case, the state of the air interface of the sidelink of the terminal device can be adjusted to the state supported by the first base station through information interaction among the terminal device, the second base station and the first base station, so as to avoid communication interruption.

Corresponding to the above embodiment, the present application discloses another embodiment, which discloses a communication method with multiple network systems, and referring to the workflow diagram shown in fig. 10, the method includes the following steps:

in step S31, the second base station receives a measurement report from the terminal device.

The second base station is a base station corresponding to a serving cell of the terminal device before the terminal device performs cell handover.

Step S32, the second base station determines whether the network type of the serving cell of the terminal device changes according to the measurement report.

Step S33, when the network type of the serving cell of the terminal device changes, the second base station generates sidelink status information according to the status of the sidelink air interface of the terminal device before cell switching.

In this case, in order to avoid communication interruption due to differences in communication functions of sidelink air interfaces supported by different network systems, the second base station may generate sidelink status information based on a status of the sidelink air interface before cell switching.

And step S34, the second base station transmits the sidelink state information to the first base station.

The first base station is a base station corresponding to a serving cell of the terminal device after the terminal device is subjected to cell switching.

After receiving the sidelink status information transmitted by the second base station, the first base station may determine, based on the sidelink status information, whether the first base station can support a state of a sidelink air interface after cell switching after a network type of a serving cell of the terminal apparatus changes. If the first base station determines that the information can not be supported, corresponding indication information is generated and transmitted to the second base station.

Step S35, the second base station receives, from the first base station, indication information corresponding to the sidelink status information, where the indication information is used to indicate an adjustment manner.

In this embodiment, after obtaining the measurement report transmitted by the terminal device, the second base station may determine whether the terminal device needs to perform cell handover according to the measurement report. When the second base station determines that the terminal device needs to perform cell switching and the network system of the second base station is different from that of the first base station, the second base station may generate corresponding sidelink status information according to the status of a sidelink air interface of the terminal device and transmit the sidelink status information to the first base station.

After receiving the sidelink status information, the first base station analyzes the sidelink status information, and if it is determined that the status of the air interface of the sidelink needs to be adjusted, corresponding indication information is generated, wherein the indication information includes a corresponding adjustment mode. After generating the indication information, the first base station may transmit the indication information to the second base station, and then the second base station transmits the indication information to the terminal device, or the first base station may directly transmit the indication information to the terminal device.

And after receiving the indication information, the terminal device adjusts the state of the uplink air interface according to the adjustment mode indicated by the indication information. In this case, after the terminal apparatus is handed over to the cell of the first base station, the sidelink air interface of the terminal apparatus can still perform communication, thereby solving the problem in the prior art.

When the network type of the serving cell is changed from new radio communication (NR) to Long Term Evolution (LTE), the sidelink status information includes: the side link air interface is in a time frequency resource allocation mode, a data transmission mode and a function state before cell switching;

Further, the second base station may generate the sidelink status information and transmit the sidelink status information to the first base station each time it is determined that the terminal device needs to be handed over from the cell of the second base station to the cell of the first base station. In addition, the second base station may further determine whether the first base station can support the status of the sidelink air interface after determining that the terminal device needs to be handed over from the cell of the second base station to the cell of the first base station, and regenerate the sidelink status information if determining that the terminal device does not support the sidelink air interface. In this case, referring to fig. 11, before the second base station generates the sidelink status information according to the status of the sidelink air interface of the terminal device before cell switching, the method further includes:

step S321, the second base station determines whether the time-frequency resource allocation mode of the air interface of the sidelink is the first mode, if so, performs the operation of step S322, and if not, performs the operation of step S325.

Step S322, when the time-frequency resource allocation mode is the first mode, the second base station determines whether the current data transmission mode of the sidelink air interface is unicast or multicast, if so, performs the operation of step S323, and if not, performs the operation of step S325.

Step S323, when the current data transmission mode of the sidelink air interface is unicast or multicast, the second base station determines whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism, if so, performs the operation of step S324, and if not, performs the operation of step S325.

Step S324, when at least one of the retransmission mechanism and the channel state feedback mechanism is activated, the second base station generates sidelink state information according to the state of the sidelink air interface before cell switching.

Step S325, the second base station determines that the generation of the sidelink status information is not required.

When the second base station is a gbb and the first base station is an eNB, before the cell handover of the terminal device, if the following three conditions are simultaneously satisfied, after the cell handover of the terminal device is completed, the first base station cannot support the state of a sidelink air interface of the terminal device before the cell handover:

In this case, the second base station can determine whether the first base station supports the state of the sidelink air interface of the terminal device before cell switching based on the time-frequency resource allocation mode of the sidelink air interface, the data transmission mode, whether to activate the retransmission mechanism and the channel state feedback mechanism, and transmit the sidelink state information to the first base station under the condition of determining that the sidelink air interface is not supported.

In addition, in an actual application scenario, the execution sequence of step S321 to step S324 is not strictly sequential. For example, the second base station may further determine whether the current data transmission mode of the sidelink air interface is unicast or multicast, if so, determine whether to activate at least one of a retransmission mechanism and a channel state feedback mechanism, and if so, determine whether the time-frequency resource allocation mode of the sidelink air interface is the base station dynamic scheduling. Of course, other execution sequences may be adopted, and the embodiment of the present application is not limited thereto.

In this embodiment, when the second base station determines that the terminal device needs to perform cell handover through the measurement report, the second base station transmits the sidelink status information to the first base station, so that the first base station can acquire the sidelink status information, and instructs the terminal device to perform status adjustment of a sidelink air interface according to the sidelink status information. Under the condition, the terminal device can complete the adjustment of the state of the air interface of the sidelink in the process of cell switching, ensure that the communication of the air interface of the sidelink is not interrupted, and improve the communication efficiency of the air interface of the sidelink.

The following are examples of apparatus disclosed herein that may be used to perform the method embodiments disclosed herein. For details which are not disclosed in the device embodiments of the present application, reference is made to the method embodiments of the present application.

An embodiment of the present application discloses a terminal device, referring to fig. 12, the terminal device includes: a transmitter 110, a receiver 120, and a processor 130.

The processor 130 is configured to generate sidelink status information according to a status of a sidelink air interface before a network status changes when the network status of the terminal device changes, where the change of the network status includes: the network type of the service cell of the terminal device is changed, and/or the terminal device is changed from the network-camping state to the network-camping state;

the transmitter 110, configured to transmit the sidelink status information to the first base station;

the receiver 120 is configured to receive, from the first base station, indication information corresponding to the sidelink status information, where the indication information is used to indicate an adjustment manner;

the processor 130 is further configured to, by the terminal apparatus, adjust a state of the air interface of the sidelink according to the adjustment manner, so that the terminal apparatus performs communication through the adjusted air interface of the sidelink.

The transmitter 110 may transmit the sidelink status information to the first base station, and the first base station may determine, based on the sidelink status information, whether the first base station can support a status of a sidelink air interface after the network status of the terminal apparatus changes. If the first base station determines that the information cannot be supported, corresponding indication information is generated and transmitted so that the receiver 120 can acquire the indication information.

The indication information is used for indicating an adjustment mode, and the adjustment mode corresponds to a state of a sidelink air interface which can be supported by the first base station. After receiving the indication information, the terminal apparatus adjusts the state of the air interface of the sidelink according to the adjustment manner, that is, after adjusting according to the adjustment manner, the first base station can support the adjusted state of the air interface of the sidelink. In this case, after the network type of the terminal device is changed, communication can be performed over the adjusted sidelink air interface.

By the device disclosed by the embodiment of the application, if the network state of the terminal device changes, the terminal device can adjust the state of the air interface of the sidelink, so that the adjusted air interface of the sidelink can communicate through the adjusted air interface of the sidelink after the network state changes, the problem of communication interruption between the terminal devices is avoided, and the problem of the prior art is solved.

The transmitter 110, the receiver 120, and the processor 130 in the embodiments of the present application may be implemented in various ways. The transmitter 110 may be a transmitting unit, or may be another module having a transmitting function; the receiver 120 may be a receiving unit, or may also be another module having a receiving function; the processor 130 may be a processing unit, or may be another module having a processing function.

When the terminal device needs to be switched from the cell of the second base station to the cell of the first base station, and the network type of the second base station is different from the network type of the first base station, the network type of the serving cell of the terminal device changes, and in this case, the processor 130 determines that the network state of the terminal device changes.

In this embodiment of the present application, when the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE, the sidelink status information includes: the side link air interface is in a time frequency resource allocation mode, a data transmission mode and a function state before cell switching;

In the embodiment of the application, the terminal device can generate and transmit the sidelink status information each time when the terminal device determines that the network status of the terminal device changes. In addition, the terminal device may further determine whether the air interface state of the sidelink needs to be adjusted after determining that the network state of the terminal device changes, and generate the sidelink state information only when the air interface state of the sidelink needs to be adjusted. In this case, when the network type of the serving cell of the terminal apparatus changes and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE, the processor is further configured to determine whether a time-frequency resource allocation mode of the sidelink air interface is a first mode;

That is, when the processor 130 determines that the terminal device satisfies the following three conditions at the same time, the operation of generating the sidelink status information is re-executed:

In this embodiment of the application, after receiving the indication information, the terminal apparatus may adjust the state of the uplink air interface based on an adjustment manner included in the indication information, and according to a difference of the indication information, the adjustment manner of the state of the uplink air interface also includes multiple manners.

In one of the feasible adjustment manners, when the adjustment manner is to adjust a time-frequency resource allocation mode of the sidelink air interface, the processor is specifically configured to determine a time-frequency resource pool included in the indication information, and determine self-applicable time-frequency resources in the time-frequency resource pool, so as to perform communication through the self-applicable time-frequency resources in the time-frequency resource pool;

Through the adjustment, the eNB can support the state after the air interface of the sidelink is adjusted, so that the communication between the terminal devices is ensured to be continued.

Or, the terminal device may further separately generate a time-frequency resource report message including the first sending time-frequency resource and the first receiving time-frequency resource, and transmit the time-frequency resource report message to the first base station, so that the first base station obtains the first sending time-frequency resource and the first receiving time-frequency resource through the time-frequency resource report message.

In another feasible adjustment manner, when the adjustment manner is to adjust the data transmission manner of the sidelink air interface, the processor is specifically configured to adjust the data transmission manner of the sidelink air interface to a broadcast manner, generate a scheduling request including a required time-frequency resource according to a transmission requirement of the sidelink air interface, transmit the scheduling request to the first base station, and determine the time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication in a broadcast manner according to the time-frequency resource.

In another feasible adjustment manner, when the adjustment manner is to adjust the functional state of the sidelink air interface, the processor is specifically configured to adjust a retransmission mechanism and a channel state feedback mechanism to an off state, generate a scheduling request including a required time-frequency resource according to a transmission requirement of the sidelink air interface, transmit the scheduling request to the first base station, and determine the time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication according to the time-frequency resource.

In addition, when the terminal device changes from the non-network-camping state to the network-camping state, the processor is further configured to determine whether a time-frequency resource allocation mode of the sidelink air interface is that the terminal device determines a time-frequency resource applicable to itself in a time-frequency resource pool;

When the base station of the terminal device which is in the network determines that the time frequency resource pool of the terminal device which is not in the network conflicts with the time frequency resource pool configured for the terminal device or determines that the time frequency resource pool of the terminal device which is not in the network conflicts with the time frequency resource applied by the base station, indicating information can be generated, and the indicating information is used for indicating the terminal device to adjust the state of the air interface of the side link.

Further, the transmitter is further configured to transmit a measurement report to a second base station, so that after receiving the measurement report, the second base station determines whether the terminal device needs to perform cell handover.

Accordingly, the present application discloses another embodiment, which discloses a first base station, referring to fig. 13, the first base station includes: a transmitter 210, a receiver 220, and a processor 230.

The receiver 220 is configured to receive sidelink status information of a terminal device;

the processor 230 is configured to determine whether the processor supports the current state of the sidelink air interface of the terminal apparatus according to the sidelink state information, and generate indication information when the processor does not support the current state of the sidelink air interface of the terminal apparatus, where the indication information is used to indicate an adjustment mode;

the transmitter 210 is configured to transmit the indication information to the terminal device.

When the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE, the processor is specifically configured to determine whether a current time-frequency resource allocation mode of the sidelink air interface is base station dynamic scheduling according to a time-frequency resource allocation mode included in the sidelink status information;

when the terminal device activates a retransmission mechanism and/or a channel state feedback mechanism, the processor determines that the processor does not support the current state of a sidelink air interface of the terminal device.

That is to say, when the second base station is a gNB and the first base station is an eNB, the third processor 330 determines that the terminal apparatus does not support the current state of the sidelink air interface of the terminal apparatus before cell handover when the following three conditions are simultaneously satisfied:

Further, when the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from the new radio communication NR to LTE, the adjustment manner is to adjust a time-frequency resource allocation mode of the air interface of the sidelink, and the indication information includes a time-frequency resource pool, a transmission time-frequency resource in the time-frequency resource pool is in a first transmission time-frequency resource, a reception time-frequency resource in the time-frequency resource pool is the same as a first reception time-frequency resource, the first transmission time-frequency resource is a transmission time-frequency resource of the air interface of the sidelink before adjustment, and the first reception time-frequency resource is a reception time-frequency resource of the air interface of the sidelink before adjustment;

Further, when the first base station is a long term evolution base station eNB, the processor is specifically configured to determine, when the terminal device camps on a network to the first base station, whether a time-frequency resource pool of the sidelink air interface included in the sidelink status information in a non-camped state conflicts with a time-frequency resource pool allocated to the terminal device by itself, and/or conflicts with a time-frequency resource applied by itself;

In addition, the transmitter is specifically configured to transmit the indication information to a second base station when the terminal device is handed over from a cell of the second base station to a cell of the first base station, so that the second base station forwards the indication information to the terminal device.

The transmitter 210, the receiver 220, and the processor 230 in the embodiments of the present application may be implemented in various ways. Illustratively, the transmitter 210 may be a transmitting unit, or may be another module having a transmitting function; the receiver 220 may be a receiving unit, or may also be another module having a receiving function; the processor 230 may be a processing unit, or may be another module having a processing function.

Accordingly, the present application also discloses another embodiment, which discloses a second base station, referring to fig. 14, including: a transmitter 310, a receiver 320, and a processor 330.

The receiver 320 is configured to receive a measurement report of a terminal device.

The processor 330 is configured to determine whether a network type of a serving cell of the terminal device changes according to the measurement report, and generate sidelink status information according to a status of a sidelink air interface of the terminal device before cell switching when the network type of the serving cell of the terminal device changes.

When the processor 330 determines that the network type of the serving cell of the terminal device changes according to the measurement report, the processor 330 generates sidelink status information according to the status of the sidelink air interface of the terminal device before cell switching.

When the terminal device needs to be switched from the cell of the second base station to the cell of the first base station and the network standard of the second base station is different from the network standard of the first base station, it indicates that the network standard of the serving cell of the terminal device changes.

After receiving the sidelink status information transmitted by the second base station, the first base station may determine, based on the sidelink status information, whether the first base station can support a state of a sidelink air interface after cell handover after the network state of the terminal device changes. If the first base station determines that the information can not be supported, corresponding indication information is generated and transmitted to the second base station. The first base station is a base station corresponding to a serving cell of the terminal device after the terminal device is subjected to cell switching.

The transmitter 310 is configured to transmit the sidelink status information to the first base station.

The receiver 320 is further configured to receive, from the first base station, indication information corresponding to the sidelink status information, where the indication information is used to indicate an adjustment manner.

The transmitter 310 is further configured to transmit the indication information to the terminal device.

Further, the second base station may generate the sidelink status information and transmit the sidelink status information to the first base station each time it is determined that the terminal device needs to be handed over from the cell of the second base station to the cell of the first base station. In addition, the second base station may further determine whether the first base station can support the status of the sidelink air interface after determining that the terminal device needs to be handed over from the cell of the second base station to the cell of the first base station, and regenerate the sidelink status information if determining that the terminal device does not support the sidelink air interface.

In this case, the processor 330 is further configured to determine whether a time-frequency resource allocation mode of the air interface of the sidelink is a first mode;

That is, when the second base station is the gNB and the first base station is the eNB, the processor 330 determines that the terminal apparatus regenerates the sidelink status information before the cell handover if the following three conditions are satisfied simultaneously:

The transmitter 310, the receiver 320 and the processor 330 in the embodiments of the present application may be implemented in various ways. The transmitter 310 may be a transmitting unit, or may be another module having a transmitting function; the receiver 320 may be a receiving unit, or may also be another module having a receiving function; the processor 330 may be a processing unit, or may be another module having a processing function.

Correspondingly, an embodiment of the present application further discloses a terminal device, referring to a schematic structural diagram shown in fig. 15, where the terminal device includes:

a processor 1101 and a memory, wherein the memory,

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so as to cause the terminal device to perform all or part of the steps in the embodiments corresponding to fig. 1 and fig. 3 to fig. 5.

Further, the terminal device may further include: a transceiver 1102 and a bus 1103 that includes a random access memory 1104 and a read only memory 1105.

The processor is coupled to the transceiver, the random access memory and the read only memory through the bus respectively. When the terminal device needs to be operated, the terminal device is guided to enter a normal operation state by starting a basic input and output system solidified in a read only memory or a bootloader guiding system in an embedded system. After the terminal device enters a normal operation state, an application program and an operating system are operated in the random access memory, so that the terminal device executes all or part of the steps in the embodiments corresponding to fig. 1 and fig. 3 to fig. 5.

The communication device in the embodiment of the present invention may correspond to the terminal device in the embodiment corresponding to fig. 1 and fig. 3 to fig. 5, and the processor, the transceiver, and the like in the terminal device may implement the functions of the terminal device and/or various steps and methods implemented in the embodiment corresponding to fig. 1 and fig. 3 to fig. 5, which are not described herein again for brevity.

It should be noted that, in this embodiment, the terminal device may also be implemented based on a general physical server and a Network Function Virtualization (NFV) technology, where the terminal device is a virtual terminal device (e.g., a virtual host, a virtual router, or a virtual switch). The Virtual terminal device may be a Virtual Machine (VM) running a program for sending an announcement message function, and the VM is deployed on a hardware device (e.g., a physical server). A virtual machine refers to a complete computer system with complete hardware system functionality, which is emulated by software, running in a completely isolated environment. A person skilled in the art can virtually simulate a plurality of communication devices with the above functions on a general physical server by reading the application. And will not be described in detail herein.

Correspondingly, the embodiment of the present application further discloses a first base station, where the first base station includes:

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so that the first base station performs all or part of the steps in the embodiments corresponding to fig. 7 to 8.

Further, the first base station may further include: a transceiver and a bus, the memory including random access memory and read only memory.

The processor is coupled to the transceiver, the random access memory and the read only memory through the bus respectively. When the communication device needs to be operated, the first base station is guided to enter a normal operation state by starting a basic input and output system solidified in a read only memory or a bootloader guiding system in an embedded system. After the first base station enters a normal operation state, an application program and an operating system are operated in a random access memory, so that the first base station executes all or part of the steps in the embodiments corresponding to fig. 7 to 8.

The communication device according to the embodiment of the present invention may correspond to the first base station in the embodiment corresponding to fig. 7 to 8, and the processor, the transceiver, and the like in the communication device may implement the functions of the first base station and/or various steps and methods implemented in the embodiment corresponding to fig. 7 to 8, which are not described herein again for brevity.

Correspondingly, the embodiment of the present application further discloses a second base station, where the second base station includes:

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so that the second base station performs all or part of the steps in the embodiments corresponding to fig. 10 to fig. 11.

Further, the second base station may further include: a transceiver and a bus, the memory including random access memory and read only memory.

The processor is coupled to the transceiver, the random access memory and the read only memory through the bus respectively. When the communication device needs to be operated, the second base station is guided to enter a normal operation state by starting a basic input and output system solidified in a read only memory or a bootloader guiding system in an embedded system. After the second base station enters the normal operation state, the application program and the operating system are operated in the random access memory, so that the second base station executes all or part of the steps in the embodiments corresponding to fig. 10 to 11.

The second base station in the embodiment of the present invention may correspond to the second base station in the embodiment corresponding to fig. 10 to fig. 11, and the processor, the transceiver, and the like in the communication device may implement the functions of the second base station and/or various steps and methods implemented in the embodiment corresponding to fig. 10 to fig. 11, which are not described herein again for brevity.

In a specific implementation, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium has instructions stored therein, and when the instructions are executed on a computer, the computer may be caused to implement all or part of the steps in the embodiments corresponding to fig. 1 and fig. 3 to fig. 5. The computer-readable storage medium is provided in any device, which may be a random-access memory (RAM), and the memory may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); the memory may also comprise a combination of the above kinds of memories, etc.

In a specific implementation manner, an embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer may be caused to implement all or part of the steps in the embodiments corresponding to fig. 7 to 8. The computer-readable storage medium is provided in any device, which may be a random-access memory (RAM), and the memory may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); the memory may also comprise a combination of the above kinds of memories, etc.

In a specific implementation manner, an embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer may be caused to implement all or part of the steps in the embodiments corresponding to fig. 10 to fig. 11. The computer-readable storage medium is provided in any device, which may be a random-access memory (RAM), and the memory may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); the memory may also comprise a combination of the above kinds of memories, etc.

Those of skill in the art will further appreciate that the various illustrative logical blocks and steps (step) set forth in the embodiments of the present application may be implemented in electronic hardware, computer software, or combinations of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

The various illustrative logical units and circuits described in this application may be implemented or operated upon by design of a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be located in a UE. In the alternative, the processor and the storage medium may reside in different components in the UE.

It should be understood that, in the various embodiments of the present application, the size of the serial number of each process does not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

All parts of the specification are described in a progressive mode, the same and similar parts of all embodiments can be referred to each other, and each embodiment is mainly introduced to be different from other embodiments. In particular, as to the apparatus and system embodiments, since they are substantially similar to the method embodiments, the description is relatively simple and reference may be made to the description of the method embodiments in relevant places.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.

The same and similar parts in the various embodiments in this specification may be referred to each other. Especially, for the … … embodiment, since it is basically similar to the method embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.

Claims

1. A communication method under multiple network systems is characterized by comprising the following steps:

2. The method of claim 1,

when the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from the new radio communication NR to the long term evolution LTE, the sidelink status information includes: the side link air interface is in a time frequency resource allocation mode, a data transmission mode and a function state before cell switching;

3. The method of claim 2, further comprising:

4. The method according to claim 2 or 3, wherein when the adjustment mode is adjusting the time-frequency resource allocation mode of the air interface of the sidelink, the adjusting, by the terminal device, the state of the air interface of the sidelink according to the adjustment mode includes:

5. The method of claim 4,

the sidelink status information further comprises the first sending time-frequency resource and the first receiving time-frequency resource;

6. The method according to claim 2 or 3, wherein when the adjustment mode is adjusting the data transmission mode of the air interface of the sidelink, the adjusting, by the terminal device, the state of the air interface of the sidelink according to the adjustment mode includes:

7. The method according to claim 2 or 3, wherein when the adjustment mode is adjusting the functional state of the air interface of the sidelink, the adjusting, by the terminal device, the state of the air interface of the sidelink according to the adjustment mode includes:

8. The method of claim 1, further comprising:

9. The method of claim 8,

the sidelink status information comprises at least: and the time frequency resource pool of the side link air interface in the non-network-residing state.

10. The method of any one of claims 1 to 9, further comprising:

the terminal device transmits a measurement report to a second base station.

11. A communication method under multiple network systems is characterized by comprising the following steps:

12. The method of claim 11, wherein when the network type of the serving cell of the terminal device changes and the network type of the serving cell changes from new radio communication NR to long term evolution LTE, the determining, by the first base station, whether or not the first base station supports a current status of a sidelink air interface of the terminal device according to the sidelink status information comprises:

13. The method of claim 12, wherein when the network standard of the serving cell of the terminal device changes and the network standard of the serving cell changes from the new radio communication NR to LTE,

14. The method according to claim 11, wherein when the first base station is a long term evolution base station eNB, the determining, by the first base station according to the sidelink status information, whether or not the first base station supports a current status of a sidelink air interface of the terminal apparatus includes:

15. The method according to any of claims 11 to 14, wherein the first base station transmits the indication information, comprising:

16. A communication method under multiple network systems is characterized by comprising the following steps:

the second base station receiving a measurement report of the terminal device;

17. The method of claim 16,

18. The method of claim 17, further comprising:

19. A terminal device, comprising:

20. The terminal apparatus according to claim 19,

21. The terminal device according to claim 20,

the processor is further configured to determine whether a time-frequency resource allocation mode of the sidelink air interface is a first mode;

22. A terminal device according to claim 20 or 21,

when the adjustment mode is to adjust the time-frequency resource allocation mode of the air interface of the sidelink, the processor is specifically configured to determine a time-frequency resource pool included in the indication information, and determine self-applicable time-frequency resources in the time-frequency resource pool, so as to perform communication through the self-applicable time-frequency resources in the time-frequency resource pool;

23. The terminal device according to claim 22,

24. The terminal apparatus according to claim 20 or 21, wherein when the adjustment manner is adjusting a data transmission manner of the sidelink air interface, the processor is specifically configured to adjust the data transmission manner of the sidelink air interface to a broadcast manner, generate a scheduling request including a required time-frequency resource according to a transmission requirement of the sidelink air interface, transmit the scheduling request to the first base station, and determine the time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication in a broadcast manner according to the time-frequency resource.

25. The terminal apparatus according to claim 20 or 21, wherein when the adjustment manner is to adjust the functional state of the sidelink air interface, the processor is specifically configured to adjust a retransmission mechanism and a channel state feedback mechanism to an off state, generate a scheduling request including a required time-frequency resource according to a transmission requirement of the sidelink air interface, transmit the scheduling request to the first base station, and determine the time-frequency resource allocated by the first base station according to the scheduling request, so as to perform communication according to the time-frequency resource.

26. The terminal apparatus according to claim 19,

when the terminal device changes from the non-network-camping state to the network-camping state, the processor is further configured to determine whether a time-frequency resource allocation mode of the sidelink air interface is a time-frequency resource that can be applied to the terminal device in a time-frequency resource pool;

27. The terminal device according to claim 26,

28. A terminal device according to any of claims 19 to 21,

the transmitter is further configured to transmit a measurement report to the second base station.

29. A first base station, comprising:

a receiver for receiving sidelink status information of a terminal device;

30. The first base station of claim 29,

31. The first base station of claim 30,

when the network system of the serving cell of the terminal device changes and the network system of the serving cell changes from the new radio communication NR to the long term evolution LTE,

32. The first base station of claim 29, wherein when the first base station is a long term evolution base station eNB, the processor is specifically configured to, when the terminal apparatus camps on a network to the first base station, determine whether a time-frequency resource pool of the sidelink air interface included in the sidelink status information in a non-camping state conflicts with a time-frequency resource pool allocated to the terminal apparatus by itself, and/or conflicts with a time-frequency resource applied by itself;

33. The first base station according to any of claims 29 to 32, wherein the transmitter is specifically configured to transmit the indication information to the second base station when the terminal device is handed over from the cell of the second base station to the cell of the first base station, so that the second base station forwards the indication information to the terminal device.

34. A second base station, comprising:

a receiver for receiving a measurement report of a terminal device;

35. The second base station of claim 34,

36. The second base station of claim 35,

37. A terminal device, comprising:

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so as to enable the communication apparatus to execute the communication method in the multi-network system according to any one of claims 1 to 10.

38. A first base station, comprising:

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so as to enable the communication apparatus to execute the communication method in the multi-network system according to any one of claims 11 to 14.

39. A second base station, comprising:

the memory to store program instructions;

the processor is configured to call and execute the program instructions stored in the memory, so as to cause the communication apparatus to execute the communication method in the multi-network system according to any one of claims 15 to 18.

40. A computer-readable storage medium, characterized in that,

the computer-readable storage medium has stored therein instructions that, when executed on a computer, cause the computer to execute a communication method in a multi-network system according to any one of claims 1 to 10.

41. A computer-readable storage medium, characterized in that,

the computer-readable storage medium has stored therein instructions that, when executed on a computer, cause the computer to execute a communication method in a multi-network system according to any one of claims 11 to 15.

42. A computer-readable storage medium, characterized in that,

the computer-readable storage medium has stored therein instructions that, when executed on a computer, cause the computer to execute a communication method in a multi-network system according to any one of claims 16 to 18.