ECHO: Enhanced Conditional Handover boosted by Trajectory Prediction

Prado, Anna; Vijayaraghavan, Hansini; Kellerer, Wolfgang

doi:10.1109/globecom46510.2021.9685348

Cited by 11 publications

(2 citation statements)

References 14 publications

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“…A. Prado et al introduced enhanced CHO (ECHO) based on the user's mobility and reserved resources in that trajectory. Then, they developed a sequence to sequence (Seq2Seq) prediction model which reduces handover rate up to 23% , RLFs up to 77% and control messages up to 69% [46]. The simulations of baseline handover proved that CHO decreases the RLF and the system recovery process accelerates reconnections up to 80% despite RLF occurrence [47].…”

Section: Conditional Handovermentioning

confidence: 99%

A survey on the handover management in 5G-NR cellular networks: aspects, approaches and challenges

Haghrah

Abdollahi

Azarhava

et al. 2023

J Wireless Com Network

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With the purpose of providing higher data rate and ultra-reliable and low-latency communications for the users, employing the small cells in the upcoming Fifth-Generation-New Radio (5G-NR) cellular networks and beyond is leading to the serious challenges in mobility management due to dynamicity of the user equipments (UEs). Among different issues related to the mobility of the UEs, the handover management is one of the key procedures to let the UEs experience a high quality of service (QoS)/quality of experience (QoE). So far, many protocols and algorithms have been proposed to enhance the mobility management in 5G-NR from various aspects, but still a thorough survey has not been incorporated to summarize the recent advances and future directions of the mentioned issue. Thus, the handover management and the corresponding challenges stand in the center of concentrations in this paper, with a glance on 4G to the advancements of 5G-NR. The challenges include QoS/QoE, throughput, delay, traffic load, the attacks during authentication process and resource allocation. To overcome the mentioned challenges, the handover procedure is evaluated by some key performance indicators such as handover ratio, handover failure, radio link failure and such like which depend on the received signal quality. The lack of new advancements and novel aspects of handover plus the separation of security and handover issues in previous works are perceived as research gaps and motivations for the current paper. In this regard, this paper aims to specify and analyze the technical issues, to provide an overview on the proposed methods and recent advances and to bring the future directions into the limelight. We categorize the concurrent standards and methods about the handover, and then, we survey the proposed algorithms including theoretical, algorithm-based and pattern-capturing approaches following the authentication process along with the vulnerabilities and the algorithms to counteract the attacks during handover. Also, we study various issues corresponding to network performance during the handover procedure. Finally, we discuss the open problems and future research directions.

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Section: Conditional Handovermentioning

confidence: 99%

A survey on the handover management in 5G-NR cellular networks: aspects, approaches and challenges

Haghrah

Abdollahi

Azarhava

et al. 2023

J Wireless Com Network

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“…For the efficient distribution of resources in the network, it is important that resource reservation time is optimized. It is known from [12], [14], [19] that the resource reservation time in CHO is high since multiple cells reserve resources for a single UE. In [6] it was concluded that in FCHO the resource reservation problem is exacerbated due to the retention of prepared cells after a handover.…”

Section: Introductionmentioning

confidence: 99%

On the Analysis and Optimization of Fast Conditional Handover With Hand Blockage for Mobility

et al. 2023

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Although frequency range 2 (FR2) systems are an essential part of 5G-Advanced and future 3GPP releases, the mobility performance of multi-panel user equipment (MPUE) with hand blockage is still an area open for research and standardization. In this article, a comprehensive study on the mobility performance of MPUE with hand blockage is performed for conditional handover (CHO) and its potential enhancement denoted by fast conditional handover (FCHO). In contrast to CHO, in FCHO the MPUE can reuse earlier target cell preparations after each handover to autonomously execute subsequent handovers. This saves both the signaling overhead associated with the reconfiguration and re-preparation of target cells after each handover and reduces mobility failures. Results have shown that FCHO offers considerable mobility performance gains as compared to CHO for different hand blockage cases that are dependent on the hand position around the MPUE. For the worst-case hand blockage scenario, it is seen that mobility failures reduce by 10.5% and 19.3% for the 60 km/h and 120 km/h mobility scenarios, respectively. This gain comes at the expense of reserving the handover resources of an MPUE for a longer time given that the target cell configurations are not necessarily released after each handover. In this article, the longer resource reservation problem in FCHO is analysed and three different resource reservation optimization techniques are introduced. Results have shown that these optimization techniques not only reduce the resource reservation time but also significantly reduce the signaling overhead at the possible expense of a tolerable degradation in mobility performance.

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