Relaying operation in 3GPP LTE: challenges and solutions

Hoymann, C.; Chen, Wanshi; Montojo, Juan; Golitschek, A.; Koutsimanis, C.; Shen, Xiaodong

doi:10.1109/mcom.2012.6146495

Cited by 190 publications

(111 citation statements)

References 3 publications

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“…The overhead of the RS and control signals is decreased for a small cell achieving a lean carrier that decreases the amount of interference imparted to the surrounding cells and operational cost. [21], [22], [30] The LTE and LTE-Advanced radio interfaces achieve high user throughput when the received SINR is high. However, when the received signal power level becomes low such as indoors and at the cell edge of a macrocell, the achievable throughput is reduced.…”

Section: Heterogeneous Networkmentioning

confidence: 99%

Radio Access Technologies for Broadband Mobile Communications

Sawahashi

Higuchi

2017

IEICE Trans. Commun.

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Section: Heterogeneous Networkmentioning

confidence: 99%

Radio Access Technologies for Broadband Mobile Communications

Sawahashi

Higuchi

2017

IEICE Trans. Commun.

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“…Relaying is a LPN solution, whereby, compact relay nodes (RNs) are wirelessly self-backhauled via a standardized LTE relay link (Un interface) towards a macro donor eNode B (DeNB) [13]. The relay access links towards the UEs are then based on the conventional LTE Uu air interface.…”

Section: Description and Benefitsmentioning

confidence: 99%

Coordinated multi-point transmission for relaxation of self-backhauling bottlenecks in heterogeneous networks

Haile

Mutafungwa

Hämäläinen

2015

J Wireless Com Network

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The heterogeneous deployment of high-power macro cells and low-power nodes (LPNs) is now widely acknowledged as an essential requirement towards meeting the continued demand for mobile data capacity. The selection of the optimum backhaul solution for the LPNs obliges operators to consider not only the capacity of the backhaul but also other key factors so as to fully leverage the benefits provided by LPNs: the cost of the backhauling may limit the density of LPN deployments and the backhaul configuration requirements impact on the flexibility of LPN deployment. To that end, self-backhauling of LPNs via the existing macro radio access network (RAN) provides an attractive solution, particularly for deployment scenarios that are very cost-sensitive and/or require high flexibility. However, use of self-backhauling usually makes backhaul as a bottleneck due to the a) limited bandwidth allocated for legacy macro RAN, b) the need to share resources with macro user equipment (UE), and c) the high-intercell interference particularly in the macro cell edge. In this paper, we provide an overview of self-backhauled LPNs and investigate possible performance enhancements through the use of coordinated multi-point (CoMP) transmission to relax the downlink backhaul capacity bottleneck for self-backhauled LPNs. To that end, we carry out analytical studies for a practical limited-feedback CoMP technique and numerically verify the derived capacity outage expressions. Furthermore, we implement a simulation study for an exemplary heterogeneous network deployment in a realistic radio propagation environment. The results of the studies demonstrate that significant spectral efficiency and throughput gains for the LPN backhaul are achievable through the use of selected CoMP technique under realizable feedback overhead, even under feedback bit error. The achieved relaxation in the backhaul bottleneck is observed providing improved performance for the UEs served by the LPNs. Furthermore, more resources will be available for macro UEs leading to overall performance gains compared to the case without CoMP.

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“…Relays aid the mobile users by receiving and retransmitting their signals over the wireless backhaul between the relay BS (RBS) and the macrocell BS. However, the performance of relay transmissions is greatly affected by the associated delays in transmission, cascaded channel effects, collaborative strategies and relay selection processes [8]. Relays have a typical transmit power of 1 W -5 W and coverage of few hundred meters.…”

Section: Relay-on-edge (Roe)mentioning

confidence: 99%