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Random access method

A technology of random access and random access sequence, applied in electrical components, wireless communication and other directions, can solve the problem that the random access of UE cannot be used, the transmission subband of the random access response cannot be obtained, and the random access response cannot be received normally. message, etc.

Inactive Publication Date: 2012-12-05
POTEVIO INFORMATION TECH
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Problems solved by technology

In this way, for a broadband access system in which the UE supports a single subband working mode, due to the limited receiving bandwidth of the UE, it cannot receive multiple subbands at the same time, and the UE may not be able to know the sending subband of the random access response. The random access response message is normally received, therefore, the random access method of the UE cannot be realized by using the existing LTE system random access method

Method used

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Embodiment 2

[0052] Embodiment 2 of the present invention mainly includes the following steps:

[0053] Step 401, the UE determines the synchronization subband used for the current random access, and randomly selects one of the random access sequences corresponding to the cluster where the synchronization subband is located as the current random access sequence; The selected random access sequence is sent to the base station; according to the index number preamble_id of the selected random access sequence and the index number f_id of the cluster where the synchronization subband is located, determine the random access wireless network temporary identifier RA-RNTI and the base station Common subbands and radio frames granted by the physical downlink control channel PDCCH.

[0054] In this step, the method of determining the synchronization subband used for the current random access and determining the RA-RNTI is the same as that of step 301, and will not be repeated here.

[0055] In this ...

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Abstract

The invention provides a random access method. After sending a random access pilot frequency code on a physical random access channel resource, UE (user equipment) determines a RA-RNTI (random access-radio network temporary identity) as well as a common sub-band and a wireless frame used by a base station for the authorization of a physical downlink control channel PDCCH according to an index number Preamble_id of a sent random access sequence and the index number of a cluster in which a used synchronization sub-band is located, so as to skip to the wireless frame and the common sub-band to monitor a random access response. After receiving the Preamble code sent by the UE, the base station determines a wireless frame and a common sub-band used in sending the random access response based on the same method as the UE. Therefore, the UE supporting a single sub-band working mode is ensured to be able to normally accomplish the random access process, and the random access method is suitable for a wideband access system in which ''UE supporting single sub-band working mode'' is introduced.

Description

technical field [0001] The present invention relates to a random access technology in a wireless communication system, in particular to a random access method in a broadband access system. Background technique [0002] Random access technology is an important technology of medium access control in communication system. In the broadband access system based on TD-LTE technology, random access is the access process of user equipment (UE, UserEquipment) before starting to communicate with the network, and is mainly used for initial access of user equipment, radio resource control (RRC ) connection re-establishment and switching purposes. figure 1 It is a flow chart of the contention random access method in the existing LTE system, which mainly includes 4 steps: [0003] In step 1, the UE sends a random access Preamble code on an uplink random access channel. [0004] Step 2, the base station (eNB) transmits a random access response on the downlink shared channel (DL-SCH). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
Inventor 杨茜朱颖
Owner POTEVIO INFORMATION TECH
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