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Method and device for initial access

An initial access and random access technology, applied in the field of communication, can solve the problems that the link is easily blocked by obstacles, the path loss is large, and the link stability is affected, so as to improve the initial access performance and stability , Improve the effect of system user experience

Active Publication Date: 2021-05-07
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under high-frequency conditions, the wireless environment of the system is poor, the path loss is large, and the link is easily blocked by obstacles, which is likely to have a greater impact on the stability of the system link

Method used

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  • Method and device for initial access
  • Method and device for initial access
  • Method and device for initial access

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Embodiment Construction

[0082] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a" and "the" are also intended to include plural forms unless the context clearly dictates otherwise.

[0083]The access network equipment (Access Network Equipment) involved in the embodiment of the present invention is a device deployed in a radio access network to provide a wireless communication function for a user equipment (User Equipment, UE). The access network may include various forms of macro base stations, micro base stations, relay stations, access points and so on. In systems using different wireless access technologies, the name of the device with access network device functions may be different. For example, in an LTE network, it is called an evolved Node B (English: evolved NodeB, eNB or eNod...

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Abstract

Embodiments of the present invention provide a method and device for initial access. The method includes that an access network device uses at least two downlink beams to send a synchronization signal to a user equipment, and the synchronization signal includes downlink beam indexes of at least two downlink beams; then The network access device receives the random access preamble sent by the user equipment; the access network device uses at least two downlink beams to send a random access response RAR message to the user equipment to complete the initial access of the user equipment. Adopting the initial access method provided by the embodiment of the present invention overcomes the shortcoming of channel instability in a high-frequency transmission environment in the new wireless system, thereby improving the initial access performance of the NR system, and further improving system user experience.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for initial access. Background technique [0002] In the traditional Long Term Evolution (LTE) mobile communication system, when the user equipment (UserEquipment) initially accesses the system, it mainly includes: initial synchronization and cell search of the user equipment; access network equipment (Access Network Equipment) sends the basic system The message is a system information block (System information block, SIB) message; the user equipment initiates a random access procedure. [0003] During the initial synchronization and cell search process of the user equipment, the user equipment can obtain downlink coarse time synchronization and coarse frequency synchronization according to the primary synchronization signal (Primary Synchronization Signal, PSS) and secondary synchronization signal (Secondary Synchronization Signal, SSS), and further obtain s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04
CPCH04B7/0408H04W72/04H04W74/0833H04W74/0891H04B7/0695H04W72/0453H04W72/046H04W74/006
Inventor 徐凯庄宏成
Owner HUAWEI TECH CO LTD