Cloud RAN challenges and solutions

Agrawal, Rajeev; Bedekar, Anand; Kolding, Troels; Ram, Vishnu

doi:10.1007/s12243-017-0584-5

Cited by 12 publications

(12 citation statements)

References 10 publications

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“…The MAC scheduler is responsible for routing data in the network. The MAC scheduler must execute a certain set of actions every Transmission Time Interval (TTI), this requires very low latency and execution jitter [19]. The MAC instructs the RLC in the size of packets it shall receive and thereby assuring a specific Quality of Service (QoS) for each radio bearer [18].…”

Section: B the Data Link Layermentioning

confidence: 99%

“…This split has been known for several years and the literature in this area is very comprehensive. Therefore, several directions within using this split is investigated focusing on the CPRI transport interface: both the traditional CPRI transport, the option of transporting CPRI over the Ethernet network and the option of compressing [4], [5], [12], [19], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47], [48], [49], [50], [51], [52] Simulations: [53], [54], [55], [56], [57], [58], [59], [60], [61], [62], [63], [64] Practical experiments: [65], [66],…”

Section: B Option 8: Rf/phymentioning

confidence: 99%

“…[12] considers the challenge of the fronthaul bitrate being constant and increasing by the number of antennas, and fixed CU/DU mapping. [19], [28] consider the latency, jitter and fronthaul capacity as challenges for split option 8, and further addresses the scalability issues for 5G. Scalability issues for 5G are also considered for split option 8 in [26].…”

Section: ) Traditional Cpri Transportmentioning

confidence: 99%

“…The exact location of this split is under discussion by 3GPP in [82]. Theoretical surveys: [5], [19], [25], [26], [28], [31], [32], [38], [41], [42], [43], [44], [45], [49] Simulations: [53], [61], [75], [83] Practical experiments: [50], [84], [85] In this split, the precoding and resource element mapper are included in the DU. The fronthaul link transports subframe symbols.…”

Section: Option 7-2: Low Phy/high Phymentioning

confidence: 99%

“…The theoretical survey in [19] addresses the limitations in the lower layer splits induced by the HARQ process in the MAC layer affecting the maximum latency and thereby also the distance between CU and DU. [28] states the variable fronthaul load for this functional split and a potentially relaxed synchronization as huge benefits on the other hand the latency constraints are a challenge.…”

Section: Option 7-2: Low Phy/high Phymentioning

confidence: 99%

See 4 more Smart Citations

A Survey of the Functional Splits Proposed for 5G Mobile Crosshaul Networks

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Christiansen

2019

IEEE Commun. Surv. Tutorials

337

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Pacing the way towards 5G has lead researchers and industry in the direction of centralized processing known from Cloud-Radio Access Networks (C-RAN). In C-RAN research, a variety of different functional splits is presented by different names and focusing on different directions. The functional split determines how many Base Station (BS) functions to leave locally, close to the user, with the benefit of relaxing fronthaul network bitrate and delay requirements, and how many functions to centralize with the possibility of achieving greater processing benefits. This work presents for the first time a comprehensive overview systematizing the different work directions for both research and industry, while providing a detailed description of each functional split option and an assessment of the advantages and disadvantages. This work gives an overview of where the most effort has been directed in terms of functional splits, and where there is room for further studies. The standardization currently taking place is also considered and mapped into the research directions. It is investigated how the fronthaul network will be affected by the choice of functional split, both in terms of bitrates and latency, and as the different functional splits provide different advantages and disadvantages, the option of flexible functional splits is also looked into.

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Section: B the Data Link Layermentioning

confidence: 99%