Handover

About: Handover is a research topic. Over the lifetime, 24219 publications have been published within this topic receiving 296416 citations. The topic is also known as: handoff.

Methods and Systems for Handover Process in Wireless Communication Networks

Abstract: A method for performing a handover process in a wireless communication system, the method comprising allocating a communication channel to a first infrastructure station in the wireless communication system, reserving a signature corresponding to the communication channel for the first infrastructure station, the signature enabling a user equipment attached to the first infrastructure station to communicate with a second infrastructure station in the wireless communication system over the communication channel, receiving from the user equipment a message including the signature over the communication channel, determining a timing advance as an offset to a delay of the message, and sending the timing advance to the user equipment through the first infrastructure station.

Handover optimization in a wireless network

Abstract: Various embodiments are disclosed relating to the optimization of handovers and ranging in a wireless network. According to an example embodiment, an information request may be received (410), which may include a handover information request, such as a ranging request for handover (412). Resources for handover information requests may be allocated or applied at a higher priority level than at least some non-handover information requests (430). Further, a mobile station may perform ranging (510) with a base station, wherein a first value of a retransmission timer at the mobile station is used for non-handover ranging, and a second value of the retransmission timer that is less than the first value is used for handover ranging. Further, a ranging request message including a ranging purpose indication (520) indicating a ranging purpose may be received. Resources for processing the ranging request message may be allocated at a priority level based on the ranging purpose indication.

Advanced handover schemes in IMT-advanced systems [WiMAX/LTE Update]

Abstract: Handover is one of the key components in cellular network mobility management and has the most stringent latency requirement on service interruption time since the end-user experience is majorly determined by it In the design of IMT-Advanced systems, the scalability and flexibility to support various 4G deployments is also very crucial while meeting the latency requirement on handover This article presents the state-of-the-art handover schemes considering various deployment scenarios in IMTAdvanced candidate systems with a focus on IEEE 80216m based next-generation WiMAX networks and 3GPP LTE-Advanced Also, to minimize and optimize handover latency to fulfill the requirement for quality of service during handover, various procedural advanced handover schemes are being developed, proposed, and analyzed by IEEE 80216m and 3GPP Handover schemes in IEEE 80216m and 3GPP provide lower link layer handover latency while providing the required QoS level than the existing link layer handover schemes

System and method for handover capable of minimizing service delay in broadband wireless access communication system

Abstract: Disclosed is a method and a system for performing a handover capable of minimizing a service delay in a broadband wireless access communication system including a mobile station (MS), a serving base station (BS) providing services to the MS, and a target BS to which the MS hands over. The method comprises the steps of detecting that the handover from the serving BS to the target BS is necessary; and transmitting a request to the serving BS in order to perform portions of a handover process prior to the handover to the target BS.

Cellular radiotelephone system with dropped call protection

Abstract: An improved cellular telephone communication system is described having operational steps which prevent a call from being dropped due to a radiotelephone (130) not receiving a handoff instruction from its host base site (115). The system includes a switch controller (122) for determining that the radiotelephone requires a handoff from a first base site coverage area (110) to a second base site coverage area (112) and for communicating a handoff message to the associated first (115) and second base site equipment (119). The first base site equipment then transmits the handoff message to the radiotelephone. If the radiotelephone does not receive the message, it determines that the call has been lost, siezes a signalling channel from the second base site, and requests, via the second base site a call reconnection by transmitting a special message. The second base site then informs the radiotelephone of the handoff instruction and the handoff is completed with a successful reconnection of the call.