CN114828158A

CN114828158A - Information transmission method, device, base station and medium

Info

Publication number: CN114828158A
Application number: CN202110088187.5A
Authority: CN
Inventors: 孙建成; 傅婧
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2022-07-29
Anticipated expiration: 2041-01-22
Also published as: CN114828158B; WO2022156439A1

Abstract

The invention provides an information transmission method, an information transmission device, a base station and a medium, which solve the problem that how a base station side processes the transmission of uplink small data when a terminal in an inactive state transmits the small data in the prior art so that the terminal does not need to enter a connected state. The method comprises the following steps: the method comprises the steps that a first base station sends a first request message for requesting to acquire context information of a first terminal to a second base station, the first terminal is a terminal in an inactive state, the first request message comprises first indication information for indicating that uplink small data exist and waiting to be transmitted, and a first response message which is sent by the second base station and comprises the context information of the first terminal and second indication information for indicating anchor point to keep is received; and transmitting the uplink data to the second base station. When the terminal in the inactive state transmits small data, the anchor base station indicates the anchor to keep through the indication information, so that the terminal does not need to restore the connection state, the data transmission process is simplified, the transmission efficiency is improved, and the resource waste caused by the signaling overhead is avoided.

Description

Information transmission method, device, base station and medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an information transmission method, an information transmission apparatus, a base station, and a medium.

Background

In the prior art, when a terminal in a radio resource control inactive RRC _ inactive state needs to perform uplink data transmission, a connection recovery process needs to be initiated to return to an RRC connected state, and then uplink and downlink data transmission is performed. For terminals that need to transmit only a small amount of data, even one uplink data packet, the connection recovery procedure is initiated to return to the RRC connected state.

When a terminal in an RRC _ inactive state transmits small data, how a base station side handles transmission of the uplink small data, so that the terminal does not need to enter a connected state, thereby simplifying a data transmission process and improving transmission efficiency.

Disclosure of Invention

The present invention provides an information transmission method, apparatus, base station and medium, which are used to solve the problem in the prior art that when a terminal in an RRC _ inactive state transmits small data, how a base station side handles the transmission of the uplink small data, so that the terminal does not need to enter a connected state.

In order to achieve the above object, an embodiment of the present invention provides an information transmission method, including:

a first base station sends a first request message to a second base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

the first base station receives a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance;

and the first base station sends the uplink data to the second base station.

Wherein the first request message further comprises: assistance information comprising at least one of:

the third indication information is used for indicating whether uplink small data to be transmitted exist subsequently or not;

and the fourth indication information is used for indicating whether the expected downlink small data is to be transmitted or not.

The first indication information is obtained based on a cause value in the connection recovery request message, or the first indication information is obtained by the first base station based on the uplink data.

Wherein when the first base station comprises a distribution unit and a concentration unit;

before the first base station sends the first request message to the second base station, the method further includes:

the distribution unit receives the connection recovery request message and the uplink data sent by the first terminal;

the distribution unit caches the uplink data and sends a first signaling transmission message to the concentration unit, wherein the first signaling transmission message comprises fifth indication information and/or the data volume of the uplink data to be transmitted, and the fifth indication information is used for indicating that the uplink data to be transmitted exist.

Wherein the first signaling transmission message is an initial uplink radio resource control message transmission message.

Before the first base station sends the uplink data to the second base station, the method further includes:

receiving a first notification message sent by the second base station, where the first notification message includes forwarding tunnels respectively allocated by the second base station to at least one data radio bearer for uplink small data transmission corresponding to the first terminal based on the context information of the first terminal;

the sending, by the first base station, the uplink data to the second base station includes:

and sending the uplink data to the second base station through a first forwarding tunnel, wherein the first forwarding tunnel is a forwarding tunnel corresponding to a data radio bearer for transmitting the uplink data.

Wherein the method further comprises:

and sending a second notification message to the second base station, where the second notification message includes forwarding tunnels respectively allocated by the first base station to at least one data radio bearer for downlink small data transmission of the first terminal.

Wherein the method further comprises:

receiving downlink data sent by the second base station through a second forwarding tunnel, wherein the second forwarding tunnel is a forwarding tunnel corresponding to a data radio bearer for transmitting the downlink data;

and sending the downlink data to the first terminal.

Wherein the method further comprises:

after small data transmission is completed, receiving a second message sent by a second base station, wherein the second message carries a radio resource control release message, and the radio resource control release message is generated by the second base station;

and sending the radio resource control release message to the first terminal, and releasing the context information of the first terminal.

Wherein, the second message is a terminal context release command message.

In order to achieve the above object, an embodiment of the present invention further provides an information transmission method, including:

a second base station receives a first request message sent by a first base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data to be transmitted exists, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

the second base station sends a first response message to the first base station, wherein the first response message comprises the context information of the first terminal and second indication information used for indicating anchor point maintenance;

and the second base station receives the uplink data sent by the first base station.

Wherein after the second base station sends the first response message to the first base station, the method further comprises:

respectively allocating forwarding tunnels for at least one data radio bearer for uplink small data transmission corresponding to the first terminal based on the context information of the first terminal;

sending a first notification message to the first base station, wherein the first notification message comprises a forwarding tunnel distributed for the first terminal;

the second base station receiving the uplink data sent by the first base station, including:

and receiving the uplink data sent by the first base station through a first forwarding tunnel, wherein the first forwarding tunnel is a forwarding tunnel corresponding to a data radio bearer for transmitting the uplink data.

Wherein the method further comprises:

and receiving a second notification message sent by the first base station, where the second notification message includes forwarding tunnels respectively allocated by the first base station to at least one data radio bearer for downlink small data transmission of the first terminal.

Wherein the method further comprises:

and sending the downlink data to the first base station through a second forwarding tunnel under the condition of receiving the downlink data, wherein the second forwarding tunnel is a forwarding tunnel corresponding to a data radio bearer for transmitting the downlink data.

Wherein the method further comprises:

generating a radio resource control release message after the small data transmission is completed;

and sending a second message to the first base station, wherein the second message carries a radio resource control release message.

Wherein, the second message is a terminal context release command message.

In order to achieve the above object, an embodiment of the present invention further provides a base station, where the base station is a first base station, and the base station includes: memory, transceiver, processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

sending a first request message to a second base station through a transceiver, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data are to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

receiving a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance;

and sending the uplink data to the second base station.

In order to achieve the above object, an embodiment of the present invention further provides an information transmission apparatus, applied to a first base station, including:

a first sending unit, configured to send a first request message to a second base station, where the first request message is used to request to acquire context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is an anchor base station that is determined by the first base station based on the connection recovery request message;

a first receiving unit, configured to receive a first response message sent by the second base station, where the first response message includes context information of the first terminal and second indication information for indicating anchor point maintenance;

a second sending unit, configured to send the uplink data to the second base station.

In order to achieve the above object, an embodiment of the present invention further provides a base station, where the base station is a second base station, and the base station includes: memory, transceiver, processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

receiving, by the transceiver, a first request message sent by a first base station, where the first request message is used to request to acquire context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

sending a first response message to the first base station, wherein the first response message comprises context information of the first terminal and second indication information for indicating anchor point maintenance;

and receiving the uplink data sent by the first base station.

In order to achieve the above object, an embodiment of the present invention further provides an information transmission apparatus, which is applied to a second base station, and includes:

a fifth receiving unit, configured to receive a first request message sent by a first base station, where the first request message is used to request to acquire context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is an anchor base station that is determined by the first base station based on the connection recovery request message;

a sixth sending unit, configured to send a first response message to the first base station, where the first response message includes context information of the first terminal and second indication information indicating that an anchor point is maintained;

a sixth receiving unit, configured to receive the uplink data sent by the first base station.

In order to achieve the above object, an embodiment of the present invention further provides a processor-readable storage medium, where a computer program is stored, where the computer program is used to enable the processor to execute the steps of the information transmission method described above.

The technical scheme of the invention at least has the following beneficial effects:

in the technical solution of the embodiment of the present invention, a first request message is sent to a second base station through a first base station, where the first request message is used to request to obtain context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is a base station anchor point determined by the first base station based on the connection recovery request message; the first base station receives a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance; the first base station sends the uplink data to the second base station, so that when the terminal in the inactive state transmits small data, the anchor base station indicates the anchor to be kept through the indication information, namely the anchor is not transferred, the terminal can be enabled not to restore the connection state, the terminal can realize the transmission of the small data in the inactive state, thereby simplifying the data transmission process, improving the transmission efficiency, and avoiding the resource waste caused by signaling overhead especially under the condition that the terminal moves to other base stations or other centralized units CU.

Drawings

Fig. 1 is a flowchart illustrating an information transmission method according to an embodiment of the present invention;

fig. 2 is a second schematic flow chart of an information transmission method according to an embodiment of the present invention;

fig. 3 is a third schematic flow chart of an information transmission method according to an embodiment of the present invention;

FIG. 4 is a fourth flowchart illustrating an information transmission method according to an embodiment of the present invention;

fig. 5 is a block diagram of a base station according to an embodiment of the present invention;

FIG. 6 is a block diagram of an information transmission apparatus according to an embodiment of the present invention;

fig. 7 is a second block diagram of a base station according to the second embodiment of the present invention;

fig. 8 is a block diagram of an information transmission apparatus according to an embodiment of the present invention.

Detailed Description

The term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

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

The embodiment of the application provides an information transmission method, an information transmission device, a base station and a medium, which are used for solving the problem that how a base station side processes the transmission of uplink small data when a terminal in an RRC _ inactive state transmits the small data in the prior art so that the terminal does not need to enter a connected state. The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

As shown in fig. 1, which is a schematic flow chart of an information transmission method provided in an embodiment of the present invention, the method is applied to a first base station, and includes:

step 101: a first base station sends a first request message to a second base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data to be transmitted exists, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

in this step, the first base station and the second base station may include a CU (Centralized Unit) and a DU (Distributed Unit) based on a CU split architecture, or may be base stations in a non-split architecture.

Here, before this step, the first base station receives the connection restoration request message and the uplink data transmitted by the first terminal. The first terminal is in an inactive state. That is, the corresponding scenario for implementing the method is that the terminal is in an inactive state and data transmission is performed between base stations.

It should be noted that the first base station is a serving base station, and the second base station is an anchor base station.

Here, after receiving the connection recovery request message sent by the first terminal, the first base station finds the anchor base station according to a User Equipment (UE) ID Identifier, such as an I-RNTI (Inactive radio Network Temporary Identifier) in the connection recovery request message.

Here, since the first indication information is used to indicate that there is uplink small data to be transmitted, it is described that the first base station knows that the uplink data sent by the first terminal is the uplink small data. It should be noted that, by small data, it is understood that the data amount of the data to be transmitted is smaller than the preset data amount, for example, the size of the data packet is smaller and/or the number of the data packets is smaller.

Step 102: the first base station receives a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance;

in this step, anchor hold is understood to mean anchor not changed or anchor not transferred. It should be noted that the second base station, i.e. the anchor base station, can decide whether to keep the anchor unchanged.

Here, the second indication information may be determined by the first indication information, may be determined by the first indication information and other auxiliary information together, may also be determined independently of the first indication information and other auxiliary information, and is not limited specifically here.

Step 103: and the first base station sends the uplink data to the second base station.

In this step, since the second base station indicates the anchor point to be maintained in the previous step, additional signaling interaction is performed between the base station and the first terminal without restoring the connection state for the first terminal, so that resource waste caused by signaling overhead is avoided, the first base station directly sends uplink data to the second base station, and the second base station subsequently transmits the uplink data to the core network side.

The information transmission method of the embodiment of the invention comprises the steps that a first request message is sent to a second base station through a first base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is a base station anchor point which is determined by the first base station based on the connection recovery request message; the first base station receives a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance; the first base station sends the uplink data to the second base station, so that when the terminal in the inactive state transmits small data, the anchor base station indicates the anchor to be kept through the indication information, namely the anchor is not transferred, the terminal can be enabled not to restore the connection state, the terminal can realize the transmission of the small data in the inactive state, thereby simplifying the data transmission process, improving the transmission efficiency, and avoiding the resource waste caused by signaling overhead especially under the condition that the terminal moves to other base stations or other centralized units CU.

Optionally, the first request message further includes: assistance information comprising at least one of:

That is, the first request message includes the first indication information, or the first request message includes the first indication information and the assistance information.

Here, the auxiliary information includes, but is not limited to, the third indication information and the fourth indication information described above. It should be explained that the third indication information is used to indicate whether uplink small data is to be transmitted subsequently, where the subsequent is after the current uplink data transmission.

It should be noted that the second indication information may be determined by the first indication information, or may be determined by both the first indication information and the auxiliary information, and of course, the second indication information may also be determined independently of the first indication information and the auxiliary information.

Optionally, the first indication information is obtained based on a cause value in the connection recovery request message, or the first indication information is obtained by the first base station based on the uplink data.

It should be noted that, a cause parameter is newly added in the connection recovery request message to indicate the cause of the current connection recovery request. The values of the cause parameters, that is, the causes indicating the current connection recovery request corresponding to different cause values, are also different.

For the case that the first indication information is obtained based on the cause value in the connection recovery request message, the cause value in the connection recovery request message is used to indicate that the reason for the current connection recovery request is that the first terminal needs to transmit the uplink small data.

Here, for the case where the first indication information is obtained by the first base station based on the uplink data:

when the first base station is a base station under a non-separated architecture, the first base station receives uplink data sent by the first terminal, and the first base station can determine that the uplink data sent by the first terminal is uplink small data, so that the first indication information is obtained.

Under the condition that the first base station is a CU and a DU based on a CU-DU separation architecture, the CU receives a connection recovery request message and uplink data sent by a first terminal through the DU corresponding to the CU, wherein the DU can determine that the uplink data sent by the first terminal is uplink small data and inform the uplink small data to the CU, so that the CU can obtain first indication information; if the connection recovery request message includes a cause value for indicating that the reason for the current connection recovery request is that the first terminal needs to transmit the uplink small data, the DU transmits the connection recovery request message and a message for determining that the uplink data sent by the first terminal is the uplink small data to the CU, so that the CU obtains the first indication information.

Optionally, the first indication information indicates the indication or the cause value indicates the indication through an interface.

As an optional implementation manner, when the first base station includes a distribution unit and a concentration unit;

it should be noted that this implementation corresponds to a scenario in which the first base station includes a CU and a DU based on the CU-DU separation architecture.

The distribution unit caches the uplink data and sends a first signaling transmission message to the central unit, wherein the first signaling transmission message comprises fifth indication information and/or the data volume of the uplink data to be transmitted, and the fifth indication information is used for indicating that the uplink data to be transmitted exist.

Here, the distribution unit DU can determine the data size of the uplink data transmitted by the first terminal, and can determine whether the uplink data transmitted by the first terminal is uplink small data.

And when the DU determines that the uplink data sent by the first terminal is the uplink small data, the fifth indication information is used for indicating that the uplink small data is to be transmitted.

It should be noted that, the central unit CU can know whether the uplink data sent by the first terminal is uplink small data according to the first signaling transmission message.

It should be noted that the DU in the first base station sends the received connection recovery request message to the CU in the first base station.

After receiving a connection recovery request message sent by a first terminal, a CU in a first base station finds a CU in a second base station, namely an anchor CU, according to a UE ID (user equipment) identifier in the connection recovery request message, such as an I-RNTI (identity-radio network temporary identifier).

Optionally, the first signaling transmission message is an initial uplink radio resource control message transmission message.

Here, optionally, the connection resumption request message is encapsulated in the initial uplink radio resource control message transmission message.

It should be noted that, if the connection recovery request message includes a cause value used for indicating the current connection recovery request, the CU learns whether the uplink data sent by the first terminal is uplink small data according to the fifth indication information in the connection recovery request message and the first signaling transmission message and/or the data size of the uplink data to be transmitted.

In order to complete transmission of uplink data sent by the first terminal, as an optional implementation manner, before the first base station sends the uplink data to the second base station, the method further includes:

here, the second base station, that is, the anchor base station, may respectively allocate a forwarding tunnel to all the data radio bearers for uplink small data transmission corresponding to the first terminal according to the context information of the first terminal, and may also respectively allocate a forwarding tunnel to a preset data radio bearer for uplink small data transmission corresponding to one or more first terminals, which is not limited herein.

Correspondingly, in step 103 of the method, the sending, by the first base station, the uplink data to the second base station includes:

The step may specifically include: the first base station performs MAC processing and RLC processing on uplink data sent by the first terminal to obtain processed uplink data; and sending the processed uplink data to the second base station through the first forwarding tunnel. And then, the second base station performs PDCP processing and SDAP processing on the processed uplink data and sends the processed uplink data to the core network side.

When the first request message further includes indication information for indicating that there is the desired downlink small data to be transmitted, as an optional implementation manner, in order to complete transmission of the subsequent downlink small data, the method of the embodiment of the present invention further includes:

That is, in the case that there is the desired small downlink data to be transmitted, the first base station may respectively allocate a forwarding tunnel to all or a part of the data radio bearers used for the small downlink data transmission of the first terminal.

Based on this, further, the method of the embodiment of the present invention may further include:

and sending the downlink data to the first terminal.

It should be noted that, optionally, the downlink data sent by the second base station through the second forwarding tunnel is the downlink data processed by the SDAP and the PDCP at the second base station side; and then, the first base station sends the downlink data after the SDAP processing and the PDCP processing to the first terminal after the RLC processing, the MAC processing and the physical layer processing.

As an optional implementation manner, the method according to the embodiment of the present invention may further include:

after the small data transmission is finished, receiving a second message sent by a second base station, wherein the second message carries a radio resource control release message, and the radio resource control release message is generated by the second base station;

Optionally, the second message is a terminal context release command message.

The information transmission method of the embodiment of the invention comprises the steps that a first request message is sent to a second base station through a first base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is a base station anchor point which is determined by the first base station based on the connection recovery request message; the first base station receives a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point holding; the first base station sends the uplink data to the second base station, so that when the terminal in the inactive state transmits small data, the anchor base station indicates the anchor to keep through the indication information, namely the anchor does not transfer, the terminal can realize small data transmission without recovering the connection state, and the terminal can realize small data transmission in the inactive state, thereby simplifying the data transmission process, improving the transmission efficiency, and particularly avoiding resource waste caused by signaling overhead under the condition that the terminal moves to other base stations or other centralized units CU.

Fig. 2 is a schematic flow chart of an information transmission method according to an embodiment of the present invention. The method is applied to a second base station and comprises the following steps:

step 201: a second base station receives a first request message sent by a first base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data to be transmitted exists, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

step 202: the second base station sends a first response message to the first base station, wherein the first response message comprises the context information of the first terminal and second indication information used for indicating anchor point maintenance;

step 203: and the second base station receives the uplink data sent by the first base station.

The method of the embodiment of the invention corresponds to the method of the embodiment, and the corresponding implemented scene is data transmission between terminals in an inactive state and across base stations. The first base station is a service base station, and the second base station is an anchor base station.

The information transmission method of the embodiment of the invention comprises the steps that a first request message sent by a first base station is received through a second base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message; the second base station sends a first response message to the first base station, the first response message comprises context information of the first terminal and second indication information used for indicating anchor point holding, and the second base station receives the uplink data sent by the first base station, so that when the terminal in the inactive state transmits small data, the second base station, namely the anchor point base station, indicates the anchor point holding through the indication information, namely the anchor point does not transfer, the terminal can realize small data transmission in the inactive state without recovering the connection state, the data transmission process is simplified, the transmission efficiency is improved, and particularly under the condition that the terminal moves to other base stations or other Centralized Units (CUs), resource waste caused by signaling overhead is avoided.

In order to complete transmission of uplink data sent by the first terminal, as an optional implementation manner, after the second base station sends the first response message to the first base station, the method further includes:

correspondingly, in step 203 of the method, the receiving, by the second base station, the uplink data sent by the first base station includes:

The step may specifically include: and receiving uplink data sent by the first base station after the uplink data sent by the first terminal is subjected to MAC processing and RLC processing through the first forwarding tunnel.

And then, the second base station performs PDCP processing and SDAP processing on the uplink data processed by the MAC processing and the RLC processing and sends the uplink data to the core network side.

When the first request message further includes indication information used for indicating that the desired downlink small data is to be transmitted, as an optional implementation manner, in order to complete transmission of subsequent downlink small data, the method in the embodiment of the present invention further includes:

It should be noted that, optionally, the downlink data sent by the second base station through the second forwarding tunnel is the downlink data after being processed by the SDAP and the PDCP at the second base station side. And then, the first base station sends the downlink data after the SDAP processing and the PDCP processing to the first terminal after the RLC processing, the MAC processing and the physical layer processing.

Optionally, the second message is a terminal context release command message.

The following three embodiments specifically describe the implementation process of the information transmission method.

The first embodiment is as follows: referring to fig. 3, the UE in inactive state initiates UL/DL small data transmission on the anchor CU

a 1: UE sends RRC Connection Resume Request message and uplink data to gNB-DU;

here, the UE has UL small data to send in an inactive state, initiates random access to its serving cell, and sends a radio resource control Connection Resume Request RRC Connection Request message and uplink data.

In this embodiment, the RRC Connection response Request message may include a cause value, or may not include a cause value.

a 2: the gNB-DU sends an INITIAL UL RRC MESSAGE TRANSFER message including small data indication to the gNB-CU;

specifically, the gNB-DU buffers UL small data, includes the RRC Connection Request message in an INITIAL uplink radio resource control message transport INITIAL UL RRC MESSAGE TRANSFER message, and transfers the message to the gNB-CU, where the message includes a small data indication for indicating that SDT (small data transport) data needs to be sent.

If the RRC Connection Resume Request message includes a new cause value, the cause value is used to indicate that the Connection Resume Request is for SDT transmission.

The gNB-CU may know that there is currently SDT data to transmit according to the cause value in the RRC Resume Request message and the small data indication delivered in the INITIAL UL RRC MESSAGE TRANSFER message.

a 3: the gNB-CU sends a UE context establishment request message to the gNB-DU;

here, the gNB-CU holds the context of the UE, so the gNB-CU initiates the UE context establishment procedure on the F1 interface.

a 4: the gNB-DU sends a UE context establishment response message to the gNB-CU;

here, after the relevant UE context establishment is completed by the gbb-DU, a UE context establishment response message is sent to the gbb-CU.

a 5: the gNB-DU sends the processed uplink data PDCP PDU to the gNB-CU;

here, the gNB-DU processes the buffered SDT data according to the relevant configuration to obtain a PDCP PDU, and the PDCP PDU is sent to the gNB-CU.

Here, the gNB-CU receives the PDCP PDU, processes the PDCP and SDAP, and sends the processed PDCP and SDAP to the core network.

a 6: UE sends subsequent UL data to gNB-DU;

the step is an optional step, that is, when the UE has subsequent uplink data, the subsequent UL data is sent to the gNB-DU, and the gNB-DU processes the data according to the configuration and sends the processed data to the gNB-CU and further to the core network.

a 7: the gNB-CU sends DL data to the gNB-DU;

the step is an optional step, and when the gNB-CU receives the DL data of the UE, the DL data is processed and then sent to the gNB-DU, and the gNB-DU completes the processing and sending according to the configuration.

a 8: the gNB-CU sends a UE Context Release Command message including an RRC Release message to the gNB-DU;

here, the gNB-CU generates a radio resource control Release RRC Release message to restore the UE to an inactive state, and the message is sent to the gNB-DU by a terminal Context Release Command UE Context Release Command.

Example two: referring to FIG. 4, the UE in the inactive state initiates UL/DL SDT transmission on the non-anchor CU, anchor does not transfer

The embodiment corresponds to a cross-CU small data transmission scene under a CU-DU separation architecture.

b 1: UE sends RRC Connection response Request message and uplink data to service DU;

b 2: the service DU sends an INITIAL UL RRC MESSAGE TRANSFER message including small data indication to the service CU;

specifically, the service DU buffers UL small data, includes the RRC Connection response Request message in an INITIAL uplink radio resource control message transmission INITIAL UL RRC MESSAGE TRANSFER message, and transfers the message to the service CU, where the message includes a small data indication for indicating that SDT (small data transmission) data needs to be sent.

The serving CU may know that there is currently SDT data to transmit based on the cause value in the RRC Resume Request message passed in the initialize UL RRC MESSAGE TRANSFER message and the small data indication.

b 3: the service CU sends a Retrieve UE Context Request message comprising small data indication or cause value to the anchor CU;

here, the serving CU finds an anchor CU according to a UE ID identifier (e.g., I-RNTI) in the RRC Connection Request message, and initiates a Retrieve UE Context procedure, that is, sends a Request Retrieve UE Context Request message including an acquire terminal Context to the anchor CU.

Here, the serving CU indicates in the Retrieve UE Context Request message that the Context Request procedure by the anchor CU is for SDT transmission; specifically, the IE may indicate via an Xn interface, such as: SDT indication; or indicated by a cause value.

b 4: the anchor CU sends a Retrieve UE Context Response message comprising the keep anchor indication to the service CU;

here, the anchor CU may determine to keep the anchor unchanged according to the above-mentioned small data indication or cause value, and transfer the UE Context to the serving CU in a UE Context acquisition Response Retrieve UE Context Response message, where the message includes indication information indicating to keep the anchor unchanged.

b 5: the anchor CU sends an Xn message to the service CU, wherein the Xn message comprises forwarding tunnels of uplink data distributed by the anchor CU for all SDT DRBs of the UE;

b 6: the service CU sends a notification message to the anchor CU, wherein the notification message comprises forwarding tunnels of downlink data distributed by the service CU for all SDT DRBs of the UE;

this step is an optional step. If the service CU may allocate forwarding tunnels for downstream data to DRBs of the SDT, or even all DRBs, and notify the anchor CU.

b 7: the service CU sends a UE Context Setup Request message to the service DU;

here, after receiving the UE Context acquisition response message, the service CU initiates a UE Context establishment procedure to the service DU according to the UE Context therein, that is, sends a terminal Context establishment Request UE Context Request message to the service DU.

b 8: the service DU sends a UE Context Setup Response message to the service CU;

here, after the service DU completes the UE context setup on the relevant F1 interface, a UE context setup response message is sent to the serving CU.

b 9: the service DU sends the processed uplink data PDCP PDU to the service CU;

here, the service DU processes the buffered SDT data according to the relevant configuration to obtain PDCP PDUs, and sends the PDCP PDUs to the service CU.

b 10: the service CU sends the received PDCP PDU to the anchor CU on the forwarding tunnel of the corresponding DRB;

and then, the anchor point CU carries out corresponding PDCP and SDAP processing on the received UL PDCP PDU and then sends the processed UL PDCP PDU to the core network.

b 11: UE sends subsequent UL data to service DU;

the step is an optional step, that is, under the condition that the UE has subsequent uplink data, the service DU performs MAC and RLC processing, and sends the PDCP PDU to the service DU, the service CU sends the service PDU to the anchor CU through the forwarding tunnel of the corresponding DRB, and the anchor CU performs PDCP and SDAP processing and then sends the processed PDCP PDU to the core network CN.

b 12: the anchor CU sends DL data (PDCP PDU) to the service CU;

this step is an optional step. That is, if the anchor CU receives downlink data on a certain SDT DRB, and completes the processing of the SDAP and the PDCP, the anchor CU sends the PDCP PDU to the service CU through the forwarding tunnel of the corresponding DRB, and the service CU forwards the service PDU to the service DU, and the service DU performs RLC, MAC, and corresponding processing of the physical layer, and then sends the service DU to the UE.

b 13: the anchor CU sends a UE Context Release Command comprising an RRC Release message to the service CU;

here, after the SDT data transmission is completed, the anchor CU instructs the serving CU to Release the Context of the UE and adds an RRC Release message in the terminal Context Release Command UE Context Release Command message.

Note that the RRC Release message is generated by the anchor CU and included in the XnAP message.

b 14: the service CU sends a UE Context Release Command comprising an RRC Release message to the service DU;

b 15: the serving DU sends an RRC Release message to the UE.

Here, the service DU sends an RRC Release message to the UE and releases the corresponding UE context.

Example three: UE initiates UL/DL SDT on a non-anchor CU, and the anchor transfer is carried out;

the first three steps in this embodiment are the same as the two embodiments, and the main difference of the subsequent steps is that the anchor CU provides the serving CU with a complete UE Context in the Context request response message, but does not indicate that it is to perform anchor maintenance.

The data forwarding tunnel between the anchor CU and the serving CU also does not need to be established. The service CU completes the establishment of the UE Context of F1 accordingly, and performs RRC connection recovery of an air interface, so that the UE enters a connected state. And the service CU initiates a path transfer process to the core network to complete the switching of the anchor points. The subsequent new serving base station (i.e. the new anchor base station) decides the subsequent state of the UE, such as: remain in a connected state, enter an idle state, or enter an inactive state.

As shown in fig. 5, an embodiment of the present invention further provides a base station, where the base station is a first base station, and the base station includes: memory 520, transceiver 500, processor 510: a memory 520 for storing a computer program; a transceiver 500 for transceiving data under the control of the processor 510; a processor 510 for reading the computer program in the memory 520 and performing the following operations:

sending a first request message to a second base station through a transceiver 500, where the first request message is used to request to acquire context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

and sending the uplink data to the second base station.

Wherein in fig. 5, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 510, and various circuits, represented by memory 520, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 500 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 510 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 510 in performing operations.

The processor 510 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

Optionally, when the first base station comprises a distribution unit and a concentration unit;

Optionally, the transceiver 500 is further configured to:

receiving a first notification message sent by the second base station, where the first notification message includes forwarding tunnels respectively allocated to at least one data radio bearer for uplink small data transmission corresponding to the first terminal by the second base station based on the context information of the first terminal;

Optionally, the transceiver 500 is further configured to:

and sending the downlink data to the first terminal.

Optionally, the transceiver 500 is further configured to:

Optionally, the second message is a terminal context release command message.

The base station of the embodiment of the invention sends a first request message to a second base station through a first base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is an anchor point base station determined by the first base station based on the connection recovery request message; the first base station receives a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance; the first base station sends the uplink data to the second base station, so that when the terminal in the inactive state transmits small data, the anchor base station indicates the anchor to be kept through the indication information, namely the anchor is not transferred, the terminal can be enabled not to restore the connection state, the terminal can realize the transmission of the small data in the inactive state, thereby simplifying the data transmission process, improving the transmission efficiency, and avoiding the resource waste caused by signaling overhead especially under the condition that the terminal moves to other base stations or other centralized units CU.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

As shown in fig. 6, the present invention further provides an information transmission apparatus, which is applied to a first base station, and includes:

a first sending unit 601, configured to send a first request message to a second base station, where the first request message is used to request to obtain context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is an anchor base station that is determined by the first base station based on the connection recovery request message;

a first receiving unit 602, configured to receive a first response message sent by the second base station, where the first response message includes context information of the first terminal and second indication information for indicating anchor point maintenance;

a second sending unit 603, configured to send the uplink data to the second base station.

before a first base station sends a first request message to a second base station, the distribution unit receives the connection recovery request message and the uplink data sent by the first terminal;

Optionally, the apparatus further comprises:

a second receiving unit, configured to receive a first notification message sent by the second base station, where the first notification message includes forwarding tunnels respectively allocated by the second base station to at least one data radio bearer for uplink small data transmission corresponding to the first terminal based on context information of the first terminal;

the second sending unit 603 is specifically configured to:

Optionally, the apparatus further comprises:

a third sending unit, configured to send a second notification message to the second base station, where the second notification message includes forwarding tunnels respectively allocated by the first base station to at least one data radio bearer of the first terminal for downlink small data transmission.

Optionally, the apparatus further comprises:

a third receiving unit, configured to receive downlink data sent by the second base station through a second forwarding tunnel, where the second forwarding tunnel is a forwarding tunnel corresponding to a data radio bearer for transmitting the downlink data;

a fourth sending unit, configured to send the downlink data to the first terminal.

Optionally, the apparatus further comprises:

a fourth receiving unit, configured to receive a second message sent by a second base station after small data transmission is completed, where the second message carries a radio resource control release message, and the radio resource control release message is generated by the second base station;

a fifth sending unit, configured to send the rrc release message to the first terminal, and release the context information of the first terminal.

Optionally, the second message is a terminal context release command message.

The information transmission device of the embodiment of the invention sends a first request message to a second base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is an anchor base station which is determined by the first base station based on the connection recovery request message; receiving a first response message sent by the second base station, wherein the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance; and sending the uplink data to the second base station, so that when the terminal in the inactive state transmits small data, the anchor base station indicates the anchor to be kept through the indication information, namely the anchor is not transferred, the terminal can realize the transmission of the small data without recovering the connection state, and the terminal can realize the transmission of the small data in the inactive state, thereby simplifying the data transmission process, improving the transmission efficiency, and avoiding the resource waste caused by signaling overhead especially under the condition that the terminal moves to other base stations or other Centralized Units (CUs).

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

In some embodiments of the invention, there is also provided a processor-readable storage medium storing program instructions for causing a processor to perform steps of:

sending a first request message to a second base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

and sending the uplink data to the second base station.

When executed by the processor, the program can implement all the implementation manners applied to the method embodiment on the base station side shown in fig. 1, and details are not described here for avoiding repetition.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

As shown in fig. 7, an embodiment of the present invention further provides a base station, where the base station is a second base station, and the base station includes: memory 720, transceiver 700, processor 710: a memory 720 for storing a computer program; a transceiver 700 for transceiving data under the control of the processor 710; a processor 710 for reading the computer program in the memory 720 and performing the following operations:

receiving, by the transceiver 700, a first request message sent by a first base station, where the first request message is used to request to acquire context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

sending a first response message to the first base station, wherein the first response message comprises context information of the first terminal and second indication information for indicating anchor point holding;

and receiving the uplink data sent by the first base station.

Wherein in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 710, and various circuits, represented by memory 720, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 700 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 710 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 710 in performing operations.

The processor 710 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

Optionally, the processor 710 is further configured to:

optionally, the transceiver 700 is further configured to:

Optionally, the transceiver 700 is further configured to:

Optionally, the processor 710 is further configured to:

optionally, the transceiver 700 is further configured to:

Optionally, the second message is a terminal context release command message.

The base station of the embodiment of the invention receives a first request message sent by a first base station through a second base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is a base station anchor point determined by the first base station based on the connection recovery request message; the second base station sends a first response message to the first base station, the first response message comprises context information of the first terminal and second indication information used for indicating anchor point holding, and the second base station receives the uplink data sent by the first base station, so that when the terminal in the inactive state transmits small data, the second base station, namely the anchor point base station, indicates the anchor point holding through the indication information, namely the anchor point does not transfer, the terminal can realize small data transmission in the inactive state without recovering the connection state, the data transmission process is simplified, the transmission efficiency is improved, and particularly under the condition that the terminal moves to other base stations or other Centralized Units (CUs), resource waste caused by signaling overhead is avoided.

As shown in fig. 8, the present invention further provides an information transmission apparatus, which is applied to a second base station, and includes:

a fifth receiving unit 801, configured to receive a first request message sent by a first base station, where the first request message is used to request to acquire context information of a first terminal, the first terminal is a terminal that sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used to indicate that there is uplink small data to be transmitted, and the second base station is an anchor base station that is determined by the first base station based on the connection recovery request message;

a sixth sending unit 802, configured to send a first response message to the first base station, where the first response message includes context information of the first terminal and second indication information for indicating anchor point holding;

a sixth receiving unit 803, configured to receive the uplink data sent by the first base station.

Optionally, the apparatus further comprises:

a first tunnel allocation unit, configured to allocate forwarding tunnels to at least one data radio bearer for uplink small data transmission corresponding to the first terminal based on the context information of the first terminal;

a seventh sending unit, configured to send a first notification message to the first base station, where the first notification message includes a forwarding tunnel allocated to the first terminal;

the sixth receiving unit 803 is further configured to:

Optionally, the apparatus further comprises:

a seventh receiving unit, configured to receive a second notification message sent by the first base station, where the second notification message includes forwarding tunnels respectively allocated by the first base station to at least one data radio bearer of the first terminal, where the data radio bearer is used for downlink small data transmission.

Optionally, the apparatus further comprises:

an eighth sending unit, configured to send, when receiving downlink data, the downlink data to the first base station through a second forwarding tunnel, where the second forwarding tunnel is a forwarding tunnel corresponding to a data radio bearer for transmitting the downlink data.

Optionally, the apparatus further comprises:

a generating unit configured to generate a radio resource control release message after completion of the small data transmission;

a ninth sending unit, configured to send a second message to the first base station, where the second message carries a radio resource control release message.

Optionally, the second message is a terminal context release command message.

The information transmission device of the embodiment of the invention receives a first request message sent by a first base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message comprises first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and a second base station is an anchor point base station determined by the first base station based on the connection recovery request message; the method comprises the steps of sending a first response message to a first base station, wherein the first response message comprises context information of a first terminal and second indication information used for indicating anchor point holding, and receiving uplink data sent by the first base station, so that when the terminal in an inactive state transmits small data, a second base station, namely an anchor point base station indicates the anchor point holding through the indication information, namely the anchor point does not transfer, the terminal can realize small data transmission in the inactive state without recovering a connection state, the data transmission process is simplified, the transmission efficiency is improved, and particularly under the condition that the terminal moves to other base stations or other Centralized Units (CUs), resource waste caused by signaling overhead is avoided.

receiving a first request message sent by a first base station, wherein the first request message is used for requesting to acquire context information of a first terminal, the first terminal is a terminal which sends a connection recovery request message and uplink data to the first base station and is in an inactive state, the first request message includes first indication information, the first indication information is used for indicating that uplink small data exist to be transmitted, and the second base station is an anchor base station determined by the first base station based on the connection recovery request message;

and receiving the uplink data sent by the first base station.

When executed by the processor, the program can implement all the implementation manners applied to the method embodiment on the base station side shown in fig. 2, and details are not described here for avoiding repetition.

The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, the applicable System may be a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (General Packet Radio Service, GPRS) System, a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (Frequency Division Duplex, FDD) System, a LTE Time Division Duplex (TDD) System, a Long Term Evolution (Long Term Evolution Access, LTE-a) System, a Universal Mobile Telecommunications System (UMTS), a Universal Mobile telecommunications Access (WiMAX) System, a New Radio network Access (NR 5, WiMAX) System, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5GS), and the like.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be called a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

The base station according to the embodiment of the present application may include a plurality of cells for providing a service to the terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames and Internet Protocol (IP) packets with one another as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communications network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), may be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may be a evolved Node B (eNB or e-NodeB) in a Long Term Evolution (Long Term Evolution, LTE) System, may be a 5G Base Station (gbb) in a 5G network architecture (next generation System), may be a Home evolved Node B (Home B, HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico Base Station), and the like, and is not limited in the embodiments of the present application. In some network architectures, network devices may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

Multiple Input Multiple Output (MIMO) transmission may be performed between the base station and the terminal device by using one or more antennas, and the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). According to the form and the number of the root antenna combination, the MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, and can also be diversity transmission, precoding transmission, beamforming transmission, etc.

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

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

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. An information transmission method, comprising:

and the first base station sends the uplink data to the second base station.

2. The method of claim 1, wherein the first request message further comprises: assistance information comprising at least one of:

3. The method of claim 1, wherein the first indication information is obtained based on a cause value in the connection recovery request message, or wherein the first indication information is obtained by the first base station based on the uplink data.

4. The method of claim 1, wherein when the first base station comprises a distribution unit and a concentration unit;

5. The method of claim 4, wherein the first signaling message is an initial uplink radio resource control message transmission message.

6. The method of claim 1, wherein before the first base station transmits the uplink data to the second base station, the method further comprises:

7. The method of claim 1, further comprising:

8. The method of claim 7, further comprising:

and sending the downlink data to the first terminal.

9. The method of claim 1, further comprising:

10. The method of claim 9, wherein the second message is a terminal context release order message.

11. An information transmission method, comprising:

12. The method of claim 11, wherein the first request message further comprises: assistance information comprising at least one of:

13. The method of claim 11, wherein the first indication information is obtained based on a cause value in the connection recovery request message, or wherein the first indication information is obtained by the first base station based on the uplink data.

14. The method of claim 11, wherein after the second base station sends the first response message to the first base station, the method further comprises:

15. The method of claim 11, further comprising:

16. The method of claim 15, further comprising:

17. The method of claim 11, further comprising:

18. The method of claim 17, wherein the second message is a terminal context release order message.

19. A base station, the base station being a first base station, comprising: memory, transceiver, processor: a memory for storing program instructions; a transceiver for transceiving data under control of the processor; a processor to read program instructions in the memory and perform the following:

and sending the uplink data to the second base station.

20. An information transmission apparatus applied to a first base station, comprising:

21. A base station, the base station being a second base station, comprising: memory, transceiver, processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following:

and receiving the uplink data sent by the first base station.

22. An information transmission apparatus applied to a second base station, comprising:

23. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to execute the steps of the information transmission method of any one of claims 1 to 10 or the steps of the information transmission method of any one of claims 11 to 18.