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Random access method, base station, user equipment and system

A technology of random access and random access process, applied in electrical components, wireless communication and other directions, can solve problems such as the inability to guarantee seamless handover, and achieve the effect of reducing service interruption

Active Publication Date: 2011-11-09
ZTE CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a random access method, base station, user equipment and system, so as to at least solve the problem in the related art that the seamless handover of the UE from the source base station to the target base station cannot be guaranteed

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  • Random access method, base station, user equipment and system
  • Random access method, base station, user equipment and system
  • Random access method, base station, user equipment and system

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Embodiment Construction

[0022] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0023] In LTE-A, after the UE enters the connected state, it can communicate with the source base station through multiple component carriers (such as CC1, CC2) at the same time, one of which is the Primary Component Carrier (PCC for short) such as CC1, and others such as CC2 are Secondary Component Carrier (SCC for short), NAS (NetworkAttached Storage, network attached storage) information is obtained through PCC, if DL PCC (downlink PCC) occurs RLF (Reliable Linked Frame, reliable chained frame), UE The RRC (Radio Resource Control, radio resource control) reconstruction process needs to be performed. The RRC reconstruction process will inevitably lead to service interruption, and the DL SCC can be ...

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Abstract

The invention discloses a random access method, base stations, user equipment and a system. The method comprises the following steps: a target base station receives a switching request message sent by a source base station; the target base station determines the random access component carrier (RCC) of the UE (User Equipment) on the target base station and sends a switching request response message to the source base station, and the switching request response message comprises the RCC information and random access resource information on the RCC; the source base station receives the switching request response message and sends a switching command; and after receiving the switching command, the UE keeps communicating with the source base station and initiates a random access process at the RCC. Through the invention, the seamless switching of the UE from the source base station to the target base station is ensured, and business interruption is reduced.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a random access method, base station, user equipment and system during handover. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, before the UE (User Equipment, user equipment) sends data to the base station, it needs to obtain uplink synchronization with the base station, that is, to obtain the transmission time advance (Time Advance, referred to as TA), and the UE passes random access process to achieve this goal. When the UE is in the connected state and needs to perform handover, it needs to disconnect the communication with the source base station, initiate random access at the target base station, and obtain downlink synchronization with the base station and TA. After the random access is completed, the UE can communicate with the target base station Normal communication. [0003] In order to provide mobile users wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/08H04W68/00H04W74/08
Inventor 陈中明杜忠达
Owner ZTE CORP
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