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Random access method and device, storage medium, user equipment, base station

A technology for random access and user equipment, applied in the field of communication, can solve the problems of affecting random access response, lack, etc., and achieve the effect of improving the utilization rate of time-frequency resources and improving the success rate

Active Publication Date: 2021-01-05
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the NR communication system, 3GPP has not yet discussed the time-frequency tracking reference signal (Tracking Reference Signal, TRS) configuration of the user equipment in the idle state, and only configures the TRS in the radio resource control (Radio Resource Control, RRC) connected state , resulting in the lack of reference signals in the NR system to enable the user equipment to perform fine carrier time offset / carrier frequency offset estimation and delay spread / Doppler spread estimation, which affects the random access response (Random Access Response) reception of the idle state user equipment , RAR) success rate

Method used

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  • Random access method and device, storage medium, user equipment, base station
  • Random access method and device, storage medium, user equipment, base station
  • Random access method and device, storage medium, user equipment, base station

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Embodiment Construction

[0050] As described in the Background Art, in an LTE system, a user equipment in an idle state can use CRS to adjust one or more of carrier time offset, carrier frequency offset, delay spread and Doppler spread to ensure the idle state The user equipment can successfully receive downlink information such as broadcast messages / paging messages / random access.

[0051] The carrier time offset (Carrier Time Offset, CFO) is used to represent the time offset of the carrier on the channel; the carrier frequency offset (Carrier Frequency Offset, CFO) is used to represent the frequency offset of the carrier on the channel , the CFO may cause subcarrier crosstalk.

[0052] Regarding the delay extension, since the signal arriving at the receiving end is a composite signal of each signal passing through different paths and having time differences. In the time domain, the synthesized signal will have a delay spread relative to the original signal.

[0053] The Doppler Spread is used to de...

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Abstract

A random access method and device, a storage medium, a piece of user equipment and a base station are provided. The method includes the following steps: when random access based on a competition mechanism is carried out, an uplink preamble is sent to a base station; a PDCCH (Physical Downlink Control Channel) is determined by blind test according to the uplink preamble; a TRS (Tracking Reference Signal) is acquired from a preset time-frequency resource in a time slot where the PDCCH is located; the PDSCH in a preset time slot is compensated according to the TRS and the time slot where the PDCCH is located; and an RAR (Random Access Response) is acquired in the compensated PDSCH. The scheme of the invention can improve the success rate of RAR acquisition by user equipment.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a random access method and device, a storage medium, user equipment, and a base station. Background technique [0002] In the LTE system, the Cell Reference Signal (CRS) is an Always-On (Always-On) signal with a period of 5 milliseconds, even if the user equipment is in an idle state, within a time range of no more than 5 milliseconds CRS is used to adjust one or more of carrier time offset, carrier frequency offset, delay spread and Doppler spread to ensure that the user equipment can successfully receive downlink messages such as broadcast messages / paging messages / random access in idle state information. [0003] However, in the NR communication system, currently 3GPP has not discussed the time-frequency tracking reference signal (TRS) configuration of the user equipment in the idle state, and only configures the TRS in the radio resource control (Radio R...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04W72/04H04W74/00
CPCH04W72/0446H04W74/004H04W74/0833
Inventor 汪绍飞周化雨贾亚男
Owner SPREADTRUM COMM (SHANGHAI) CO LTD