Showing papers on "NodeB published in 2010"

Self-configuration and self-optimization for LTE networks

Abstract: With the rapid growth of mobile communications, deployment and maintenance of cellular mobile networks are becoming more and more complex, time consuming, and expensive. In order to meet the requirements of network operators and service providers, the telecommunication industry and international standardization bodies have recently paid intensive attention to the research and development of self-organizing networks. In this article we first introduce both the market and technological perspectives for SONs. Then we focus on the self-configuration procedure and illustrate a self-booting mechanism for a newly added evolved NodeB without a dedicated backhaul interface. Finally, mobility load balancing as one of the most important selfoptimization issues for Long Term Evolution networks is discussed, and a distributed MLB algorithm with low handover cost is proposed and evaluated.

Handover method and apparatus

Abstract: Disclosed is a method in which in case where it is inappropriate for a particular Home (e)NodeB providing a service to a particular UE to continue to provide the service on the ground of a changed status, such as overload, temporary drop due to maintenance, expiry of CSG membership for the UE, increase of temporary interference, policy change, or the like, the Home (e)NodeB transmits information on a cause that the UE performs a handover to another base station to an control entity within a network. Furthermore, it is allowed for the entity within the network to store information on the cause. In addition, if the status of the particular Home (e)NodeB is changed, then the entity within the network is allowed to perform a reverse handover for the UE to the particular Home (e)NodeB on the basis of the information on the changed status and the information on the cause.

Method, system and evolved NodeB apparatus for implementing inter-evolved NodeB handover

Abstract: A method, a system and an evolved NodeB (eNB) apparatus for implementing inter-eNB switch are disclosed in the present invention. The method includes: when a user equipment switches from a source-side eNB to a target-side eNB, if the target-side eNB acquires via the Mobility Management Entity (MME) that the Serving Gateway (S-GW) has changed, the target-side eNB adds the new route relation of the S-GW and then updates the General Packet Radio Service (GPRS) Tunnelling Protocol User Plane (GTP-U) entity. The present invention can effectively solve the problem of the uplink data packet loss due to the time difference existing between the update to the Tunnel Endpoint Identifier (TEID) and the routing table by the eNB when inter-eNB switch is performed via X2 and the S-GW has changed, thus enhancing the user experience during the switch.

Mobile communication method, mobile communication system, and corresponding apparatus

Abstract: The present invention introduces a method for the network to optimize the route for user's local IP access, without affecting the access to operator's core network. With this mechanism, no excessive signalling is needed for the optimization. The present invention is also applicable to the corporate network that has multiple home NodeBs or home eNodeBs. Finer grain control on the services to be provided over different home NodeB or home eNodeB is also possible. Further, path optimization and continuation of the service upon handover can be controlled, and hence flexibility of the service can be secured.

Method and apparatus for scheduling uplink radio resources in radio communication system

Abstract: A method and an apparatus for scheduling uplink radio resources in a wireless communication system, and the method comprises: an evolved NodeB (eNB) allocating radio resources to user equipment (UE) according to the uplink channel quality information and the current logical channel information of the UE, determining the control signaling information of the radio resources, and notifying the control signaling information of the radio resources to the UE; Alternatively, after receiving the control signaling information of the radio resources sent by the eNB, the UE selecting corresponding radio resources for the logical channel according to the requirements of quality of service (QoS) of the logical channel and the control signaling information of the radio resources.

Timed fingerprint locating in wireless networks

Abstract: Systems and techniques for determining the location of user equipment (UE) in a wireless network are disclosed. These techniques leverage geometric calculations for an overlaid bin grid framework mapping the wireless network area to store differential values for each frame of the bin grid framework for each pair of relevant NodeBs. A timing offset can be determined, such that when a time value from a target UE is accessed, the location can be quickly determined with minimal real time computation. In an aspect, the target UE time value can be search for in the pre-computed differential value data set indexed by a relevant NodeB site pair to return a set of frames (forming a hyperbola between the site pair) that can be intersected with a second set of frames for a second NodeB site pair for the same UE. The intersecting frames can represent the location of the UE in the wireless network. Further, the data can be leveraged to correct timing in the network.

Apparatus for management of local ip access in a segmented mobile communication system

Abstract: The present invention introduces a method for managing the route to be used for the user's local device access traffic through the use of intelligent switching performed by the breakout node (eNodeB, home NodeB, or home eNodeB) together with the local access gateway node of the local service domain Essential information pertaining to performance of this intelligent switching is obtained through the communication of specific tokens using selected channels of communication A variety of combinations pertaining to the setup, selection and composition of token and channel is possible and described

System and method for supporting local ip connectivity for an (e)nodeb

Abstract: A system for supporting local IP connectivity for an (e)NodeB, the system including a mobile operator network with a PDN-Gateway or a GGSN, and at least one User Equipment (UE) that is associated with the (e)NodeB, is characterized in that a local gateway function (L-GW) is provided for the (e)NodeB, wherein an extension tunnel is established between the local gateway function (L-GW) and the PDN-Gateway or the GGSN of the mobile operator network. Furthermore, a corresponding system is disclosed.

Server for control plane at mobile communication network and method for controlling local ip access service

Abstract: Disclosed is a method of controlling a LIPA (Local IP Access) service in a server taking charge of the control plane within a mobile communication network. The method of controlling a LIPA service may include receiving an initial message from Home (e)NodeB. The initial message may include at least one of LIPA related information and capability information. The LIPA related information may include at least one of APN (Access Point Name) for LIPA and information for a local gateway, and the capability information may include an indicator indicating whether the Home (e)NodeB supports a LIPA function, and the initial message may include an access request message by a terminal. The method of controlling a LIPA service may further include determining whether the terminal can use a LIPA service at the Home (e)NodeB by considering at least one of the LIPA related information within the initial message, the capability information within the initial message, and subscriber information of the terminal, upon receiving the initial message; storing a result of the determination; generating an access accept message including an indicator indicating whether the terminal can use a LIPA service at the Home (e)NodeB; and transmitting an initial setup message including the generated access accept message to the Home (e)NodeB.

Timed fingerprint locating for idle-state user equipment in wireless networks

Abstract: Systems and techniques for determining the location of user equipment (UE) in a wireless network are disclosed. These techniques leverage geometric calculations for an overlaid bin grid framework mapping the wireless network area to store differential values for each frame of the bin grid framework for each pair of relevant NodeBs. A timing offset can be determined, such that when a time value from a target UE is accessed, the location can be quickly determined with minimal real time computation. In an aspect, the time value from an idle-state target UE can be accessed. The target UE time value can be searched among pre-computed differential value data sets indexed by relevant NodeB site pairs to return sets of frames that can facilitate converging on a location for the target UE. Intersecting frames can represent the geographic location of the UE in the wireless network. Further, the data can be leveraged to correct timing in the network.

Self-Configuration of Neighbor Cell List Utilizing E-UTRAN NodeB Scanning in LTE Systems

Abstract: This paper provides a scheme for self-configuration of a neighbor cell list (NCL) in long term evolution (LTE) systems. Especially, an initial NCL configuration scheme is proposed. In traditional systems, a system operator manually determmes NCL and uploads it into a base station, which is not efficient in many respects. By utilizing E-UTRAN NodeB (eNB) scanning, initial NCL can be autonomously generated reflecting the real radio environment. We also investigate the effect of "the neighbor cell decision threshold" and "cell types" on the NCL configuration performance. Simulation results show that the proposed approach is an effective and feasible solution for self-configuration of the initial NCL in mb:ed self-organizing networks.

Burst packet scheduler for improved ran efficiency in umts/hspa networks

Abstract: A method of generating optimal packet workload for achieving a balance between maximizing cell throughput and fairness across multiple users in UMTS/HSPA Network is disclosed. The packet scheduler of the current invention enhances the performance of other schedulers, such as Proportionally Fair Scheduler in NodeB and RNC in UMTS/HSPA Networks by monitoring recent RAN bandwidth to each mobile device, and increasing buffer occupancy of high rate data-flows in the RAN devices. The scheduler uses the desired performance goals of maximum cell throughput and fairness at various network congestion levels, and controls egress burst rate while delivering packets to the RAN (Radio Access Network).

Activation deactivation of secondary ul carrier in dc hsupa

Abstract: The present patent application discloses a method and apparatus for activating or de-activating a secondary carrier, comprising informing a serving radio network controller when a secondary carrier was activated or de-activated, receiving a confirmation from the serving radio network controller that non-serving NodeB cells have achieved synchronization, and scheduling a UE upon receiving confirmation. In another example, the present patent application discloses a method and apparatus for de-activating a secondary carrier, comprising controlling de-activation of the secondary carrier using high-speed shared control channel orders, receiving acknowledgement of said high-speed shared control channel orders, and informing a serving radio network controller when the secondary carrier was de-activated.

Method to facilitate user equipment handoff within a packet data communication system

Abstract: A method to facilitate user equipment (UE) handoff within a packet data communication system includes receiving at the Evolved NodeB (eNB) via a serving relay node an indication that the UE will undergo a handoff from the serving relay node to a target node; receiving at the eNB first packet data having a first payload and a first Internet protocol (IP) header identifying an address of the eNB; extracting, at the eNB, the first payload from the first packet data to form a first packet data unit (PDU) including the extracted first payload and a second IP header identifying the address of the eNB and an address of the target node; and transmitting, from the eNB to the target node, the first PDU to permit the target node to transmit the first payload of the first PDU to the UE, the target node being identified using the second IP header.

Radio problem detection assisted rescue handover for LTE

Abstract: In this paper we propose a radio problem detection based rescue handover for 3G Long Term Evolution (LTE). The radio problem detection based handover algorithm takes advantage of already existing Radio Link Failure (RLF) detection mechanism specified in 3GPP for LTE. In coverage limited scenarios as well as challenging interference and mobility conditions, the event triggered handover measurement report may not be even sent to Evolved NodeB at the time of RLF. In proposed algorithm UE shall monitor the downlink quality based on the cell-specific reference signal in order to detect the downlink radio link quality of the serving cell. In case of a detected radio link problem handover process is initiated to a better cell. The proposed handover algorithm is compared to the default UE assisted hard handover process by means of fully dynamic system level simulations. Based on the studies it can be concluded that the radio problem detection assisted handover algorithm decreases the amount of RLFs thereby improving the handover and system performance. Especially the RLFs that occur before the handover process is even started are basically non-existent.

Cell switching method and system

Abstract: The embodiment of the invention discloses a cell switching method and a cell switching system. The method comprises the following steps that: a radio network controller (RNC) judges that a cell needs to be switched according to a measurement report reported by user equipment (UE) and completes the reconfiguration of a wireless link of a source cell and a target cell, a source cell NodeB or target cell NodeB sends a cell switching command to the UE through a physical control channel; and the UE receives the cell switching command and finishes the switching process. The system comprises the RNC, the UE, the source cell NodeB and the target cell NodeB. The cell switching method and the cell switching system can improve the cell switching reliability and reduce the time delay of cell switching.

Achieving distributed load balancing in self-organizing LTE radio access network with autonomic network management

Abstract: Future Long Term Evolution (LTE) Radio Access Network (RAN) will benefit from a significant degree of self-organization. Autonomic Load Balancing (ALB) is considered as an important self-organizing function in LTE RAN. In this work, distributed ALB is achieved by Autonomic Network Management (ANM). Load conditions of eNBs (E-UTRAN NodeB) can be detected. Sizes and shapes of cellular coverage can be adjusted automatically according to load conditions, so as to balance load. Simulation results demonstrated that by the use of ALB, the system capacity can be improved significantly.

Radio base station

Abstract: A radio base station NodeB according to the present invention is configured, in EUL communication in "Time and Rate" system, to determine an SG to be notified to the mobile station scheduled in a next scheduling slot, based on maximum allowable reception power in the radio base station NodeB at a time of determining the SG to be notified to the mobile station scheduled in the next scheduling slot, and based on a DPCCH SIR target corresponding to respective SGs.

Method for providing connection type information and method for controlling radio resource of home (e)nodeb

Abstract: A method for providing connection type information in a network entity comprises: receiving, by the network entity, a connection request message including access mode information indicating at least one of an open access mode, a closed access mode, and a hybrid access mode, from a Home (e)NodeB having received a request from a terminal; determining, by the network entity, a connection type of the terminal based on the access mode information and the terminal's subscriber information; and transmitting, by the network entity, a connection accept message including information about the determined connection type, to the Home (e)NodeB, such that the Home (e) NodeB performs a radio resource control function with respect to the connection with the terminal.

IP (Internet Protocol) address allocation method and system

Abstract: The invention discloses an IP address allocation method and a system, which are used for determining the types of IP addresses allocated to user equipment (UE) by local networks through a user mobile control management entity in the PDNGW (Public Data Network Gate Way) and GGSN (Gateway GPRS Support Node) local networks without core networks and allocates the IP addresses of the type to the user equipment (UE). The IP address allocation method comprises the following steps that the user mobile control management entity requests the accessed information of the local networks according to the user equipment (UE) to indicate a home NodeB to access the user equipment (UE) to the local networks through establishing the radio bearers of the local networks; the user mobile control management entity determines the types of the IP addresses allocated to the user equipment (UE) by the local networks and indicates the user equipment (UE) to acquire the IP address of the type from the home NodeB;and the home NodeB allocates the information of the IP addresses according to a request sent by the user equipment (UE) and allocates the IP addresses for the user equipment (UE).

Evolved nodeB, relay node and connection initialization method thereof

Abstract: An evolved NodeB eNB, a first relay node (RN) and a connection initialization method thereof for use in a long term evolution (LTE) network are provided. The LTE network comprises the eNB, the first RN, a second RN and a mobility management entity (MME). In the LTE network of the present invention, various multi-hop protocols can be achieved by using different identification mapping implementations.

Handover Control for WCDMA Femtocell Networks

Abstract: The ability to seamlessly switch between the macro networks and femtocell networks is a key driver for femtocell network deployment. The handover procedures for the integrated femtocell/macrocell networks differ from the existing handovers. Some modifications of existing network and protocol architecture for the integration of femtocell networks with the existing macrocell networks are also essential. These modifications change the signal flow for handover procedures due to different 2?tier cell (macrocell and femtocell) environment. The handover between two networks should be performed with minimum signaling. A frequent and unnecessary handover is another problem for hierarchical femtocell/macrocell network environment that must be minimized. This work studies the details mobility management schemes for small and medium scale femtocell network deployment. To do that, firstly we present two different network architectures for small scale and medium scale WCDMA femtocell deployment. The details handover call flow for these two network architectures and CAC scheme to minimize the unnecessary handovers are proposed for the integrated femtocell/macrocell networks. The numerical analysis for the proposed M/M/N/N queuing scheme and the simulation results of the proposed CAC scheme demonstrate the handover call control performances for femtocell environment.

Information method and system of a user access mode

Abstract: The present invention discloses an information method of a user access mode, and the method comprises: when attempting to hand over a User Equipment (UE) to a target hybrid home (e)NodeB cell, a network element at a network side informs a target hybrid home (e)NodeB of a current user access mode of the UE via a handover signaling, wherein the user access mode is information on whether or not the UE is a member user of the target hybrid home (e)NodeB cell. The present invention further discloses an information system of a user access mode, in which an informing unit at a network side is used for a network element at the network side to inform, when attempting to hand over a UE to a target hybrid home (e)NodeB cell, a target hybrid home (e)NodeB of a current user access mode of the UE via a handover signaling. By using the method and system of the present invention, when the network attempts to hand over a UE to a target hybrid home (e)NodeB cell, the informing of a user access mode is realized to guarantee the priority of a member user of the hybrid home (e)NodeB in access and resource allocation.

Effect of Imperfect Channel Estimation on Multi-User Beamforming in LTE-Advanced System

Abstract: LTE-Advanced extends the number of transmit antennas of evolved NodeB (eNB) up to 8, which will provide substantial spatial degrees of freedom. However, the user is usually equipped with a small number of antennas due to space constraints. Thus, multi-user beamforming (MU-BF) was proposed to dramatically boost the spectrum efficiency by transmitting multiple users' data on the same time-frequency resource. The co-channel interference (CCI) among users scheduled on the same resource can be eliminated by block diagonalization (BD); however, the performance of downlink MU-BF with BD relies on the accuracy of channel estimation to a great extent. Therefore, the effect of imperfect channel estimation on MU-BF for the downlink of LTE-Advanced system is studied in this paper. The reference signal targeting data demodulation (DM-RS) and uplink sounding reference signal (SRS) for deriving the downlink channel in TDD system are considered with different error models respectively. The estimation errors are modeled through link level simulations. It is shown that the imperfect SRS and DM-RS channels degrade the system performance in different degree through system level simulation.

Method and system for transmitting multi-carrier uplink data at network-side

Abstract: The present invention discloses a method and system for transmitting multi-carrier uplink data at a network side. The method comprises: whenever setting up or adding a multi-carrier enhanced dedicated channel cell, a radio network controller notifying a NodeB dominating the multi-carrier enhanced dedicated channel cell of carrier identifier information of a carrier corresponding to the multi-carrier enhanced dedicated channel cell; and whenever receiving data transmitted by a terminal using a multi-carrier high-speed uplink packet access technique in the multi-carrier enhanced dedicated channel cell via the carrier, the NodeB carrying the carrier identifier information of the carrier bearing the data in enhanced dedicated channel uplink data frames when constructing the enhanced dedicated channel uplink data frames, and transmitting the constructed enhanced dedicated channel uplink data frames to the radio network controller. The present invention can avoid the problem of confusion of the received data from different carriers.

Donor evolved nodeb, relay node and communication method thereof

Abstract: A relay node, a donor evolved NodeB (DeNB) and a communication method thereof for use in a long term evolution (LTE) network are provided. The LTE network comprises the relay node and the DeNB. In the present LTE network of the present invention, at least two bearers can be set up between the relay node and the DeNB so that signaling messages can be transmitted between the relay node and the DeNB based on different priorities.

Method for acquiring information of home node b, method for balancing load, and apparatuses therefor

Abstract: The present invention discloses a method for acquiring information of a home NodeB, a method for balancing load, and implementation apparatuses thereof, which are used to solve the problem how to guide a UE to move to an appropriate home NodeB when a macro cell performs load balancing In the present invention, information of a target NodeB is acquired actively through a macro NodeB, and according to an access type of the target NodeB, subscribers of the macro NodeB are timely balanced to the home NodeB which can provide services, thereby reducing a call drop rate resulted from blind handover Since measurement information of the UE is fully considered, success rate of balancing handover is enhanced, and the object of performing effective load balancing in a home NodeB environment is achieved

Method and system for processing failure of handover to closed subscriber group cell

Abstract: A method and system for processing failure of a handover to a CSG cell are provided, which are used to solve the technical problem of the interface signaling consumption and network performance degradation caused by the handover of a UE to a non-member CSG cell. When the UE is not an authorized subscriber of a target CSG cell, a core network notifies a source NodeB of the non-member failure information, thereby enforcing the UE to update an allowed CSG list to prevent the source NodeB or a source Radio Network Controller (RNC) or a source HNB from sending a handover required signaling to identical target cells, or prevents the UE from sending a handover request to identical target cells frequently by setting a delay timer, or the source NodeB or the source RNC or the source home NodeB prevents the UE from handing over to a neighboring CSG cell with identical CSG Identity (ID) under the condition of being able to acquire the CSG ID of the target CSG cell. The method and system can prevent sending the handover request signaling to identical target CSG cells again after the handover failure of the UE, thereby reducing the signal consuming between the interfaces and enhancing the performance of the network.

WIRELESS COMMUNICATION SYSTEM IN WHICH NodeB BROADCASTS IDENTIFICATION INFORMATION ON RELAY APPARATUS

Abstract: A wireless communication system includes a first NodeB that forms a cell; and a relay apparatus to which the first NodeB connects and which relays data transmitted and received between the first NodeB and a core network. The first NodeB broadcasts identification information on the relay apparatus to which the first NodeB connects.

Data transmission method between user equipment

Abstract: The invention discloses a data transmission method between UE, which comprises the following steps: judging whether a calling UE and a called UE are positioned under the same radio network controller (RNC) or not, if so, judging whether the calling UE and the called UE are positioned in the same base station NodeB under the RNC by using the RNC, and if so, sending indication for performing local exchange of a NodeB layer to the NodeB; and collocating local exchange addresses of user plane data for the calling UE and the called UE by using the NodeB according to the indication for performing the local exchange of the NodeB layer, and performing the local exchange of the NodeB layer on the user plane data between the calling UE and the called UE according to the local exchange addresses. The technical scheme disclosed by the invention can save bandwidths of an Iu port and an Iub port.