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A random access method and device

A random access and random access response technology, applied in the field of communication, can solve the problem of undefined random access methods in scenarios, and achieve the effect of cost saving

Active Publication Date: 2011-12-07
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The random access method for the above scenario is not defined in the current standard

Method used

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  • A random access method and device

Examples

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Embodiment Construction

[0042] In the embodiment of the present invention, in the dedicated search space of the UE, the physical downlink control channel (PDCCH) scrambled by the random access radio network temporary identifier (RA-RNTI) is used to transmit the random access response, and the random access process is realized, which is especially applicable to For SCell, the PDCCH scrambled by RA-RNTI is transmitted in the dedicated search space of the UE, which does not increase the number of blind detections of the PDCCH by the UE, and does not need to transmit a random access response on the PDSCH, which also avoids RA-RNTI scrambling on the SCell. Compared with the transmission of the random access response on the PDSCH scheduled by the RA-RNTI scrambled PDCCH, it saves the overhead of downlink data transmission to a certain extent.

[0043] see Figure 5 , the flow of the random access method on the UE side in this embodiment is as follows:

[0044] Step 501: The UE receives the random access c...

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PUM

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Abstract

The invention discloses a random access method, which is used to realize the random access process, so as to realize the uplink synchronization between the user side and the network side without increasing the blind detection of the PDCCH by the UE. The method includes: the UE receives random access configuration information, and determines, according to the configuration information, a dedicated preamble sequence and dedicated PRACH resources used on a cell that needs to perform random access; The PRACH resource sends the dedicated preamble sequence to the base station; the UE detects the PDCCH scrambled with RA-RNTI in the dedicated search space, and obtains a random access response from the PDCCH, where the random access response at least includes The TA for uplink synchronization adjustment of the cell that has sent the dedicated preamble sequence. The invention also discloses a device for implementing the method.

Description

technical field [0001] The present invention relates to the communication field, in particular to a random access method and device. Background technique [0002] Random access procedure (Random access procedure) is used to establish uplink synchronization between user equipment (UE, User Equipment) and base station (eNB), by using PRACH (Physical Random Access) in the uplink subframe configured in the system for random access Access Channel, physical random access channel) sends a random access preamble (preamble) sequence, and receives a random access response (RAR, Random Access Response) fed back by the base station, to achieve uplink synchronization. The random access process is divided into contention random access and non-contention random access. [0003] Non-competitive random access procedure see figure 1 As shown, it includes: the UE receives the message (Msg0) sent by the eNB for configuring the dedicated preamble and PRACH resources used by the non-contention ...

Claims

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Application Information

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IPC IPC(8): H04W74/08
Inventor 高雪娟林亚男许芳丽沈祖康
Owner DATANG MOBILE COMM EQUIP CO LTD
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