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Method, device and system for transmitting downlink information
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A message and execution time technology, applied in wireless communication, connection management, electrical components, etc., can solve problems such as downlink information transmission failure
Pending Publication Date: 2021-03-30
ZTE CORP
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[0006] However, in the fifth generation mobile communication system, such as figure 1 As shown, the UE's air interface RRC state introduces the RRC inactive (RRC_INACTIVE) state, that is, the UE's air interface RRC state has three types, namely RRC_INACTIVE state, RRC_IDLE state and RRC_CONNECTED state; and, when the UE's core network state is CM_IDLE state , the UE's air interface RRC state is RRC_IDLE state; when the UE's core network state is CM_CONNECTED state, the UE's air interface RRC state is RRC_CONNECTED state or RRC_INACTIVE state; then, when using the above method to transmit downlink information, if the UE's core network state is CM_CONNECTED state, and the RRC state of the air interface of the UE is RRC_INACTIVE state, then, after the RAN receives the downlink information transmitted by the AMF, the RAN needs to perform paging first, and the downlink information can be transmitted to the UE only after the paging is successful; if the paging fails, the Downlink information will be discarded by RAN, so there is a risk of downlink information transmission failure
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Embodiment 1
[0335] In this embodiment, the core network state of the UE stored in the AMF is the CM_CONNECTED state, but the RRC state of the air interface is unknown. When the AMF needs to sense the RRC state of the air interface of the UE immediately, the AMF actively acquires the RRC state of the air interface of the UE.
[0336] see Figure 11 , the method includes:
[0337] Step 1101, the AMF sends a first N2 layer message to the RAN, expecting to obtain the current air interface RRC status of the UE.
[0338] In this step, the N2 layer message refers to the message terminated in the RAN through the N2 interface of the RAN and the AMF.
[0339] In this step, the first N2 layer message may be a newly added N2 layer message specially used to obtain the air interface RRC state of the UE; or, a new field is added in an existing N2 layer message, and the newly added field is used to carry The RAN is required to return the indication information of the air interface RRC state of the UE....
Embodiment 2
[0343] In this embodiment, the core network state of the UE stored in the AMF is the CM_CONNECTED state, but the RRC state of the UE's air interface is the RRC_INACTIVE state. When the AMF needs to trigger the UE to enter the RRC_CONNECTED state immediately, the AMF triggers the UE to enter the RRC_CONNECTED state.
[0344] see Figure 12 , the method includes:
[0345] Step 1201, the AMF sends a third N2 layer message to the RAN, indicating to trigger the UE to enter the RRC_CONNECT state.
[0346] In this step, the third N2 layer message may be a newly added N2 layer message used to trigger the RAN to perform paging, and then trigger the UE to enter the RRC_CONNECTED state; or, add a new field in the existing N2 layer message, add The field of is used to carry the indication information that requires the RAN to perform paging and trigger the UE to enter the RRC_CONNECTED state.
[0347] Step 1202, the RAN receives the third N2 message from the AMF, triggers the air interf...
Embodiment 3
[0353] In this embodiment, the core network state of the UE stored in the AMF is the CM_CONNECTED state, but the RRC state of the air interface is unknown. The AMF actively requests the UE's air interface RRC state, and if the UE is in the RRC_INACTIVE state, it will trigger the user to enter the RRC_CONNECTED state at the same time.
[0354] see Figure 13 , the method includes:
[0355] Step 1301, the AMF sends a fourth N2 layer message to the RAN, expecting to obtain the current air interface RRC state of the UE, and expecting the UE to enter the RRC_CONNECTED state if the UE is in the RRC_INACTIVE state.
[0356] In this step, the N2 layer message refers to the message terminated in the RAN through the N2 interface of the RAN and the AMF.
[0357]In this step, the fourth N2 layer message may be a newly added N2 layer message specially used to obtain the air interface RRC state of the UE, and if the UE is in the RRC_INACTIVE state, it is expected that the UE enters the RR...
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Abstract
The embodiment of the invention discloses a method, a device and a system for transmitting downlink information. The method comprises the following steps: receiving a Namf_MT_EnableUEReachability message of a network function NF; when the core network state of the user equipment UE is a CM_CONNECTED state, executing any one or more of the following states: acquiring an air interface radio resourcecontrol RRC state of the UE, and when the air interface RRC state of the UE is an RRC_CONNECTED state, and returning a Namf_MT_EnableUEReachability response message to the NF; obtaining an air interface RRC state of the UE, triggering the UE to enter an RRC_CONNECTED state when the air interface RRC state of the UE is an RRC_INACTIVE state, and returning a Namf_MT_EnableUEReachability response message to the NF; acquiring an air interface RRC state of UE, triggering the UE to enter an RRC_CONNECTED state when the air interface RRC state of the UE is an RRC_INACTIVE state, and returning a Namf_MT_EnableUEReachability response message to an NF (Network Function). According to the embodiment of the invention, after the UE is ensured to enter the RRC_CONNECTED state, the Namf_MT_EnableUEReachability response message is returned to the NF, and the NF issues the downlink NAS message to complete the transmission of the downlink information, so the possibility of successful transmission of the downlink information is improved.
Description
technical field [0001] Embodiments of the present invention relate to but are not limited to the field of mobile communications, especially a method, device and system for transmitting downlink information. Background technique [0002] At present, the core network access and mobility management function (AMF, Access and Mobility Management Function) provides the Namf_mobile station called (MT, Mobile Terminated) service, which can provide Namf_MT_EnableUEReachability operation for other network functions (NF, Network Function), This service can ensure that the UE enters the reachable state, so that the caller NF can deliver subsequent downlink information to the UE through the AMF. [0003] Currently, there are two core network states of the UE, which are connection management (CM, Connection Management) idle (CM_IDLE) state and CM connected (CM_CONNECTED) state; the UE's air interface radio resource control (RRC, RadioResource Control) state also has two states: The two t...
Claims
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Application Information
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