The Experts below are selected from a list of 6831 Experts worldwide ranked by ideXlab platform
Indra Widjaja - One of the best experts on this subject based on the ideXlab platform.
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sizing x2 bandwidth for inter connected Enbs
Vehicular Technology Conference, 2009Co-Authors: Indra WidjajaAbstract:LTE is a next-generation wireless network technol- ogy being developed by 3GPP. One unique aspect of LTE is that neighboring Enbs can be directly interconnected through X2 interface to facilitate direct exchange of control messages and to forward user data during handover. In this paper, we investigate the X2 bandwidth requirement for both control-plane traffic and user-plane traffic. We first consider the case where individual UEs cross cell boundaries independently. We then extend to the case where groups of UEs may cross cell boundaries simultaneously. In both cases, we analyze the bandwidth needed on the X2 interface to meet a certain performance objective. Our results generally indicate that the X2 bandwidth requirement is very small compared to S1-U bandwidth. However, the X2 bandwidth requirement may potentially increase significantly when groups of UEs perform handover simultaneously.
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VTC Fall - Sizing X2 Bandwidth for Inter-Connected Enbs
2009 IEEE 70th Vehicular Technology Conference Fall, 2009Co-Authors: Indra WidjajaAbstract:LTE is a next-generation wireless network technol- ogy being developed by 3GPP. One unique aspect of LTE is that neighboring Enbs can be directly interconnected through X2 interface to facilitate direct exchange of control messages and to forward user data during handover. In this paper, we investigate the X2 bandwidth requirement for both control-plane traffic and user-plane traffic. We first consider the case where individual UEs cross cell boundaries independently. We then extend to the case where groups of UEs may cross cell boundaries simultaneously. In both cases, we analyze the bandwidth needed on the X2 interface to meet a certain performance objective. Our results generally indicate that the X2 bandwidth requirement is very small compared to S1-U bandwidth. However, the X2 bandwidth requirement may potentially increase significantly when groups of UEs perform handover simultaneously.
Haysam Alradwan - One of the best experts on this subject based on the ideXlab platform.
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The Effects of Tilting Antennae on Ping-Pong Handover in Inter Enbs Handover
International Journal of Research, 2012Co-Authors: Kinan Ghanem, Haysam AlradwanAbstract:The handover (HO) procedure in LTE belongs to break-before-make type of handover; which can increase the probability of ping-pong HO. One of the most crucial problems in LTE is the ping-pong type of movement; it can reduce the handover performance. The aim of this work is to study the effects of tilting antennae on ping-pong HO in LTE networks. The impact of tilting antennae on the overlapping areas between the neighboring Enbs in LTE networks has also been investigated. The analysis shows that tilting the Enbs antennae can reduce the number of ping-pong HOs and reduce the probability of dropped and blocked occurring. Our simulation recommends that the optimal up/down-tilting antennae angles that achieve the best value of the KPIs are 1 to 3 degrees.
Wentsuen Chen - One of the best experts on this subject based on the ideXlab platform.
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an enhanced handover scheme for mobile relays in lte a high speed rail networks
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Mengshiuan Pan, Tzuming Lin, Wentsuen ChenAbstract:Recently, the mobile relay technique has been discussed to support communication services for Long-Term Evolution Advanced (LTE-A) high-speed rail networks. In the network, there are several mobile relays in a train. User equipment (UE) devices connect to in-car mobile relays instead of outside evolved NodeBs (Enbs). Mobile relays establish backhaul links with the serving donor Enbs (DEnbs) and coordinate control and data flows for UE devices. Since the train travels in high speed, mobile relays suffer from frequent handovers between DEnbs. We observe that the defined handover procedures in LTE-A specifications may incur message overhead and lengthen handover time. In this paper, we propose an enhanced handover scheme, which contains two procedures. The first procedure is an enhanced measurement procedure, which can accelerate the measurement procedure when the mobile relay knows that the train is moving toward some neighbor DEnbs. The second procedure is a group in-network handover procedure, which can aggregate similar in network handover procedures in the core network. Performance evaluations indicate that our design can conserve both time and messages when handover.
Kinan Ghanem - One of the best experts on this subject based on the ideXlab platform.
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The Effects of Tilting Antennae on Ping-Pong Handover in Inter Enbs Handover
International Journal of Research, 2012Co-Authors: Kinan Ghanem, Haysam AlradwanAbstract:The handover (HO) procedure in LTE belongs to break-before-make type of handover; which can increase the probability of ping-pong HO. One of the most crucial problems in LTE is the ping-pong type of movement; it can reduce the handover performance. The aim of this work is to study the effects of tilting antennae on ping-pong HO in LTE networks. The impact of tilting antennae on the overlapping areas between the neighboring Enbs in LTE networks has also been investigated. The analysis shows that tilting the Enbs antennae can reduce the number of ping-pong HOs and reduce the probability of dropped and blocked occurring. Our simulation recommends that the optimal up/down-tilting antennae angles that achieve the best value of the KPIs are 1 to 3 degrees.
Mengshiuan Pan - One of the best experts on this subject based on the ideXlab platform.
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an enhanced handover scheme for mobile relays in lte a high speed rail networks
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Mengshiuan Pan, Tzuming Lin, Wentsuen ChenAbstract:Recently, the mobile relay technique has been discussed to support communication services for Long-Term Evolution Advanced (LTE-A) high-speed rail networks. In the network, there are several mobile relays in a train. User equipment (UE) devices connect to in-car mobile relays instead of outside evolved NodeBs (Enbs). Mobile relays establish backhaul links with the serving donor Enbs (DEnbs) and coordinate control and data flows for UE devices. Since the train travels in high speed, mobile relays suffer from frequent handovers between DEnbs. We observe that the defined handover procedures in LTE-A specifications may incur message overhead and lengthen handover time. In this paper, we propose an enhanced handover scheme, which contains two procedures. The first procedure is an enhanced measurement procedure, which can accelerate the measurement procedure when the mobile relay knows that the train is moving toward some neighbor DEnbs. The second procedure is a group in-network handover procedure, which can aggregate similar in network handover procedures in the core network. Performance evaluations indicate that our design can conserve both time and messages when handover.