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Random access method and device

A random access and random access process technology, applied in the field of communication, can solve problems such as no response, and achieve the effect of reducing complexity and power consumption

Active Publication Date: 2020-11-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the 2-step RACH process is different from the 4-step RACH process, and how to obtain a response to MsgA in the 2-step RACH has not been given in the prior art

Method used

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Embodiment Construction

[0128] The technical solution in this application will be described below with reference to the accompanying drawings.

[0129] In the present application, the first, second, third and various numbers are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. For example, different messages, different search spaces, different configuration information, different time windows, etc. are distinguished.

[0130] It should also be understood that in the embodiments shown below, "pre-obtaining" may include being instructed by a network device signaling or pre-defined, for example, defined by a protocol. Among them, "pre-defined" can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices). limited.

[0131] It should also be understood that the "storage" mentioned in the embodiment ...

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PUM

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Abstract

The invention provides a random access method and device. The random access method comprises that user equipment sends a random access message of a first type random access process to a network device, wherein the random access message of the first type random access process comprises a random access preamble and uplink data; and the user equipment starts a first time window after the transmissionof the random access preamble is finished, and monitors first downlink control information (DCI) and second DCI in the first time window, wherein the first DCI is used for scheduling a first physicaldownlink shared channel (PDSCH) carrying a first response message for the random access preamble, and the second DCI is used for scheduling a second physical downlink shared channel (PDSCH) carryinga second response message for the random access preamble, wherein the second DCI is used for scheduling a second PDSCH carrying a second response message for the random access message.

Description

technical field [0001] The present application relates to the communication field, and more specifically, to a random access method and device in the communication field. Background technique [0002] With the rapid development of ultra reliable low latency (URLLC) and machine type communication (MTC) and the Internet of things (IoT) in the future, sparse, small-packet and low-latency data Transmission also has more and more application scenarios. In order to satisfy this type of data transmission, a two-step (2-step) random access channel (random access channel, RACH) scheme is proposed. [0003] The main idea of ​​the 2-step RACH scheme is to combine the process of the first step and the third step in the traditional four-step (4-step) RACH into one step, and combine the steps of the second step and the fourth step in the traditional 4-step RACH The process is merged into one step, so that the 2-stepRACH scheme greatly accelerates the process of random access. A 2-step ...

Claims

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Application Information

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IPC IPC(8): H04W74/00H04W74/08
CPCH04W74/006H04W74/0833H04W28/0268H04L5/0091H04L5/0082H04L5/0048H04L5/0044H04L5/0053H04L5/0023H04L27/2647H04W72/23
Inventor 吴艺群行双双王轶
Owner HUAWEI TECH CO LTD