Age of Information in SIC-based Non-Orthogonal Multiple Access

Ren, Quanjia; Chan, Tse-Tin; Liang, Jiaxin; Pan, Haoyuan

doi:10.1109/wcnc51071.2022.9771565

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…For example, [34] studied the average AoI in a two-user NOMA network for the first time and showed that NOMA and TDMA outperform each other under different packet arrival rates. Later, [36] specifically investigated the effect of SIC on the average AoI, and [35] further validated the AoI improvement of NOMA over TDMA through experiments on software-defined radios. However, [34]- [36] focused on single-hop networks without relays.…”

Section: B Orthogonal and Non-orthogonal Multiple Accessmentioning

confidence: 99%

“…Later, [36] specifically investigated the effect of SIC on the average AoI, and [35] further validated the AoI improvement of NOMA over TDMA through experiments on software-defined radios. However, [34]- [36] focused on single-hop networks without relays. [37] studied a user-cooperative scenario with more than one hop, where an adaptive NOMA/OMA downlink system was proposed to minimize AoI.…”

Section: B Orthogonal and Non-orthogonal Multiple Accessmentioning

confidence: 99%

“…Most previous NOMA works focused on optimizing conventional metrics such as throughput and delay. Very recently, some works have applied NOMA to improve the average AoI performance [34]- [36]. For example, [34] studied the average AoI in a two-user NOMA network for the first time and showed that NOMA and TDMA outperform each other under different packet arrival rates.…”

Section: B Orthogonal and Non-orthogonal Multiple Accessmentioning

confidence: 99%

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Timely Status Update in Relay-Assisted Cooperative Communications

Pan¹,

Feng²,

Chan³

et al. 2023

Preprint

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We investigate the age of information (AoI) of a relay-assisted cooperative communication system, where a source node sends status update packets to the destination node as timely as possible with the aid of a relay node. For time-slotted systems without relaying, prior works have shown that the source should generate and send a new packet to the destination every time slot to minimize the average AoI, regardless of whether the destination has successfully decoded the packet in the previous slot. However, when a dedicated relay is involved, whether the relay can improve the AoI performance requires an in-depth study. In particular, the packet generation and transmission strategy of the source should be carefully designed to cooperate with the relay. Depending on whether the source and the relay are allowed to transmit simultaneously, two relay-assisted schemes are investigated: time division multiple access (TDMA) and nonorthogonal multiple access (NOMA) schemes. In TDMA, the source generates and sends a new packet every other time slot to avoid possible simultaneous transmission with the relay. In NOMA, the source generates and sends a new packet every time slot, thus possibly forming simultaneous transmission from the relay and the source. A key challenge in deriving their theoretical average AoI is that the destination has different probabilities of successfully receiving an update packet in different time slots. We model each scheme using a Markov chain to derive the corresponding closed-form average AoI. Interestingly, our theoretical analysis indicates that the relay-assisted schemes can only outperform the non-relay scheme in average AoI when the signal-to-noise ratio of the source-destination link is below −2dB. Furthermore, comparing the merits of relay-assisted schemes, simulation results show that the TDMA scheme has a lower energy consumption, while the NOMA counterpart typically achieves a lower average AoI.

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Section: B Orthogonal and Non-orthogonal Multiple Accessmentioning

confidence: 99%

Section: B Orthogonal and Non-orthogonal Multiple Accessmentioning

confidence: 99%

Section: B Orthogonal and Non-orthogonal Multiple Accessmentioning

confidence: 99%

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Timely Status Update in Relay-Assisted Cooperative Communications

Pan¹,

Feng²,

Chan³

et al. 2023

Preprint

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“…The performance of SIC-aided methods has been evaluated in [21], where the author characterizes the evolution and obtains closed forms expressions for the average AoI. Authors in [22] and [23] proposed SIC-aided policies that achieves lower AoI than orthogonal multiple access schemes, while [24] considers an adaptive Non-Orthogonal Multiple Access (NOMA)/OMA aiming at exploring the advantages of both approaches. However, NOMA-based protocols require the individual channel state information knowledge regarding multiple colliding packets, which may be prohibitive to be implemented in practice.…”

Section: A Related Workmentioning

confidence: 99%

Age-of-Information Dependent Random Access in Multiple-Relay Slotted ALOHA

2022

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With the advent and rapidly consolidating of the Internet of Things (IoT), multiple applications arise with different performance requirements, such as the timeliness of information, which can be quantified by the age-of-information (AoI) metric. Furthermore, allowing the coexistence of massive numbers of lowcomplexity IoT devices is often desirable, and modern random access methods have been explored as a way of achieving it. In this paper, we investigate the performance of a random access two-hop network with multiple relays, focusing on the AoI metric. We evaluate the average age of the network under two age-dependent approaches, namely ADRA-MRU, in which users evaluate their age against a threshold before transmitting, and ADRA-MRD, where this responsibility belongs to relays. As a result, we show through analytical and numerical results that ADRA-MRU can considerably reduce the average AoI of an age-independent random access scheme with multiple relays (AIRA-MR) by more than 60%, while the performance of ADRA-MRD is slightly better than that of AIRA-MR. Moreover, we also provide insights on the optimal number of relays as well as other parameters that influence the AoI.

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The role of SIC on the design of next generation multiple access

Razzaque,

Qureshi,

Baiocchi

2023

Ann. Telecommun.

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The interplay of physical layer enhancements and classic random access protocols is the objective of this paper. Successive interference cancellation (SIC) is among the major enhancements of the physical layer. Considering the classic representatives of random access protocols, Slotted ALOHA and Channel Sensing Multiple Access (CSMA), we show that two regimes can be identified as a function of the communication link spectral efficiency. In case of high levels of spectral efficiency, multi-packet reception enabled by SIC is of limited benefit. Sum-rate performance is dominated by the effectiveness of the Medium Access Control (MAC) protocol. On the contrary, for low spectral efficiency levels, sum-rate performance is essentially dependent on physical layer SIC capability, while the MAC protocol has a marginal impact. Limitations due to transmission power dynamic range are shown to induce unfairness among nodes. However, the unfairness issue fades away when the system is driven to work around the sum-rate peak achieved for low spectral efficiency. This can also be confirmed by looking at Age of Information (AoI) metric. The major finding of this work is that SIC can boost performance, while still maintaining a fair sharing of the communication channel among nodes. In this regime, the MAC protocol appears to play a marginal role, while multi-packet reception endowed by SIC is prominent to provide high sum-rate, low energy consumption, and low AoI.

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Age of Information in SIC-based Non-Orthogonal Multiple Access

Cited by 8 publications

References 16 publications

Timely Status Update in Relay-Assisted Cooperative Communications

Timely Status Update in Relay-Assisted Cooperative Communications

Age-of-Information Dependent Random Access in Multiple-Relay Slotted ALOHA

The role of SIC on the design of next generation multiple access

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