Random access method in (LTE)-A system

An LTE-A, random access technology, applied in electrical components, wireless communication, etc., can solve problems affecting access speed, delay, and rapid response, and achieve the effect of reducing delay and improving success rate

Inactive Publication Date: 2011-04-13
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0020]However, the existing back-off algorithm whose back-off parameters are determined by eNB cannot respond quickly according to system load changes and adjust the back-off parameters in time. The back-off algorithm is still used in the access process, which undoubtedly brings unnecessary delay to the access process and affects the access speed

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  • Random access method in (LTE)-A system

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Embodiment Construction

[0042] Such as figure 2 As shown in , it is the application scenario of the present invention, including adjacent cell base stations C1, C2, C3, edge user equipment UE1, UE2. In combination with this scenario, taking the access of the edge user equipment UE1 as an example, the content of the present invention be elaborated.

[0043] A preferred embodiment of the present invention is mainly realized through the following stages, and the specific realization process is as follows: image 3 as shown in:

[0044] In the first stage, the user terminal equipment searches and camps in a cell, as in step 301, and then judges whether it is at the edge of the cell, that is, whether it is an edge user equipment, as in step 302. If the current user terminal equipment is not an edge user equipment, perform random access according to the existing random access method in the long-term evolution system (not marked in the figure); otherwise, go to step 303 and execute the second stage.

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Abstract

The invention relates to the technical field of the random access of wireless communication, in particular to a random access method in a long term evolution (LTE)-A system. The random access method comprises the following steps of: sending random access lead codes to a resident cell base station and a candidate service cell base station by edge user equipment; when random access response is received in a specified time window, sending a MSG 3 message to the corresponding base station; after the edge user equipment sends the MSG 3 message, judging whether a competitive solution message is received within preset time or not by the edge user equipment, if the competitive solution message is received, judging whether an identifier in the competitive solution message is matched with an identifier in the correspondingly-sent MSG 3 or not, and if the competitive solution message is not received, executing the withdrawal process according to the priority level, and issuing an access request to the corresponding base station again; and if the identifier in the competitive solution message is matched with the identifier in the correspondingly-sent MSG 3, sending a hybrid automatic repeat request (HARQ) confirming message to complete the random access. By the method, the success rate of the random access of edge users is improved, and the time delay of the random access is reduced.

Description

technical field [0001] The invention relates to the field of random access technology of wireless communication, in particular to a random access method in an LTE-A system. Background technique [0002] IMT-2000 (International Mobile Telecommunications-2000) is a global standard for third-generation wireless communications defined by the International Telecommunication Union. An IMT-Advanced (IMT-A for short) system is a mobile system with new capabilities beyond the capabilities of IMT-2000. The system is capable of providing a wide range of telecommunication services: increasingly advanced mobile services based on packet transmission supported by mobile and fixed networks. [0003] Random access is the access process of the terminal before starting to communicate with the network, and is a decisive link to ensure the establishment of communication. In an LTE (Long Term Evolution, long-term evolution technology) system, random access is mainly used for initial registratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
Inventor 周文安卢宪祺何炜文朱超平冯艳
Owner BEIJING UNIV OF POSTS & TELECOMM
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