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Random access method and device

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

Active Publication Date: 2017-08-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
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example 1

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

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

[0141] a) MTC device sends preamble sequence;

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

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

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

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

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

[0147] Case 1: The commu...

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] MTC smart meter reading business can periodically report the meter reading frequency as shown in the following table (Table 1).

[0168]

[0169] Table 1

[0170] Take the MTC smart meter as an example to analyze:

[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 power consumption;

[0173] Step 603: Set the communication period;

[0174] a) The MTC smart meter device informs the base station of the communication cycle 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 receives and saves the received commu...

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Abstract

The invention discloses a random access method, applied to user equipment of machine-type communication (MTC). The method comprises the following steps: after accessing to a cell, negotiating the random access time with a base station; and performing random access on random access resources that are distributed to the equipment by the base station according to the negotiated random access time. According to the random access method disclosed by the invention, the random access performance of MTC can be optimized, the collision probability can be reduced, and the success rate of access can be improved.

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 mobile service range and mobile wireless network coverage provided by mobile operators, as well as the implementation of ubiquitous networks, Machine Type Communication (MTC) has developed rapidly. The number of connected mobile terminal users is expected to 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 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 communication involve various industries. Due to its wide range of business types and huge market demand, machine communication will become an important part of mobile communication services in the future....

Claims

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Application Information

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IPC IPC(8): H04W4/00H04W72/04H04W74/08H04W4/70
CPCH04W4/70H04W72/0446H04W74/085H04W72/20H04W74/08
Inventor 夏树强
Owner ZTE CORP