US 10,945,292 B2Granted

Random access method and device

AssigneeHuawei Technologies Co., Ltd.

InventorsXiaohu You, Mao Wang, Yalin Liu, Jun Zhang, Min Hua, Junping Sun

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Abstract

A random access method and a device are provided, to enable a device in the Internet of Things to implement random access. The method includes: selecting, by a terminal from at least two frequencies, frequencies used to send a physical random access channel PRACH signal, as frequencies occupied by target PRACH resources, where the at least two frequencies each have a preset bandwidth, and there is no intersection between frequency bands of the at least two frequencies; generating, by the terminal, a target PRACH signal based on the frequencies occupied by the target PRACH resources, a root allocated by a base station, and a cyclic shift corresponding to the root allocated by the base station; and sending, by the terminal, the target PRACH signal to the base station on the target PRACH resources.

Claims24

Dependent claims

A random access method, comprising:

selecting, by a terminal from at least two frequencies, frequencies used to send a physical random access channel (PRACH) signal, as frequencies occupied by target PRACH resources, wherein the at least two frequencies each have a preset bandwidth, and there is no intersection between frequency bands of the at least two frequencies;
generating, by the terminal, a target PRACH signal based on the frequencies occupied by the target PRACH resources, a root allocated by a base station, and a cyclic shift corresponding to the root allocated by the base station including obtaining reference signal received power (RSRP) of a signal from the base station, and, when the RSRP is greater or less than or equal to a preset threshold, generating the target PRACH signal based on the frequencies occupied by the target PRACH resources, the cyclic shift corresponding to the root allocated by the base station, the cyclic shift used to indicate that the RSRP is greater or less than or equal to the preset threshold;
and
sending, by the terminal, the target PRACH signal to the base station on the target PRACH resources.

1 more element

A random access method, comprising:

receiving, by a base station, a target physical random access channel (PRACH) signal sent by a terminal;
when a cyclic shift corresponding to the target PRACH signal is a first cyclic shift, determining that a quantity of PDCCH resources allocated to the terminal is a first quantity, wherein the first cyclic shift is used to indicate that a reference signal received power (RSRP) of a signal obtained by the terminal from the base station is greater than a preset threshold;
or when the cyclic shift corresponding to the target PRACH signal is a second cyclic shift, determining that the quantity of PDCCH resources allocated to the terminal is a second quantity, wherein the second cyclic shift is used to indicate that the RSRP is less than or equal to the preset threshold, the second quantity is greater than the first quantity, and the first cyclic shift and the second cyclic shift are corresponding to a same root.

A base station, comprising a processor, a transceiver and a non-transitory computer-readable medium having instructions stored therein, which when executed by the processor, cause the processor to perform operations comprising:

receiving, by using the transceiver, a target physical random access channel PRACH signal sent by a terminal;
when a cyclic shift corresponding to the target PRACH signal is a first cyclic shift, determining that a quantity of PDCCH resources allocated to the terminal is a first quantity, wherein the first cyclic shift is used to indicate that reference signal received power RSRP of a signal obtained by the terminal from the base station is greater than a preset threshold;
or when the cyclic shift corresponding to the target PRACH signal is a second cyclic shift, determining that the quantity of PDCCH resources allocated to the terminal is a second quantity, wherein the second cyclic shift is used to indicate that the RSRP is less than or equal to the preset threshold, the second quantity is greater than the first quantity, and the first cyclic shift and the second cyclic shift are corresponding to a same root.

Dependencies are inferred from the claim text.

Facts

Application: 16/446,391Filed 19 Jun 2019 · continuation
Priority: CN 201611187162.620 Dec 2016
Published: US 2019/0306894 A13 Oct 2019
Granted: 9 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04W 72/0453
Based on the type of the allocated resource: resources in frequency domain, e.g. a carrier in FDMA
H04W 74/004
Transmission of channel access control information: in the uplink, i.e. towards network
H04W 72/02
Local resource management: selection of wireless resources by user or terminal
H04W 72/04
Local resource management: wireless resource allocation