CN106961703B - Information transmission method, device and system - Google Patents

Information transmission method, device and system Download PDF

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Publication number
CN106961703B
CN106961703B CN201610017670.3A CN201610017670A CN106961703B CN 106961703 B CN106961703 B CN 106961703B CN 201610017670 A CN201610017670 A CN 201610017670A CN 106961703 B CN106961703 B CN 106961703B
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base station
mme
capability
iot
information
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CN106961703A (en
Inventor
沙秀斌
高音
余媛芳
戴谦
戴博
艾建勋
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ZTE Corp
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ZTE Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission and use of information for re-establishing the radio link
    • H04W36/0058Transmission of hand-off measurement information, e.g. measurement reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data session or connection
    • H04W36/0033Control or signalling for completing the hand-off for data session or connection with transfer of context information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/02Access restriction performed under specific conditions
    • H04W48/06Access restriction performed under specific conditions based on traffic conditions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/20Manipulation of established connections
    • H04W76/27Transitions between radio resource control [RRC] states

Abstract

The invention discloses an information transmission method, device and system. The information transmission method comprises the following steps: the method comprises the steps that a first base station acquires the narrow-band Internet of things (NB-IoT) supporting capability of User Equipment (UE) by establishing Radio Resource Control (RRC) connection with the UE; the first base station sends the NB-IoT support capability of the UE to the first MME to indicate the first MME to store the NB-IoT support capability of the UE and indicate the first MME to send the NB-IoT support capability of the UE to a base station which is currently accessed by the UE when the UE requests to reestablish RRC connection or the base station which is accessed by the UE is changed, wherein the base station which is currently accessed by the UE is under the first MME. The invention improves the practicability of the wireless connection service in NB-IoT by designing and transmitting the narrow-band access capability of UE and the mode of the support capability based on the user plane and the control plane transmission optimization scheme.

Description

Information transmission method, device and system
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to an information transmission method, apparatus, and system.
Background
With the development of wireless communication technology, the demand for traffic, the number of terminals and the types of terminals in mobile network applications have all shown explosive growth trend, and the fifth Generation mobile communication technology (5th Generation, abbreviated as: 5G) has become a trend of network development in the future. Machine to Machine (M2M) Communication (MTC) is one of important scenes and technical means of 5G system, and will become an important application field of future wireless Communication.
In the research of MTC technology, a research topic of narrowband Internet of Things (NB-IoT) is proposed for low-cost and low-throughput type terminal devices, that is, a low-throughput wireless communication service is provided for NB-IoT low-cost terminal devices (UE) in a 200 kilohertz (kHz) frequency band. The NB-IoT introduces different uplink narrowband access capabilities and optimized data transmission schemes aiming at the characteristics of low cost and small data volume transmission of the UE, wherein the optimized data transmission schemes comprise optimization schemes based on user plane and control plane transmission. In the current standard state, the base station does not acquire the narrowband access capability of the UE and the standard scheme of the support capability based on the user plane and the control plane transmission optimization scheme, and various capabilities of the UE play a crucial role in the application of the wireless connection of the MTC system, so how to transfer the narrowband access capability of the UE in the MTC and the support capability based on the user plane and the control plane transmission optimization scheme become problems that need to be solved at present.
Disclosure of Invention
In order to solve the technical problem, the invention provides an information transmission method, device and system, which improve the practicability of wireless connection service in NB-IoT by designing and transmitting the narrow-band access capability of UE and the support capability based on the user plane and control plane transmission optimization scheme.
In a first aspect, the present invention provides an information transmission method, including:
the method comprises the steps that a first base station acquires the NB-IoT supporting capability of the UE through establishing Radio Resource Control (RRC) connection with the UE, wherein the NB-IoT supporting capability of the UE comprises one or more of uplink narrow-band access capability of the UE and supporting capability based on a user plane and control plane transmission optimization scheme;
the first base station sends NB-IoT support capability of the UE to a first Mobility Management Entity (MME) to indicate the first MME to store the NB-IoT support capability of the UE and indicate the first MME to send the NB-IoT support capability of the UE to a base station which is currently accessed by the UE when the UE requests to reestablish RRC connection or the base station which is accessed by the UE is changed, wherein the base station which is currently accessed by the UE is under the first MME.
In a first possible implementation manner of the first aspect, the obtaining, by the first base station through a radio resource control RRC connection with a user equipment UE, a narrowband internet of things NB-IoT supporting capability of the UE includes:
when the UE is initially attached, or the NB-IoT support capability of the UE is changed, or the first base station allocates wireless resources for the UE, and the first base station does not acquire the NB-IoT support capability of the UE, the first base station sends a UE capability query message to the UE;
the first base station receives a UE capability information indication message sent by the UE, wherein the UE capability information indication message comprises NB-IoT supporting capability of the UE.
In a second possible implementation manner of the first aspect, when the UE requests to reestablish the RRC connection, or when the UE is handed over from a second base station under the first MME to the first base station, the method further includes:
the first base station acquires NB-IoT support capability of the UE from the first MME by reestablishing RRC connection with the UE;
the acquiring, by the first base station, an NB-IoT support capability of the UE in the first MME includes:
the first base station sends an initial UE message to the first MME, wherein the initial UE message comprises service request information;
the first base station receives an initial context setup request message sent by the first MME, wherein the initial context setup request message comprises NB-IoT supporting capability of the UE.
In a third possible implementation manner of the first aspect, when the UE is handed over from a third base station under a second MME to the first base station, the method further includes:
the first base station receives a handover command sent by the first MME, wherein the handover command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, the handover command comprises NB-IoT support capability of the UE and a target address of handover, and the target address is the first base station under the first MME;
the first base station demodulates the switching command and acquires NB-IoT support capability of the UE in the switching command;
the first base station sends the NB-IoT support capability of the UE to the first MME to instruct the first MME to store the NB-IoT support capability of the UE.
In a fourth possible implementation manner of the first aspect, the method further includes:
the first base station receives measurement information sent by the UE, and the measurement information indicates the target base station switched by the UE to the first base station as a fourth base station;
the first base station indicates the fourth base station to acquire a handover request message including the NB-IoT support capability of the UE through the measurement information, and the handover request message is used for indicating the second base station to allocate wireless resources for the UE according to the NB-IoT support capability of the UE.
According to a fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the first base station and the fourth base station are both under the first MME, and the first base station and the fourth base station are connected through an X2 interface; the first base station instructs the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE through the measurement information, including:
the first base station sends the handover request message including NB-IoT support capabilities of the UE to the fourth base station over the X2 interface.
According to a fourth possible implementation manner of the first aspect, in a sixth possible implementation manner, an X2 interface is not provided between the first base station and the fourth base station; the first base station instructs the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE through the measurement information, including:
the first base station sends the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to the fourth base station, where the first base station and the fourth base station are both under the first MME; alternatively, the first and second electrodes may be,
the first base station sends the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to a second MME, so that the second MME forwards the handover request message to a fourth base station, where the fourth base station is under the second MME.
In a seventh possible implementation manner of the first aspect, the first base station acquires context information of the UE by establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an access stratum AS security context; the method further comprises the following steps:
the first base station determining to suspend the established RRC connection;
the first base station sends the context information of the UE to the first MME, and the context information of the UE is used for indicating the first MME to send the context information of the UE to a base station accessed by the UE when the UE initiates an optimization scheme based on user plane transmission;
the first base station suspends the RRC connection established with the UE.
According to a seventh possible implementation manner of the first aspect, in an eighth possible implementation manner, after the first base station suspends the RRC connection established with the UE, the method further includes:
the first base station receives an RRC connection recovery request message sent by the UE;
if the context information of the UE is stored in the first base station, sending an RRC connection recovery completion message to the UE;
and if the context information of the UE is not stored in the first base station, sending a UE context request message to the first MME, and receiving a UE context response message returned by the first MME, thereby sending an RRC connection recovery completion message to the UE.
According to a third possible implementation manner of the first aspect, in a ninth possible implementation manner, the NB-IoT supporting capability of the UE sent by the first base station to the first MME further carries an NB-IoT supporting capability of each cell under the first base station, where the NB-IoT supporting capability of each cell under the first base station includes an uplink narrowband access capability of each cell under the first base station and a supporting capability based on a user plane and a control plane transmission optimization scheme;
the handover command further includes NB-IoT support capability of each cell under the third base station, and the NB-IoT support capability of each cell under the third base station includes uplink narrowband access capability of each cell under the third base station and support capability based on a user plane and a control plane transmission optimization scheme.
In a tenth possible implementation manner of the first aspect, the first base station and the fifth base station are connected through an X2 interface, and the method further includes:
the first base station sends NB-IoT supporting capability of each cell under the first base station to the fifth base station through the X2 interface, wherein the NB-IoT supporting capability of each cell under the first base station comprises uplink narrowband access capability of each cell under the first base station and supporting capability based on a user plane and control plane transmission optimization scheme;
the first base station receives NB-IoT supporting capability of each cell under the fifth base station, which is sent by the fifth base station through the X2 interface, and the NB-IoT supporting capability of each cell under the fifth base station comprises uplink narrowband access capability of each cell under the fifth base station and supporting capability based on a user plane and control plane transmission optimization scheme.
In an eleventh possible implementation manner of the first aspect, the method further includes:
the first base station receives uplink narrow band access capability of the UE sent by the UE through a Physical Random Access Channel (PRACH);
and the first base station determines that the uplink narrowband access capability of the UE is single-frequency access or multi-frequency access according to the type of the PRACH.
In a second aspect, the present invention provides an information transmission method, including:
a first Mobility Management Entity (MME) receives NB-IoT supporting capability of User Equipment (UE) sent by a first base station, wherein the NB-IoT supporting capability of the UE is acquired by the first base station through establishing Radio Resource Control (RRC) connection with the UE, and the NB-IoT supporting capability of the UE comprises one or more of uplink narrow-band access capability of the UE and supporting capability based on a user plane and control plane transmission optimization scheme;
the first MME stores NB-IoT support capabilities of the UE;
the first MME sends the NB-IoT support capability of the UE to a second base station when the UE requests to establish RRC connection through the second base station or the UE is switched from the first base station to the second base station under the first MME.
In a first possible implementation manner of the second aspect, when the UE requests to establish an RRC connection through a second base station or the UE is handed over from the first base station to a second base station under the first MME, the sending, by the first MME, an NB-IoT support capability of the UE to the second base station includes:
the first MME receives an initial UE message sent by the second base station, wherein the initial UE message comprises service request information;
the first MME sends an initial context setup request message to the second base station, wherein the initial context setup request message comprises NB-IoT supporting capability of the UE.
In a second possible implementation manner of the second aspect, when the UE is handed over from a third base station under the second MME to the first base station, the method further includes:
the first MME sends a switching command to the first base station, wherein the switching command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, the switching command comprises NB-IoT supporting capability of the UE and a switching target address, and the target address is the first base station under the first MME;
and the first MME receives and stores the NB-IoT supporting capability of the UE sent by the first base station, wherein the NB-IoT supporting capability of the UE is acquired by the first base station through demodulating the switching command.
In a third possible implementation manner of the second aspect, when the first base station allocates a radio resource for the UE, the method further includes:
the first MME sends an initial context setup request message to the first base station, and the initial context setup request message does not include NB-IoT support capability of the UE;
the first MME receives and stores the NB-IoT supporting capability of the UE sent by the first base station, the NB-IoT supporting capability of the UE is obtained by the first base station through sending a UE capability query message to the UE, and the NB-IoT supporting capability of the UE is used for the first base station to allocate wireless resources for the UE.
In a fourth possible implementation manner of the second aspect, the method further includes:
the first MME receives a switching request sent by the first base station, the switching request is sent to the first MME after the first base station receives measurement information sent by the UE, and the measurement information is used for indicating that a target base station switched by the UE is a fourth base station;
the first MME forwards the switching request message to the fourth base station, wherein the first base station and the fourth base station are both under the first MME; alternatively, the first and second electrodes may be,
the first MME sends the switching request to a second MME, and the switching request is used for indicating the second MME to forward the switching request message to a fourth base station, wherein the fourth base station is under the second MME.
In a fifth possible implementation manner of the second aspect, the first base station acquires context information of the UE by establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an access stratum AS security context; the method further comprises the following steps:
the first MME receives context information of UE sent by the first base station, wherein the context information of the UE is sent to the first MME before the first base station suspends the established RRC connection;
and the first MME sends the context information of the UE to a base station accessed by the UE when the UE initiates an optimization scheme based on user plane transmission.
According to a fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, after the first MME receives context information of the UE sent by the first base station, the method further includes:
the first MME receives a UE context request message sent by the first base station, wherein the UE context request message is sent to the first MME when the first base station receives an RRC connection recovery request message sent by the UE and the context information of the UE is not stored in the first base station;
the first MME sends a UE context response message to the first base station, wherein the UE context response message is used for indicating the first base station to send an RRC connection recovery completion message to the UE.
In a third aspect, the present invention provides an information transmission apparatus provided in a first base station, the information transmission apparatus including: the device comprises a receiving module and a sending module;
the receiving module and the sending module are configured to acquire a narrowband internet of things (NB-IoT) support capability of a User Equipment (UE) by establishing a Radio Resource Control (RRC) connection with the UE, where the NB-IoT support capability of the UE includes one or more of an uplink narrowband access capability of the UE and a support capability based on a user plane and a control plane transmission optimization scheme;
the sending module is further configured to send the NB-IoT support capability of the UE to a first mobility management entity MME to indicate that the first MME stores the NB-IoT support capability of the UE, and indicate that the first MME sends the NB-IoT support capability of the UE to a base station to which the UE is currently accessed when the UE requests to reestablish RRC connection or a base station to which the UE is accessed is changed, where the base station to which the UE is currently accessed is under the first MME.
In a first possible implementation manner of the third aspect, the receiving module and the sending module are configured to obtain a narrowband internet of things NB-IoT supporting capability of a user equipment UE through a radio resource control RRC connection with the UE, and include:
when the UE is initially attached, or the NB-IoT support capability of the UE is changed, or the first base station allocates wireless resources to the UE, and the first base station does not acquire the NB-IoT support capability of the UE, the sending module is further configured to send a UE capability query message to the UE;
the receiving module is further configured to receive a UE capability information indication message sent by the UE, where the UE capability information indication message includes NB-IoT support capability of the UE.
In a second possible implementation manner of the third aspect, when the UE requests to reestablish the RRC connection, or when the UE is handed over from a second base station under the first MME to the first base station;
the receiving module and the sending module are further configured to acquire an NB-IoT support capability of the UE from the first MME by reestablishing an RRC connection with the UE;
the receiving module and the sending module are configured to acquire an NB-IoT support capability of a UE, and include:
the sending module is further configured to send an initial UE message to the first MME, where the initial UE message includes service request information;
the receiving module is further configured to receive an initial context setup request message sent by the first MME, where the initial context setup request message includes an NB-IoT support capability of the UE.
In a third possible implementation manner of the third aspect, when the UE is handed over from a third base station under a second MME to the first base station;
the receiving module is further configured to receive a handover command sent by the first MME, where the handover command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, where the handover command includes an NB-IoT support capability of the UE and a target address of handover, and the target address is a first base station under the first MME;
the information transmission apparatus further includes: a demodulation module, configured to demodulate the handover command and obtain NB-IoT support capability of the UE in the handover command;
the sending module is further configured to send the NB-IoT support capability of the UE to the first MME to instruct the first MME to store the NB-IoT support capability of the UE.
In a fourth possible implementation manner of the third aspect, the receiving module is further configured to receive measurement information sent by the UE, where the measurement information indicates, to the first base station, that a target base station to which the UE is handed over is a fourth base station;
the sending module is further configured to instruct, through the measurement information, the fourth base station to obtain a handover request message including an NB-IoT support capability of the UE, where the handover request message is used to instruct the second base station to allocate radio resources to the UE according to the NB-IoT support capability of the UE.
According to a fourth possible implementation manner of the third aspect, in a fifth possible implementation manner, the first base station and the fourth base station are both under the first MME, and the first base station and the fourth base station are connected through an X2 interface;
the sending module is configured to instruct, through the measurement information, the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE, where the handover request message includes: sending the handover request message including NB-IoT support capabilities of the UE to the fourth base station over the X2 interface.
According to a fourth possible implementation manner of the third aspect, in a sixth possible implementation manner, an X2 interface is not provided between the first base station and the fourth base station;
the sending module is configured to instruct, through the measurement information, the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE, where the handover request message includes: sending the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to the fourth base station, where the first base station and the fourth base station are both under the first MME; or sending the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to a second MME, so that the second MME forwards the handover request message to a fourth base station, where the fourth base station is under the second MME.
In a seventh possible implementation manner of the third aspect, the first base station acquires context information of the UE by establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an access stratum AS security context; the information transmission apparatus further includes: a determining module and a suspending module;
the determining module is configured to determine to suspend the established RRC connection;
the sending module is further configured to send context information of the UE to the first MME, where the context information of the UE is used to instruct the first MME to send the context information of the UE to a base station to which the UE accesses when the UE initiates an optimization scheme based on user plane transmission;
the suspending module is configured to suspend the RRC connection established with the UE.
According to a seventh possible implementation manner of the third aspect, in an eighth possible implementation manner, the receiving module is further configured to receive an RRC connection resumption request message sent by the UE after the suspending module suspends the RRC connection established with the UE; the information transmission apparatus further includes:
a judging module, configured to judge whether the context information of the UE is stored in the first base station;
the sending module is further configured to send an RRC connection recovery complete message to the UE when the determining module determines that the context information of the UE is stored in the first base station;
the sending module is further configured to send a UE context request message to the first MME when the determining module determines that the context information of the UE is not stored in the first base station;
the receiving module is further configured to receive a UE context response message returned by the first MME;
the sending module is further configured to send an RRC connection recovery complete message to the UE.
According to a third possible implementation manner of the third aspect, in a ninth possible implementation manner, the NB-IoT supporting capability of the UE sent by the sending module to the first MME further carries an NB-IoT supporting capability of each cell under the first base station, where the NB-IoT supporting capability of each cell under the first base station includes an uplink narrowband access capability of each cell under the first base station and a supporting capability based on a user plane and a control plane transmission optimization scheme;
the handover command further includes NB-IoT support capability of each cell under the third base station, and the NB-IoT support capability of each cell under the third base station includes uplink narrowband access capability of each cell under the third base station and support capability based on a user plane and a control plane transmission optimization scheme.
In a tenth possible implementation manner of the third aspect, the first base station and the fifth base station are connected through an X2 interface; the receiving module is further configured to send, to the fifth base station through the X2 interface, NB-IoT support capability of each cell under the first base station, where the NB-IoT support capability of each cell under the first base station includes uplink narrowband access capability of each cell under the first base station, and support capability based on a user plane and a control plane transmission optimization scheme;
the receiving module is further configured to receive NB-IoT supporting capability of each cell under the fifth base station, sent by the fifth base station through the X2 interface, where the NB-IoT supporting capability of each cell under the fifth base station includes an uplink narrowband access capability of each cell under the fifth base station, and a supporting capability based on a user plane and a control plane transmission optimization scheme.
In an eleventh possible implementation manner of the third aspect, the receiving module is further configured to receive an uplink narrowband access capability of the UE, where the uplink narrowband access capability is sent by the UE through a physical random access channel PRACH; the information transmission apparatus further includes:
and the determining module is used for determining that the uplink narrowband access capability of the UE is single-frequency access or multi-frequency access according to the type of the PRACH.
In a fourth aspect, the present invention provides an information transmission apparatus, which is disposed in a first mobility management entity MME, and includes:
a receiving module, configured to receive an NB-IoT supporting capability of a UE sent by a first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station by establishing a radio resource control RRC connection with the UE, and the NB-IoT supporting capability of the UE includes one or more of an uplink narrowband access capability of the UE and a supporting capability based on a user plane and a control plane transmission optimization scheme;
the storage module is configured to store NB-IoT support capabilities of the UE;
the sending module is configured to send the NB-IoT support capability of the UE to a second base station when the UE requests to establish an RRC connection through the second base station or the UE is switched from the first base station to the second base station under the first MME.
In a first possible implementation manner of the fourth aspect, the first MME is configured to, when the UE requests to establish an RRC connection through a second base station or the UE is handed over from the first base station to a second base station under the first MME;
the receiving module is further configured to receive an initial UE message sent by the second base station, where the initial UE message includes service request information;
the sending module is further configured to send an initial context setup request message to the second base station, where the initial context setup request message includes NB-IoT support capability of the UE.
In a second possible implementation manner of the fourth aspect, when the UE is handed over from a third base station under the second MME to the first base station;
the sending module is further configured to send a handover command to the first base station, where the handover command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, where the handover command includes NB-IoT support capability of the UE and a target address of handover, and the target address is a first base station under the first MME;
the receiving module is further configured to receive an NB-IoT supporting capability of the UE sent by the first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station through demodulating the handover command;
the storage module is further configured to store the NB-IoT support capability of the UE received by the receiving module.
In a third possible implementation manner of the fourth aspect, when the first base station allocates a radio resource for the UE;
the sending module is further configured to send an initial context setup request message to the first base station, where the initial context setup request message does not include NB-IoT support capability of the UE;
the receiving module is further configured to receive an NB-IoT support capability of the UE sent by the first base station, where the NB-IoT support capability of the UE is obtained by the first base station by sending a UE capability query message to the UE, and the NB-IoT support capability of the UE is used for the first base station to allocate radio resources to the UE;
the storage module is further configured to store the NB-IoT support capability of the UE received by the receiving module.
In a fourth possible implementation manner of the fourth aspect, the receiving module is further configured to receive a handover request sent by the first base station, where the handover request is sent to the first MME after the first base station receives measurement information sent by the UE, and the measurement information is used to indicate that a target base station to which the UE is handed over is a fourth base station;
the sending module is further configured to forward the handover request message to the fourth base station, where the first base station and the fourth base station are both under the first MME; alternatively, the first and second electrodes may be,
the sending module is further configured to send the handover request to a second MME, where the handover request is used to instruct the second MME to forward the handover request message to the fourth base station, where the fourth base station is under the second MME.
In a fifth possible implementation manner of the fourth aspect, the first base station acquires context information of the UE by establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an access stratum AS security context;
the receiving module is further configured to receive context information of the UE sent by the first base station, where the context information of the UE is sent to the first MME before the first base station suspends the established RRC connection;
the sending module is further configured to send context information of the UE to a base station to which the UE accesses when the UE initiates an optimization scheme based on user plane transmission.
According to a fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner, the receiving module is further configured to receive a UE context request message sent by the first base station after receiving context information of the UE sent by the first base station, where the UE context request message is sent to the first MME when the first base station receives an RRC connection recovery request message sent by the UE and the first base station does not store the context information of the UE;
the sending module is further configured to send a UE context response message to the first base station, where the UE context response message is used to instruct the first base station to send an RRC connection recovery complete message to the UE.
In a fifth aspect, the present invention provides an information delivery system comprising: a first Mobility Management Entity (MME), a first base station and a second base station under the first MME, a second MME, a third base station and a fourth base station under the second MME, wherein the first MME is connected with the second MME;
wherein the first base station, the second base station, the third base station and the fourth base station are all provided with the information transmission device according to any one of the third aspects, and the first MME and the second MME are all provided with the information transmission device according to any one of the fourth aspects.
According to the information transmission method, the device and the system, the first base station acquires the NB-IoT support capability of the UE by establishing RRC connection with the UE, the NB-IoT support capability of the UE can comprise one or more of uplink narrowband access capability of the UE and support capability of a transmission optimization scheme based on a user plane and a control plane, and the first base station instructs the first MME to store the NB-IoT support capability of the UE by sending the acquired NB-IoT support capability of the UE to the first MME, so that services are provided for subsequent services; the invention improves the practicability of the wireless connection service in NB-IoT by reasonably designing the transmission mode of the NB-IoT support capability of the UE.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of an information transmission method according to an embodiment of the present invention;
fig. 2 is a signaling interaction flow diagram for establishing an RRC connection in the information transmission method according to the embodiment shown in fig. 1;
fig. 3 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 4 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 5 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 6 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 7 is a signaling flowchart of an information transmission method according to an embodiment of the present invention;
fig. 8 is a signaling flowchart of another information transmission method according to an embodiment of the present invention;
fig. 9 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 10 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 11 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 12 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 13 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 14 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 15 is a signaling flowchart of another information transmission method according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of an information transmission apparatus according to an embodiment of the present invention;
fig. 17 is a schematic structural diagram of another information transmission method according to an embodiment of the present invention;
fig. 18 is a flowchart of another information transmission method according to an embodiment of the present invention;
fig. 19 is a schematic structural diagram of an information delivery system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
In the above background art, different uplink narrowband access capabilities and optimized data transmission schemes are introduced for the characteristics of low cost and small data volume transmission of the UE. Specifically, for the low-cost characteristic of the UE, the NB-IoT introduces different uplink narrowband access capabilities, including Single-Tone access (Single-Tone) and Multi-Tone access (Multi-Tone). For the UE with different narrow-band access capabilities, the base station can only allocate uplink channel resources of corresponding narrow-band bandwidths when allocating uplink resources; in addition, considering that the 200khz spectrum bandwidth of the NB-IoT is relatively small, spectrum resource fragments are easily generated when each Uplink frequency point simultaneously carries two different narrowband Physical channels, and the problem of complexity of resource scheduling of a Physical Uplink Shared Channel (PUSCH for short) is increased. Secondly, the NB-IoT introduces an optimized data transmission scheme aiming at the characteristic of small data volume; the basic idea of the optimization scheme based on control plane transmission is as follows: packing the Data Packet into a Non-Access Stratum (Non-Access Stratum) Packet Data Unit (PDU), namely an NAS PDU, and attaching the NAS PDU to a control plane signaling for transmission; the basic idea of the optimization scheme based on user plane transmission is as follows: the terminal and the base station use a Data Radio Bearer (DRB) to transmit Data, after the Data transmission is finished, both sides store Bearer information context, Access Stratum (AS) security context and the like, and when the Data is transmitted again in the following process, both sides quickly recover the use of the DRB Bearer through a suspend-activate process.
In the LTE system, if data is to be transmitted to a UE in an idle state, an MME needs to transmit a paging message to all evolved Node bs (eNB) in a Tracking Area (Tracking Area, abbreviated as TA) registered by the UE, and then the eNB forwards the paging message to the UE.
The technical solution of the present invention is described in detail below by specific embodiments, and the information transmission method in the following embodiments of the present invention relates to three network elements: the base station in each embodiment of the present invention is generally an evolved Node B (eNB) in a Long Term Evolution (Long Term Evolution, abbreviated as LTE) system. The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a flowchart of an information transmission method according to an embodiment of the present invention. The information transmission method provided by the embodiment is suitable for the case of transmitting the capability information in the NB-IoT, and the method can be executed by an information transmission device, which is implemented by combining hardware and software, and the device can be integrated in a processor of the base station for being called and used by the processor. As shown in fig. 1, the method of this embodiment may include:
s110, the first base station acquires the NB-IoT supporting capability of the UE by establishing RRC connection with the UE, wherein the NB-IoT supporting capability of the UE comprises one or more of uplink narrowband access capability of the UE and supporting capability based on a user plane and control plane transmission optimization scheme.
In this embodiment, the reason for triggering the first base station to establish Radio Resource Control (RRC) connection with the UE includes, for example, that the UE initially attaches, or an NB-IoT supporting capability of the UE changes, or the first base station allocates Radio resources to the UE and the first base station does not acquire the NB-IoT supporting capability of the UE, and in some cases, a specific manner for the first base station to acquire the NB-IoT supporting capability of the UE is shown in fig. 2, which is a signaling interaction flow diagram for establishing RRC connection in the information transmission method provided in the embodiment shown in fig. 1, that is, S110 specifically includes:
s1, the first base station receives the RRC connection request message sent by the UE.
S2, the first base station sends an RRC connection setup message to the UE.
S3, the first base station receives an RRC connection setup complete message sent by the UE.
S4, the first base station sends an initial UE message to the first MME, where the initial UE message includes attach request information, Tracking Area Update (TAU) request information, or service request information.
S5, the first base station receives an initial context setup request message sent by the first MME, where the initial context setup request message includes attach accept information, TAU accept information, or NB-IoT support capability of the UE.
In this embodiment, if the triggering reason for the first base station to establish the RRC connection with the UE is that the UE performs initial attach, the initial message of S4 specifically includes attach request information, and the initial context setup request message of S5 specifically includes attach accept information; if the trigger reason for the first base station to establish the RRC connection with the UE is that the NB-IoT support capability of the UE changes, the initial message of S4 specifically includes TAU request information, and the initial context establishment request message of S5 specifically includes TAU accept information; if the first base station allocates the radio resource to the UE and the first base station does not acquire the NB-IoT supporting capability of the UE, the initial message of S4 specifically includes the service request information, and the initial context setup request message of S5 does not include the NB-IoT supporting capability of the UE.
S6, the first base station sends a UE capability query message to the UE.
S7, the first base station receives a UE capability information indication message sent by the UE, wherein the UE capability information indication message comprises NB-IoT supporting capability of the UE. Specifically, the NB-IoT support Capability in this embodiment is included in a UE Radio Capability (UE Radio Capability) information element in the UE Capability information indication message.
It should be noted that the above-mentioned procedures, i.e., S1 to S7, are general procedures for establishing RRC connection, and when a UE reestablishes RRC connection through a different base station, the NB-IoT supporting capability of the UE needs to be sent to a currently accessed base station by re-executing the procedures, or when the NB-IoT supporting capability of the UE changes, the current NB-IoT supporting capability of the UE needs to be sent to the base station by re-executing the procedures.
S120, the first base station sends the NB-IoT support capability of the UE to the first MME to indicate the first MME to store the NB-IoT support capability of the UE and indicate the first MME to send the NB-IoT support capability of the UE to the base station currently accessed by the UE when the UE requests to reestablish RRC connection or the base station accessed by the UE is changed, and the base station currently accessed by the UE is under the first MME.
In this embodiment, after the first base station, the UE and the first MME execute the procedure shown in fig. 2, the first base station has NB-IoT support capability of the UE, and then the first base station sends the NB-IoT support capability of the UE to the first MME, so that the first MME stores the NB-IoT support capability of the UE in the first MME to provide a service for subsequent wireless services. For example, when the UE requests to re-establish the RRC connection, or a base station to which the UE accesses changes, the first MME may send the NB-IoT support capability of the UE to the base station to which the UE currently accesses.
It should be noted that, in each embodiment of the present invention, the first MME is an MME to which the first base station is accessed, and the purpose of the first base station sending the NB-IoT supporting capability of the UE to the first MME is to instruct the first MME to store the NB-IoT supporting capability of the UE, and use the NB-IoT supporting capability in subsequent wireless services.
In the information transmission method provided by this embodiment, the first base station acquires the NB-IoT support capability of the UE by establishing an RRC connection with the UE, where the NB-IoT support capability of the UE may include one or more of an uplink narrowband access capability of the UE and a support capability based on a user plane and a control plane transmission optimization scheme, and the first base station instructs the first MME to store the NB-IoT support capability of the UE by sending the acquired NB-IoT support capability of the UE to the first MME, so as to provide a service for a subsequent service; the embodiment improves the practicability of the wireless connection service in the NB-IoT by reasonably designing the transmission mode of the NB-IoT support capability of the UE.
It should be noted that, on the basis of the above embodiment shown in fig. 1, the first MME has stored therein the NB-IoT supporting capability of the UE, and the NB-IoT supporting capability of the UE can be applied to subsequent wireless services, and the following embodiments are all based on the embodiment shown in fig. 1; in addition, in the embodiments of the present invention that use the first base station side as the main execution entity, in describing the specific execution manner of the subsequent service, it may be assumed that the base station that establishes the RRC connection with the UE in the embodiment shown in fig. 1 is not the first base station, but another base station, for example, a base station under the first MME, and further, for example, another base station under another MME.
Further, fig. 3 is a flowchart of another information transmission method according to an embodiment of the present invention. The application scenario of this embodiment is that the RRC connection established between the UE and the first base station in the example shown in fig. 1 is already disconnected; or before the UE establishes the RRC connection with the second base station under the first MME, at this time, the UE needs to switch to the first base station under the first MME, that is, the UE needs to establish the RRC connection with the first base station, and then the method provided in this embodiment further includes:
s130, the first base station acquires the NB-IoT supporting capability of the UE from the first MME by reestablishing RRC connection with the UE.
In this embodiment, a specific manner in which the first base station acquires the NB-IoT supporting capability of the UE from the first MME may refer to the flowchart shown in fig. 2, and also needs to execute S1 to S5 in fig. 2, which is different from the flowchart shown in fig. 2, that the initial UE message in this embodiment S4 specifically includes the service request information, the initial context establishment request message received by the first base station in S5 includes the NB-IoT supporting capability of the UE, and the NB-IoT supporting capability of the UE is stored when the first MME establishes the RRC connection before, so that the first base station does not need to acquire the NB-IoT supporting capability of the UE by initiating a UE query message to the UE; that is to say, storing the NB-IoT support capability of the UE in the first MME provides a more convenient application manner for subsequent service, thereby improving service efficiency.
Fig. 4 is a flowchart of another information transmission method according to an embodiment of the present invention. An application scenario of this embodiment is that the UE establishes an RRC connection with a third base station under the second MME before, and at this time, the UE needs to be switched to the first base station under the first MME, that is, the UE needs to establish an RRC connection with the first base station, and then the method provided in this embodiment further includes:
s130, the first base station receives a switching command sent by the first MME, the switching command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, the switching command comprises NB-IoT supporting capability of UE and a switching target address, and the target address is the first base station under the first MME.
S140, the first base station demodulates the switching command and acquires the NB-IoT supporting capability of the UE in the switching command.
S150, the first base station sends the NB-IoT support capability of the UE to the first MME to instruct the first MME to store the NB-IoT support capability of the UE.
In this embodiment, after the first MME and the second MME receive the handover command, they do not parse the content of the handover command, that is, even if the first MME receives the handover command before the first base station, the first MME does not know the specific content in the handover command, and the purpose of the first MME and the second MME is only to deliver the handover command to the target base station, that is, the first base station.
Fig. 5 is a flowchart of another information transmission method according to an embodiment of the present invention. In an application scenario of this embodiment, a base station that has currently established an RRC connection with a UE is a first base station, that is, on the basis of the application scenario shown in fig. 1, the method provided in this embodiment further includes:
and S130, the first base station receives the measurement information sent by the UE, and the measurement information indicates the target base station switched by the UE to the first base station as a fourth base station.
S140, the first base station instructs the fourth base station to acquire a handover request message including the NB-IoT support capability of the UE through the measurement information, and the handover request message is used for instructing the second base station to allocate the radio resource for the UE according to the NB-IoT support capability of the UE.
In this embodiment, a target base station for UE handover, that is, a fourth base station may be both under the first MME and under other MMEs, and when the network locations of the fourth base station are different, the manners in which the fourth base station acquires the NB-IoT support capability of the UE are also different.
Optionally, if the first base station and the fourth base station are both under the first MME and the first base station and the fourth base station are connected through the X2 interface, S140 in this embodiment may be replaced with: the first base station sends a Handover Request message including the NB-IoT support capability of the UE to the fourth base station through an X2 interface, an X2 interface is an interface for connecting the base stations, and the base stations under the same MME can directly transmit through an X2 interface, specifically, the NB-IoT support capability of the UE is included in a Source to Target Transparent Container (Source to Target Transparent Container) cell in the Handover Request message (Handover Request) sent by the first base station.
Optionally, if an X2 interface is not provided between the first base station and the fourth base station, S140 in this embodiment may be replaced with: the method comprises the steps that a first base station sends a switching request message to a first MME, wherein the switching request message is used for indicating the first MME to forward the switching request message to a fourth base station, and the first base station and the fourth base station are both under the first MME; or the first base station sends a handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to the second MME, so that the second MME forwards the handover request message to a fourth base station, where the fourth base station is under the second MME.
It should be noted that, in the present embodiment, the transmission of the handover request message is implemented through an S1 interface, where the S1 interface is an interface between the base station and the MME; the source-to-target transparent container cell comprises NB-IoT support capability of the UE in a handover request message sent by a first base station to a first MME, a handover request message sent by the first MME to a fourth base station, a handover request message sent by the first MME to a second MME, and a handover request message sent by the second MME to the fourth base station.
Fig. 6 is a flowchart of another information transmission method according to an embodiment of the present invention. In an application scenario of this embodiment, a base station currently establishing an RRC connection with a UE is a first base station, and the first base station has obtained context information of the UE in a process of establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an Access Stratum (Access Stratum, abbreviated AS ") security context, that is, on the basis of the application scenario shown in fig. 1, the method provided in this embodiment further includes:
s130, the first base station determines to suspend the established RRC connection.
S140, the first base station sends context information of the UE to the first MME, and the context information of the UE is used for indicating the first MME to send the context information of the UE to the base station accessed by the UE when the UE initiates an optimization scheme based on user plane transmission.
S150, the first base station suspends the established RRC connection with the UE.
Further, the present embodiment further includes, after S140, on the basis of the method described above:
s160, the first base station receives an RRC connection recovery request message sent by the UE.
S170, if the first base station stores the context information of the UE, sending an RRC connection recovery complete message to the UE.
S180, if the context information of the UE is not stored in the first base station, sending a UE context request message to the first MME, and receiving a UE context response message returned by the first MME, thereby sending an RRC connection recovery completion message to the UE.
It should be noted that S170 and S180 in this embodiment are alternatively executed, and in the prior art, for an optimization scheme based on user plane transmission, a method proposed in the current standard is: the context information of the UE is stored in the original base station, when the UE moves to a new base station and initiates a service, the new base station obtains the context information stored in the original base station through an X2 port, or reestablishes the UE context information, and only the UE context information can be reestablished under the condition that an X2 interface does not exist between the original base station and the new base station, so that the advantages of the user plane transmission optimization scheme cannot be fully exerted. In this embodiment, the context information of the UE is sent to the first MME accessed by the first base station, and when the UE recovers the RRC connection through the activation procedure, the UE context information does not need to be re-established and is not limited by the X2 interface between the base stations.
It should be noted that, in the above embodiments of the present invention, when the NB-IoT supporting capability of the UE is transmitted between the base station and the MME, and at the same time, the NB-IoT supporting capability of the cell may also be transmitted between the MME and the base station, that is, the cell capability is transferred through dedicated signaling. For example, in the NB-IoT supporting capability of the UE sent by the first base station to the first MME in S120, the NB-IoT supporting capability of each cell under the first base station is also carried, where the NB-IoT supporting capability of each cell under the first base station includes the uplink narrowband access capability of each cell under the first base station and the supporting capability based on the user plane and control plane transmission optimization scheme; the handover command in the embodiment shown in fig. 4, for example, further includes NB-IoT support capability of each cell under the third base station, where the NB-IoT support capability of each cell under the third base station includes uplink narrowband access capability of each cell under the third base station, and support capability based on user plane and control plane transmission optimization scheme. In the above manner, the dedicated signaling for transferring the cell capability includes, for example: the handover request message and the handover request response message can also be carried indirectly through the failure reason in the request failure.
Fig. 7 is a signaling flowchart of an information transmission method according to an embodiment of the present invention. An application scenario of this embodiment is that a base station currently establishing an RRC connection with a UE is a first base station, and the first base station and a fifth base station are connected through an X2 interface, where this embodiment specifically describes a transfer manner of cell capabilities, and then the method provided in this embodiment further includes:
s101, the first base station sends NB-IoT supporting capability of each cell under the first base station to a fifth base station through an X2 interface, wherein the NB-IoT supporting capability of each cell under the first base station comprises uplink narrow-band access capability of each cell under the first base station and supporting capability of a transmission optimization scheme based on a user plane and a control plane.
S102, the first base station receives NB-IoT supporting capability of each cell under the fifth base station, which is sent by the fifth base station through an X2 interface, and the NB-IoT supporting capability of each cell under the fifth base station comprises uplink narrowband access capability of each cell under the fifth base station and supporting capability of a transmission optimization scheme based on a user plane and a control plane.
In this embodiment, the transmission between the first base station and the fifth base station is not the capability of the UE, but is the capability of the cell, and when the cell between the base stations is changed due to load balancing or mobility in the connection mode, the capability of the target cell selected by the UE needs to be matched with the capability of the UE, that is, the source base station needs to know the capability of the target cell, and the base station of the target cell also needs to know the capability of the source cell, so that the transmission of the cell capability affects the success rate of UE handover. In addition, the common signaling for transferring the cell capability in this embodiment includes, for example: an X2 setup request message and an X2 setup response message, a base station configuration update message and a message configuration update confirm message, a resource status request message and a resource status response message, etc.
It should be noted that, the embodiment shown in fig. 1 provides a manner for transmitting the uplink narrowband access capability of the UE, and in the information transmission method provided by the present invention, the uplink narrowband access capability of the UE may also be transmitted in other manners; specifically, a Physical Random Access Channel (PRACH) designs different transmission formats and types for an uplink narrowband Access capability of a UE, as shown in fig. 8, which is a signaling flow diagram of another information transmission method provided in an embodiment of the present invention, and this embodiment is only for transmission of the uplink narrowband Access capability of the UE, that is, the method provided in this embodiment may include:
s101, a first base station receives uplink narrow band access capability of UE sent by the UE through a PRACH.
And S102, the first base station determines that the uplink narrowband access capability of the UE is single-frequency access or multi-frequency access according to the type of the PRACH.
As shown in fig. 8, when the first base station receives a Single-Tone type PRACH, it considers that the UE initiating the PRACH procedure is a Single-Tone capable UE; when the first base station receives a Multi-Tone type PRACH, the UE initiating the PRACH procedure is considered to be a Multi-Tone capable UE.
Fig. 9 is a flowchart of another information transmission method according to an embodiment of the present invention. The information transmission method provided by the embodiment is suitable for the case that the NB-IoT performs paging control, and the method can be performed by an information transmission apparatus, which is implemented by combining hardware and software, and the apparatus can be integrated in a processor of an MME for being invoked by the processor. As shown in fig. 9, the method of this embodiment may include:
s210, the first MME receives NB-IoT supporting capability of the UE sent by the first base station, wherein the NB-IoT supporting capability of the UE is acquired by the first base station through establishing RRC connection with the UE, and the NB-IoT supporting capability of the UE comprises one or more of uplink narrow band access capability of the UE and supporting capability of a transmission optimization scheme based on a user plane and a control plane.
In this embodiment, the reason for triggering the first base station to establish the RRC connection with the UE may also include that the UE performs initial attach, an NB-IoT supporting capability of the UE changes, or the first base station allocates wireless resources to the UE, and the first base station does not acquire the NB-IoT supporting capability of the UE.
S220, the first MME stores NB-IoT support capability of the UE.
S230, when the UE requests to establish an RRC connection through the second base station or the UE switches from the first base station to the second base station under the first MME, the first MME sends the NB-IoT support capability of the UE to the second base station.
In this embodiment, after the first base station, the UE and the first MME execute the procedure shown in fig. 2, the first base station has NB-IoT support capability of the UE, and then the first MME receives and stores the NB-IoT support capability of the UE, so that the first MME provides a service for subsequent services. For example, when the UE requests to establish an RRC connection through the second base station, or the UE switches from the first base station to the second base station under the second MME, the first MME may send the NB-IoT support capability of the UE to the base station to which the UE is currently accessing.
It should be noted that, in each embodiment of the present invention, the first MME is an MME to which the first base station accesses, and the purpose of the first MME storing the NB-IoT supporting capability of the first base station for sending the UE is to use in subsequent wireless services.
In the information transmission method provided by this embodiment, a first MME receives an NB-IoT supporting capability of a UE sent by a first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station by establishing an RRC connection with the UE, the NB-IoT supporting capability of the UE may include one or more of an uplink narrowband access capability of the UE and a supporting capability based on a user plane and a control plane transmission optimization scheme, and the first MME provides a service when the UE initiates a subsequent wireless service by storing the NB-IoT supporting capability of the UE; the embodiment improves the practicability of the wireless connection service in the NB-IoT by reasonably designing the transmission mode of the NB-IoT support capability of the UE.
It should be noted that, on the basis of the above embodiment shown in fig. 9, the first MME has stored therein the NB-IoT supporting capability of the UE, and the NB-IoT supporting capability of the UE can be applied to subsequent wireless services, and the following embodiments are all based on the embodiment shown in fig. 9; in addition, in the embodiments of the present invention in which the first MME side is used as an execution subject, in describing a specific execution manner of the subsequent service, it may be assumed that the base station that establishes the RRC connection with the UE in the embodiment shown in fig. 1 is not the first base station, but another base station, for example, a base station under the first MME, and further, for example, another base station under another MME.
Further, fig. 10 is a flowchart of another information transmission method according to an embodiment of the present invention. In the application scenario of this embodiment, the UE requests to establish an RRC through the second base station; or, the UE needs to be handed over from the first base station to a second base station under the first MME, that is, the UE needs to establish an RRC connection with the second base station, the method provided in this embodiment further includes:
s240, the first MME receives an initial UE message sent by the second base station, where the initial UE message includes service request information.
S250, the first MME sends an initial context setup request message to the second base station, where the initial context setup request message includes NB-IoT support capability of the UE.
In this embodiment, before the first MME receives the initial UE message sent by the second base station, the step performed by the second base station may refer to S1 to S3 in the flow illustrated in fig. 2, and specifically, the second MME interacts with the UE through the message. In this embodiment, the NB-IoT support capability of the UE included in the initial context setup request message sent by the first MME to the second base station is stored by the first MME when the RRC connection is previously established. Therefore, the second base station does not need to acquire the NB-IoT support capability of the UE by initiating a UE query message to the UE, i.e., does not need to perform S6-S7 in the embodiment shown in fig. 2; that is to say, storing the NB-IoT support capability of the UE in the first MME provides a more convenient application manner for subsequent service, thereby improving service efficiency.
Fig. 11 is a flowchart of another information transmission method according to an embodiment of the present invention. An application scenario of this embodiment is that the UE establishes an RRC connection with a third base station under the second MME before, and at this time, the UE needs to be switched to the first base station under the first MME, that is, the UE needs to establish an RRC connection with the first base station, and then the method provided in this embodiment further includes:
s240, the first MME sends a switching command to the first base station, the switching command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, the switching command comprises NB-IoT supporting capability of the UE and a switching target address, and the target address is the first base station under the first MME.
S250, the first MME receives and stores the NB-IoT supporting capability of the UE sent by the first base station, wherein the NB-IoT supporting capability of the UE is acquired by the first base station through demodulating the switching command.
In this embodiment, after the first MME and the second MME receive the handover command, they do not parse the content of the handover command, that is, even if the first MME receives the handover command before the first base station, the first MME does not know the specific content in the handover command, and the purpose of the first MME and the second MME is only to deliver the handover command to the target base station, that is, the first base station.
Fig. 12 is a flowchart of another information transmission method according to an embodiment of the present invention. In an application scenario of this embodiment, a first base station prepares to allocate radio resources to a UE, and the first base station also needs to acquire an NB-IoT supporting capability of the UE by establishing an RRC connection with the UE, in this embodiment, a first MME accessed by the first base station already stores the NB-IoT supporting capability of the UE, but the first base station cannot acquire the NB-IoT supporting capability of the UE, and then the method provided in this embodiment further includes:
s240, the first MME receives an initial UE message sent by the first base station, where the initial UE message includes service request information.
S250, the first MME sends an initial context setup request message to the first base station, and the initial context setup request message does not include NB-IoT support capability of the UE.
S260, the first MME receives and stores the NB-IoT supporting capability of the UE sent by the first base station, the NB-IoT supporting capability of the UE is acquired by the first base station through sending a UE capability query message to the UE, and the NB-IoT supporting capability of the UE is used for the first base station to allocate wireless resources for the UE.
It should be noted that, the first base station in this embodiment also needs to execute S1 to S7 in fig. 2, and is different from the flow shown in fig. 2, in this embodiment, the initial UE message of S4 specifically includes the service request information, the initial context establishment request message received by the first base station in S5 does not include the NB-IoT support capability of the UE, and after the first base station acquires the NB-IoT support capability of the UE by initiating a UE query message to the UE, the first base station may allocate the radio resource to the UE through the NB-IoT support capability of the UE.
Fig. 13 is a flowchart of another information transmission method according to an embodiment of the present invention. In an application scenario of this embodiment, a base station that has currently established an RRC connection with a UE is a first base station, the UE needs to be handed over from the first base station to a fourth base station, and an X2 interface is not provided between the first base station and the fourth base station, that is, on the basis of the application scenario shown in fig. 9, the method provided in this embodiment further includes:
s240, the first MME receives a handover request sent by the first base station, where the handover request is sent to the first MME by the first base station after receiving measurement information sent by the UE, and the measurement information is used to indicate that a target base station for UE handover is a fourth base station.
S250, the first MME forwards a switching request message to a fourth base station, wherein the first base station and the fourth base station are both under the first MME; or the first MME sends a handover request to the second MME, where the handover request is used to instruct the second MME to forward a handover request message to a fourth base station, where the fourth base station is under the second MME.
In this embodiment, a target base station for UE handover, that is, a fourth base station may be both under the first MME and under other MMEs, and when the network locations of the fourth base station are different, the manners in which the fourth base station acquires the NB-IoT support capability of the UE are also different.
It should be noted that, in the present embodiment, the transmission of the handover request message is implemented through an S1 interface, where the S1 interface is an interface between the base station and the MME; the source-to-target transparent container cell comprises NB-IoT support capability of the UE in a handover request message sent by a first base station to a first MME, a handover request message sent by the first MME to a fourth base station, a handover request message sent by the first MME to a second MME, and a handover request message sent by the second MME to the fourth base station.
Fig. 14 is a flowchart of another information transmission method according to an embodiment of the present invention. In an application scenario of this embodiment, a base station currently establishing an RRC connection with a UE is a first base station, and the first base station has obtained context information of the UE in a process of establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an AS security context, that is, on the basis of the application scenario shown in fig. 9, the method provided in this embodiment further includes:
s240, the first MME receives the context information of the UE sent by the first base station, where the context information of the UE is sent to the first MME before the first base station suspends the established RRC connection.
S250, when the UE initiates an optimization scheme based on user plane transmission, the first MME sends the context information of the UE to a base station accessed by the UE.
Further, on the basis of the above method, the present embodiment further includes, after S250:
s260, the first MME receives a UE context request message sent by the first base station, where the UE context request message is sent to the first MME when the first base station receives an RRC connection recovery request message sent by the UE and the first base station does not store context information of the UE.
S270, the first MME sends a UE context response message to the first base station, where the UE context response message is used to instruct the first base station to send an RRC connection recovery complete message to the UE.
It should be noted that S260 and S270 in this embodiment are alternatively executed, and in the prior art, for an optimization scheme based on user plane transmission, a method proposed in the current standard is: the context information of the UE is stored in the original base station, when the UE moves to a new base station and initiates a service, the new base station obtains the context information stored in the original base station through an X2 port, or reestablishes the UE context information, and only the UE context information can be reestablished under the condition that an X2 interface does not exist between the original base station and the new base station, so that the advantages of the user plane transmission optimization scheme cannot be fully exerted. In this embodiment, the context information of the UE is sent to the first MME accessed by the first base station, and when the UE recovers the RRC connection through the activation procedure, the UE context information does not need to be re-established and is not limited by the X2 interface between the base stations.
Fig. 15 is a signaling flowchart of another information transmission method according to an embodiment of the present invention. The information transmission method provided by the embodiment is suitable for the case of transmitting the capability information in the NB-IoT, and the method can be executed by the UE, the base station and the MME. As shown in fig. 14, the method of this embodiment may include:
s301, the first base station acquires NB-IoT supporting capability of the UE by establishing RRC connection with the UE, wherein the NB-IoT supporting capability of the UE comprises one or more of uplink narrowband access capability of the UE and supporting capability based on a user plane and control plane transmission optimization scheme.
In this embodiment, the reason for triggering the first base station to establish the RRC connection with the UE also includes that the UE performs initial attach or the NB-IoT supporting capability of the UE changes, and in the two cases, the manner in which the first base station acquires the NB-IoT supporting capability of the UE may also be the flow shown in fig. 2, that is, the first base station and the UE acquire the NB-IoT supporting capability of the UE through signaling interaction in fig. 2. The specific implementation is the same as that shown in fig. 2, and therefore, the detailed description thereof is omitted.
S302, the first base station sends NB-IoT supporting capability of the UE to the first MME.
S303, the first MME stores NB-IoT support capability of the UE.
In this embodiment, the first MME stores NB-IoT support capabilities of the UE for the purpose of serving subsequent wireless traffic. For example, when the UE requests to re-establish the RRC connection, or a base station to which the UE accesses changes, the first MME may send the NB-IoT support capability of the UE to the base station to which the UE currently accesses.
It should be noted that, in this embodiment, the first base station and the first MME are accessed when the RRC connection is initially established for the UE, that is, the NB-IoT support capability of the UE is stored in the first MME, and in a subsequent application scenario of this embodiment, the first base station is a source base station, and the first MME is a source MME.
Further, in the method provided in this embodiment, the UE needs to establish an RRC connection with the second base station; or, the UE needs to switch the first base station to the second base station under the first MME, and the method provided in this embodiment further includes:
s304, the second base station acquires the NB-IoT supporting capability of the UE from the first MME by establishing RRC connection with the UE.
In this embodiment, referring to the flow shown in fig. 2 as well, the UE, the second base station, and the first MME may execute S1 to S5, where the initial UE message of S4 specifically includes the service request information, and the initial context setup request message sent by the first MME in S5 includes NB-IoT support capability of the UE, where the NB-IoT support capability of the UE is stored by the first MME when the first MME establishes the RRC connection before, so that the first base station does not need to acquire the NB-IoT support capability of the UE by initiating a UE query message to the UE. Note that, the second base station in this embodiment may be the first base station that previously established the RRC connection with the UE, or may be another base station under the first MME.
Further, in the method provided in this embodiment, the first base station under the first MME currently establishes the RRC connection with the UE, and the UE needs to be switched to the third base station under the second MME, that is, the UE needs to establish the RRC connection with the third base station, then the method provided in this embodiment further includes:
s305, the first base station sends a switching command to the first MME, wherein the switching command comprises NB-IoT supporting capability of the UE and a target address of switching, and the target address is a third base station under the second MME.
S306, the first MME sends a switching command to the second MME.
S307, the second MME sends a handover command to the third base station.
S308, the third base station demodulates the switching command and acquires the NB-IoT supporting capability of the UE in the switching command.
S309, the third base station sends the NB-IoT supporting capability of the UE to the second MME.
S310, the second MME stores NB-IoT support capability of the UE.
In this embodiment, after the third MME stores the NB-IoT support capability of the UE, the third MME may also provide a service for subsequent wireless services, that is, the method provided in this embodiment further includes:
s311, the fourth base station acquires the NB-IoT supporting capability of the UE from the second MME by establishing RRC connection with the UE. The specific implementation manner of S311 in this embodiment is the same as the specific implementation manner of S304, and it should be noted that the fourth base station in this embodiment may be a third base station that previously establishes an RRC connection with the UE, or may be another base station under the second MME.
Further, in the method provided in this embodiment, if any one of the base stations currently establishing an RRC connection with the UE is, for example, a third base station under the second MME, and if the third base station is ready to allocate radio resources to the UE, the initial context setup request message sent by the second MME may be acquired by performing S1 to S5, at this time, if the initial context setup request message does not include NB-IoT support capability of the UE, the method provided in this embodiment further includes:
s312, the third base station initiates a UE capability query message to the UE.
S313, the third base station receives a UE capability information indication message sent by the UE, wherein the UE capability information indication message comprises NB-IoT support capability of the UE.
Further, in the method provided in this embodiment, the first base station under the first MME currently establishes the RRC connection with the UE, and the method provided in this embodiment further includes:
and S314, the first base station receives the measurement information sent by the UE, and the measurement information indicates the target base station switched by the UE to the first base station as a fourth base station.
Optionally, if the first base station and the fourth base station are both under the first MME, and the first base station and the fourth base station are connected through an X2 interface, after S314, the method further includes:
s315, the first base station sends a handover request message including NB-IoT support capability of the UE to the fourth base station through the X2 interface.
Optionally, if an X2 interface is not provided between the first base station and the fourth base station, S313 further includes:
s315, the first base station sends a switching request message to the first MME.
S316, the first MME forwards the switching request message to the fourth base station. In this embodiment, the first base station and the fourth base station are both under the first MME.
In another possible implementation manner of this embodiment, after S314, the method may further include:
s315, the first base station sends a switching request message to the first MME.
S316, the first MME sends a switching request message to the second MME.
S317, the second MME forwards the handover request message to the fourth base station. In this embodiment, the first base station is under the first MME, and the fourth base station is under the second MME.
Further, what is currently connected with the UE through RRC is a first base station under the first MME, and the first base station has obtained context information of the UE in a process of establishing RRC with the UE, where the context information of the UE includes one or more of a bearer information context and an AS security context, and the method provided in this embodiment further includes:
s318, the first base station determines to suspend the established RRC connection.
S319, the first base station judges whether the first MME stores the context information of the UE; if not, executing S320; if yes, S321 is performed.
S320, the first base station sends the context information of the UE to the first MME, and the context information of the UE is used for indicating the first MME to send the context information of the UE to the base station accessed by the UE when the UE initiates an optimization scheme based on user plane or control plane transmission.
S321, the first base station suspends the established RRC connection with the UE.
The present embodiment further includes, after S321, on the basis of the above method:
s322, the first base station receives an RRC connection recovery request message sent by the UE.
S323, the first base station determines whether to store the context information of the UE. If not, go to S324; if yes, go to S326.
S324, the first base station sends a UE context request message to the first MME.
And S325, the first MME returns a UE context response message to the first base station.
S326, the first base station sends an RRC connection recovery complete message to the UE.
Fig. 16 is a schematic structural diagram of an information transmission apparatus according to an embodiment of the present invention. The information transmission device provided by the embodiment is suitable for the case of transmitting the capability information in the NB-IoT, and is implemented by combining hardware and software, and the device can be integrated in a processor of the base station for the processor to call and use. As shown in fig. 16, the apparatus of the present embodiment may include: a receiving module 11 and a transmitting module 12.
The receiving module 11 and the sending module 12 are configured to acquire an NB-IoT supporting capability of the UE by establishing a radio resource control RRC connection with the UE, where the NB-IoT supporting capability of the UE includes one or more of an uplink narrowband access capability of the UE and a supporting capability based on a user plane and a control plane transmission optimization scheme.
In this embodiment, the reason for triggering the first base station to establish the RRC connection with the UE includes, for example, that the UE performs initial attach, or that the NB-IoT support capability of the UE changes, or that the first base station allocates radio resources to the UE and the first base station does not acquire the NB-IoT support capability of the UE. The specific way of acquiring the NB-IoT support capability of the UE by establishing a wireless RRC connection with the UE is as follows: a receiving module 11, configured to receive an RRC connection request message sent by a UE; a sending module 12, configured to send an RRC connection setup message to the UE; the receiving module 11 is further configured to receive an RRC connection setup complete message sent by the UE; a sending module 12, further configured to send an initial UE message to the first MME, where the initial UE message includes attach request information, TAU request information, or does not include NB-IoT support capability of the UE; a receiving module 11, further configured to receive an initial context setup request message sent by the first MME, where the initial context setup request message includes attach acceptance information, TAU acceptance information, or does not include NB-IoT support capability of the UE; the sending module 12 is further configured to send a UE capability query message to the UE; the receiving module 11 is further configured to receive a UE capability information indication message sent by the UE, where the UE capability information indication message includes NB-IoT support capability of the UE.
It should be noted that, the first base station acquires the NB-IoT support capability of the UE through the receiving module 11 and the sending module 12, and is a general way of establishing an RRC connection.
The sending module 12 is further configured to send the NB-IoT support capability of the UE to the first mobility management entity MME to indicate that the first MME stores the NB-IoT support capability of the UE, and indicate that the first MME sends the NB-IoT support capability of the UE to the base station to which the UE is currently accessed when the UE requests to reestablish the RRC connection or a base station to which the UE is accessed is changed, where the base station to which the UE is currently accessed is under the first MME.
It should be noted that, in each embodiment of the present invention, the first MME is an MME to which the first base station is accessed, and the purpose of the first base station sending the NB-IoT supporting capability of the UE to the first MME is to instruct the first MME to store the NB-IoT supporting capability of the UE, and use the NB-IoT supporting capability in subsequent wireless services.
The information transmission apparatus provided in the embodiment of the present invention is used for executing the information transmission method provided in the embodiment of fig. 1 of the present invention, and has corresponding functional modules, which have similar implementation principles and technical effects, and are not described herein again.
It should be noted that, on the basis of the above-mentioned embodiment shown in fig. 16, the first MME has stored therein the NB-IoT supporting capability of the UE, and the NB-IoT supporting capability of the UE can be applied to the subsequent wireless services, and the following embodiments are all based on the embodiment shown in fig. 16; in addition, in the embodiments of the present invention that use the first base station side as the main execution entity, in describing the specific execution manner of the subsequent service, it may be assumed that the base station that establishes the RRC connection with the UE in the embodiment shown in fig. 16 is not the first base station, but another base station, for example, a base station under the first MME, and further, for example, another base station under another MME.
Further, the application scenario of this embodiment is that the RRC connection established between the UE and the first base station in the example shown in fig. 16 is already disconnected; or, before the UE establishes the RRC connection with the second base station under the first MME, at this time, the UE needs to be switched to the first base station under the first MME, that is, the UE needs to establish the RRC connection with the first base station, and the receiving module 11 and the sending module 12 in this embodiment are further configured to obtain the NB-IoT support capability of the UE from the first MME by reestablishing the RRC connection with the UE; the specific implementation mode is as follows: a receiving module 11, configured to receive an RRC connection request message sent by the UE; a sending module 12, configured to send an RRC connection setup message to the UE; the receiving module 11 is further configured to receive an RRC connection setup complete message sent by the UE; a sending module 12, configured to send an initial UE message to the first MME, where the initial UE message includes service request information; the receiving module 11 is further configured to receive an initial context setup request message sent by the first MME, where the initial context setup request message includes NB-IoT support capability of the UE.
The information transmission apparatus provided in the embodiment of the present invention is used for executing the information transmission method provided in the embodiment of fig. 3 of the present invention, and has corresponding functional modules, which have similar implementation principles and technical effects, and are not described herein again.
Further, fig. 17 is a schematic structural diagram of another information transmission method according to an embodiment of the present invention. The application scenario of this embodiment is that the UE establishes an RRC connection with a third base station under a second MME before, and at this time, the UE needs to be switched to a first base station under a first MME, that is, the UE needs to establish an RRC connection with the first base station, and the specific implementation manner is: the receiving module 11 is further configured to receive a handover command sent by the first MME, where the handover command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, where the handover command includes NB-IoT support capability of the UE and a target address of handover, and the target address is the first base station under the first MME; the information transmission apparatus provided in this embodiment further includes: a demodulation module 13, configured to demodulate the handover command and obtain NB-IoT support capability of the UE in the handover command; the sending module 12 is further configured to send the NB-IoT support capability of the UE to the first MME to instruct the first MME to store the NB-IoT support capability of the UE.
The information transmission apparatus provided in the embodiment of the present invention is used for executing the information transmission method provided in the embodiment of fig. 4 of the present invention, and has corresponding functional modules, which have similar implementation principles and technical effects, and are not described herein again.
Further, in the application scenario of this embodiment, the base station that has currently established RRC connection with the UE is the first base station, that is, on the basis of the application scenario shown in fig. 16, the receiving module 11 is further configured to receive measurement information sent by the UE, and the measurement information indicates, to the first base station, that the target base station to which the UE is handed over is the fourth base station; the sending module 12 is further configured to instruct, through the measurement information, the fourth base station to obtain a handover request message including an NB-IoT support capability of the UE, where the handover request message is used to instruct the second base station to allocate radio resources to the UE according to the NB-IoT support capability of the UE.
In this embodiment, a target base station for UE handover, that is, a fourth base station may be both under the first MME and under other MMEs, and when the network locations of the fourth base station are different, the manners in which the fourth base station acquires the NB-IoT support capability of the UE are also different.
Optionally, if the first base station and the fourth base station are both under the first MME and the first base station and the fourth base station are connected through the X2 interface, the sending module 12 is configured to instruct the fourth base station to obtain the handover request message including the NB-IoT support capability of the UE through the measurement information, where the step is to: the sending module 12 is further configured to send a handover request message including NB-IoT support capability of the UE to the fourth base station through an X2 interface.
Optionally, if an X2 interface is not set between the first base station and the fourth base station, the sending module 12 is configured to instruct the fourth base station to obtain a handover request message including an NB-IoT supporting capability of the UE through the measurement information, where the handover request message includes: sending a switching request message to a first MME, wherein the switching request message is used for indicating the first MME to forward the switching request message to a fourth base station, and the first base station and the fourth base station are both under the first MME; or sending a handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to the second MME, so that the second MME forwards the handover request message to a fourth base station, where the fourth base station is under the second MME. It should be noted that, in the present embodiment, the transmission of the handover request message is implemented through an S1 interface, where the S1 interface is an interface between the base station and the MME.
The information transmission apparatus provided in the embodiment of the present invention is used for executing the information transmission method provided in the embodiment of fig. 5 of the present invention, and has corresponding functional modules, which have similar implementation principles and technical effects, and are not described herein again.
Further, an application scenario of this embodiment is that a base station currently establishing an RRC connection with a UE is a first base station, and the first base station has acquired context information of the UE in a process of establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an AS security context, and based on a structure of the apparatus shown in fig. 17, the apparatus provided in this embodiment further includes: a determination module 14 and a suspension module 15; wherein, the determining module 14 is configured to determine to suspend the established RRC connection; the sending module 12 is further configured to send context information of the UE to the first MME, where the context information of the UE is used to instruct the first MME to send the context information of the UE to a base station to which the UE accesses when the UE initiates an optimization scheme based on user plane transmission; a suspending module 15, configured to suspend the RRC connection established with the UE.
On the basis of the embodiment shown in fig. 17, in the apparatus provided in this embodiment, the receiving module 11 is further configured to receive an RRC connection resumption request message sent by the UE after the suspending module 15 suspends the RRC connection established with the UE; the information transmission apparatus further includes: a determining module 16, configured to determine whether the first base station stores context information of the UE; the sending module 12 is further configured to send an RRC connection recovery complete message to the UE when the determining module 16 determines that the context information of the UE is stored in the first base station; the sending module 12 is further configured to send a UE context request message to the first MME when the determining module 16 determines that the context information of the UE is not stored in the first base station; a receiving module 11, further configured to receive a UE context response message returned by the first MME; accordingly, the sending module 12 is further configured to send an RRC connection recovery complete message to the UE.
The information transmission apparatus provided in the embodiment of the present invention is used for executing the information transmission method provided in the embodiment of fig. 6 of the present invention, and has corresponding functional modules, which have similar implementation principles and technical effects, and are not described herein again.
It should be noted that, in the above embodiments of the present invention, when the NB-IoT supporting capability of the UE is transmitted between the base station and the MME, and at the same time, the NB-IoT supporting capability of the cell may also be transmitted between the MME and the base station, that is, the cell capability is transferred through dedicated signaling. For example, in the NB-IoT supporting capability of the UE sent by the first base station to the first MME in S120, the NB-IoT supporting capability of each cell under the first base station is also carried, where the NB-IoT supporting capability of each cell under the first base station includes the uplink narrowband access capability of each cell under the first base station and the supporting capability based on the user plane and control plane transmission optimization scheme; for example, the handover command in the above embodiment further includes NB-IoT supporting capability of each cell under the third base station, where the NB-IoT supporting capability of each cell under the third base station includes uplink narrowband access capability of each cell under the third base station, and supporting capability based on the user plane and control plane transmission optimization scheme. In the above manner, the dedicated signaling for transferring the cell capability includes, for example: the handover request message and the handover request response message can also be carried indirectly through the failure reason in the request failure.
Further, an application scenario of this embodiment is that a base station currently establishing an RRC connection with the UE is a first base station, and the first base station and a fifth base station are connected through an X2 interface, where a transmission manner of a cell capability is specifically described in this embodiment; the sending module 12 is further configured to send, to the fifth base station through an X2 interface, NB-IoT support capability of each cell under the first base station, where the NB-IoT support capability of each cell under the first base station includes uplink narrowband access capability of each cell under the first base station, and support capability of a transmission optimization scheme based on a user plane and a control plane; the receiving module 11 is further configured to receive NB-IoT supporting capability of each cell under the fifth base station, where the NB-IoT supporting capability of each cell under the fifth base station is sent by the fifth base station through an X2 interface, and the NB-IoT supporting capability of each cell under the fifth base station includes uplink narrowband access capability of each cell under the fifth base station, and supporting capability of a transmission optimization scheme based on a user plane and a control plane.
The information transmission apparatus provided in the embodiment of the present invention is used for executing the information transmission method provided in the embodiment of fig. 7 of the present invention, and has corresponding functional modules, which have similar implementation principles and technical effects, and are not described herein again.
It should be noted that, the embodiment shown in fig. 16 provides a manner for transmitting the uplink narrowband access capability of the UE, and in the information transmission apparatus provided in the present invention, the uplink narrowband access capability of the UE may also be transmitted in other manners; specifically, the receiving module 11 is further configured to receive an uplink narrowband access capability of the UE sent by the UE PRACH; correspondingly, the determining module 14 is further configured to determine, according to the type of the PRACH, that the uplink narrowband access capability of the UE is single frequency access or multiple frequency access.
The information transmission apparatus provided in the embodiment of the present invention is used for executing the information transmission method provided in the embodiment of fig. 8 of the present invention, and has corresponding functional modules, which have similar implementation principles and technical effects, and are not described herein again.
Fig. 18 is a schematic structural diagram of another information transmission apparatus according to an embodiment of the present invention. The information transmission device provided by the embodiment is suitable for the case of transmitting the capability information in the NB-IoT, and is implemented by combining hardware and software, and the device can be integrated in a processor of the MME for the processor to call and use. As shown in fig. 18, the apparatus of the present embodiment may include: a receiving module 21, a storage module 22 and a transmitting module 23.
The receiving module 21 is configured to receive an NB-IoT supporting capability of the UE sent by the first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station by establishing a radio resource control RRC connection with the UE, and the NB-IoT supporting capability of the UE includes one or more of an uplink narrowband access capability of the UE and a supporting capability of a transmission optimization scheme based on a user plane and a control plane.
In this embodiment, the reason for triggering the receiving module 21 to establish the RRC connection with the UE may also include that the UE performs initial attach, an NB-IoT supporting capability of the UE changes, or the first base station allocates wireless resources to the UE and does not acquire the NB-IoT supporting capability of the UE, and in these cases, a specific manner in which the first base station acquires the NB-IoT supporting capability of the UE may also refer to the manner shown in fig. 2, and therefore details thereof are not described herein.
A storage module 22 for storing NB-IoT support capabilities of the UE.
A sending module 23, configured to send the NB-IoT support capability of the UE to the second base station when the UE requests to establish an RRC connection through the second base station or the UE is handed over from the first base station to the second base station under the first MME.
In this embodiment, after the first base station, the UE and the first MME execute the procedure shown in fig. 2, the first base station has NB-IoT support capability of the UE, and then the first MME receives and stores the NB-IoT support capability of the UE, so that the first MME provides a service for subsequent services. For example, when the UE requests to establish an RRC connection through the second base station, or the UE switches from the first base station to the second base station under the second MME, the first MME may send the NB-IoT support capability of the UE to the base station to which the UE is currently accessing.
It should be noted that, in each embodiment of the present invention, the first MME is an MME to which the first base station accesses, and the purpose of the first MME storing the NB-IoT supporting capability of the first base station for sending the UE is to use in subsequent wireless services.
It should be noted that, on the basis of the embodiment shown in fig. 18, the storage module 22 of the first MME has stored therein the NB-IoT supporting capability of the UE, and the NB-IoT supporting capability of the UE can be applied to subsequent wireless services, and the following embodiments are all based on the embodiment shown in fig. 18; in addition, in the embodiments of the present invention in which the first MME side is used as the main execution entity, in the description of the specific execution mode of the subsequent service, it may be assumed that the base station that establishes the RRC connection with the UE in the embodiment shown in fig. 18 is not the first base station, but another base station, for example, a base station under the first MME, and further, for example, another base station under another MME.
Further, the application scenario of this embodiment is that the UE requests to establish RRC through the second base station; or, the UE needs to be switched from the first base station to a second base station under the first MME, that is, the UE needs to establish an RRC connection with the second base station, in the apparatus provided in this embodiment, the receiving module 21 is further configured to receive an initial UE message sent by the second base station, where the initial UE message includes service request information; the sending module 23 is further configured to send an initial context setup request message to the second base station, where the initial context setup request message includes NB-IoT support capability of the UE.
In this embodiment, before the receiving module 21 receives the initial UE message sent by the second base station, the step executed by the second base station may refer to S1-S3 in the flow shown in fig. 2, and specifically, the second base station performs message interaction with the UE. In this embodiment, the NB-IoT support capability of the UE included in the initial context setup request message sent by the first MME to the second base station is stored by the first MME when the RRC connection is previously established. Therefore, the second base station does not need to acquire the NB-IoT support capability of the UE by initiating a UE query message to the UE, i.e., does not need to perform S6-S7 in the embodiment shown in fig. 2; that is to say, storing the NB-IoT support capability of the UE in the first MME provides a more convenient application manner for subsequent service, thereby improving service efficiency.
Further, in an application scenario of this embodiment, the UE previously establishes an RRC connection with a third base station under the second MME, and at this time, the UE needs to be switched to the first base station under the first MME, that is, the UE needs to establish the RRC connection with the first base station, in the apparatus provided in this embodiment, the sending module 23 is further configured to send a switching command to the first base station, where the switching command is sent to the second MME by the third base station and is forwarded to the first MME by the second MME, where the switching command includes an NB-IoT support capability of the UE and a target address of the switching, and the target address is the first base station under the first MME; the receiving module 21 is further configured to receive an NB-IoT supporting capability of the UE sent by the first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station through demodulating the handover command; the storage module 22 is further configured to store the NB-IoT support capability of the UE received by the receiving module 21.
Further, in an application scenario of this embodiment, a first base station prepares to allocate radio resources to a UE, and the first base station also needs to acquire an NB-IoT supporting capability of the UE by establishing an RRC connection with the UE, in this embodiment, a first MME accessed by the first base station already stores the NB-IoT supporting capability of the UE, and the first base station cannot acquire the NB-IoT supporting capability of the UE, then in the apparatus provided in this embodiment, the receiving module 21 is further configured to receive an initial UE message sent by the first base station, where the initial UE message includes service request information; a sending module 23, configured to send an initial context setup request message to the first base station, where the initial context setup request message does not include NB-IoT support capability of the UE; the receiving module 21 is further configured to receive an NB-IoT supporting capability of the UE sent by the first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station by sending a UE capability query message to the UE, and the NB-IoT supporting capability of the UE is used for the first base station to allocate radio resources to the UE; the storage module 22 is further configured to store the NB-IoT support capability of the UE received by the receiving module 21.
It should be noted that, the first base station in this embodiment also needs to execute S1 to S7 in fig. 2, and is different from the flow shown in fig. 2, in this embodiment, the initial UE message of S4 specifically includes the service request information, the initial context establishment request message received by the first base station in S5 does not include the NB-IoT support capability of the UE, and after the first base station acquires the NB-IoT support capability of the UE by initiating a UE query message to the UE, the first base station may allocate the radio resource to the UE through the NB-IoT support capability of the UE.
Further, in an application scenario of this embodiment, a base station that has currently established an RRC connection with the UE is a first base station, the UE needs to be switched from the first base station to a fourth base station, and an X2 interface is not provided between the first base station and the fourth base station, in the apparatus provided in this embodiment, the sending module 23 is further configured to forward a handover request message to the fourth base station, where the first base station and the fourth base station are both under the first MME; or, the sending module 23 is further configured to send a handover request to the second MME, where the handover request is used to instruct the second MME to forward a handover request message to a fourth base station, where the fourth base station is under the second MME.
In this embodiment, a target base station for UE handover, that is, a fourth base station may be both under the first MME and under other MMEs, and when the network locations of the fourth base station are different, the manners in which the fourth base station acquires the NB-IoT support capability of the UE are also different. It should be noted that, in the present embodiment, the transmission of the handover request message is implemented through an S1 interface, where the S1 interface is an interface between the base station and the MME.
Further, in an application scenario of this embodiment, a base station currently establishing an RRC connection with the UE is a first base station, and the first base station has obtained context information of the UE in a process of establishing an RRC connection with the UE, where the context information of the UE includes one or more of a bearer information context and an AS security context, in the apparatus provided in this embodiment, the receiving module 21 is further configured to receive the context information of the UE sent by the first base station, and the context information of the UE is sent to the first MME before the first base station suspends the established RRC connection; the sending module 23 is further configured to send context information of the UE to a base station to which the UE accesses when the UE initiates an optimization scheme based on user plane transmission.
It should be noted that, the receiving module 21 of this embodiment is further configured to receive a UE context request message sent by the first base station after receiving the context information of the UE sent by the first base station, where the UE context request message is sent to the first MME when the first base station receives the RRC connection resumption request message sent by the UE and the first base station does not store the context information of the UE; the sending module 23 is further configured to send a UE context response message to the first base station, where the UE context response message is used to instruct the first base station to send an RRC connection recovery complete message to the UE.
The information transmission apparatus provided in the embodiment of the present invention is used to execute the information transmission method provided in the embodiments shown in fig. 9 to fig. 14 of the present invention, and has corresponding functional modules, which implement similar principles and technical effects, and are not described herein again.
It should be noted that the information transmission device according to the embodiments of the present invention may also be stored in a computer readable storage medium if it is implemented in the form of a software functional module and sold or used as a standalone product. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for enabling a computer device, such as a personal computer, a server, or a network device, to execute all or part of the information transmission method according to the present invention. Specifically, the storage medium may include: various media capable of storing program codes, such as a USB flash disk (USB flash disk, abbreviated as "U" disk), a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software. Accordingly, the present invention also provides a computer storage medium in which a computer program is stored, the computer program being used for executing the implementation method provided by the present invention.
Fig. 19 is a schematic structural diagram of an information delivery system according to an embodiment of the present invention. The information delivery system provided by the present embodiment is suitable for use in the case of NB-IoT for information transmission, and generally includes: a first MME100, and a first base station 110 and a second base station 120 under the first MME100, and a second MME200, and a third base station 210 and a fourth base station 220 under the second MME 200.
In the present embodiment, the first base station 110, the second base station 120, the third base station 210, and the fourth base station 220 are all provided with the information transmission devices in the embodiments shown in fig. 16 and 17, and the first MME100 and the second MME200 are each provided with the information transmission devices in the embodiments shown in fig. 18; in the system of this embodiment, the first base station and the second base station may be connected through an X2 interface, the third base station and the fourth base station may also be connected through an X2 interface, and the first MME is connected to the second MME. The method for performing information transmission by each network element in the information transmission system of this embodiment is the same as the method for performing information transmission by the corresponding network element in the embodiments shown in fig. 16 to fig. 18, and is also used to perform the information transmission method provided in any one of the embodiments shown in fig. 1 to fig. 15 of the present invention, and the method is provided with corresponding entity devices, which have similar implementation principles and technical effects, and are not described herein again.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (37)

1. An information transmission method, comprising:
the method comprises the steps that a first base station acquires the NB-IoT supporting capability of the UE through establishing Radio Resource Control (RRC) connection with the UE, wherein the NB-IoT supporting capability of the UE comprises one or more of uplink narrow-band access capability of the UE and supporting capability based on a user plane and control plane transmission optimization scheme;
the first base station sends NB-IoT support capability of the UE to a first Mobility Management Entity (MME) to indicate the first MME to store the NB-IoT support capability of the UE and indicate the first MME to send the NB-IoT support capability of the UE to a base station which is currently accessed by the UE when the UE requests to reestablish RRC connection or the base station which is accessed by the UE is changed, wherein the base station which is currently accessed by the UE is under the first MME;
the first base station receives uplink narrow band access capability of the UE sent by the UE through a Physical Random Access Channel (PRACH);
and the first base station determines that the uplink narrowband access capability of the UE is single-frequency access or multi-frequency access according to the type of the PRACH.
2. The information transmission method according to claim 1, wherein the first base station acquires the narrowband internet of things (NB-IoT) support capability of the User Equipment (UE) through Radio Resource Control (RRC) connection with the UE, and the method comprises the following steps:
when the UE is initially attached, or the NB-IoT support capability of the UE is changed, or the first base station allocates wireless resources for the UE, and the first base station does not acquire the NB-IoT support capability of the UE, the first base station sends a UE capability query message to the UE;
the first base station receives a UE capability information indication message sent by the UE, wherein the UE capability information indication message comprises NB-IoT supporting capability of the UE.
3. The information transmission method according to claim 1, wherein when the UE requests re-establishment of RRC connection or when the UE is handed over from a second base station under the first MME to the first base station, the method further comprises:
the first base station acquires NB-IoT support capability of the UE from the first MME by reestablishing RRC connection with the UE;
the method for acquiring the NB-IoT support capability of the UE from the first MME by the first base station comprises the following steps:
the first base station sends an initial UE message to the first MME, wherein the initial UE message comprises service request information;
the first base station receives an initial context setup request message sent by the first MME, wherein the initial context setup request message comprises NB-IoT supporting capability of the UE.
4. The information transmission method according to claim 1, wherein when the UE is handed over from a third base station under a second MME to the first base station, the method further comprises:
the first base station receives a handover command sent by the first MME, wherein the handover command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, the handover command comprises NB-IoT support capability of the UE and a target address of handover, and the target address is the first base station under the first MME;
the first base station demodulates the switching command and acquires NB-IoT support capability of the UE in the switching command;
the first base station sends the NB-IoT support capability of the UE to the first MME to instruct the first MME to store the NB-IoT support capability of the UE.
5. The information transmission method according to claim 1, further comprising:
the first base station receives measurement information sent by the UE, and the measurement information indicates the target base station switched by the UE to the first base station as a fourth base station;
the first base station indicates the fourth base station to acquire a handover request message including the NB-IoT support capability of the UE through the measurement information, and the handover request message is used for indicating the fourth base station to allocate wireless resources for the UE according to the NB-IoT support capability of the UE.
6. The information transmission method according to claim 5, wherein the first base station and the fourth base station are both under the first MME, and the first base station and the fourth base station are connected through an X2 interface; the first base station instructs the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE through the measurement information, including:
the first base station sends the handover request message including NB-IoT support capabilities of the UE to the fourth base station over the X2 interface.
7. The information transmission method according to claim 5, wherein an X2 interface is not provided between the first base station and the fourth base station; the first base station instructs the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE through the measurement information, including:
the first base station sends the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to the fourth base station, where the first base station and the fourth base station are both under the first MME; alternatively, the first and second electrodes may be,
the first base station sends the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to a second MME, so that the second MME forwards the handover request message to a fourth base station, where the fourth base station is under the second MME.
8. The information transmission method according to claim 1, wherein the first base station acquires context information of the UE by establishing an RRC connection with the UE, and the context information of the UE includes one or more of a bearer information context and an access stratum, AS, security context; the method further comprises the following steps:
the first base station determining to suspend the established RRC connection;
the first base station sends the context information of the UE to the first MME, and the context information of the UE is used for indicating the first MME to send the context information of the UE to a base station accessed by the UE when the UE initiates an optimization scheme based on user plane transmission;
the first base station suspends the RRC connection established with the UE.
9. The information transmission method according to claim 8, wherein after the first base station suspends the RRC connection established with the UE, the method further comprises:
the first base station receives an RRC connection recovery request message sent by the UE;
if the context information of the UE is stored in the first base station, sending an RRC connection recovery completion message to the UE;
and if the context information of the UE is not stored in the first base station, sending a UE context request message to the first MME, and receiving a UE context response message returned by the first MME, thereby sending an RRC connection recovery completion message to the UE.
10. The information transmission method according to claim 4, wherein the NB-IoT support capability of each cell under the first base station is further carried in the NB-IoT support capability of the UE sent by the first base station to the first MME, and the NB-IoT support capability of each cell under the first base station includes an uplink narrowband access capability of each cell under the first base station and a support capability based on a user plane and a control plane transmission optimization scheme;
the handover command further includes NB-IoT support capability of each cell under the third base station, and the NB-IoT support capability of each cell under the third base station includes uplink narrowband access capability of each cell under the third base station and support capability based on a user plane and a control plane transmission optimization scheme.
11. The information transmission method according to claim 1, wherein the first base station and a fifth base station are connected via an X2 interface, the method further comprising:
the first base station sends NB-IoT supporting capability of each cell under the first base station to the fifth base station through the X2 interface, wherein the NB-IoT supporting capability of each cell under the first base station comprises uplink narrowband access capability of each cell under the first base station and supporting capability based on a user plane and control plane transmission optimization scheme;
the first base station receives NB-IoT supporting capability of each cell under the fifth base station, which is sent by the fifth base station through the X2 interface, and the NB-IoT supporting capability of each cell under the fifth base station comprises uplink narrowband access capability of each cell under the fifth base station and supporting capability based on a user plane and control plane transmission optimization scheme.
12. An information transmission method, comprising:
a first Mobility Management Entity (MME) receives NB-IoT supporting capability of User Equipment (UE) sent by a first base station, wherein the NB-IoT supporting capability of the UE is acquired by the first base station through establishing Radio Resource Control (RRC) connection with the UE, and the NB-IoT supporting capability of the UE comprises one or more of uplink narrow-band access capability of the UE and supporting capability based on a user plane and control plane transmission optimization scheme;
the first MME stores NB-IoT support capabilities of the UE;
the first MME sends the NB-IoT support capability of the UE to a second base station when the UE requests to establish RRC connection through the second base station or the UE is switched from the first base station to the second base station under the first MME;
the first base station receives uplink narrow band access capability of the UE sent by the UE through a Physical Random Access Channel (PRACH);
and the first base station determines that the uplink narrowband access capability of the UE is single-frequency access or multi-frequency access according to the type of the PRACH.
13. The information transmission method according to claim 12, wherein the first MME sends the NB-IoT support capability of the UE to a second base station when the UE requests to establish an RRC connection through the second base station or the UE is handed over from the first base station to the second base station under the first MME, comprising:
the first MME receives an initial UE message sent by the second base station, wherein the initial UE message comprises service request information;
the first MME sends an initial context setup request message to the second base station, wherein the initial context setup request message comprises NB-IoT supporting capability of the UE.
14. The information transmission method according to claim 12, wherein when the UE is handed over from a third base station under a second MME to the first base station, the method further comprises:
the first MME sends a switching command to the first base station, wherein the switching command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, the switching command comprises NB-IoT supporting capability of the UE and a switching target address, and the target address is the first base station under the first MME;
and the first MME receives and stores the NB-IoT supporting capability of the UE sent by the first base station, wherein the NB-IoT supporting capability of the UE is acquired by the first base station through demodulating the switching command.
15. The information transmission method according to claim 12, wherein when the first base station allocates radio resources for the UE, the method further comprises:
the first MME sends an initial context setup request message to the first base station, and the initial context setup request message does not include NB-IoT support capability of the UE;
the first MME receives and stores the NB-IoT supporting capability of the UE sent by the first base station, the NB-IoT supporting capability of the UE is obtained by the first base station through sending a UE capability query message to the UE, and the NB-IoT supporting capability of the UE is used for the first base station to allocate wireless resources for the UE.
16. The information transmission method according to claim 12, further comprising:
the first MME receives a switching request sent by the first base station, the switching request is sent to the first MME after the first base station receives measurement information sent by the UE, and the measurement information is used for indicating that a target base station switched by the UE is a fourth base station;
the first MME forwards the switching request message to the fourth base station, wherein the first base station and the fourth base station are both under the first MME; alternatively, the first and second electrodes may be,
the first MME sends the switching request to a second MME, and the switching request is used for indicating the second MME to forward the switching request message to a fourth base station, wherein the fourth base station is under the second MME.
17. The information transmission method according to claim 12, wherein the first base station acquires context information of the UE by establishing an RRC connection with the UE, and the context information of the UE includes one or more of a bearer information context and an access stratum, AS, security context; the method further comprises the following steps:
the first MME receives context information of UE sent by the first base station, wherein the context information of the UE is sent to the first MME before the first base station suspends the established RRC connection;
and the first MME sends the context information of the UE to a base station accessed by the UE when the UE initiates an optimization scheme based on user plane transmission.
18. The information transmission method according to claim 17, wherein after the first MME receives the context information of the UE sent by the first base station, the method further comprises:
the first MME receives a UE context request message sent by the first base station, wherein the UE context request message is sent to the first MME when the first base station receives an RRC connection recovery request message sent by the UE and the context information of the UE is not stored in the first base station;
the first MME sends a UE context response message to the first base station, wherein the UE context response message is used for indicating the first base station to send an RRC connection recovery completion message to the UE.
19. An information transmission apparatus provided in a first base station, the information transmission apparatus comprising: the device comprises a receiving module and a sending module;
the receiving module and the sending module are configured to acquire a narrowband internet of things (NB-IoT) support capability of a User Equipment (UE) by establishing a Radio Resource Control (RRC) connection with the UE, where the NB-IoT support capability of the UE includes one or more of an uplink narrowband access capability of the UE and a support capability based on a user plane and a control plane transmission optimization scheme;
the sending module is further configured to send the NB-IoT support capability of the UE to a first mobility management entity MME to instruct the first MME to store the NB-IoT support capability of the UE, and instruct the first MME to send the NB-IoT support capability of the UE to a base station currently accessed by the UE when the UE requests to reestablish RRC connection or a base station accessed by the UE changes, where the base station currently accessed by the UE is under the first MME;
the receiving module is further configured to receive the uplink narrowband access capability of the UE sent by the UE through a physical random access channel PRACH; the information transmission apparatus further includes:
and the determining module is used for determining that the uplink narrowband access capability of the UE is single-frequency access or multi-frequency access according to the type of the PRACH.
20. The information transmission apparatus according to claim 19, wherein the receiving module and the sending module are configured to obtain the narrowband internet of things NB-IoT supporting capability of the UE through a radio resource control RRC connection with the UE, and include:
when the UE is initially attached, or the NB-IoT support capability of the UE is changed, or the first base station allocates wireless resources to the UE, and the first base station does not acquire the NB-IoT support capability of the UE, the sending module is further configured to send a UE capability query message to the UE;
the receiving module is further configured to receive a UE capability information indication message sent by the UE, where the UE capability information indication message includes NB-IoT support capability of the UE.
21. The apparatus of claim 19, wherein when the UE requests to re-establish the RRC connection, or when the UE is handed over from a second base station under the first MME to the first base station;
the receiving module and the sending module are further configured to acquire an NB-IoT support capability of the UE from the first MME by reestablishing an RRC connection with the UE;
the receiving module and the sending module are configured to acquire an NB-IoT support capability of a UE, and include:
the sending module is further configured to send an initial UE message to the first MME, where the initial UE message includes service request information;
the receiving module is further configured to receive an initial context setup request message sent by the first MME, where the initial context setup request message includes an NB-IoT support capability of the UE.
22. The information transmission apparatus according to claim 19, wherein when the UE is handed over from a third base station under a second MME to the first base station;
the receiving module is further configured to receive a handover command sent by the first MME, where the handover command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, where the handover command includes an NB-IoT support capability of the UE and a target address of handover, and the target address is a first base station under the first MME;
the information transmission apparatus further includes: a demodulation module, configured to demodulate the handover command and obtain NB-IoT support capability of the UE in the handover command;
the sending module is further configured to send the NB-IoT support capability of the UE to the first MME to instruct the first MME to store the NB-IoT support capability of the UE.
23. The information transmission apparatus according to claim 19, wherein the receiving module is further configured to receive measurement information sent by the UE, and the measurement information indicates, to the first base station, that a target base station to which the UE is handed over is a fourth base station;
the sending module is further configured to instruct, through the measurement information, the fourth base station to obtain a handover request message including an NB-IoT support capability of the UE, where the handover request message is used to instruct the fourth base station to allocate radio resources to the UE according to the NB-IoT support capability of the UE.
24. The information transmission apparatus according to claim 23, wherein the first base station and the fourth base station are both under the first MME, and the first base station and the fourth base station are connected by an X2 interface;
the sending module is configured to instruct, through the measurement information, the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE, where the handover request message includes: sending the handover request message including NB-IoT support capabilities of the UE to the fourth base station over the X2 interface.
25. The information transmission apparatus according to claim 23, wherein an X2 interface is not provided between the first base station and the fourth base station;
the sending module is configured to instruct, through the measurement information, the fourth base station to acquire a handover request message including an NB-IoT support capability of the UE, where the handover request message includes: sending the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to the fourth base station, where the first base station and the fourth base station are both under the first MME; or sending the handover request message to the first MME, where the handover request message is used to instruct the first MME to forward the handover request message to a second MME, so that the second MME forwards the handover request message to a fourth base station, where the fourth base station is under the second MME.
26. The apparatus for information transmission according to claim 19, wherein the first base station acquires context information of the UE by establishing an RRC connection with the UE, and the context information of the UE includes one or more of a bearer information context and an access stratum, AS, security context; the information transmission apparatus further includes: a determining module and a suspending module;
the determining module is configured to determine to suspend the established RRC connection;
the sending module is further configured to send context information of the UE to the first MME, where the context information of the UE is used to instruct the first MME to send the context information of the UE to a base station to which the UE accesses when the UE initiates an optimization scheme based on user plane transmission;
the suspending module is configured to suspend the RRC connection established with the UE.
27. The apparatus for information transmission according to claim 26, wherein the receiving module is further configured to receive an RRC connection resume request message sent by the UE after the suspending module suspends the RRC connection established with the UE; the information transmission apparatus further includes:
a judging module, configured to judge whether the context information of the UE is stored in the first base station;
the sending module is further configured to send an RRC connection recovery complete message to the UE when the determining module determines that the context information of the UE is stored in the first base station;
the sending module is further configured to send a UE context request message to the first MME when the determining module determines that the context information of the UE is not stored in the first base station;
the receiving module is further configured to receive a UE context response message returned by the first MME;
the sending module is further configured to send an RRC connection recovery complete message to the UE.
28. The apparatus according to claim 22, wherein the NB-IoT support capability of the UE sent by the sending module to the first MME further carries NB-IoT support capability of each cell under the first base station, and the NB-IoT support capability of each cell under the first base station includes uplink narrowband access capability of each cell under the first base station and support capability based on user plane and control plane transmission optimization scheme;
the handover command further includes NB-IoT support capability of each cell under the third base station, and the NB-IoT support capability of each cell under the third base station includes uplink narrowband access capability of each cell under the third base station and support capability based on a user plane and a control plane transmission optimization scheme.
29. The information transmission apparatus according to claim 19, wherein the first base station and the fifth base station are connected by an X2 interface; the receiving module is further configured to send, to the fifth base station through the X2 interface, NB-IoT support capability of each cell under the first base station, where the NB-IoT support capability of each cell under the first base station includes uplink narrowband access capability of each cell under the first base station, and support capability based on a user plane and a control plane transmission optimization scheme;
the receiving module is further configured to receive NB-IoT supporting capability of each cell under the fifth base station, sent by the fifth base station through the X2 interface, where the NB-IoT supporting capability of each cell under the fifth base station includes an uplink narrowband access capability of each cell under the fifth base station, and a supporting capability based on a user plane and a control plane transmission optimization scheme.
30. An information transmission apparatus disposed in a first Mobility Management Entity (MME), the apparatus comprising:
a receiving module, configured to receive an NB-IoT supporting capability of a UE sent by a first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station by establishing a radio resource control RRC connection with the UE, and the NB-IoT supporting capability of the UE includes one or more of an uplink narrowband access capability of the UE and a supporting capability based on a user plane and a control plane transmission optimization scheme;
a storage module to store NB-IoT support capabilities of the UE;
a sending module, configured to send an NB-IoT support capability of the UE to a second base station when the UE requests to establish an RRC connection through the second base station or the UE is handed over from the first base station to the second base station under the first MME;
the first base station receives uplink narrow band access capability of the UE sent by the UE through a Physical Random Access Channel (PRACH); and the first base station determines that the uplink narrowband access capability of the UE is single-frequency access or multi-frequency access according to the type of the PRACH.
31. The apparatus of claim 30, wherein the first MME is configured to, when the UE requests to establish an RRC connection via a second base station or the UE is handed over from the first base station to a second base station under the first MME;
the receiving module is further configured to receive an initial UE message sent by the second base station, where the initial UE message includes service request information;
the sending module is further configured to send an initial context setup request message to the second base station, where the initial context setup request message includes NB-IoT support capability of the UE.
32. The apparatus of claim 30, wherein when the UE is handed over from a third base station under a second MME to the first base station;
the sending module is further configured to send a handover command to the first base station, where the handover command is sent to the second MME by the third base station and forwarded to the first MME by the second MME, where the handover command includes NB-IoT support capability of the UE and a target address of handover, and the target address is a first base station under the first MME;
the receiving module is further configured to receive an NB-IoT supporting capability of the UE sent by the first base station, where the NB-IoT supporting capability of the UE is obtained by the first base station through demodulating the handover command;
the storage module is further configured to store the NB-IoT support capability of the UE received by the receiving module.
33. The information transmission apparatus according to claim 30, wherein when the first base station allocates radio resources for the UE;
the sending module is further configured to send an initial context setup request message to the first base station, where the initial context setup request message does not include NB-IoT support capability of the UE;
the receiving module is further configured to receive an NB-IoT support capability of the UE sent by the first base station, where the NB-IoT support capability of the UE is obtained by the first base station by sending a UE capability query message to the UE, and the NB-IoT support capability of the UE is used for the first base station to allocate radio resources to the UE;
the storage module is further configured to store the NB-IoT support capability of the UE received by the receiving module.
34. The apparatus for information transmission according to claim 30, wherein the receiving module is further configured to receive a handover request sent by the first base station, where the handover request is sent to the first MME by the first base station after receiving measurement information sent by the UE, and the measurement information is used to indicate that a target base station to which the UE is handed over is a fourth base station;
the sending module is further configured to forward the handover request message to the fourth base station, where the first base station and the fourth base station are both under the first MME; alternatively, the first and second electrodes may be,
the sending module is further configured to send the handover request to a second MME, where the handover request is used to instruct the second MME to forward the handover request message to the fourth base station, where the fourth base station is under the second MME.
35. The apparatus for information transmission according to claim 30, wherein the first base station acquires context information of the UE by establishing an RRC connection with the UE, and the context information of the UE includes one or more of a bearer information context and an access stratum, AS, security context;
the receiving module is further configured to receive context information of the UE sent by the first base station, where the context information of the UE is sent to the first MME before the first base station suspends the established RRC connection;
the sending module is further configured to send context information of the UE to a base station to which the UE accesses when the UE initiates an optimization scheme based on user plane transmission.
36. The apparatus for information transmission according to claim 35, wherein the receiving module is further configured to receive a UE context request message sent by the first base station after receiving the context information of the UE sent by the first base station, where the UE context request message is sent to the first MME when the first base station receives the RRC connection resumption request message sent by the UE and the first base station does not store the context information of the UE;
the sending module is further configured to send a UE context response message to the first base station, where the UE context response message is used to instruct the first base station to send an RRC connection recovery complete message to the UE.
37. An information delivery system, comprising: a first Mobility Management Entity (MME), a first base station and a second base station under the first MME, a second MME, a third base station and a fourth base station under the second MME, wherein the first MME is connected with the second MME;
wherein the first base station, the second base station, the third base station and the fourth base station are all provided with an information transmission device according to any one of claims 19 to 29, and the first MME and the second MME are all provided with an information transmission device according to any one of claims 30 to 36.
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