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CN108924904B - Uplink data transmission method, device and equipment - Google Patents

Uplink data transmission method, device and equipment Download PDF

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Publication number
CN108924904B
CN108924904B CN201710223621.XA CN201710223621A CN108924904B CN 108924904 B CN108924904 B CN 108924904B CN 201710223621 A CN201710223621 A CN 201710223621A CN 108924904 B CN108924904 B CN 108924904B
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China
Prior art keywords
information
network element
access network
control channel
downlink control
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CN108924904A (en
Inventor
艾建勋
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ZTE Corp
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ZTE Corp
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Priority to CN201710223621.XA priority Critical patent/CN108924904B/en
Priority to PCT/CN2018/080726 priority patent/WO2018184490A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a method, a device and equipment for transmitting uplink data, wherein the method comprises the following steps: sending User Equipment (UE) state indication information to a second access network element; and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.

Description

Uplink data transmission method, device and equipment
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, and a device for transmitting uplink data.
Background
In the 3GPP LTE,3rd Generation Partnership Project Long Term Evolution (Long Evolution) system, a new Radio Resource Control (RRC) state, referred to herein as the RRC Inactive state, is introduced. For the UE in this state, both the network element (core network and access network element) on the network side and the UE keep Access Stratum (AS) context information of the UE, where the AS context information includes configuration information of SRBs and DRBs of the UE, configuration information of user plane protocol layers (PDCP, RLC) and (possible) state information. Meanwhile, the UE behaves like a UE in an RRC IDLE (IDLE) state, i.e.: the UE in this state is not allocated dedicated radio resources on the radio interface. The network element on the network side maintains the connection between the control plane and the user plane from the core network to the network element on the access network for the UE in this state, that is, from the viewpoint of the core network, the UE is in an RRC CONNECTED state (RRC CONNECTED state). The access network element that maintains the AS context information of the UE is referred to AS an anchor network element (anchor gbb, for example) of the UE.
In the discussion of 3GPP, a requirement for a UE in an inactive state to transmit uplink data is proposed. In the process of sending uplink data in the inactive state, the access network element may transfer the RRC state of the UE to the RRC connected state or maintain the RRC connected state.
The 3GPP also defines a Radio Notification Area (RNA) for the radio access network, and cells belonging to different access network elements may belong to the same RNA. When the UE moves in the same RNA, it may camp (camp) on a cell under an access network element different from its anchor network element, and initiate an RRC connection recovery procedure (RRC resume) in the cell or send uplink data in an inactive state. When the UE initiates transmission of inactive uplink data in a cell different from its anchor Network element, it is called that the new access Network element is a serving access Network element or a serving Network element (serving Network element).
When the UE initiates the transmission of the uplink data in the inactive state, if the anchor network element and the serving network element belong to different network elements, how the access network determines the subsequent RRC state of the UE, and how to save the battery consumption of the UE in the process is a problem to be solved.
Disclosure of Invention
In order to solve the existing technical problem, embodiments of the present invention provide a method, an apparatus, and a device for transmitting uplink data.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a method for transmitting uplink data, which comprises the following steps:
sending the UE state indication information to a second access network element;
the UE status indication information is used by the second access network element to determine a connection status of the UE in subsequent interaction.
Wherein the UE status indication information comprises one or more of the following information:
the size of downlink data of the UE buffered by a first access network element;
whether a first access network element caches downlink data of the UE or not;
RRC state transition indication of the UE;
a part of one RRC message.
Wherein the RRC state transition indication of the UE is as follows: when the UE is instructed to be kept in the inactive state, the UE state indication information further comprises one or more of the following information:
indicating whether the UE needs to keep monitoring the downlink control channel for a period of time;
instructing the UE to keep monitoring the time length information of the downlink control channel;
instructing the UE to start monitoring time offset information of a downlink control channel;
instructing the UE to keep monitoring Discontinuous Reception (DRX) information of a downlink control channel.
Optionally, before sending the UE status indication information to the second access network element, the method further includes:
and receiving the information of the UE uplink data buffer sent by the second access network element.
Wherein the information of the UE uplink data buffer comprises one or more of the following information:
the UE reports a physical address control unit (BSR MAC CE) through a buffer state carried by the message1 or the message 3;
whether UE has uplink data to be sent;
the size of uplink data to be sent by the UE;
a logical channel of uplink data that the UE needs to transmit and a data size of each logical channel.
Optionally, before the sending the UE status indication information to the second access network element, the method further includes:
and determining the content of the UE state indication information according to whether the buffered downlink data of the UE or the size of the buffered downlink data of the UE exists or not, and/or historical behavior information of the UE, and/or information of an uplink data buffer zone of the UE.
The embodiment of the invention also provides a method for transmitting uplink data, which comprises the following steps:
receiving UE state indication information sent by a first access network element;
and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.
Wherein the UE status indication information comprises one or more of the following information:
the size of downlink data of the UE buffered by the first access network element;
whether a first access network element caches downlink data of the UE or not;
an RRC state transition indication of the UE;
a part of one RRC message.
Optionally, before receiving the UE status indication information sent by the first access network element, the method further includes:
and sending the information of the UE uplink data buffer to the first access network element.
Optionally, if the second access network element determines that the UE subsequently wants to monitor the downlink control channel according to the UE status indication information,
after receiving the UE status indication information sent by the first access network element, the method further includes:
sending one or more of the following information to the UE:
an indication of whether a downlink control channel needs to be monitored;
UE monitors the time offset of a downlink control channel;
the UE monitors the time length of a downlink control channel;
and the UE monitors DRX configuration information of a downlink control channel.
Optionally, after receiving the UE status indication information sent by the first access network element, the method further includes:
and informing the UE of the time information of the UE monitoring the downlink control channel.
The time information of the UE monitoring the downlink control channel is any one of the following information:
time offset information;
time offset information and time length information;
DRX configuration information, including: DRX period and time period information of monitoring the downlink control channel in one DRX period.
The embodiment of the invention also provides a transmission method of uplink data, which comprises the following steps:
and the third access network element sends the time information of the UE monitoring the downlink control channel to the UE.
The time information of the UE monitoring the downlink control channel is any one of the following information:
time offset information;
time offset information and time length information;
DRX configuration information, including: DRX period and time period information of monitoring the downlink control channel in one DRX period.
The embodiment of the invention also provides a method for transmitting uplink data, which comprises the following steps:
and receiving the time information of the UE monitoring the downlink control channel sent by the third access network element.
Optionally, after receiving the time information of monitoring the downlink control channel by the UE sent by the third access network element, the method further includes:
and monitoring the downlink control channel according to the time information of the downlink control channel monitored by the UE.
The embodiment of the invention also provides a device for transmitting uplink data, which comprises:
the first sending module is used for sending the UE state indication information to a second access network element;
and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.
Optionally, the apparatus further comprises:
and the first receiving module is used for receiving the information of the UE uplink data buffer area sent by the second access network element before the first sending module sends the UE state indication information to the second access network element.
Optionally, the apparatus further comprises:
a first determining module, configured to determine content of the UE status indication information according to whether there is buffered downlink data of the UE or size of the buffered downlink data of the UE, and/or historical behavior information of the UE, and/or information of the UE uplink data buffer.
An embodiment of the present invention further provides an access network element, where the access network element includes: the above-mentioned uplink data transmission device.
The embodiment of the invention also provides a device for transmitting uplink data, which comprises:
the second receiving module is used for receiving the UE state indication information sent by the first access network element;
and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.
Optionally, the apparatus further comprises:
and a second sending module, configured to send the information of the UE uplink data buffer to the first access network element before the second receiving module receives the UE status indication information sent by the first access network element.
Optionally, if the second access network element determines that the UE is to keep monitoring the downlink control channel subsequently according to the UE status indication information,
after the second receiving module receives the UE status indication information sent by the first access network element, the second sending module is further configured to send one or more of the following information to the UE:
an indication of whether a downlink control channel needs to be monitored;
UE monitors the time offset of a downlink control channel;
the UE monitors the time length of a downlink control channel;
and the UE monitors DRX configuration information of a downlink control channel.
Optionally, after the second receiving module receives the UE status indication information sent by the first access network element,
the second sending module is further configured to notify the UE of time information for the UE to monitor the downlink control channel.
An embodiment of the present invention further provides an access network element, where the access network element includes: the above-mentioned uplink data transmission device.
An embodiment of the present invention further provides a device for transmitting uplink data, where the device includes:
and the third sending module is used for sending the time information of the UE monitoring the downlink control channel to the UE.
An embodiment of the present invention further provides an access network element, where the access network element includes: the transmission device of the uplink data.
An embodiment of the present invention further provides a device for transmitting uplink data, where the device includes:
and the third receiving module is used for receiving the time information of the UE monitoring the downlink control channel, which is sent by the third access network element.
Optionally, the apparatus further comprises:
and the monitoring module is used for monitoring the downlink control channel according to the time information of the UE monitoring the downlink control channel.
An embodiment of the present invention further provides a terminal device, where the terminal device includes: the above-mentioned uplink data transmission device.
The method, the device and the equipment for transmitting the uplink data provided by the embodiment of the invention send the UE state indication information to a second access network element; the UE status indication information is used by the second access network element to determine a connection status of the UE in subsequent interaction. The service network element of the embodiment of the invention can determine the state of the UE before the path switch (path switch) is finished according to the UE state indication information and switch the state of the UE. For example: if the downlink data and the uplink data are not buffered, the service network element can send a message to indicate that the UE is kept in an inactive state as soon as possible and stops monitoring the downlink control channel, so that the time for the UE to monitor the downlink control channel can be reduced, and the electric energy consumption of the UE is saved.
In addition, the embodiment of the invention also sends the time information of the UE monitoring the downlink control channel to the UE without waiting for the RRC message responding to the UE to be sent together after the interaction between the service network element and the anchor network element is finished, so that the UE with the failure in contention resolution can re-initiate the Random Access Channel (RACH) process as soon as possible, and the UE with the success in contention resolution monitors the downlink control channel according to the time information of the UE monitoring the downlink control channel, thereby saving the battery consumption of the UE.
Drawings
Fig. 1 is a first flowchart illustrating a method for transmitting uplink data according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a transmission method of uplink data according to an embodiment of the present invention;
fig. 3 is a third schematic flow chart illustrating a transmission method of uplink data according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a transmission method of uplink data according to a fourth embodiment of the present invention;
fig. 5 is a schematic flow chart of a method for transmitting uplink data according to an embodiment of the present invention;
fig. 6 is a first schematic structural diagram of an uplink data transmission apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a transmission apparatus for uplink data according to an embodiment of the present invention;
fig. 8 is a third schematic structural diagram of an uplink data transmission device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a transmission apparatus of uplink data according to a fourth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a device for transmitting uplink data according to an embodiment of the present invention;
fig. 11 is a schematic diagram illustrating a process in which an inactive UE initiates uplink data transmission in a serving network element in the related art;
fig. 12 is a diagram illustrating a four-step RACH procedure in the related art;
fig. 13 is a diagram illustrating a two-step RACH procedure in the related art;
fig. 14 is a schematic diagram illustrating a process in which a UE initiates uplink data transmission in a four-step RACH procedure according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a process in which a UE initiates uplink data transmission in a two-step RACH process according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The embodiment of the invention provides a method for transmitting uplink data, which comprises the following steps:
step 102: sending the UE state indication information to a second access network element; and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.
Here, the UE status indication information may be carried in a message3 (message 3) or a message1 (if a two-step RACH-based access procedure) in a RACH access procedure; the second access network element may be: a serving network element.
The embodiment of the invention can determine the state of the UE before the path switch (path switch) is finished according to the UE state indication information and switch the state of the UE. For example: if the buffered downlink data and uplink data do not exist, the service network element can send a message to indicate that the UE is kept in an inactive state as soon as possible and stops monitoring the downlink control channel, so that the time for the UE to monitor the downlink control channel can be reduced, and the electric energy consumption of the UE is saved.
Wherein the UE status indication information comprises one or more of the following information:
the size of downlink data of the UE buffered by a first access network element (which may be an anchor network element);
whether a first access network element caches downlink data of the UE or not;
RRC state transition indication of the UE;
a part of one RRC message.
In one embodiment, the RRC state transition indication of the UE is: when the UE is instructed to be kept in the inactive state, the UE state indication information further comprises one or more of the following information:
indicating whether the UE needs to keep monitoring the downlink control channel for a period of time;
instructing the UE to keep monitoring the time length information of the downlink control channel;
instructing the UE to start monitoring time offset information of a downlink control channel;
instructing the UE to keep monitoring Discontinuous Reception (DRX) information of the downlink control channel.
In an embodiment, as shown in fig. 1, before the sending the UE status indication information to the second access network element, the method further includes:
step 100: and receiving the information of the UE uplink data buffer sent by the second access network element.
Wherein the information of the UE uplink data buffer comprises one or more of the following information:
the UE carries BSR MAC CE through message1 or message 3;
whether UE has uplink data to be sent;
the size of uplink data to be sent by the UE;
the logical channel of the uplink data that the UE needs to send and the data size of each logical channel.
In an embodiment, as shown in fig. 2, before the sending the UE status indication information to the second access network element, the method further includes:
step 101: and determining the content of the UE state indication information according to whether the buffered downlink data of the UE or the size of the buffered downlink data of the UE exists or not, and/or historical behavior information of the UE, and/or information of an uplink data buffer zone of the UE.
The embodiment of the invention also provides a method for transmitting uplink data, which comprises the following steps:
step 301: receiving UE state indication information sent by a first access network element;
and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.
Here, the first access network element may be: an anchor point network element; the second access network element may be: a serving network element.
The embodiment of the invention can determine the state of the UE before the path switch (path switch) is finished according to the UE state indication information and switch the state of the UE. For example: if the downlink data and the uplink data are not buffered, the service network element can send a message to indicate that the UE is kept in an inactive state as soon as possible and stops monitoring the downlink control channel, so that the time for the UE to monitor the downlink control channel can be reduced, and the electric energy consumption of the UE is saved.
Wherein the UE status indication information comprises one or more of the following information:
the size of downlink data of the UE buffered by a first access network element;
whether a first access network element caches downlink data of the UE or not;
an RRC state transition indication of the UE;
a part of one RRC message.
In an embodiment, as shown in fig. 3, before receiving the UE status indication information sent by the first access network element, the method further includes:
step 300: and sending the information of the UE uplink data buffer to the first access network element.
In one embodiment, if the second access network element determines that the UE is to keep monitoring the downlink control channel subsequently according to the UE status indication information,
after receiving the UE status indication information sent by the first access network element, as shown in fig. 4, the method further includes:
step 302: sending one or more of the following information to the UE:
an indication of whether a downlink control channel needs to be monitored;
UE monitors the time offset of a downlink control channel;
the UE monitors the time length of a downlink control channel;
and the UE monitors DRX configuration information of a downlink control channel.
In an embodiment, after receiving the UE status indication information sent by the first access network element, the method further includes:
and informing the UE of the time information of the UE monitoring the downlink control channel.
The time information of the UE monitoring the downlink control channel is any one of the following information:
a time offset information;
a time offset information and a time length information;
and one DRX configuration message which comprises DRX periods and time period messages for monitoring the downlink control channel in one DRX period.
Therefore, the embodiment of the invention also sends the time information of the UE monitoring the downlink control channel to the UE without waiting for the RRC message responding to the UE to be sent together after the interaction between the service network element and the anchor network element is finished, so that the UE with the failure in contention resolution can restart the RACH process as soon as possible, and the UE with the success in contention resolution monitors the downlink control channel according to the time information of the UE monitoring the downlink control channel, thereby saving the battery consumption of the UE.
The embodiment of the invention also provides a transmission method of uplink data, which comprises the following steps:
and the third access network element sends the time information of the UE monitoring the downlink control channel to the UE.
The time information of the UE monitoring the downlink control channel is any one of the following information:
a time offset information;
a time offset information and a time length information;
a DRX configuration information comprising: DRX period and time period information of monitoring the downlink control channel in one DRX period.
Here, the time information at which the UE listens to the downlink control channel may be carried in message4 (if the four-step RACH-based access procedure) or message 2 (if the two-step RACH-based access procedure) in the RACH access procedure. Of course, it may also be carried in one message after the RACH access procedure.
The embodiment of the invention also provides a transmission method of uplink data, which comprises the following steps:
step 501: and receiving time information of monitoring a downlink control channel by the UE, which is sent by a third access network element.
In an embodiment, as shown in fig. 5, after receiving time information of monitoring a downlink control channel by a UE sent by a third access network element, the method further includes:
step 502: and monitoring the downlink control channel according to the time information of the downlink control channel monitored by the UE.
The embodiment of the present invention further provides a device for transmitting uplink data, which is used to implement the foregoing embodiments, and the description of the foregoing embodiments is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. As shown in fig. 6, the apparatus includes:
a first sending module 602, configured to send the UE status indication information to a second access network element;
and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.
In one embodiment, as shown in fig. 6, the apparatus further comprises:
a first receiving module 600, configured to receive information of a UE uplink data buffer sent by a second access network element before the first sending module sends the UE status indication information to the second access network element.
In one embodiment, as shown in fig. 7, the apparatus further comprises:
a first determining module 601, configured to determine content of the UE status indication information according to whether there is buffered downlink data of the UE or size of the buffered downlink data of the UE, and/or historical behavior information of the UE, and/or information of the UE uplink data buffer.
An embodiment of the present invention further provides a device for transmitting uplink data, where the device includes:
a second receiving module 801, configured to receive UE status indication information sent by a network element of a first access network;
and the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction.
In one embodiment, as shown in fig. 8, the apparatus further comprises:
a second sending module 800, configured to send information of the UE uplink data buffer to the first access network element before the second receiving module receives the UE status indication information sent by the first access network element.
In one embodiment, if the second access network element determines that the UE is to keep monitoring the downlink control channel subsequently according to the UE status indication information,
after the second receiving module 801 receives the UE status indication information sent by the first access network element, the second sending module 800 is further configured to send one or more of the following information to the UE:
an indication of whether a downlink control channel needs to be monitored;
UE monitors the time offset of a downlink control channel;
the UE monitors the time length of a downlink control channel;
and the UE monitors DRX configuration information of a downlink control channel.
In one embodiment, after the second receiving module 801 receives the UE status indication information sent by the first access network element,
the second sending module 800 is further configured to notify the UE of the time information of the UE monitoring the downlink control channel.
An embodiment of the present invention further provides a device for transmitting uplink data, and as shown in fig. 9, the device includes:
a third sending module 901, configured to send the time information of monitoring the downlink control channel by the UE to the UE.
An embodiment of the present invention further provides a device for transmitting uplink data, and as shown in fig. 10, the device includes:
a third receiving module 1001, configured to receive time information of monitoring a downlink control channel by the UE, where the time information is sent by a third access network element.
In one embodiment, as shown in fig. 10, the apparatus further comprises:
the monitoring module 1002 is configured to monitor a downlink control channel according to the time information of the UE monitoring the downlink control channel.
An embodiment of the present invention further provides an access network element, where the access network element includes: fig. 6 and 7 illustrate an uplink data transmission apparatus.
An embodiment of the present invention further provides an access network element, where the access network element includes: fig. 8 illustrates an apparatus for transmitting uplink data.
An embodiment of the present invention further provides an access network element, where the access network element includes: fig. 9 illustrates an apparatus for transmitting uplink data.
An embodiment of the present invention further provides a terminal device, where the terminal device includes: fig. 10 illustrates an apparatus for transmitting uplink data.
The present invention is described below with reference to specific scenario embodiments.
Example 1
Fig. 11 describes a process of initiating uplink data transmission by a UE in an inactive state in a serving network element in the related art, where the serving network element and an anchor network element of the UE are not the same access network element:
the first step is as follows: the UE initiates an access procedure of the RACH in a Cell (e.g., cell a) under the serving network element, and carries the following information in message3 (if the access procedure based on the four-step RACH) or message1 (if the access procedure based on the two-step RACH) in the access procedure of the RACH:
an identity of the UE; a Context identifier (UE Context ID) that can be expressed as a UE, or other identifier that can uniquely identify the UE in the RNA of the access network, or other identifier that can uniquely identify the UE in a cell;
uplink data of the UE.
Optionally, the following components can be carried: authentication information of the UE, such as short MAC-I;
optionally, the following components can be carried: UE initiates cause information (cause) of uplink data transmission;
optionally, the following can also be carried: UE uplink data buffer information (BSR).
The form of the information carried in the message3 or the message1 may include:
an RRC message, such as an RRC connection resume request (RRC connection resume request) message, including the UE identity, the UE authentication information, and the reason information for the UE to initiate uplink data transmission; or, one or more MAC CEs are used to carry the UE identity, UE authentication information, and cause information.
A BSR MAC control element (BSR MAC CE);
uplink data in the MAC PDU is multiplexed in the form of MAC SDUs.
The second step is that: the service network element that receives the message3 or message1 in the first step processes the received information, including:
and identifying the identity of the UE, and determining the anchor network element of the UE through the identity of the UE.
The method comprises the steps that a service network element sends an AS context request message for acquiring UE (user equipment) to an anchor network element through a control plane interface between the service network element and the anchor network element, for example, a Retrieve UE context request message, and the message at least carries the following information: and identifying the UE.
Optionally, the message may also carry authentication information of the UE and information of a Cell where the UE currently initiates the RACH procedure (for example, PCI: physical Cell ID).
The third step: the processing, by the anchor network element of the UE, the UE context request message includes:
the Anchor network element determines AS context information of the UE, including access network (AS) context (context) of the UE, and authenticates and checks the identity authenticity of the UE according to the AS context information of the UE and the UE authentication information to which the AS context information belongs.
And if the identity of the UE passes the check, the anchor network element of the UE responds to the service network element to acquire an AS Context Response message of the UE, such AS a Retrieve UE Context Response message, and the message carries the Context information of the UE.
The AS context information of the UE includes but is not limited to: security context of AS layer, ERAB context information of UE, RRC context (including PDCP, RLC protocol configuration information).
After receiving the context information of the UE, the serving network element establishes corresponding radio access network user plane entities including PDCP entities, RLC entities and the like for the SRB and DRB of the UE.
The fourth step: the service network element sends a message to the UE;
wherein, the message carries RRC message, such as RRC Resume message; the RRC message indicates state transition information (state indication) of the UE, for example: instructing the UE to transition to an RRC connected state, or instructing the UE to remain in an inactive state (inactive state), or instructing the UE to transition to an RRC idle state (idle); and the RRC message contains information and configuration necessary for the UE to make a state transition.
Optionally, the message sent to the UE may also indicate the state transition information of the UE in the form of a MAC CE.
It should be noted that the RRC message or the MAC CE is not necessarily sent to the UE in the message4 (based on the four-step RACH procedure) or the message 2 (based on the two-step RACH procedure) in the RACH procedure.
The fifth step: migrating the connection of the UE and the core network to a serving network element, comprising:
the serving network element initiates a control plane procedure, such as a path switch procedure, to the core network, and migrates the connection between the UE held in the anchor network element and the core network to the serving network element. The path switch procedure also transfers the downlink data buffered by the anchor network element for the UE to the serving network element.
With respect to the above method flow, the present embodiment provides the following method to improve the above process.
In the third step of the above process, the anchor network element further indicates a serving network element UE status indication information, where the UE status indication information includes one or more of the following information:
the size of downlink data of the UE buffered by the anchor network element; the downlink data size of the UE is the size of the downlink data of each DRB, i.e. a list of (DRBs, downlink data size), or the sum of the sizes of all DRBs;
whether an anchor network element caches downlink data of the UE or not; optionally, whether there is downlink data may be indicated according to each DRB, that is, a list of (DRBs, whether there is downlink data);
an RRC state transition indication of the UE; the method comprises the following steps: indicating to convert the UE into a connected state (or called active state), or indicating to convert the UE into an idle state (idle), or indicating to keep the UE in an inactive state;
optionally, if the UE is instructed to remain in the inactive state, the UE status indication information further includes one or more of the following information:
indicating whether the UE needs to keep monitoring a downlink control channel (PDCCH) for a period of time to receive downlink data buffered at an access network;
instructing the UE to keep monitoring the time length information of the downlink control channel;
instructing the UE to start monitoring time offset information of a downlink control channel;
indicating the UE to keep monitoring the DRX (discontinuous Reception) information of the downlink control channel; the DRX information comprises the size of a DRX period and the position information of monitoring downlink data transmission signaling in the DRX period.
A portion of an RRC message, the contents of which may include: the RRC message may include an RRC message to transition the UE state from an inactive state to an RRC connected state, an RRC message to transition the UE state from an inactive state to an RRC idle state, and an RRC message to maintain the UE state in an inactive state. The serving network element forwards the RRC message to the UE.
Optionally, in the second step, the serving network element further sends information of an uplink data buffer to the anchor network element UE; the information of the UE uplink data buffer includes: the UE determines whether uplink data needs to be sent or not through the BSR MAC CE carried in the message1 or the message3, and/or whether the UE has the size of the uplink data which needs to be sent, and/or the logical channels of the uplink data which needs to be sent by the UE and the data size of each logical channel.
Optionally, the anchor network element determines, according to whether there is buffered downlink data of the UE or the size of the buffered downlink data of the UE, and/or historical behavior information of the UE, and/or information of a UE uplink data buffer, content of the UE status indication information sent to the serving network element in the third step.
Wherein the historical behavior information of the UE is as follows: the previous behavior of the UE recorded by the anchor network element refers to a service model (service model) of uplink and downlink data of the UE, that is, information about a time interval and a size of the uplink and downlink data of the UE in a past period.
Here, since the anchor network element maintains the connection established for the UE with the core network, if the core network has data to send to the access network, the anchor network element knows the buffering condition of the downlink data of the UE (the size of the buffered downlink data).
In the fourth step, the serving network element determines the RRC state of the subsequent UE according to the UE state indication information provided by the anchor network element in the third step, and if the UE is kept in the inactive state, the serving network element needs to keep monitoring the downlink control channel for the UE.
If the UE is required to keep monitoring the downlink control channel, the serving network element further sends to the UE one or more combinations of the following information:
an indication of whether a downlink control channel needs to be monitored;
UE monitors the time offset of a downlink control channel;
the UE monitors the time length of a downlink control channel;
and the UE monitors DRX configuration information of a downlink control channel.
The RNTI used by the UE for continuously monitoring the downlink control channel is a temporary RNTI allocated by the UE in the RACH process.
It can be seen that when the serving network element determines the subsequent RRC state of the UE and the behavior of the UE remaining in the inactive state, more complete information is needed to complete the determination. The information of the downlink data buffer (such as the size of the downlink data of the UE buffered by the anchor network element described above) and the historical behavior information of the UE are important factors that affect whether the UE needs to enter the connected state, and the transfer of these information is missing in the above related art.
Although the serving network element may obtain the buffered downlink data size information of the UE after the path switch is completed, the path switch process needs a certain time to complete, and if the UE is unnecessarily switched to the RRC connected state before the path switch process is completed because the information transmitted to the serving network element by the anchor network element is lacked, or the UE keeps monitoring the downlink control channel, the UE battery is wasted.
Therefore, with the method provided in this embodiment, the serving network element can quickly obtain the above information maintained in the anchor network element, i.e. in the third step in this embodiment, so that the state of the UE can be properly determined and converted before the path switch is completed. For example: if the buffered downlink data and uplink data do not exist, the service network element can send a message to indicate that the UE is kept in an inactive state as soon as possible and stops monitoring the downlink control channel, so that the time for the UE to monitor the downlink control channel can be reduced, and the electric energy consumption of the UE is saved.
Example 2
Fig. 12 is a schematic diagram of a four-step RACH procedure in the related art, fig. 13 is a schematic diagram of a two-step RACH procedure in the related art, and the four-step RACH procedure is taken as an example to illustrate a procedure of transmitting uplink data by a UE in an inactive state:
the first step is as follows: the UE sends a message1, and the method comprises the following steps:
and the UE randomly selects a preamble from the random access channel resources configured by the cell and sends the preamble on the random access channel.
The second step: the access network element receives the message1 sent by the UE and responds to the message 2;
the Message 2 is also called RAR Message (Random Access Response), and the RAR Message carries Response information of preamble sent by the UE, including uplink grant (UL grant) of resource sending the Message3, a temporary RNTI (temp C-RNTI), and information (timing advance command) of uplink timing adjustment.
The third step: the UE sends a message 3;
if the UE receives RAR response information aiming at the preamble sent by the UE in the message1, the UE adjusts the timing offset for sending the uplink signal according to the timing adjustment information and sends the message3 in the uplink authorized resource.
The content of the message3 comprises:
an identity of the UE; it is shown as a UE Context ID, or other identifier that uniquely identifies the UE in the access network's RNA, or other identifier that uniquely identifies the UE in a cell.
And, uplink data of the UE.
Optionally, the content of the message3 further includes: authentication information of the UE, such as short MAC-I.
Optionally, the content of the message3 further includes: and the UE initiates cause information (cause) of uplink data transmission.
Optionally, the content of the message3 further includes: UE uplink data buffer information (BSR).
The fourth step: the network element of the access network responds to the message 4;
here, for the received message3, the network side schedules channel resources for transmitting the message4 through the PDCCH signaling scrambled by the temp C-RNTI, and the UE receives the message4 by detecting the temp C-RNTI received in the message 2 to obtain scheduling information of the message 4.
The Message4 includes a contention resolution MAC CE, where the MAC CE includes an identifier for contention resolution of the UE, and the UE that receives the Message4 checks whether the UE contention resolution identifier is a contention resolution identifier of the UE, if so, the RACH procedure of the UE is successfully ended, otherwise, the contention resolution of the RACH procedure is failed.
In the related art, the message4 will also carry an RRC message to update the AS configuration of the UE, indicate the subsequent RRC state of the UE, and provide authentication information of the network element of the access network.
Regarding the flow shown in fig. 13, similar to the flow shown in fig. 12, in the first step of fig. 13, the information in the message1 sent by the UE to the network element of the access network is the superposition of the information in the message1 and the message3 in fig. 12; the information in the message 2 sent by the network element of the access network to the UE in the second step of fig. 13 is similar to the information in the message4 in fig. 12, and will not be described in detail here.
As can be seen from the above description, if the serving network element of the cell where the UE initiates the uplink data transmission is different from the anchor network element of the UE, as described in embodiment 1, a series of interactions are required between the serving network element and the anchor network element of the UE to determine the subsequent RRC state and behavior of the UE. On the other hand, the UE needs to confirm that the serving network element is not a fake access network element, and therefore needs to authenticate the access network element, that is, to provide access network element authentication information, and a key for generating the access network element authentication information also needs to be transferred from the anchor network element to the serving network element.
Considering that there is a delay in the interaction between the serving network element and the anchor network element, for example, in the related art, the one-way communication delay between the serving network element and the anchor network element may be up to 100 milliseconds (ms), and the delay of the round-trip operation may be up to several hundred milliseconds at most.
If the interaction process between the serving network element and the anchor network element is finished before the message4 can be sent, the UE needs to keep monitoring the downlink control channel for the maximum time of several hundred milliseconds, which consumes the battery of the UE unnecessarily.
More disadvantageously, the UE cannot determine whether its RACH procedure is successful or contention resolution fails during this period. Therefore, if the UE fails to perform contention resolution in the RACH procedure this time (the access network does not successfully decode the message3 sent by the UE), the UE cannot continue to initiate a new RACH procedure, thereby increasing the delay of sending uplink data by the UE.
In view of the above problem, the present embodiment provides the following method (as shown in fig. 11 and fig. 14, the following description takes a four-step RACH procedure as an example):
the access network element receiving the message3 sends a contention Resolution MAC CE (UE contention Resolution MAC CE) through the message4, and carries time information of the UE monitoring the downlink control channel in the message 4.
And if the UE receiving the message4 determines that the contention resolution identifier carried by the message4 is the contention resolution identifier of the UE, the UE monitors the downlink control channel according to the time information for monitoring the downlink control channel.
The time information of the UE listening to the downlink control channel indicated in the message4 may include one of the following manners:
a time offset information; that is, the UE monitors the downlink control channel from the time when the information is received plus the time offset;
a time offset information and a time length information; namely: and the UE monitors the downlink control channel within the time of the time length from the time of receiving the information plus the time offset. When the time offset information is missing, the time offset value is 0;
one DRX configuration information including a DRX cycle and period information (time offset, and/or time length) of monitoring the downlink control channel during one DRX cycle. And the UE monitors the downlink control channel in the time period which is indicated by each DRX configuration information and monitors the downlink control channel. The DRX configuration information may further include time range information in which the DRX is valid, or valid DRX repetition number information.
And the service network element dispatches and sends the RRC message or the MAC CE carrying the subsequent RRC state transition indicating the UE and the authentication information of the access network element after the message 4.
For example, according to the method in embodiment 1, after receiving the response message for acquiring the uplink of the UE sent by the anchor network element of the UE, the serving network element sends the RRC message or the MAC CE.
Because the delay between the serving network element and the anchor network element is relatively determined, the serving network element can know the delay according to the communication history between the serving network element and the anchor network element, so that the serving network element can properly set the time for the UE to monitor the downlink control channel in the message 4.
Fig. 15 illustrates how the method provided by the present embodiment is implemented in a two-step RACH-based procedure. The following is briefly described:
the access network element receiving the message1 sends a contention Resolution MAC CE (UE contention Resolution MAC CE) through the message 2, and carries time information of the UE monitoring the downlink control channel in the message 2. The content of the time information of the UE monitoring the downlink control channel is the same as that described above and is not described again.
And if the UE receiving the message 2 determines that the competition resolving identifier carried by the message 2 is the competition resolving identifier of the UE, the UE monitors the downlink control channel according to the time information for monitoring the downlink control channel.
It can be seen that, in the present embodiment, the reply message (for example, RRC resume) that replies to the RRC message (for example, RRC resume request) sent by the UE is essentially unbound to the message4 (message 2). Under the above scenario, the serving network element may send a message4 (message 2) indicating the UE to contend for the resolution identifier within the shortest time, without waiting for the RRC message of the UE to be sent together with the RRC message of the response UE after the interaction between the serving network element and the anchor network element is finished; therefore, the UE that fails in contention resolution can re-initiate the RACH procedure as soon as possible, and the UE that succeeds in contention resolution starts monitoring the downlink control channel within a suitable time window according to the method provided in this embodiment, that is, the time information for monitoring the downlink control channel indicated in the message4 (message 2), thereby saving battery consumption of the UE.
Of course, the method of this embodiment is also applicable to indicating, in any downlink MAC CE sent to the UE, the time for the UE to monitor the downlink control channel after receiving the MAC CE, in the process of sending downlink data in the inactive state.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program 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 computer program instructions may also be stored in a computer-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 computer-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 computer program 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.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (24)

1. A method for transmitting uplink data, the method comprising:
sending the state indication information of the user equipment UE to a second access network element;
the second access network element is a network element for initiating RACH access by the UE, and the UE state indication information is used for the second access network element to determine the connection state of the UE in subsequent interaction;
the UE state indication information comprises a part of an RRC message;
the content of the RRC message comprises: RRC message to maintain the UE state in an inactive state;
and the second access network element forwards the RRC message to the UE.
2. The method of claim 1, wherein before the sending the UE status indication information to the second access network element, the method further comprises:
and receiving the information of the UE uplink data buffer area sent by the second access network element.
3. The method of claim 2, wherein the information of the UE uplink data buffer comprises one or more of the following information:
the UE reports a physical address control unit (BSR MAC CE) through a buffer state carried by a message1 or a message 3;
whether UE has uplink data to be sent;
the size of uplink data to be sent by the UE;
a logical channel of uplink data that the UE needs to transmit and a data size of each logical channel.
4. The method of claim 2, wherein before the sending the UE status indication information to the second access network element, the method further comprises:
and determining the content of the UE state indication information according to whether the buffered downlink data of the UE or the size of the buffered downlink data of the UE exists or not, and/or historical behavior information of the UE, and/or information of an uplink data buffer zone of the UE.
5. A method for transmitting uplink data, the method comprising:
receiving User Equipment (UE) state indication information sent by a first access network element;
the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction; the second access network element refers to a network element for initiating RACH access by the UE;
the UE status indication information comprises a part of an RRC message;
the content of the RRC message comprises: an RRC message to maintain the UE state in an inactive state;
and the second access network element forwards the RRC message to the UE.
6. The method of claim 5, wherein before receiving the UE status indication information sent by the first access network element, the method further comprises:
and sending the information of the UE uplink data buffer to the first access network element.
7. The method of claim 5, wherein after receiving the UE status indication information sent by the first access network element, the method further comprises:
and informing the UE of the time information of the UE monitoring the downlink control channel.
8. The method according to claim 7, wherein the time information when the UE listens to the downlink control channel is any one of the following information:
time offset information;
time offset information and time length information;
DRX configuration information, including: DRX period and time period information of monitoring the downlink control channel in one DRX period.
9. A method for transmitting uplink data, the method comprising:
the third access network element sends the time information of monitoring the downlink control channel by the user equipment UE to the UE; the time information of the UE monitoring the downlink control channel can be carried in a message4 or a message 2 in the RACH access process; the message4 or the message 2 comprises an identifier for UE contention resolution; the message4 or the message 2 does not carry RRC message;
the time information of the UE monitoring the downlink control channel is any one of the following information:
time offset information;
time offset information and time length information;
DRX configuration information, including: DRX period and monitoring the time period information of the downlink control channel in one DRX period.
10. A method for transmitting uplink data, the method comprising:
receiving time information of a user equipment UE monitoring downlink control channel sent by a third access network element; the time information of the UE monitoring the downlink control channel can be carried in a message4 or a message 2 in the RACH access process; the message4 or the message 2 comprises an identifier for UE contention resolution; the message4 or the message 2 does not carry RRC message;
the time information of the UE monitoring the downlink control channel is any one of the following information:
time offset information;
time offset information and time length information;
DRX configuration information, including: DRX period and time period information of monitoring the downlink control channel in one DRX period.
11. The method of claim 10, wherein after receiving the time information for the UE to listen to the downlink control channel sent by the third network element, the method further comprises:
and monitoring the downlink control channel according to the time information of the downlink control channel monitored by the UE.
12. An apparatus for transmitting uplink data, the apparatus comprising:
the first sending module is used for sending the UE state indication information to a second access network element;
the UE is in an inactive state, the second access network element refers to a network element for initiating RACH access by the UE, and the UE state indication information is used for the second access network element to determine the connection state of the UE in subsequent interaction;
the UE state indication information comprises a part of an RRC message;
the content of the RRC message comprises: RRC message to maintain the UE state in an inactive state;
and the second access network element forwards the RRC message to the UE.
13. The apparatus of claim 12, further comprising:
a first receiving module, configured to receive information of a UE uplink data buffer sent by a second access network element before the first sending module sends the UE status indication information to the second access network element.
14. The apparatus of claim 13, further comprising:
a first determining module, configured to determine content of the UE status indication information according to whether there is buffered downlink data of the UE or size of the buffered downlink data of the UE, and/or historical behavior information of the UE, and/or information of the UE uplink data buffer.
15. An apparatus for transmitting uplink data, the apparatus comprising:
a second receiving module, configured to receive user equipment UE status indication information sent by a first access network element;
the UE state indication information is used for the second access network element to determine the connection state of the UE in the subsequent interaction; the second access network element refers to a network element for initiating RACH access by the UE;
the UE state indication information comprises a part of an RRC message;
the content of the RRC message comprises: RRC message to maintain the UE state in an inactive state;
and the second access network element forwards the RRC message to the UE.
16. The apparatus of claim 15, further comprising:
and a second sending module, configured to send the information of the UE uplink data buffer to the first access network element before the second receiving module receives the UE status indication information sent by the first access network element.
17. The apparatus of claim 15, wherein after the second receiving module receives the UE status indication information sent by the first access network element,
and the second sending module is further configured to notify the UE of the time information of monitoring the downlink control channel by the UE.
18. An apparatus for transmitting uplink data, the apparatus comprising:
a third sending module, configured to send time information for a UE to monitor a downlink control channel to the UE; the time information of the UE monitoring the downlink control channel can be carried in a message4 or a message 2 in the RACH access process; the message4 or the message 2 comprises an identifier for UE contention resolution; the message4 or the message 2 does not carry RRC message;
the time information of the UE monitoring the downlink control channel is any one of the following information:
time offset information;
time offset information and time length information;
DRX configuration information, including: DRX period and time period information of monitoring the downlink control channel in one DRX period.
19. An apparatus for transmitting uplink data, the apparatus comprising:
a third receiving module, configured to receive time information of a downlink control channel monitored by the UE and sent by a third access network element; the time information of the UE monitoring the downlink control channel can be carried in a message4 or a message 2 in the RACH access process; the message4 or the message 2 comprises an identifier for UE contention resolution; the message4 or the message 2 does not carry RRC message;
the time information of the UE monitoring the downlink control channel is any one of the following information:
time offset information;
time offset information and time length information;
DRX configuration information, including: DRX period and time period information of monitoring the downlink control channel in one DRX period.
20. The apparatus of claim 19, further comprising:
and the monitoring module is used for monitoring the downlink control channel according to the time information of the UE monitoring the downlink control channel.
21. An access network element, comprising: the apparatus for transmitting upstream data according to any one of claims 12 to 14.
22. An access network element, comprising: the apparatus for transmitting upstream data according to any one of claims 15 to 17.
23. An access network element, comprising: the apparatus for transmitting uplink data according to claim 18.
24. A terminal device, characterized in that the terminal device comprises: the apparatus for transmitting uplink data according to claim 19.
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