Improved performance for a heterogeneous satellite-cooperative network with best relay node selection

Hajipour, Pedram; Shahzadi, Ali; Ghazi‐Maghrebi, Saeed

doi:10.23919/j.cc.2019.05.008

Cited by 9 publications

(3 citation statements)

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“…, α Ψ(u K ) ) at the relay. The first constraint in ( 8) makes sure that every scheduled user satisfies the rate constraint R target , the second constraint in ( 9) is the power constraint at the relay to make sure the total transmission power at the relay is P 2 , and the third constraint in (10) guarantees that the decoding order at the relay: u 1 → u 2 → . .…”

Section: B Maximize Instantaneous Achievable Sum Rate Via An Optimiza...mentioning

confidence: 99%

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Efficient User Scheduling for Uplink Hybrid Satellite-Terrestrial Communication

Zhu

Bai

Zhou

et al. 2023

IEEE Trans. Wireless Commun.

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Due to increasing demands of seamless connection and massive information exchange across the world, the integrated satellite-terrestrial communication systems develop rapidly. To shed lights on the design of this system, we consider an uplink communication model consisting of a single satellite, a single terrestrial station and multiple ground users. The terrestrial station uses decode-and-forward (DF) to facilitate the communication between ground users and the satellite. The channel between the satellite and the terrestrial station is assumed to be a quasi-static shadowed Rician fading channel, while the channels between the terrestrial station and ground users are assumed to experience independent quasistatic Rayleigh fading. We consider two cases of channel state information (CSI) availability. When instantaneous CSI is available, we derive the instantaneous achievable sum rate of all ground users and formulate an optimization problem to maximize the sum rate. When only channel distribution information (CDI) is available, we derive a closed-form expression for the outage probability and formulate another optimization problem to minimize the outage probability. Both optimization problems correspond to scheduling algorithms for ground users. For both cases, we propose low-complexity user scheduling algorithms and demonstrate the efficiency of our scheduling algorithms via numerical simulations.

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Section: B Maximize Instantaneous Achievable Sum Rate Via An Optimiza...mentioning

confidence: 99%

“…For a hybrid satellite-terrestrial system, the performance is strongly related to the design of multiuser access schemes [8], relay selection methods [9] and power allocation strategies [10].…”

Section: Introductionmentioning

confidence: 99%

Efficient User Scheduling for Uplink Hybrid Satellite-Terrestrial Communication

Zhu

Bai

Zhou

et al. 2023

IEEE Trans. Wireless Commun.

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“…For instance, when the ground-based communication infrastructure is destroyed by the natural disaster, UAVs can be used to establish temporary communication links to support rescue operations.It can be seen that connectivity issue is a major concern for ensuring that users have reliable communication links. Users that are unable to contact directly can still establish connections by forwarding messages owing to the communication relay [6][7][8][9]. Direct communication is actually prevented by a wide range of barriers, including over-thehorizon communication that occurs outside the connection range, link interruption due to interference in complex situations, incompatible communication systems that prevent direct communication between heterogeneous users, and so on.…”

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confidence: 99%

Multi-UAV Relay Connectivity Optimization for Heterogeneous Users Based on Load Balancing and Throughput Maximization

Pan

2023

IEEE Access

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By relaying messages between users, unmanned aerial vehicles (UAVs), which are frequently utilized in the communication industry, can be used as airborne communication relays to resolve connectivity problems. In order to effectively connect a large number of heterogeneous users dispersed on the ground, we deploy a large number of UAVs for reliable relay coverage and message transmission between users. We initially put forth a relay coverage algorithm that continuously optimizes the position of UAVs and the cell division of terrestrial users in order to provide users with full coverage. Second, we study several relay message forwarding methods between UAVs while taking into account the features of heterogeneous users. A relay selection method, which takes the relay link throughput as the optimization goal, is proposed to ensure full connectivity between UAVs. Finally, we contrast and analyze how various relay forwarding methods affect the effectiveness of the relay network. The experimental results demonstrate that the proposed relay coverage algorithm can balance the UAV relay load better and reduce transmission delay, while the suggested relay selection strategy can minimize the number of isolated UAVs and maximize the throughput of UAV relay links.INDEX TERMS UAV, relay connectivity, heterogeneous users, relay message forwarding, load balancing, throughput. I. INTRODUCTIONDue to their low cost and flexible deployment, UAVs [1,2] have found extensive usage in the military, civil, and commercial fields for operations like swarm operation [3], emergency rescue [4], and security [5]. For instance, when the ground-based communication infrastructure is destroyed by the natural disaster, UAVs can be used to establish temporary communication links to support rescue operations.It can be seen that connectivity issue is a major concern for ensuring that users have reliable communication links. Users that are unable to contact directly can still establish connections by forwarding messages owing to the communication relay [6][7][8][9]. Direct communication is actually prevented by a wide range of barriers, including over-thehorizon communication that occurs outside the connection range, link interruption due to interference in complex situations, incompatible communication systems that prevent direct communication between heterogeneous users, and so on. The communication relay technology [10][11][12] can offer effective answers to these problems. From the perspective of the causes behind the requirement for relaying, it can be said that communication relay technology addresses two main connectivity issues: the first is the connectivity issue of overthe-horizon communication, and the second is the connectivity issue of incompatible communication systems.Owing to the unique advantages, UAVs are frequently utilized as airborne base stations and aerial relays in the communication field to establish wide-area coverage connection, giving users access to reliable, timely, and ondemand communication services [13][14][15][16][17]. ...

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