CN110139387A - A kind of transmission method of uplink small data, network side DU and network side CU - Google Patents
A kind of transmission method of uplink small data, network side DU and network side CU Download PDFInfo
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- CN110139387A CN110139387A CN201810129878.3A CN201810129878A CN110139387A CN 110139387 A CN110139387 A CN 110139387A CN 201810129878 A CN201810129878 A CN 201810129878A CN 110139387 A CN110139387 A CN 110139387A
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- target terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/12—Setup of transport tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/22—Manipulation of transport tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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Abstract
The embodiment of the present invention discloses a kind of transmission method of uplink small data, network side DU and network side CU, this method comprises: network side DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；The network side DU sends the access request for being directed to the target terminal user to network side CU；The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, to establish the context of the target terminal user；The network side DU sends the uplink small data to the network side CU；The network side DU sends replying message for the upstream message to the target terminal user.The embodiment of the present invention can support the uplink small data under inactive state to transmit under CU and DU separation architecture.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of transmission method of uplink small data, network side are distributed
Unit (Distributed Unit, DU) and network side centralized unit (Centralized Unit, CU).
Background technique
5th generation (5thGeneration, 5G) communication system for user terminal state, remove connected state (connected
State) and Idle state (idle state) except, newly introduce inactive state (Inactive state).User terminal can be under inactive state
Carry out cell reselection, receive system information broadcast and receive paging message etc., and connected state can be quickly recovered to.In addition,
There is also small data in 5G communication system, small data is the smaller data of data bulk, such as: the communication message of small data quantity
Or picture of small data quantity etc..And the separation architecture of CU and DU are newly introduced in 5G communication system in network side.Exist in this way
Under CU and DU separation architecture, how to support the uplink small data under inactive state to transmit is current technical problem urgently to be solved.
Summary of the invention
The embodiment of the present invention provides a kind of transmission method of uplink small data, network side DU and network side CU, to solve
Under CU and DU separation architecture, the problem of how supporting uplink small data under inactive state to transmit.
The embodiment of the present invention provides a kind of transmission method of uplink small data, comprising:
Network side DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；
The network side DU sends the access request for being directed to the target terminal user to network side CU；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, with
Establish the context of the target terminal user；
The network side DU sends the uplink small data to the network side CU；
The network side DU sends replying message for the upstream message to the target terminal user.
Optionally, the upstream message includes:
The control list of wireless heterogeneous networks (Radio Resource Control, RRC) message or media access control
First (Media Access Control Control Element, MAC CE) message.
Optionally, if the upstream message includes the RRC information, the access request includes the RRC information；Or
Person
If the upstream message includes the MAC CE message, the access request includes the target terminal user
Context identifier, the Context identifier of the target terminal user are that the network side DU is obtained from the MAC CE message
's.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net
Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network
What side DU was generated.
Optionally, in the control plane of the network side CU (Control Plane, CP) and user face (UserPlane, UP)
In the case where separation, the network side DU sends the uplink small data to the network side CU, comprising:
The network side DU sends the uplink small data to the UP of the network side CU.
Optionally, the method also includes:
The network side DU receives the deletion notice that the network side CU is sent, and the deletion notice is for notifying the net
Network side DU deletes the context of the user terminal of inactive state；
The network side DU deletes the context of the user terminal of inactive state.
The embodiment of the present invention also provides a kind of transmission method of uplink small data, comprising:
Network side CU receives the access request for the target terminal user that network side DU is sent for inactive state；
The network side CU obtains the context of the target terminal user；
The network side CU initiates the context establishment process of the target terminal user to the network side DU；
The network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
Optionally, the network side CU obtains the context of the target terminal user, comprising:
The network side CU obtains the context of the pre-stored target terminal user of the network side CU；Or
In the case where the context of the network side CU not stored target terminal user, the network side CU from
The target BS that the target terminal user connected obtains the context of the target terminal user.
Optionally, the network side CU obtains the context of the target terminal user, comprising:
If the access request includes the RRC information of the target terminal user, the network side CU disappears from the RRC
The Context identifier of the target terminal user is obtained in breath, and according to the Context identifier, it is whole to obtain the target user
The context at end；Or
If the access request includes the Context identifier of the target terminal user, the network side CU is according to
Context identifier obtains the context of the target terminal user.
Optionally, in the case where the CP and UP of the network side CU separation, the network side CU receives the network side
The uplink small data for the target terminal user that DU is sent, comprising:
The UP of the network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
Optionally, the method also includes:
The network side CU is sent to the network side DU deletes notice, and the deletion notice is for notifying the network side
DU deletes the context of the user terminal of inactive state.
The embodiment of the present invention also provides a kind of network side DU, comprising:
First receiving module, for receiving the upstream message and uplink decimal that the target terminal user of inactive state is sent
According to；
First sending module, for sending the access request for being directed to the target terminal user to network side CU；
Receiving module, for receiving the context establishment process for the target terminal user that the network side CU is initiated,
To establish the context of the target terminal user；
Second sending module, for sending the uplink small data to the network side CU；
Third sending module, for sending replying message for the upstream message to the target terminal user
The embodiment of the present invention also provides a kind of network side CU, comprising:
First receiving module, the access that the target terminal user for being directed to inactive state is sent for receiving network side DU are asked
It asks；
Module is obtained, for obtaining the context of the target terminal user；
Initiation module, for initiating the context establishment process of the target terminal user to the network side DU；
Second receiving module, for receiving the uplink small data for the target terminal user that the network side DU is sent.
The embodiment of the present invention also provides a kind of network side DU, comprising: transceiver, memory, processor and is stored in described
On memory and the computer program that can run on the processor, which is characterized in that
The transceiver, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
The access request for being directed to the target terminal user is sent to network side CU；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target
The context of user terminal；
The uplink small data is sent to the network side CU；
Replying message for the upstream message is sent to the target terminal user.
Optionally, the upstream message includes:
RRC information or MAC CE message.
Optionally, if the upstream message includes the RRC information, the access request includes the RRC information；Or
Person
If the upstream message includes the MAC CE message, the access request includes the target terminal user
Context identifier, the Context identifier of the target terminal user are that the network side DU is obtained from the MAC CE message
's.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net
Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network
What side DU was generated.
Optionally, described to described in the network side CU transmission in the case where CP and UP of the network side CU separation
Uplink small data, comprising:
The uplink small data is sent to the UP of the network side CU.
Optionally, the transceiver, is also used to receive the deletion notice that the network side CU is sent, and the deletion notice is used
In notifying the network side DU to delete the context of the user terminal of inactive state；
The processor is also used to delete the context of the user terminal of inactive state.
The embodiment of the present invention also provides a kind of network side CU, comprising: transceiver, memory, processor and is stored in described
On memory and the computer program that can run on the processor, which is characterized in that
The transceiver sends the access request of the target terminal user for inactive state for receiving network side DU；
Obtain the context of the target terminal user；
The context establishment process of the target terminal user is initiated to the network side DU；
Receive the uplink small data for the target terminal user that the network side DU is sent.
Optionally, the context for obtaining the target terminal user, comprising:
Obtain the context of the pre-stored target terminal user of the network side CU；Or
It is whole from the target user in the case where context of the not stored target terminal user of the network side CU
The target BS connected is held to obtain the context of the target terminal user.
Optionally, the context for obtaining the target terminal user, comprising:
If the access request includes the RRC information of the target terminal user, from the RRC information described in acquisition
The Context identifier of target terminal user, and according to the Context identifier, obtain the context of the target terminal user；Or
Person
If the access request includes the Context identifier of the target terminal user, according to the Context identifier,
Obtain the context of the target terminal user.
Optionally, described to receive what the network side DU was sent in the case where the CP and UP of the network side CU separation
The uplink small data of the target terminal user, comprising:
The UP of the network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
Optionally, the transceiver, which is also used to send to the network side DU, deletes notice, and the deletion notice is for leading to
Know that the network side DU deletes the context of the user terminal of inactive state.
The embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with computer program, the program
The step in the transmission method of the uplink small data of network side DU provided in an embodiment of the present invention is realized when being executed by processor, or
Person's program is realized when being executed by processor in the transmission method of the uplink small data of network side CU provided in an embodiment of the present invention
The step of.
In this way, network side DU receives the upstream message that the target terminal user of inactive state is sent in the embodiment of the present invention
And uplink small data；The network side DU sends the access request for being directed to the target terminal user to network side CU；The net
Network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, and is used with establishing the target
The context of family terminal；The network side DU sends the uplink small data to the network side CU；The network side DU is to institute
It states target terminal user and sends replying message for the upstream message.It can be supported non-sharp under CU and DU separation architecture in this way
Uplink small data transmission under state living, and the efficiency of transmission of user terminal can be improved.
Detailed description of the invention
Fig. 1 is the applicable schematic network structure of the embodiment of the present invention；
Fig. 2 is the schematic network structure of the applicable CU-DU separation architecture of the embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of the separation architecture of CU provided in an embodiment of the present invention；
Fig. 4 is a kind of flow chart of the transmission method of uplink small data provided in an embodiment of the present invention；
Fig. 5 is the flow chart of the transmission method of another uplink small data provided in an embodiment of the present invention；
Fig. 6 is a kind of transmission schematic diagram of uplink small data provided in an embodiment of the present invention；
Fig. 7 is the structure chart of network side DU provided in an embodiment of the present invention a kind of；
Fig. 8 is the structure chart of another network side DU provided in an embodiment of the present invention；
Fig. 9 is the structure chart of network side CU provided in an embodiment of the present invention a kind of；
Figure 10 is the structure chart of another network side CU provided in an embodiment of the present invention；
Figure 11 is the structure chart of another network side DU provided in an embodiment of the present invention；
Figure 12 is the structure chart of another network side CU provided in an embodiment of the present invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
Referring to Figure 1, Fig. 1 is the applicable schematic network structure of the embodiment of the present invention, as shown in Figure 1, including user
Terminal (User Equipment, UE) 11, network side DU12 and network side CU13, wherein user terminal 11 can be mobile phone, put down
Plate computer (Tablet Personal Computer), laptop computer (Laptop Computer), personal digital assistant
(personal digital assistant, PDA), mobile Internet access device (Mobile Internet Device, MID) can
The terminal side equipments such as wearable device (Wearable Device), it should be noted that do not limit in embodiments of the present invention
The concrete type of user terminal 11.Network side DU12 and network side CU13 can be base station, such as: macro station, LTE eNB, 5G NR
NB etc.；Network side DU12 and network side CU13 are also possible to small station, as low power nodes (low power node, LPN),
The small stations such as pico, femto or network side DU12 and network side CU13 can be needed with access point (access point, AP)
It is bright, the concrete type of network side DU12 and network side CU13, and network side DU12 are not limited in embodiments of the present invention
It can be deployed in the same network side equipment with network side CU13, mutually independent heterogeneous networks side apparatus can also be deployed in
In.
Such as: it is respectively that gNB-DU and gNB-CU are illustrated with network side DU12 and network side CU13, such as Fig. 2 institute
Show, Fig. 2 is the schematic network structure of the applicable CU-DU separation architecture of the embodiment of the present invention.5G core net (5Next
Generation Core, 5GC) and Next Generation Access (Next Generation-Radio Access Network, NG-
RAN the transmission of data) can be carried out by NG interface.May exist multiple base stations 5G (gNB) under NG-RAN, it can be between gNB
The transmission of data is carried out by Xn-C interface.Wherein, may include gNB-CU and multiple gNB-DU in a gNB, gNB-CU with
The transmission of data can be carried out between gNB-DU by F1 interface, and a gNB-CU can manage one or more gNB-
DU。
Certainly, network side CU13 can be separated into CP and UP, can provide at this time refering to Fig. 3, Fig. 3 for the embodiment of the present invention
A kind of CU separation architecture schematic diagram.As shown in figure 3, a CU-CP can manage multiple CU-UP, and CU-CP and CU-
The interface carried out data transmission between UP is E1 interface.CU-CP and CU-UP can be interacted with DU, between CU-CP and DU
The interface interacted is F1-C, and the interface interacted between CU-UP and DU is F1-U.
Fig. 4 is referred to, Fig. 4 is a kind of flow chart of the transmission method of uplink small data provided in an embodiment of the present invention, such as
Shown in Fig. 4, comprising the following steps:
401, network side DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；
402, the network side DU sends the access request for being directed to the target terminal user to network side CU；
403, the context that the network side DU receives the target terminal user that the network side CU is initiated was established
Journey, to establish the context of the target terminal user；
404, the network side DU sends the uplink small data to the network side CU；
405, the network side DU sends replying message for the upstream message to the target terminal user.
Wherein, above-mentioned target terminal user can be any user terminal.Above-mentioned upstream message can be target user's end
The upstream message that end is sent to network side equipment in the random access procedure, such as: the message 3 (MSG3) of random access procedure.
In addition, above-mentioned upstream message may include certain information of target terminal user, and such as: the network capabilities letter of target terminal user
Breath, authentication information or identification information etc..Above-mentioned uplink small data can be understood as the smaller data of some data bulks,
Such as the communication message or the picture of small data quantity etc. of small data quantity, it is preferred that can be data bulk less than certain threshold
The data of value.Certainly, in addition to this small data can also be the smaller data of some other data bulks, real to this present invention
Example is applied to be not construed as limiting.The upstream message and uplink small data that target terminal user is sent can be uplink through a piece of news
Message and uplink small data are sent together, or are also possible to send upstream message respectively by two message and uplink is small
Data etc. are not construed as limiting this.
In addition, network side DU can be to network after above-mentioned network side DU receives above-mentioned upstream message and uplink small data
Side CU sends the access request for being directed to the target terminal user.Step 402, can be the network side DU do not retain it is non-swash
In the case where the context of the user terminal of state living, the network side DU sends whole for the target user to network side CU
The access request at end.The user terminal of inactive state can be, this kind of user terminals in inactive state.Wherein, this connects
Enter the whole that request may include above-mentioned upstream message, also may include the part messages in above-mentioned upstream message, such as: it can be with
Some related news including above-mentioned target terminal user context.Network side CU, can basis after receiving access request
The access request gets the context of above-mentioned target terminal user, so as to which the context of target terminal user to be sent to
The foundation of network side DU, network side CU and network side DU completion context.
Certainly, after network side CU receives above-mentioned access request, obtain target terminal user context can there are many
Implementation.Such as: network side CU can be previously stored with the context of above-mentioned target terminal user, so as to directly search
To the context of target terminal user.Or the feelings of the context in the network side CU not stored target terminal user
Under condition, network side CU can obtain the upper and lower of the target terminal user from the target BS that the target terminal user connected
Text etc..After the context that network side CU obtains target terminal user, so that it may it is whole to send target user to network side DU
The context at end.Wherein, above-mentioned target BS can be what target terminal user finally connected before entering inactive state
Base station, thus network side CU from target terminal user most latter linked base station (such as: last serving gNB) target user
The context of terminal.
Receive the context establishment process of the target terminal user of network side CU initiation in network side DU, to establish
After the context for stating target terminal user, network side DU sends uplink small data to network side CU, and network side CU can be at this time
The uplink small data that network side DU is sent is received, later, above-mentioned uplink small data can be sent to core net.And in network side DU
After sending uplink small data to network side CU, network side DU disappears to the reply that target terminal user sends above-mentioned upstream message
Breath, completes the transmission process of uplink small data.
It may be implemented through the above steps, it, can under inactive state before target terminal user does not enter connected state
Uplink small data is sent to network side DU, so that network side DU and network side CU are established after context, it can be quickly right
These uplink small datas are handled, so that the process of data transmission is simplified, without waiting until connected state target terminal user again
Uplink small data improves the efficiency of data transmission.
As an alternative embodiment, the upstream message includes:
RRC information or MAC CE message.
Wherein, it may include the Context identifier of above-mentioned target terminal user in RRC information or MAC CE message, it should
Context identifier can be inactive state Network Temporary Identifier (Inactive adio NetworkTemporary
Identifier, I-RNTI) or other identifier.After upstream message includes RRC information or MAC CE message, Ke Yifang
Just network side DU or network side CU obtains the context of above-mentioned target terminal user, consequently facilitating network side DU and network side CU
Between establish context.
As an alternative embodiment, if the upstream message includes the RRC information, the access request packet
Include the RRC information；Or
If the upstream message includes the MAC CE message, the access request includes the target terminal user
Context identifier, the Context identifier of the target terminal user are that the network side DU is obtained from the MAC CE message
's.
Wherein, if above-mentioned upstream message includes RRC information, access request includes RRC information.Since network side DU can not
The Context identifier that RRC information obtains target terminal user is unlocked, so needing for RRC information to be sent to network side CU.And net
Network side CU can unlock RRC information, be obtained with the information such as target terminal user Context identifier in this way, thus network
Side CU can search the context of target terminal user by the Context identifier.Network side CU obtains target user's end in lookup
After the context at end, so that it may establish the connection of context with network side DU.
In addition, access request includes the context of target terminal user if above-mentioned upstream message includes MAC CE message
Mark, the Context identifier of target terminal user are what network side DU was obtained from the MAC CE message.Due to network side DU
The Context identifier that target terminal user can be obtained directly from MAC CE message, only needs to send Context identifier at this time
Network side CU is given, so that network side CU can search the context of target terminal user by the Context identifier.
Certainly, network side CU is ok no matter obtaining the Context identifier of target terminal user by which kind of above-mentioned mode
The context of target terminal user is found, so as to establish context between network side DU, i.e., lookup is obtained upper
Hereafter it is sent to network side DU.The Context identifier of target terminal user, such as in I-RNTI, may exist target terminal user
The relevant information for the cell taken over, thus in the context of the not stored target terminal user of network side CU, it can be small from these
The user's context of target terminal user is obtained in area.Preferably, there may be target terminal user last times in I-RNTI
The relevant information of the cell connected.
As an alternative embodiment, if the upstream message includes the RRC information, the RRC information
It replies message and receives replying message for the network side CU transmission for the network side DU；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network
What side DU was generated.
Wherein, if above-mentioned upstream message includes RRC information, then replying message for RRC information can be generated in network side CU,
It is sent to network side DU to which network side CU can reply message this, so that network side DU, which can will be replied message, is sent to mesh
Mark user terminal.If above-mentioned upstream message includes MAC CE message, then network side DU can directly generate MAC CE message
It replies message, target terminal user is sent to so as to will directly reply message, to improve efficiency.
In addition, above-mentioned reply message may also be referred to as above-mentioned RRC information or MAC CE message response message, target user
Terminal receives reply message after, into connected state, can be attached later state data transmission.
As an alternative embodiment, in the case where the CP and UP of the network side CU separation, the network side
DU sends the uplink small data to the network side CU, comprising:
The network side DU sends the uplink small data to the UP of the network side CU.
Wherein, network side DU sends uplink small data to the UP of network side CU, so that the UP of network side CU can receive net
The uplink small data for the target terminal user that network side DU is sent, and then these uplink small datas can be sent to user plane function
Energy (User Plane Function, UPF).
Certainly, network side DU sends uplink small data to network side CU and can be, and network side DU is successfully accessed sound receiving
Ying Hou can configure corresponding Data Radio Bearer (Data Radio Bearer, DRB) and tunnel, then by the DRB and
Tunnel is issued to the UP of network side CU or network side CU by uplink small data.
As an alternative embodiment, the method also includes:
The network side DU receives the deletion notice that the network side CU is sent, and the deletion notice is for notifying the net
Network side DU deletes the context of the user terminal of inactive state；
The network side DU deletes the context of the user terminal of inactive state.
Wherein, target terminal user can be target terminal user and receiving what network side equipment was sent in inactive state
After some message, hence into inactive state.Then, network side CU can send to network side DU and delete notice, network side
DU deletes the context of the user terminal of inactive state after receiving deletion notice.To which only network side CU retains
There is the context of the user terminal of inactive state, there is no the contexts of the user terminal of inactive state by network side DU.In this way, can
Think that network side DU saves certain memory space.
The reality it should be noted that embodiment for the plurality of optional introduced in the embodiment of the present invention can be combined with each other each other
It is existing, it can also be implemented separately, this embodiment of the present invention is not construed as limiting.
In this way, network side DU receives the upstream message that the target terminal user of inactive state is sent in the embodiment of the present invention
And uplink small data；The network side DU sends the access request for being directed to the target terminal user to network side CU；The net
Network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, and is used with establishing the target
The context of family terminal；The network side DU sends the uplink small data to the network side CU；The network side DU is to institute
It states target terminal user and sends replying message for the upstream message.Compared with the existing technology, the embodiment of the invention provides one
The transmission method of kind uplink small data, so as to support the uplink small data under inactive state under CU and DU separation architecture
Transmission.Before target terminal user does not enter connected state, uplink small data can be sent to network under inactive state
Side DU can quickly be handled these uplink small datas so that network side DU and network side CU are established after context, from
And the process of data transmission is simplified, without waiting until connected state user terminal uplink small data again, improve the effect of data transmission
Rate.
Fig. 5 is referred to, Fig. 5 is the flow chart of the transmission method of another uplink small data provided in an embodiment of the present invention,
As shown in Figure 5, comprising the following steps:
501, network side CU receives the access request for the target terminal user that network side DU is sent for inactive state；
502, the network side CU obtains the context of the target terminal user；
503, the network side CU initiates the context establishment process of the target terminal user to the network side DU；
504, the network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
Optionally, the network side CU obtains the context of the target terminal user, comprising:
The network side CU obtains the context of the pre-stored target terminal user of the network side CU；Or
In the case where the context of the not stored target terminal user of the network side CU, the network side CU is from institute
State the context that the target BS that target terminal user connected obtains the target terminal user.
Optionally, the network side CU obtains the context of the target terminal user, comprising:
If the access request includes the RRC information of the target terminal user, the network side CU disappears from the RRC
The Context identifier of the target terminal user is obtained in breath, and according to the Context identifier, it is whole to obtain the target user
The context at end；Or
If the access request includes the Context identifier of the target terminal user, the network side CU is according to
Context identifier obtains the context of the target terminal user.
Optionally, in the case where the CP and UP of the network side CU separation, the network side CU receives the network side
The uplink small data for the target terminal user that DU is sent, comprising:
The UP of the network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
Optionally, the method also includes:
The network side CU is sent to the network side DU deletes notice, and the deletion notice is for notifying the network side
DU deletes the context of the user terminal of inactive state.
It should be noted that the present embodiment as with the embodiment of network side CU corresponding in embodiment shown in Fig. 4,
Its specific embodiment may refer to the related description of embodiment shown in Fig. 4, and in order to avoid repeated explanation, the present embodiment is not
It repeats again, and may also reach up identical beneficial effect.
It is illustrated below with transmission method of multiple embodiments to uplink small data provided in an embodiment of the present invention:
Embodiment 1:
Network side CU and network side DU can be respectively gNB-CU and gNB-DU.GNB-DU does not retain under inactive state
The context of UE, then gNB-DU can initiate F1 to gNB-CU and be initially accessed when receiving the uplink small data of UE transmission
Process, gNB-CU be gNB-DU establish UE context, then the uplink small data of UE is issued gNB-CU by gNB-DU.
Referring to Fig. 6, Fig. 6 is a kind of transmission schematic diagram of uplink small data provided in an embodiment of the present invention.UE first to
GNB-DU sends random access request, and gNB-DU replys random access response to UE.To which UE disappears RRC information or MAC CE
Breath is sent to gNB-DU, and uplink small data is sent to gNB-DU simultaneously.In the RRC information or MAC CE for receiving UE,
And after uplink small data, gNB-DU can initiate access procedure to gNB-CU, will be in RRC information or MAC CE message
Hold (especially UE Context identifier, such as I-RNTI) and gNB-CU is issued by F1 signaling.
Wherein, above-mentioned F1 signaling is the signaling that gNB-DU and gNB-CU are sent by F1 interface.GNB-CU is according to I-RNTI
The context of UE is found, and replys the access request of gNB-DU.If gNB-CU does not store the context of the UE, gNB-
CU initiates context acquisition process, after gNB-CU takes UE context, meeting and gNB-DU to old serving cell according to I-RNTI
Between establish UE context, then will access response notice gNB-DU.
In addition, gNB-DU is in the RRC information or MACCE message for receiving UE, Yi Jishang in the case where CP UP separation
After row small data, access procedure can be initiated to CU CP；CU CP can according to UE Context identifier (such as I-RNTI) come
Address UE context；UE context is established between CU CP meeting and gNB-DU, and access is then responded into notice gNB-DU.gNB-DU
After receiving and being successfully accessed response, corresponding DRB and tunnel are configured, data are then issued into gNB-CU CU UP.gNB-DU
The result of RRC information or MAC CE message is replied to UE.And UE can be switched to connected state or be switched to inactive state.
And gNB-CU can carry out the response of upstream data or the transmission of downlink data at this time, gNB-CU can also carry out upstream data
Response or downlink data transmission.
Embodiment 2:
UE is specifically introduced in the present embodiment to access network by RRC information while sending small data.
Step 1, gNB-DU receive the RRC information and uplink small data of some inactive state UE；
Step 2, gNB-DU pass the message to gNB-CU；
Step 3, gNB-CU unlock the RRC information, obtain the information such as UE Context identifier, gNB-CU is according to UE context mark
Knowledge looks for UE context, and may exist following two situation at this time:
Situation 1: the gNB-CU has the context of the UE, then gNB-CU can initiate context establishment process to gNB-DU,
RRC information can be sent to UE after being successfully established to respond the request message of UE (message is sent to UE by gNB-DU)；
Situation 2: the gNB-CU does not save the context of the UE, then gNB-CU can go to find according to the Context identifier of UE
Old serving BS goes to obtain the context of UE, and the process after obtaining successfully is same as above.
Step 4, after UE context is successfully established on F1 interface (interface between gNB-DU and gNB-CU), gNB-DU can
The uplink small data from UE is sent to gNB-CU.
In the present embodiment, gNB-DU needs to initiate initial access process to gNB-CU, because gNB-DU can not unlock RRC and disappear
Breath, to can not know the Context identifier of UE.RRC information is sent to gNB-CU by gNB-DU, and gNB-CU can unlock RRC and disappear
Breath, to obtain the Context identifier of UE, searches the context of UE.
Embodiment 3:
UE is specifically introduced in the present embodiment to access network by MAC CE while sending small data.
Step 1, gNB-DU receive the MAC CE message and upstream data of some inactive state UE；
Step 2, gNB-DU obtain the Context identifier of the UE, such as I-RNTI from MAC CE message；
Step 3, gNB-DU initiate initial access process to gNB-CU, at least to include UE Context identifier in message, than
Such as: I-RNTI；
Step 4, gNB-CU look for UE context according to UE Context identifier, if gNB-CU does not store the upper of the UE
Hereafter then the process that UE context obtains can be initiated to old serving cell according to UE Context identifier.
Step 5, after gNB-CU obtains the context of UE, gNB-CU can to gNB-DU initiate UE context establish
Journey.
After UE context is successfully established in step 6, F1 interface, gNB-DU can hold the upstream data of UE in corresponding data
GNB-CU is issued in load.
After UE context is successfully established in step 7, F1 interface, gNB-CU replys the response being successfully accessed to gNB-DU.
Step 8, gNB-DU reply the response message of MAC CE message to UE.
In the present embodiment, gNB-DU can obtain the Context identifier of UE directly from MAC CE message, to directly will
The Context identifier is sent to gNB-CU, so that gNB-CU can search the context of UE according to the Context identifier.
Interaction between gNB-DU and gNB-CU specifically may refer in preceding embodiment, not repeat herein.
Fig. 7 is referred to, Fig. 7 is the structure chart of network side DU provided in an embodiment of the present invention a kind of, as shown in fig. 7, network
Side DU700, comprising:
First receiving module 701, the upstream message and uplink that the target terminal user for receiving inactive state is sent are small
Data；
First sending module 702, for sending the access request for being directed to the target terminal user to network side CU；
Receiving module 703, the context for receiving the target terminal user that the network side CU is initiated were established
Journey, to establish the context of the target terminal user；
Second sending module 704, for sending the uplink small data to the network side CU；
Third sending module 705, for sending replying message for the upstream message to the target terminal user.
Optionally, the upstream message includes:
RRC information or MAC CE message.
Optionally, if the upstream message includes the RRC information, the access request includes the RRC information；Or
Person
If the upstream message includes the MAC CE message, the access request includes the target terminal user
Context identifier, the Context identifier of the target terminal user are that the network side DU is obtained from the MAC CE message
's.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net
Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network
What side DU was generated.
Optionally, in the case where the CP and UP of the network side CU separation, second sending module 704 is used for: institute
It states network side DU and sends the uplink small data to the UP of the network side CU.
Optionally, as shown in figure 8, the network side DU700 further include:
Second receiving module 706, the deletion notice sent for receiving the network side CU, the deletion notice is for leading to
Know that the network side DU deletes the context of the user terminal of inactive state；
Removing module 707, the context of the user terminal for deleting inactive state.
It should be noted that above-mentioned network side DU700 can be embodiment of the method in the embodiment of the present invention in the present embodiment
In any embodiment network side DU, any embodiment of network side DU all may be used in embodiment of the method in the embodiment of the present invention
To be realized by the above-mentioned network side DU700 in the present embodiment, and reach identical beneficial effect, details are not described herein again.
Fig. 9 is referred to, Fig. 9 is the structure chart of network side CU provided in an embodiment of the present invention a kind of, as shown in figure 9, network
Side CU900 includes:
First receiving module 901 sends the access of the target terminal user for inactive state for receiving network side DU
Request；
Module 902 is obtained, for obtaining the context of the target terminal user；
Initiation module 903, for initiating the context establishment process of the target terminal user to the network side DU；
Second receiving module 904, for receiving the uplink decimal for the target terminal user that the network side DU is sent
According to.
Optionally, the acquisition module 902, is used for: it is whole to obtain the pre-stored target user of the network side CU
The context at end；Or in the case where the context of the not stored target terminal user of the network side CU, from the mesh
The target BS that mark user terminal connected obtains the context of the target terminal user.
Optionally, the acquisition module 902, is used for: if the RRC that the access request includes the target terminal user disappears
Breath, then obtain the Context identifier of the target terminal user, and according to the Context identifier, obtain from the RRC information
Take the context of the target terminal user；If the access request includes the context mark of the target terminal user
Know, then according to the Context identifier, obtains the context of the target terminal user.
Optionally, in the case where the CP and UP of the network side CU separation, second receiving module 904 is used for: institute
The UP for stating network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
Optionally, as shown in Figure 10, the network side CU900 further include:
Sending module 905 deletes notice for sending to the network side DU, and the deletion notice is for notifying the net
Network side DU deletes the context of the user terminal of inactive state.
It should be noted that above-mentioned network side CU900 can be embodiment of the method in the embodiment of the present invention in the present embodiment
In any embodiment network side CU, any embodiment of network side CU all may be used in embodiment of the method in the embodiment of the present invention
To be realized by the above-mentioned network side CU900 in the present embodiment, and reach identical beneficial effect, details are not described herein again.
Figure 11 is please referred to, Figure 11 is the structure chart of another network side DU provided in an embodiment of the present invention, as shown in figure 11,
Network side DU includes: transceiver 1110, memory 1120, processor 1100 and is stored on the memory 1120 and can be
The computer program run on the processor, in which:
The transceiver 1110, for receiving the upstream message and uplink decimal that the target terminal user of inactive state is sent
According to；
The access request for being directed to the target terminal user is sent to network side CU；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target
The context of user terminal；
The uplink small data is sent to the network side CU；
Replying message for the upstream message is sent to the target terminal user.
Wherein, transceiver 1110 can be used for sending and receiving data under the control of processor 1100.
In Figure 11, bus architecture may include the bus and bridge of any number of interconnection, specifically by 1100 generation of processor
The various circuits for the memory that the one or more processors and memory 1120 of table represent link together.Bus architecture may be used also
To link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like, these are all
It is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 1110 can
To be multiple element, that is, includes transmitter and receiver, the list for communicating over a transmission medium with various other devices is provided
Member.
Processor 1100, which is responsible for management bus architecture and common processing, memory 1120, can store processor 1100 and exists
Execute used data when operation.
It should be noted that memory 1120 does not limit only on network side DU, it can be by memory 1120 and processing
The separation of device 1100 is in different geographical locations.
Optionally, the upstream message includes:
RRC information or MAC CE message.
Optionally, which is characterized in that if the upstream message includes the RRC information, the access request includes institute
State RRC information；Or
If the upstream message includes the MAC CE message, the access request includes the target terminal user
Context identifier, the Context identifier of the target terminal user are that the network side DU is obtained from the MAC CE message
's.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net
Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network
What side DU was generated.
Optionally, described to described in the network side CU transmission in the case where CP and UP of the network side CU separation
Uplink small data, comprising:
The uplink small data is sent to the UP of the network side CU.
Optionally, the transceiver 1110, is also used to receive the deletion notice that the network side CU is sent, and described delete is led to
Know for notifying the network side DU to delete the context of the user terminal of inactive state；
The processor 1100, is also used to delete the context of the user terminal of inactive state.
It should be noted that above-mentioned network side DU can be in the embodiment of the present invention in embodiment of the method and appoint in the present embodiment
The network side DU for embodiment of anticipating, any embodiment of network side DU can be by embodiment of the method in the embodiment of the present invention
Above-mentioned network side DU in the present embodiment is realized, and reaches identical beneficial effect, and details are not described herein again.
Figure 12 is please referred to, Figure 12 is the structure chart of another network side CU provided in an embodiment of the present invention, as shown in figure 12,
Network side CU includes: transceiver 1210, memory 1220, processor 1200 and is stored on the memory 1220 and can be
The computer program run on the processor, in which:
The transceiver 1210, the access that the target terminal user for being directed to inactive state is sent for receiving network side DU are asked
It asks；
Obtain the context of the target terminal user；
The context establishment process of the target terminal user is initiated to the network side DU；
Receive the uplink small data for the target terminal user that the network side DU is sent.
Wherein, transceiver 1210 can be used for sending and receiving data under the control of processor 1200.
In Figure 12, bus architecture may include the bus and bridge of any number of interconnection, specifically by 1200 generation of processor
The various circuits for the memory that the one or more processors and memory 1220 of table represent link together.Bus architecture may be used also
To link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like, these are all
It is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 1210 can
To be multiple element, that is, includes transmitter and receiver, the list for communicating over a transmission medium with various other devices is provided
Member.
Processor 1200, which is responsible for management bus architecture and common processing, memory 1220, can store processor 1200 and exists
Execute used data when operation.
It should be noted that memory 1220 does not limit only on network side CU, it can be by memory 1220 and processing
The separation of device 1200 is in different geographical locations.
Optionally, the context for obtaining the target terminal user, comprising:
Obtain the context of the pre-stored target terminal user of the network side CU；Or
It is whole from the target user in the case where context of the not stored target terminal user of the network side CU
The target BS connected is held to obtain the context of the target terminal user.
Optionally, the context for obtaining the target terminal user, comprising:
If the access request includes the RRC information of the target terminal user, from the RRC information described in acquisition
The Context identifier of target terminal user, and according to the Context identifier, obtain the context of the target terminal user；Or
Person
If the access request includes the Context identifier of the target terminal user, according to the Context identifier,
Obtain the context of the target terminal user.
Optionally, described to receive what the network side DU was sent in the case where the CP and UP of the network side CU separation
The uplink small data of the target terminal user, comprising:
The UP of the network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
Optionally, the transceiver 1210, which is also used to send to the network side DU, deletes notice, and the deletion notice is used
In notifying the network side DU to delete the context of the user terminal of inactive state.
It should be noted that above-mentioned network side CU can be in the embodiment of the present invention in embodiment of the method and appoint in the present embodiment
The network side CU for embodiment of anticipating, any embodiment of network side CU can be by embodiment of the method in the embodiment of the present invention
Above-mentioned network side CU in the present embodiment is realized, and reaches identical beneficial effect, and details are not described herein again.
The embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with computer program, the program
The step in the transmission method of the uplink small data of network side DU provided in an embodiment of the present invention is realized when being executed by processor, or
Person's program is realized when being executed by processor in the transmission method of the uplink small data of network side CU provided in an embodiment of the present invention
The step of.
In several embodiments provided herein, it should be understood that disclosed method and apparatus, it can be by other
Mode realize.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
For a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can combine
Or it is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed phase
Coupling, direct-coupling or communication connection between mutually can be through some interfaces, the INDIRECT COUPLING or communication of device or unit
Connection can be electrical property, mechanical or other forms.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that the independent physics of each unit includes, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes receiving/transmission method described in each embodiment of the present invention
Part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, abbreviation
ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic or disk etc. are various can store
The medium of program code.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (25)
1. a kind of transmission method of uplink small data characterized by comprising
Network side distributed unit DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；
The network side DU sends the access request for being directed to the target terminal user to network side centralized unit CU；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, to establish
The context of the target terminal user；
The network side DU sends the uplink small data to the network side CU；
The network side DU sends replying message for the upstream message to the target terminal user.
2. the method as described in claim 1, which is characterized in that the upstream message includes:
The control unit MAC CE message of radio resource control RRC message or media access control.
3. method according to claim 2, which is characterized in that
If the upstream message includes the RRC information, the access request includes the RRC information；Or
If the upstream message includes the MAC CE message, the access request includes the upper and lower of the target terminal user
Text mark, the Context identifier of the target terminal user network side DU are obtained from the MAC CE message.
4. method as claimed in claim 2 or claim 3, which is characterized in that
If the upstream message includes the RRC information, replying message for the RRC information receives institute for the network side DU
State replying message for network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network side DU
It generates.
5. method as claimed in claim 2 or claim 3, which is characterized in that in the control plane CP and user face UP of the network side CU
In the case where separation, the network side DU sends the uplink small data to the network side CU, comprising:
The network side DU sends the uplink small data to the UP of the network side CU.
6. the method as described in claim 1, which is characterized in that the method also includes:
The network side DU receives the deletion notice that the network side CU is sent, and the deletion notice is for notifying the network side
DU deletes the context of the user terminal of inactive state；
The network side DU deletes the context of the user terminal of inactive state.
7. a kind of transmission method of uplink small data characterized by comprising
Network side CU receives the access request for the target terminal user that network side DU is sent for inactive state；
The network side CU obtains the context of the target terminal user；
The network side CU initiates the context establishment process of the target terminal user to the network side DU；
The network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
8. the method for claim 7, which is characterized in that the network side CU obtains the upper and lower of the target terminal user
Text, comprising:
The network side CU obtains the context of the pre-stored target terminal user of the network side CU；Or
In the case where the context of the not stored target terminal user of the network side CU, the network side CU is from the mesh
The target BS that mark user terminal connected obtains the context of the target terminal user.
9. the method for claim 7, which is characterized in that the network side CU obtains the upper and lower of the target terminal user
Text, comprising:
If the access request includes the RRC information of the target terminal user, the network side CU is from the RRC information
The Context identifier of the target terminal user is obtained, and according to the Context identifier, obtains the target terminal user
Context；Or
If the access request includes the Context identifier of the target terminal user, the network side CU is according to described upper and lower
Text mark, obtains the context of the target terminal user.
10. the method as described in any one of claim 7 to 9, which is characterized in that separated in the CP and UP of the network side CU
In the case where, the network side CU receives the uplink small data for the target terminal user that the network side DU is sent, comprising:
The UP of the network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
11. the method for claim 7, which is characterized in that the method also includes:
The network side CU is sent to the network side DU deletes notice, and the deletion notice is for notifying the network side DU to delete
Unless the context of the user terminal of activated state.
12. a kind of network side DU characterized by comprising
First receiving module, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
First sending module, for sending the access request for being directed to the target terminal user to network side CU；
Receiving module, for receiving the context establishment process for the target terminal user that the network side CU is initiated, to build
Found the context of the target terminal user；
Second sending module, for sending the uplink small data to the network side CU；
Third sending module, for sending replying message for the upstream message to the target terminal user.
13. a kind of network side CU characterized by comprising
First receiving module sends the access request of the target terminal user for inactive state for receiving network side DU；
Module is obtained, for obtaining the context of the target terminal user；
Initiation module, for initiating the context establishment process of the target terminal user to the network side DU；
Second receiving module, for receiving the uplink small data for the target terminal user that the network side DU is sent.
14. a kind of network side DU, comprising: transceiver, memory, processor and be stored on the memory and can be at the place
The computer program run on reason device, which is characterized in that
The transceiver, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
The access request for being directed to the target terminal user is sent to network side CU；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target user
The context of terminal；
The uplink small data is sent to the network side CU；
Replying message for the upstream message is sent to the target terminal user.
15. network side DU as claimed in claim 14, which is characterized in that the upstream message includes:
RRC information or MAC CE message.
16. network side DU as claimed in claim 15, which is characterized in that
If the upstream message includes the RRC information, the access request includes the RRC information；Or
If the upstream message includes the MAC CE message, the access request includes the upper and lower of the target terminal user
Text mark, the Context identifier of the target terminal user network side DU are obtained from the MAC CE message.
17. the network side DU as described in claim 15 or 16, which is characterized in that
If the upstream message includes the RRC information, replying message for the RRC information receives institute for the network side DU
State replying message for network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network side DU
It generates.
18. the network side DU as described in claim 15 or 16, which is characterized in that separated in the CP and UP of the network side CU
In the case of, it is described to send the uplink small data to the network side CU, comprising:
The uplink small data is sent to the UP of the network side CU.
19. network side DU as claimed in claim 14, which is characterized in that the transceiver is also used to receive the network side
CU send deletion notice, it is described delete notice for notify the network side DU delete the user terminal of inactive state up and down
Text；
The processor is also used to delete the context of the user terminal of inactive state.
20. a kind of network side CU, comprising: transceiver, memory, processor and be stored on the memory and can be at the place
The computer program run on reason device, which is characterized in that
The transceiver sends the access request of the target terminal user for inactive state for receiving network side DU；
Obtain the context of the target terminal user；
The context establishment process of the target terminal user is initiated to the network side DU；
Receive the uplink small data for the target terminal user that the network side DU is sent.
21. network side CU as claimed in claim 20, which is characterized in that above and below the acquisition target terminal user
Text, comprising:
Obtain the context of the pre-stored target terminal user of the network side CU；Or
In the case where the context of the not stored target terminal user of the network side CU, connect from the target terminal user
The target BS taken over obtains the context of the target terminal user.
22. network side CU as claimed in claim 20, which is characterized in that above and below the acquisition target terminal user
Text, comprising:
If the access request includes the RRC information of the target terminal user, the target is obtained from the RRC information
The Context identifier of user terminal, and according to the Context identifier, obtain the context of the target terminal user；Or
If the access request includes the Context identifier of the target terminal user, according to the Context identifier, obtain
The context of the target terminal user.
23. the network side CU as described in any one of claim 20 to 22, which is characterized in that the network side CU CP and
In the case that UP is separated, the uplink small data for receiving the target terminal user that the network side DU is sent, comprising:
The UP of the network side CU receives the uplink small data for the target terminal user that the network side DU is sent.
24. network side CU as claimed in claim 20, which is characterized in that the transceiver is also used to send out to the network side DU
Deletion is sent to notify, the deletion notice is for notifying the network side DU to delete the context of the user terminal of inactive state.
25. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
The step or the program in the transmission method such as uplink small data described in any one of claims 1 to 6 are realized when execution
The step in the transmission method of the uplink small data as described in any one of claim 7 to 11 is realized when being executed by processor.
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