Downlink data transmission method, device and system
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A technology of downlink data and transmission method, applied in the field of communication
Active Publication Date: 2014-06-04
DATANG MOBILE COMM EQUIP CO LTD
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[0020] It can be seen that for the downlink small data transmission of the UMTS system, the existing UMTS scheme of using the control plane to transmit small data needs to use the
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Embodiment 1
[0067] In this embodiment, the downlink data is carried in the paging message sent by the CN to the RNC, and the RNC sends the downlink data and security parameters to the UE together when establishing the RRC connection.
[0068] At this time, the paging message also carries downlink data;
[0069] In step S203, establish a radio resource control RRC connection and perform downlink data transmission, which specifically includes:
[0070] The access reason sent by the receiving UE is the RRC connection establishment message in response to the paging;
[0071] The security parameters of the user equipment UE are determined according to the security parameters carried in the paging message, and an RRC connection establishment message carrying the security parameters of the UE is returned to the UE. The RRC connection establishment message also carries the downlink data transmission indication and the use of security context encryption. downlink data;
[0072] After the UE comp...
Embodiment 2
[0085] After the RRC connection is established and the security parameters are activated, the downlink data is transmitted.
[0086] At this time, in step S203, the radio resource control RRC connection is established, and downlink data transmission is performed, wherein the security activation is performed while the RRC connection is established, which specifically includes:
[0087] The access reason sent by the receiving UE is the RRC connection establishment message in response to the paging;
[0088] Determine the security parameters of the UE according to the security parameters carried in the paging message, and return an RRC connection establishment message carrying the security parameters of the UE to the UE;
[0089] Receive the RRC connection establishment complete message returned by the UE after the establishment of the RRC connection is completed;
[0090] After the encryption is started and the UE starts encryption, the downlink data is directly transmitted.
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Abstract
The invention discloses a downlink data transmission method, device and system and relates to the communication technology. The downlink data transmission method includes the steps that when a core network needs to send downlink data, a paging message carrying a downlink data transmission instruction is sent, after an RNC receives the paging message, it can be determined that security activation needs to be conducted, then identifiers of security parameters carried in the paging message and identifiers of user equipment UE are stored, the UE is paged according to UE parameters, security activation is conducted when RRC connection is established, and downlink data transmission is conducted. Therefore, air interface signaling overheads generated for security activation are reduced, access delay generated for security activation is shortened, and the effects that air inference signaling overhead reducing and access delay reducing during downlink data transmission are achieved.
Description
technical field [0001] The present invention relates to communication technologies, and in particular, to a downlink data transmission method, device and system. Background technique [0002] Machine to Machine (M2M) communication is a trend of future intelligent development. The third-generation mobile communication system and its long-term evolution system need to support Machine Type Communications (MTC) functions. In many MTC application scenarios, the MTC device only sends a small amount of data to the network side. If the traditional data transmission mode is adopted, that is, the user plane transmission mode, a large signaling overhead will be generated in the process of establishing the signaling carried by the user plane, and the system efficiency is low. Currently, in the standard discussion, there is a method of transmitting user data on the control plane to transmit small amount of data, which can reduce the signaling required for establishing and maintaining u...
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Application Information
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