CN114828158B

CN114828158B - Information transmission method, device, base station and medium

Info

Publication number: CN114828158B
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: 2024-04-05
Anticipated expiration: 2041-01-22
Also published as: CN114828158A; WO2022156439A1

Abstract

The invention provides an information transmission method, an information transmission device, a base station and a medium, which solve the problem that in the prior art, when a terminal in an inactive state transmits small data, a base station side processes the transmission of the uplink small data so that the terminal does not need to enter a connection 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, wherein 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 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 maintenance is received; and sending the uplink data to the second base station. When the terminal in the inactive state transmits small data, the anchor point base station indicates the anchor point to keep through the indication information, so that the terminal does not need to recover the connection state, the data transmission process is simplified, the transmission efficiency is improved, and the resource waste caused by 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 device, 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 is initiated to return to an RRC connected state, and then uplink and downlink data transmission is performed. And for terminals that need only transmit small amounts of data, even one uplink packet, the connection recovery procedure is initiated back to RRC connected state.

When a terminal in an rrc_inactive state is transmitting small data, how to process transmission of the uplink small data by the base station side, so that the terminal does not need to enter a connection state, thereby simplifying a data transmission process, improving transmission efficiency, and particularly avoiding resource waste caused by signaling overhead when the terminal moves to other base stations or other central units CU, which is a problem to be solved urgently.

Disclosure of Invention

The invention aims to provide an information transmission method, an information transmission device, a base station and a medium, which are used for solving the problem that in the prior art, when a terminal in an RRC_inactive state transmits small data, a base station side processes the transmission of the uplink small data so that the terminal does not need to enter a connection 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 includes: auxiliary information including at least one of the following information:

the third indication information is used for indicating whether the follow-up uplink small data are to be transmitted or not;

and fourth indication information, which is used for indicating whether the expected downlink small data are to be transmitted.

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 comprises:

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 size of the uplink data to be transmitted, and the fifth indication information is used for indicating that the uplink data to be transmitted exist.

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

Wherein before the first base station sends the uplink data to the second base station, the method further comprises:

receiving a first notification message sent by the second base station, wherein the first notification message comprises a forward tunnel 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;

the first base station sending the uplink data to the second base station, including:

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, wherein the second notification message comprises a forwarding tunnel 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 the 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.

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 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, wherein the first response message comprises 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:

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

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

the second base station receiving the uplink data sent by the first base station includes:

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, wherein the second notification message comprises forwarding tunnels respectively allocated by the first base station for at least one data radio bearer for downlink small data transmission of the first terminal.

Wherein the method further comprises:

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

Wherein the method further comprises:

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

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

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, including: 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:

a first request message is sent 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 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;

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 obtain context information of a first terminal, where 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, where 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;

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 that indicates that an anchor point holds the first terminal;

And the second sending unit is used for sending 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, including: 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 obtain context information of a first terminal, where 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, where 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;

transmitting 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, applied to a second base station, including:

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 obtain context information of a first terminal, where 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, where 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;

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 that indicates that an anchor point is maintained;

and 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 storing a computer program for causing the processor to execute the steps of the above-described information transmission method.

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

in the above 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, where the first indication information is used to indicate that there is small uplink 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; 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 point base station indicates the anchor point to keep through the indication information, namely, the anchor point is not transferred, so that the terminal does not need to restore a connection state, the terminal can realize small data transmission in the inactive state, the data transmission process is simplified, the transmission efficiency is improved, and particularly, resource waste caused by signaling overhead is avoided under the condition that the terminal moves to other base stations or other centralized units CU.

Drawings

Fig. 1 is a schematic flow chart of an information transmission method according to an embodiment of the invention;

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

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

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

fig. 5 is one of the block diagrams of the base station according to the embodiment of the present invention;

fig. 6 is a schematic block diagram of an information transmission device according to an embodiment of the present invention;

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

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

Detailed Description

In the embodiment of the invention, the term "and/or" describes the association relation of the association objects, which means that three relations can exist, for example, a and/or B can be expressed as follows: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

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 in the prior art, when a terminal in an RRC_inactive state transmits small data, a base station side processes the transmission of the uplink small data so that the terminal does not need to enter a connection state. The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.

As shown in fig. 1, a flow chart of an information transmission method according to an embodiment of the present invention is shown, where 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 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;

In this step, the first base station and the second base station may both include CU and DU in a separated architecture based on CU (Centralized Unit) -DU (Distributed Unit), or may be base stations in a non-separated 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 a terminal in an inactive state. Namely, the method implements the corresponding scenario of data transmission between base stations and in the inactive state of the terminal.

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 restoration request message sent by the first terminal, the first base station finds the anchor base station according to the UE (User Equipment) ID identifier, such as I-RNTI (Inactive radio Network Temporary Identifier, inactive network temporary identifier), in the connection restoration request message.

Here, the first indication information is used for indicating that there is small uplink data to be transmitted, which indicates that the first base station knows that the uplink data sent by the first terminal is small uplink data. It should be noted that small data may be understood as data having a smaller amount of data to be transmitted than a predetermined data amount, for example, a smaller size of data packets and/or a smaller number of data packets.

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 retention may be understood as anchor unchanged 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, or may be determined independently of the first indication information and other auxiliary information, which is not particularly limited herein.

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 that the anchor point is maintained in the previous step, no additional signaling interaction is required between the base station and the first terminal for recovering the connection state of the first terminal, so as to avoid resource waste caused by signaling overhead, and uplink data is directly sent from the first base station to the second base station, and then the second base station transmits the uplink data to the core network side.

According to the information transmission method, 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 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; 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 point base station indicates the anchor point to keep through the indication information, namely, the anchor point is not transferred, so that the terminal does not need to restore a connection state, the terminal can realize small data transmission in the inactive state, the data transmission process is simplified, the transmission efficiency is improved, and particularly, resource waste caused by signaling overhead is avoided under the condition that the terminal moves to other base stations or other centralized units CU.

Optionally, the first request message further includes: auxiliary information including at least one of the following information:

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

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

The second instruction information may be determined by the first instruction information or may be determined by the first instruction information and the auxiliary information together, and of course, the second instruction information may be determined independently of the first instruction information and the auxiliary information.

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

The reason parameter is added to the connection recovery request message to indicate the reason of the current connection recovery request. The values of the reason parameters, that is, the reasons indicating the current connection recovery request corresponding to different reason values are also different.

For the case that the first indication information is obtained based on the cause value in the connection restoration request message, the cause value in the connection restoration request message is used to indicate that the cause of the current connection restoration 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:

under the condition that 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 judge that the uplink data sent by the first terminal is uplink small data, so that first indication information is obtained.

When 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 judge that the uplink data sent by the first terminal is small uplink data and inform the CU, so that the CU obtains first indication information; if the connection recovery request message includes a cause value for indicating that the cause of the current connection recovery request is that the first terminal needs to transmit 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 uplink small data to the CU, so that the CU obtains the first indication information.

Optionally, the first indication information is indicated by an interface indication or a cause value.

As an alternative implementation, when the first base station comprises 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 CUs and DUs under a CU-DU based separation architecture.

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

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

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

Note that, the DU in the first base station may send the received connection restoration request message to the CU in the first base station.

After receiving the connection recovery request message sent by the first terminal, the CU in the first base station finds the CU in the second base station, namely the anchor point CU, according to the UE ID identification, such as I-RNTI, in the connection recovery request message.

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

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

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

In order to complete the transmission of the 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 allocate forwarding tunnels for all data radio bearers for uplink small data transmission corresponding to the first terminal according to the context information of the first terminal, or allocate forwarding tunnels for one or more preset data radio bearers for uplink small data transmission corresponding to the first terminal, which is not specifically limited herein.

Correspondingly, in step 103 of the method, the first base station sends the uplink data to the second base station, including:

The method specifically comprises the following steps: 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 desired downlink small data to be transmitted, in order to complete the transmission of the subsequent downlink small data, as an optional implementation manner, the method of the embodiment of the present invention further includes:

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

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.

Optionally, the downlink data sent by the second base station through the second forwarding tunnel is downlink data after SDAP processing and PDCP processing at the second base station side; and then, the first base station performs RLC processing, MAC processing and physical layer processing on the downlink data subjected to SDAP processing and PDCP processing and sends the downlink data to the first terminal.

As an alternative implementation manner, the method of the embodiment of the present invention may further include:

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

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 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;

step 202: the second base station sends 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 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 implementation scene is data transmission between the base stations and the terminal in the inactive state. 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 the 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, wherein the first response message comprises the context information of the first terminal and second indication information for indicating the anchor point to keep, and the second base station receives the uplink data sent by the first base station, so that when the terminal in an inactive state transmits small data, the second base station, namely the anchor point base station, indicates the anchor point to keep through the indication information, namely the anchor point is not transferred, the terminal does not need to recover a connection state, the terminal can realize small data number transmission in the inactive state, the data transmission process is simplified, the transmission efficiency is improved, and especially, resource waste caused by signaling overhead is avoided under the condition that the terminal moves to other base stations or other centralized units CU.

In order to complete the transmission of the 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 second base station receives the uplink data sent by the first base station, and includes:

The method specifically comprises the following steps: and receiving uplink data sent by the first base station after MAC processing and RLC processing are carried out on the uplink data sent by the first terminal through the first forwarding tunnel.

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

Optionally, the downlink data sent by the second base station through the second forwarding tunnel is downlink data after SDAP processing and PDCP processing at the second base station side. And then, the first base station performs RLC processing, MAC processing and physical layer processing on the downlink data subjected to SDAP processing and PDCP processing and sends the downlink data to the first terminal.

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

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

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

Embodiment one: referring to fig. 3, a UE in an inactive state initiates UL/DL small data transmission at an anchor CU

a1: the UE sends RRC Connection Resume Request information and uplink data to the gNB-DU;

here, the UE needs to transmit UL small data in the active state, and the UE initiates random access to its serving cell, and transmits a radio resource control connection recovery request RRC Connection Resume Request message and uplink data.

In this embodiment, the RRC Connection Resume Request message may include the newly added cause value, or may have no newly added cause value.

a2: 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, and transmits a RRC Connection Resume Request message to the gNB-CU, where the message includes a small data indication to indicate that SDT (small data transmission) data needs to be sent, including an INITIAL uplink radio resource control message transmission initialization UL RRC MESSAGE TRANSFER message.

If the RRC Connection Resume Request message includes a newly added cause value, the cause value is used to indicate that the connection recovery request is for SDT delivery.

The gNB-CU may know that SDT data currently needs to be transmitted based on the cause value in RRC Resume Request message and the small data indication communicated in INITIAL UL RRC MESSAGE TRANSFER message.

a3: the gNB-CU sends a UE context establishment request message to the gNB-DU;

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

a4: the gNB-DU sends a UE context establishment response message to the gNB-CU;

here, after the gNB-DU completes the establishment of the relevant UE context, a UE context establishment response message is sent to the gNB-CU.

a5: 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 PDCP PDUs, and sends the PDCP PDUs to the gNB-CU.

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

a6: the UE sends subsequent UL data to the gNB-DU;

this step is an optional step, i.e. in case the UE has subsequent uplink data, subsequent UL data is sent to the gNB-DU, which is processed according to the aforementioned configuration and sent to the gNB-CU and further to the core network.

a7: 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 is processed and sent according to the configuration.

a8: the gNB-CU sends UE Context Release Command message including RRC Release message to gNB-DU;

here, the gNB-CU generates a radio resource control Release RRC Release message to restore the UE to the inactive state, which is issued to the gNB-DU by the terminal context Release command UE Context Release Command.

Embodiment two: referring to fig. 4, a UE in an inactive state initiates UL/DL SDT transmission at a non-anchor CU, the anchor is not transferred

This embodiment corresponds to a CU-DU split architecture where a small data transmission scenario across CUs is performed.

b1: the UE sends RRC Connection Resume Request information and uplink data to the service DU;

b2: 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, and transmits a RRC Connection Resume Request message to the service CU, where the message includes a small data indication indicating that SDT (small data transmission) data needs to be sent, in an INITIAL uplink radio resource control message transmission INITIAL UL RRC MESSAGE TRANSFER message.

The serving CU may know that SDT data is currently in need of transmission based on the cause value in the RRC Resume Request message conveyed in the INITIAL UL RRC MESSAGE TRANSFER message and the small data indication.

b3: the serving CU sends Retrieve UE Context Request messages to the anchor CU including small data indication or cause value;

here, the serving CU finds the anchor CU from the UE ID identity (e.g., I-RNTI) in the RRC Connection Resume Request message and initiates Retrieve UE Context a procedure, i.e., sends a message to the anchor CU including the get terminal context request Retrieve UE Context Request.

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

b4: the anchor CU sends Retrieve UE Context Response messages including keep anchor indication to the serving CU;

here, the anchor CU may decide to keep the anchor unchanged according to small data indication or cause value described above, and transmit 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 that the anchor is kept unchanged.

b5: the anchor CU sends an Xn message to the service CU, wherein the Xn message comprises forward tunnels of uplink data distributed by the anchor CU for all SDT DRBs of the UE;

b6: the service CU sends a notification message to the anchor CU, wherein the notification message comprises forward 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 forward tunnels of downlink data for DRBs of the SDT, even all DRBs, and inform the anchor CU.

b7: the service CU sends UE Context Setup Request a 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 Setup Request message to the service DU.

b8: the service DU sends UE Context Setup Response message to the service CU;

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

b9: 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.

b10: the service CU sends the received PDCP PDU to the anchor CU on a forwarding tunnel of the corresponding DRB;

and then, the anchor point CU processes the received UL PDCP PDU and sends the corresponding PDCP PDU and SDAP PDU to the core network.

b11: the UE sends subsequent UL data to the service DU;

the step is an optional step, that is, in the case that the UE has subsequent uplink data, the service DU performs processing of MAC and RLC, sends PDCP PDUs to the service DU, the service CU sends PDCP PDUs to the anchor CU through the forward tunnel of the corresponding DRB, and the anchor CU performs processing of PDCP and SDAP and sends PDCP PDUs to the core network CN.

b12: 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 SDT DRB, after completing processing of the SDAP and PDCP, the PDCP PDU is sent to the service CU through a forward tunnel of the corresponding DRB, the service CU forwards the PDCP PDU to the service DU, and the service DU is sent to the UE after performing processing corresponding to RLC, MAC and physical layer.

b13: the anchor CU sends UE Context Release Command to the serving CU including an RRC Release message;

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

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

b14: the service CU sends UE Context Release Command including the RRC Release message to the service DU;

b15: the service DU sends an RRC Release message to the UE.

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

Embodiment III: the UE initiates UL/DL SDT at a non-anchor CU, and the anchor is transferred;

the first three steps in this embodiment are identical to the embodiments, the main difference in the subsequent steps is that the anchor CU provides the complete UE Context for the serving CU in the Context request response message, but does not indicate that it is to do anchor maintenance.

Nor does the data forwarding tunnel between the anchor CU and the serving CU need to be established. And the service CU completes the UE Context establishment of F1 according to the request, and performs RRC connection recovery of an air interface so as to enable the UE to enter a connected state. And the service CU initiates a path transfer process to the core network to finish the switching of the anchor points. The subsequent new serving base station (i.e., new anchor base station) determines the subsequent state of the UE, such as: remain in the connected state, enter the idle state, or enter the 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 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:

transmitting, by the transceiver 500, 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, where the first terminal is a terminal that transmits 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, where 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.

Where in FIG. 5, a bus architecture may comprise any number of interconnected buses and bridges, with various circuits of the one or more processors, as represented by processor 510, and the memory, as represented by memory 520, being linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 500 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. 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 (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), and may also employ 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:

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 in 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 the 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 exists 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; 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 point base station indicates the anchor point to keep through the indication information, namely, the anchor point is not transferred, so that the terminal does not need to restore a connection state, the terminal can realize small data transmission in the inactive state, the data transmission process is simplified, the transmission efficiency is improved, and particularly, resource waste caused by signaling overhead is avoided under the condition that the terminal moves to other base stations or other centralized units CU.

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

As shown in fig. 6, the embodiment of 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, where 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, where 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;

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;

And 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 to at least one data radio bearer for uplink small data transmission corresponding to the first terminal by the second base station based on context information of the first terminal;

the second sending unit 603 is specifically configured to:

Optionally, the apparatus further comprises:

and the third sending unit is used for sending a second notification message to the second base station, wherein the second notification message comprises 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.

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 that transmits the downlink data;

And 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, after completing small data transmission, a second message sent by a second base station, 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;

and a fifth sending unit, configured to send the radio resource control release message to the first terminal, and release 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 is characterized in that a first request message is sent to a second base station, wherein the first request message is used for requesting to acquire the 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; 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, wherein when the terminal in the inactive state transmits small data, the anchor point base station indicates the anchor point to keep through the indication information, namely the anchor point is not transferred, so that the terminal does not need to restore the connection state, and the terminal can realize the transmission of the small data number in the inactive state, thereby simplifying the data transmission process, improving the transmission efficiency, and avoiding the resource waste caused by signaling overhead especially when the terminal moves to other base stations or other centralized units CU.

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

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

a first request message is sent 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 exists 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.

The program, when executed by the processor, can implement all the implementation manners in the method embodiment applied to the base station side as shown in fig. 1, and in order to avoid repetition, will not be repeated here.

The processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), and the like.

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 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 obtain context information of a first terminal, where 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, where the first indication information is used to indicate that there is small uplink 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 receiving the uplink data sent by the first base station.

Wherein in fig. 7, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 710 and various circuits of memory represented by memory 720, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 700 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. 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 (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), or it may employ 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 in 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 exists 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, wherein the first response message comprises the context information of the first terminal and second indication information for indicating the anchor point to keep, and the second base station receives the uplink data sent by the first base station, so that when the terminal in an inactive state transmits small data, the second base station, namely the anchor point base station, indicates the anchor point to keep through the indication information, namely the anchor point is not transferred, the terminal does not need to recover a connection state, the terminal can realize small data number transmission in the inactive state, the data transmission process is simplified, the transmission efficiency is improved, and especially, resource waste caused by signaling overhead is avoided under the condition that the terminal moves to other base stations or other centralized units CU.

As shown in fig. 8, the 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 801, configured to receive a first request message sent by a first base station, where the first request message is used to request to obtain context information of a first terminal, where 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, where 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;

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 maintenance;

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

Optionally, the apparatus further comprises:

the first tunnel allocation unit is used for allocating forward 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 for downlink small data transmission of the first terminal.

Optionally, the apparatus further comprises:

and the eighth sending unit is used for 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.

Optionally, the apparatus further comprises:

a generation unit for generating a radio resource control release message after the completion of the small data transmission;

and 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 is characterized in that a first request message sent by a first base station is received, wherein the first request message is used for requesting to acquire the 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 exists to be transmitted, and a second base station is an anchor base station determined by the first base station based on the connection recovery request message; the method comprises the steps that a first response message is sent to a first base station, the first response message comprises context information of the first terminal and second indication information used for indicating anchor point maintenance, uplink data sent by the first base station is received, so that when a terminal in an inactive state transmits small data, the second base station, namely an anchor point base station, indicates the anchor point maintenance through the indication information, namely the anchor point is not transferred, the terminal can achieve small data number transmission without recovering a connection state, the terminal can achieve small data number transmission in the inactive state, the data transmission process is simplified, the transmission efficiency is improved, and especially, resource waste caused by signaling overhead is avoided under the condition that the terminal moves to other base stations or other concentrated units CU.

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 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;

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

The program, when executed by the processor, can implement all the implementation manners in the above-mentioned method embodiment applied to the base station side as shown in fig. 2, and in order to avoid repetition, will not be repeated here.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE), LTE frequency division duplex (Frequency Division Duplex, FDD), LTE time division duplex (Time Division Duplex, TDD), long term evolution-advanced (Long Term Evolution Advanced, LTE-a), universal mobile system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide interoperability for Microwave Access, wiMAX), 5G New air interface (New Radio, NR), and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

The terminal device according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.

The base station according to the embodiment of the application may include a plurality of cells for providing services for the terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be operable to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (Long Term Evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, the network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions, which may be Single-User MIMO (SU-MIMO) or Multiple-User MIMO (MU-MIMO), may each be performed between a base station and a terminal device using one or more antennas. The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

It will be appreciated by those skilled in the art that 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, magnetic 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. An information transmission method, comprising:

the first base station sends the uplink data to the second base station;

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

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

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

4. The method of claim 1, wherein the first signaling message is an initial uplink radio resource control message transmission message.

5. The method of claim 1, wherein prior to the first base station transmitting the uplink data to the second base station, the method further comprises:

6. The method according to claim 1, wherein the method further comprises:

7. The method of claim 6, wherein the method further comprises:

And sending the downlink data to the first terminal.

8. The method according to claim 1, wherein the method further comprises:

9. The method of claim 8, wherein the second message is a terminal context release command message.

10. An information transmission method, comprising:

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 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; when the first base station comprises a distribution unit and a concentration unit, the distribution unit receives the connection recovery request message and the uplink data sent by the first terminal before the first base station sends the first request message to the second base station; 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 size of the uplink data to be transmitted, and the fifth indication information is used for indicating that the uplink data exists to be transmitted;

11. The method of claim 10, wherein the first request message further comprises: auxiliary information including at least one of the following information:

12. The method of claim 10, wherein the first indication information is obtained based on a cause value in the connection restoration request message or the first indication information is obtained by the first base station based on the uplink data.

13. The method of claim 10, wherein after the second base station transmits the first response message to the first base station, the method further comprises:

14. The method according to claim 10, wherein the method further comprises:

15. The method of claim 14, wherein the method further comprises:

16. The method according to claim 10, wherein the method further comprises:

17. The method of claim 16, wherein the second message is a terminal context release command message.

18. 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 for reading the program instructions in the memory and performing the following operations:

transmitting the uplink data to the second base station;

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

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

20. 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 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 obtain context information of a first terminal, where 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, where 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; when the first base station comprises a distribution unit and a concentration unit, the distribution unit receives the connection recovery request message and the uplink data sent by the first terminal before the first base station sends the first request message to the second base station; 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 size of the uplink data to be transmitted, and the fifth indication information is used for indicating that the uplink data exists to be transmitted;

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

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

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 obtain context information of a first terminal, where 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, where 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; when the first base station comprises a distribution unit and a concentration unit, the distribution unit receives the connection recovery request message and the uplink data sent by the first terminal before the first base station sends the first request message to the second base station; 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 size of the uplink data to be transmitted, and the fifth indication information is used for indicating that the uplink data exists to be transmitted;

22. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to execute the steps of the information transmission method according to any one of claims 1 to 9 or the steps of the information transmission method according to any one of claims 10 to 17.