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Unlicensed NOMA method for realizing URLLC based on yoke transformation model

A model-changing, authorization-free technology, applied in the direction of network traffic/resource management, transmission system, wireless communication, etc., can solve problems such as the inability to carry URLLC

Active Publication Date: 2020-06-19
JILIN UNIV
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Problems solved by technology

However, the existing NOMA technology cannot achieve 99.999% reliability within milliseconds and cannot carry URLLC

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  • Unlicensed NOMA method for realizing URLLC based on yoke transformation model
  • Unlicensed NOMA method for realizing URLLC based on yoke transformation model
  • Unlicensed NOMA method for realizing URLLC based on yoke transformation model

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Embodiment Construction

[0092] Such as figure 1 As shown, the present invention realizes the authorization-free NOMA method of URLLC based on the martingale transformation model, and specifically includes the following steps:

[0093] Step 1) Estimate the number of active terminals g in the NOMA system based on compressed sensing theory, and calculate the RIP (Restricted Isometry Constants) parameter λ (reference: B.Wang, L.Dai et al. "Dynamic CompressiveSensing-Based Multi-User Detection for Uplink Grant- Free NOMA”, IEEECommun.Lett., vol.20, no.11, pp.2320-2323, Nov.2016); if 0<λ<1, the least mean square serial interference cancellation based on compressive sensing (MMSE -SIC) The multi-user signal detection algorithm estimates the channel matrix, and then decodes the multi-terminal superimposed signal. On the contrary, the basic SIC multi-user detection algorithm is used to solve the superposition signal of multiple terminals (that is, the sum of the data transmitted by each terminal transmitted ...

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Abstract

The invention relates to an authorization-free NOMA method for realizing URLLC based on a yoke transformation model, and the method comprises the following steps: achieving the estimation of the number of active terminals of an NOMA system based on a compressed sensing theory, and decoding a multi-terminal superposed signal; abstracting the interference pattern, solving the signal to interferenceplus noise ratio of the terminal in the transmission state, and solving the MAC-PHY joint reachable transmission rate according to the outage probability distribution; solving the time delay violationprobability of each terminal for a time delay and reliability joint analysis method meeting high reliability and low time delay for the multi-user uplink NOMA system based on a service yoke theory; and the optimal values of the terminal transmitting power and the access probability are solved by taking the maximum system energy efficiency as an optimization target, taking the delay reliability requirement as a constraint and taking the terminal transmitting power and the access probability as optimization variables. According to the invention, the collision problem of multi-user uplink unlicensed scheduling can be alleviated, the strict QoS guarantee of URLLC is realized, and the spectral efficiency and the system energy efficiency are improved.

Description

technical field [0001] The invention relates to an authorization-free non-orthogonal multiple access (NOMA) method for ensuring high reliability and low delay communication (URLLC) based on a martingale transformation model, and belongs to the field of wireless network random access. Background technique [0002] High Reliability and Low Latency Communication (URLLC) is one of the three core application scenarios of 5G, mainly used to carry services such as industrial automation, autonomous driving and telemedicine. These services put forward higher requirements on delay and reliability, and achieve at least 99.999% highly reliable transmission under the delay limit of 1 millisecond. [0003] Considering the short packets and sporadic characteristics of URLLC services, 3GPP proposed in the "TR 38.802V14.2.0" technical report that terminals carrying uplink URLLC services recommend using a grant-free transmission mode. The feature of authorization-free access is that there is...

Claims

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Application Information

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IPC IPC(8): H04B17/309H04B17/382H04W24/02H04W28/02H04W74/08
CPCH04W24/02H04W28/0236H04W28/0268H04W74/0858H04B17/309H04B17/382Y02D30/70
Inventor 迟学芬齐瑞哲赵琳琳
Owner JILIN UNIV
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