Low Latency Random Access for Small Cell Toward Future Cellular Networks

Kim, Sundo; Kim, Seongwon; Kim, Junseok; Lee, Kitaek; Choi, Sunghyun; Shim, Byonghyo

doi:10.1109/access.2019.2958991

Cited by 10 publications

(12 citation statements)

References 23 publications

(29 reference statements)

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“…We also validate our analysis with simulation studies. We also compare our results with existing work on 2-way RAP [11].…”

mentioning

confidence: 88%

“…However, the proposed scheduled allocation approach would not benefit the sporadic RAP requests from broadband users. We would specifically like to mention work in [11] as it considers only two way communication between BS at UE instead of four way to address URLLC applications in ultra dense future networks. The authors in [11] advocate that the reduction of control plane latency, caused by the random access to set up for an RRC connection.…”

Section: Related Workmentioning

confidence: 99%

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Two Step Random Access Latency Improvement in Congested beyond 5G Networks

2020

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It has been recently proposed to enhance the performance of random access procedure (RAP) by downsizing the current four step RAP (4s-RAP) to two step RAP (2s-RAP) in order to address ultra reliable low latency communications (URLLC) in 5G and beyond 5G wireless networks. 2s-RAP reduces latency and signaling overhead by manifesting only one round trip between gNB (5G base station) and the UE (user equipment). However, the low latency goal of 2s-RAP is challenged by the increase in the number of UEs in the future wireless networks. Numerous UEs competing for limited random access resources would result in frequent collisions followed by multiple random access reattempts, resulting in increased delay. In this paper, we propose novel algorithms to improve the performance of 2s-RAP in a congested environment. In the proposed algorithms, the UEs can perform RAP reattempts in either 2s-RAP or 4s-RAP based on the channel conditions such that the chances of RAP failure due to poor channels are reduced. They can also transit to 4s-RAP from the initially selected 2s-RAP in order to alleviate the congestion in 2s-RAP. The proposed algorithms are probabilistically analyzed based on collision probabilities and success rates. We employ our derived mathematical equations, as well as carry out simulation evaluations, to present the performance results effectively.

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“…We also validate our analysis with simulation studies. We also compare our results with existing work on 2-way RAP [11].…”

mentioning

confidence: 88%

Section: Related Workmentioning

confidence: 99%

Two Step Random Access Latency Improvement in Congested beyond 5G Networks

2020

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“…There have been some studies on RA [12]- [19]. The works in [12] and [13] focus on designing a new structure of pream-ble to mitigate the collision problem.…”

Section: Introductionmentioning

confidence: 99%

“…There have been some studies on RA [12]- [19]. The works in [12] and [13] focus on designing a new structure of pream-ble to mitigate the collision problem. In [14], the authors apply code domain Non-orthogonal Multiple Access (NOMA) scheme to RA procedure to improve its performance.…”

Section: Introductionmentioning

confidence: 99%

Random Power Back-Off for Random Access in 5G Networks

2021

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In the massive Machine Type Communications (mMTC) scenario of the 5G network, a huge number of devices communicate with each other. The massive access requests will cause frequent access collisions, which will reduce the efficiency of Random Access (RA) procedure. In this paper, we propose the random power back-off scheme that utilizes power domain Non-orthogonal Multiple Access (NOMA) scheme to solve the RA collision problem in 5G networks. In the proposed method, we attempt to mitigate the RA conflict situation when devices send the same preamble even if the Base Station (BS) does not detect the preamble collision. The proposed method is shown to improve the RA efficiency and average delay.INDEX TERMS 5G, random access, non-orthogonal multiple access (NOMA), power back-off.

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“…In [10], the authors proposed three RA enhancements based on the EDT to reduce the collision probability, which include Parallel Preamble Transmissions, Enhanced Back-off, and Dynamic Reserved Preambles. In [11], the authors proposed a new preamble structure supporting the 2-step B RA scheme, where the uplink data indication and the buffer status are combined with the preamble.…”

Section: Introductionmentioning

confidence: 99%

Analyzing Novel Grant-Based and Grant-Free Access Schemes for Small Data Transmission

Zhou,

Deng,

Feltrin

et al. 2021

Preprint

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The Fifth Generation (5G) New Radio (NR) does not support data transmission during the random access (RA) procedures, which results in unnecessary control signalling overhead and power consumption, especially for small data transmission. Motivated by this, we propose two new RA schemes based on the existing grant-based (4-step) and grant-free (2-step B) RA schemes, which are NR Early Data Transmission (NR EDT) and 2-step A RA schemes, with the aim to enable data transmission during RA procedures in Radio Resource Control (RRC) Inactive state. To compare our proposed schemes with the benchmark schemes, we provide a spatio-temporal analytical framework to evaluate the RA schemes, which jointly models the preamble detection, Physical Uplink Shared Channel (PUSCH) decoding, and data transmission procedures. Based on this analytical model, we derive the analytical expressions for the overall packet transmission success probability of four RA schemes in each time slot. We also derive the throughput and the average energy consumption for a successful packet transmission of each scheme. Our results show that the 2-step A and 2-step B RA schemes provide the highest overall packet transmission success probability, the 2-step A RA scheme provides the lowest average energy consumption in low device intensity scenario, and 2-step B RA provides the lowest average energy consumption in high device intensity scenario.

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Low Latency Random Access for Small Cell Toward Future Cellular Networks

Cited by 10 publications

References 23 publications

Two Step Random Access Latency Improvement in Congested beyond 5G Networks

Two Step Random Access Latency Improvement in Congested beyond 5G Networks

Random Power Back-Off for Random Access in 5G Networks

Analyzing Novel Grant-Based and Grant-Free Access Schemes for Small Data Transmission

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