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Hybrid random access method for m2m communication in LTE network

A technology of physical random access and random selection, applied in the field of communication, can solve the problems of complex receiver and immature power multiplexing technology, and achieve increased user access throughput, save PUSCH resource blocks, and improve access throughput. Effect

Active Publication Date: 2021-03-23
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the realization of the NOMA scheme still faces some difficulties: firstly, the non-orthogonal transmission receiver is quite complex, and the design of a SIC receiver that meets the requirements still depends on the improvement of the signal processing chip technology, and the related receiver processing algorithm needs to be improved. further research; secondly, the power multiplexing technology is not very mature, and there is still a lot of work to be done

Method used

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  • Hybrid random access method for m2m communication in LTE network
  • Hybrid random access method for m2m communication in LTE network
  • Hybrid random access method for m2m communication in LTE network

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Experimental program
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Embodiment 1

[0027] The traditional ALOHA scheme has the disadvantages of being prone to collisions, low channel resource utilization, low system throughput, and sharp drop in system performance when a large amount of data is exchanged, and is not suitable for random access scenarios of large-scale MTC devices; In the access scheme, each level adopts an orthogonal random access method, and the spectrum efficiency and access throughput are not high.

[0028] After research, the present invention proposes a hybrid random access method for M2M communication in an LTE network, that is, a hybrid ORA and NORA method, see the attached figure 1 And attached figure 2 , including the following steps:

[0029] (1) Machine Type Communication (MTC) devices transmit their preambles on the extended Physical Random Access Channel (PRACH): Before starting the random access procedure, the present invention first checks the active MTC by Access Class Control (ACB) The device is divided into master device ...

Embodiment 2

[0042] The hybrid ORA and NORA method used for M2M communication in the LTE network is the same as that in Embodiment 1, the machine type communication (MTC) device described in step 1 transmits its preamble on the extended physical random access channel (PRACH), specifically including There are the following steps:

[0043] (1a) ACB check: When an active MTC device starts to perform random access, it first randomly selects a random number p between [0,1], and then compares it with the ACB check parameter b. If p ACB inspection. Two ACB checks parameters b and Both are obtained by the active MTC device from the system broadcast information broadcast on the physical broadcast channel.

[0044] (1b) Preamble classification: In the stage of preamble transmission to the base station, one of the m available preambles is randomly selected as a special preamble, and the remaining m-1 preambles are used as ordinary preambles. When the present invention is implemented, the situation...

Embodiment 3

[0049]The hybrid ORA and NORA method used for M2M communication in LTE network is the same as embodiment 1-2, the extended physical random access channel (PRACH) described in step (1d), the prior art usually assumes that PRACH occupies 6 scheduling resources block (RB) to send the preamble, the present invention has designed the extended PRACH, and its structure is, each extended PRACH takes 7 RBs to send the preamble and the ID information of the active MTC device, and these 7 RBs include 6 PRACHs RB and 1 PUSCH RB, this PUSCH RB that the present invention increases is used for sending the ID message of active MTC equipment, so that base station can efficiently and quickly detect the equipment that sends preamble, reduces the time consumption of random access procedure, helps To improve user access throughput.

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Abstract

The invention discloses a hybrid random access method for M2M communication in an LTE network, which solves the problems of low data transmission time efficiency, low resource utilization rate and lowthroughput faced by the prior wireless terminal data transmission method under a large-scale Internet of Things application scenario. The method comprises the following steps: a machine-type communication device transmits a preamble of the machine-type communication device on an extended physical random access channel; the machine-type communication device transmits a preamble of the machine-typecommunication device on the extended physical random access channel. The base station detects the type of the equipment, allocates the physical uplink shared channel for the equipment according to the type, and sends a random access response message to the equipment; The main equipment and auxiliary equipment adopt NORA and ORA methods to transmit data message respectively. The base station decodes the data message and sends a contention resolution message. The invention corresponds to the positioning of higher spectrum efficiency, faster speed and larger capacity of 5G wireless network, andmeets the requirement that the spectrum efficiency of 5G needs to be improved by 5 to 15 times compared with 4G, the user access throughput is significantly increased, and the number of access time slots required is less.

Description

technical field [0001] The present invention belongs to the technical field of communication, and further relates to a random access method for M2M communication in the technical field of wireless communication, in particular to a hybrid random access method for M2M communication in an LTE network. Background technique [0002] In wireless communication, the random access process refers to the process from when the user sends a random access preamble and begins to try to access the network to the establishment of a basic signaling connection with the network. It is the establishment of a wireless link between the user and the network. The initial necessary process. Only after the random access is completed, the base station and the user can normally perform data interoperability, so it is a basic and important process in the LTE system. The purpose of random access is to establish uplink synchronization, establish a unique terminal identifier C-RNTI, and request the network...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/70H04W72/04H04W74/08
CPCH04W72/0446H04W74/0833H04W4/70
Inventor 李颖冉婧张茗嵎
Owner XIDIAN UNIV
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