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A random access method and device

A technology of random access and cell access, applied in the field of communication, can solve problems such as high collision probability, limited resources, and low access success rate, and achieve the effects of avoiding collisions, reducing resource waste, and improving utilization

Active Publication Date: 2021-11-09
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (2) PDCCH (Physical Downlink Control Channel, physical downlink control channel) resources are limited
[0009] When a large number of machine-type communication devices initiate random access at the same time, LTE random access resources are limited, which will cause a large number of preamble sequences to collide, with a high collision probability and a low access success rate. extend

Method used

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  • A random access method and device
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  • A random access method and device

Examples

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example 1

[0139] like Figure 5 As shown, the embodiment of the present invention provides an LTE-based machine type communication random access optimization method, including the following steps:

[0140] Step S501: The machine type communication device accesses the cell for the first time, and LTE contention-based random access is used for the first access, such as Image 6 As shown, it can be divided into the following four steps:

[0141] a) The MTC device sends a preamble;

[0142] b) After receiving the preamble sequence sent by the MTC device, the base station sends a random access response RAR (RandomAccess Response) to the MTC device;

[0143] c) The MTC device sends a message three Msg3 to the base station after receiving the RAR;

[0144] d) After receiving Msg3, the base station sends conflict resolution information to the MTC device;

[0145] Step S502: the MTC device sends data;

[0146] Step S503: Setting the communication period may include the following steps:

[...

example 2

[0166]The method of the present invention will be described below by taking the MTC smart meter reading service as an example.

[0167] The MTC smart meter reading service can be reported periodically at the frequency of meter reading shown in the following table (Table 1).

[0168]

[0169] Table 1

[0170] Take the MTC smart meter as an example for analysis:

[0171] Step 601: The MTC smart meter device accesses the cell for the first time, and uses a contention-based random access process to access;

[0172] Step 602: The MTC smart meter device sends data to the base station and reports the power consumption;

[0173] Step 603: Set the communication cycle;

[0174] a) The MTC smart meter device informs the base station of the communication period of the MTC smart meter device;

[0175] Among them, the communication cycle of the MTC smart meter device is 1 hour, that is, the MTC smart meter device reports the power consumption every hour;

[0176] b) The base station...

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Abstract

The invention discloses a random access method, which is applied to machine type communication (MTC) user equipment. The method includes: after accessing a cell, negotiating a random access time with a base station; Random access is performed on the random access resource. The invention can optimize the random access performance of the machine type communication, reduce the collision probability and improve the access success rate.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a random access method and device. Background technique [0002] With the continuous expansion of the range of mobile services provided by mobile operators and the coverage of mobile wireless networks, and the implementation of ubiquitous networks, Machine Type Communication (MTC) has developed rapidly. It is estimated that the number of connected mobile terminal users will increase to about 50 billion in 2020, and a large part of the increase is due to the introduction of a large number of MTC devices. Machine-type communication has a wide range of potential application scenarios, and it is also the support of the Internet of Things and smart cities. The application scenarios of machine-type communication involve various industries. Due to its wide range of business types and its huge market demand, machine-type communication will become an important part of mobi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/70H04W72/04H04W74/08
CPCH04W4/70H04W72/0446H04W74/085H04W72/20H04W74/08
Inventor 夏树强
Owner ZTE CORP
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