Showing papers on "NodeB published in 2011"

Optimized Home Evolved NodeB (eNB) Handover in an LTE Network

Abstract: A method to provide an optimized intra-HeNB GW handover operation that reduces signaling to and from an LTE MME (Mobility Management Entity) function of the 3GPP E-UTRAN Evolved Packet core (EPC). In operation, an HeNB Gateway (GW) intercepts handover requests from a source HeNB to a target HeNB and processes these requests locally, with minimal interaction from the MME. Where possible, messaging to and from the MME is minimized and/or reduced, irrespective of the 3GPP requirement that the GW relay all handover-related messages to the MME.

Radio resource allocation scheme for device-to-device communication in cellular networks using fractional frequency reuse

Abstract: Device-to-Device (D2D) communication is the technology enabling user equipments (UEs) to directly communicate with each other without help of evolved nodeB (eNB). Due to this characteristic, D2D communication can reduce end-to-end delay and traffic load offered to eNB. However, by applying D2D communication into cellular systems, interference between D2D and eNB relaying UEs can occur if D2D UEs reuse frequency band for eNB relaying UEs. In cellular systems, fractional frequency reuse (FFR) is used to reduce inter-cell interference of cell outer UEs. In this paper, we propose a radio resource allocation scheme for D2D communication underlaying cellular networks using FFR. In the proposed scheme, D2D and cellular UEs use the different frequency bands chosen as users' locations. The proposed radio resource allocation scheme can alleviate interference between D2D and cellular UEs if D2D device is located in cell inner region. If D2D UEs is located in cell outer region, D2D and cellular UEs experience tolerable interference. By simulations, we show that the proposed scheme improves the performance of D2D and cellular UEs by reducing interference between them.

Adaptive scheduling and HARQ management for cooperative transmissions

Abstract: Disclosed herein is HARQ management, scheduling, and measurements, among other things, for cooperative communication. For example, methods herein may be used in situations wherein relaying or helping mechanisms may comprise the use of a relay node which is part of a fixed infrastructure or a relay node which may be a mobile wireless transmit/receive unit (WTRU). In said situations, a first transmission with first data is established between an evolved NodeB (eNB) and a WTRU. A second transmission with second data is established between a relay node (RN) and the WTRU. Said first and second data are combined for decoding. A single HARQ feedback for said first and second transmissions is sent from the WTRU to the eNB.

Carrier-aggregation-based handover method

Abstract: Provided are a method for performing handover in a cellular mobile communication system that supports a carrier aggregation, and a user equipment and a node base (NodeB) using the method. A connection between the user equipment and the NodeB may be maintained and information may be exchanged using a plurality of serving carriers. Before performing the handover, the user equipment may perform measurement with respect to a neighboring NodeB supporting the carrier aggregation, and may provide parameter information to the NodeB in order to support a carrier aggregation function required for the handover. In a handover seamless environment, the continuity of a service may be provided and the performance of the service may be enhanced.

Handover Scheme in LTE-based Networks with Hybrid Access Mode Femtocells

Abstract: Femtocell networks that use Home evolved NodeB (HeNB) and existing networks for backhaul connectivity can fulfill the upcoming demand for high data rates in wireless communication systems as well as extend the coverage area. We consider some parameters for handovers, including interference, velocity, RSS and quality of service (QoS) level. We propose a new handover strategy between the femtocell and the macrocell for LTE (Long Term Evolution) -based networks in hybrid access mode. This strategy can avoid unnecessary handovers and can reduce handover failure. In this paper, we analyze three scenarios for handover decision strategy procedures: hand-in for Closed Subscriber Groups, hand-in for non-Closed Subscriber Groups, and hand-out.

Management of neighbor cell lists and physical cell identifiers in self-organizing heterogeneous networks

Abstract: In this paper, we propose self-organizing schemes for the initial configuration of the neighbor cell list (NCL), maintenance of the NCL, and physical cell identifier (PCI) allocation in heterogeneous networks such as long term evolution systems where lower transmission power nodes are additionally deployed in macrocell networks. Accurate NCL maintenance is required for efficient PCI allocation and for avoiding handover delay and redundantly in creased system overhead. Proposed self-organizing schemes for the initial NCL configuration and PCI allocation are based on evolved universal terrestrial radio access network NodeB (eNB) scanning that measures reference signal to interference and noise ratio and reference symbol received power, respectively, transmitted from adjacent eNBs. On the other hand, the maintenance of the NCL is managed by adding or removing cells based on periodic user equipment measurements. We provide performance analysis of the proposed schemes under various scenarios in the respects of NCL detection probability, NCL false alarm rate, handover delay area ratio, PCI conflict ratio, etc.

Dissecting 3G uplink delay by measuring in an operational HSPA network

Abstract: Users expect mobile Internet access via 3G technologies to be comparable to wired access in terms of throughput and latency. HSPA achieves this for throughput, whereas delay is significantly higher. In this paper we measure the overall latency introduced by HSUPA and accurately dissect it into contributions of USB-modem (UE), base station (NodeB) and network controller (RNC). We achieve this by combining traces recorded at each interface along the data-path of a public operational UMTS network. The actively generated sample traffic covers real-time applications. Results show the delay to be strongly dependent on the packet size, with random components depending on synchronization issues. We provide models for latency of single network entities as well as accumulated delay. These findings allow to identify optimum settings in terms of low latency, both for application and network parameters.

Location of mobile devices served by a relay node

Abstract: A network-based wireless location system (WLS) is configured to locate mobile devices, or user equipment (UE), wirelessly communicating with a relay node (RN). The RN is wirelessly backhauled to a serving donor enhanced NodeB (donor eNB), and the RN has eNB functionality to communicate with the UE and has UE functionality to communicate data from the UE with the donor eNB. The WLS carries out a method including receiving uplink transmissions from the RN, using the uplink transmissions from the RN to compute a location estimate for the RN, and determining a location estimate for the UE based on the location estimate for the RN.

Method and system for positioning mobile station in handover procedure

Abstract: A method for obtaining a secure key is provided. The method includes sending an Access Safety Management Entity Key (KASME) to a gateway after finishing authentication and security process by a Mobility Management Entity (MME) in a core network; and computing, by the gateway, a Next Hop (NH) according to the KASME. The method provides a method for ensuring a working of a secure key chain when a handover process is terminated at a Hybrid Evolved NodeB Gateway (HeNB GW). Thus, key information cannot be lost when the handover process is terminated at the HeNB GW, and an impact of the handover process on a core network is reduced, and the efficiency of a User Equipment (UE) handover is improved.

Server in charge of control plane within mobile communication network and method for controlling service in server

Abstract: According to the present description, data of a user can be detoured (offloaded) to a wired network such as a public communication network even through a Home (e)NodeB. In addition, when the data of the user is detoured (offloaded) to the wired network such as the public communication network even through the Home (e)NodeB, a local IP access (LIPA) service can be selectively supported according to the user or a UE.

Interference coordination method among cells and evolved NodeB (eNB)

Abstract: The invention discloses an interference coordination method among cells and an evolved NodeB (eNB), belonging to the technical field of mobile communication. The technical scheme of the invention is as follows: a path loss compensation scaling factor k(i) is defined; k(i) is calculated handed down to user equipment (UE) by the eNB; and when calculating the transmitted power of an uplink traffic channel, the UE scales an original path loss compensation factor alpha according to the k(i), so that the update frequency of the actual path loss compensation factor is improved, thus the UE can respond to changes of edge cases of the cell and neighboring cells in time, thereby improving the system performance.

Method and apparatus for measuring channel state information

Abstract: A method is provided for measuring CSI. A Macro UE determines a restricted measurement resource pattern for CSI measurement. The restricted measurement resource pattern is reported from the Macro UE to a Macro NodeB. The CSI of the restricted measurement resource pattern is measured. The CSI is reported from the Macro UE to the Macro NodeB for scheduling a data transmission resource of the Macro UE in the restricted measurement resource pattern according to the CSI.

Home Nodeb (HNB) Mobility In A Cell Forward Access Channel (Cell_Fach)State

Abstract: Disclosed herein are systems and methods for managing home nodeB (HNB) mobility in forward access channel (Cell_FACH) states. According to an aspect, a method may be implemented at a Wireless Transmit/Receive Unit (WTRU). The method may include determining whether to communicate an indication to a network node for extended measurement occasion. Further, the method may include communicating the indication to the network node in response to determining to communicate the indication.

Method, apparatus, and system for identifying different frame structures

Abstract: Embodiments of the present invention disclose a method, an apparatus, and a system for identifying different frame structures to ensure backward compatibility of an LTE-advanced (LTE-A) network. The method for identifying different frame structures includes: receiving a radio frame on a frequency division duplex (FDD) downlink carrier, where the radio frame includes an identifier of a frame structure; and identifying the frame structure according to the identifier of the frame structure included in the radio frame. Embodiments of the present invention also disclose a user equipment (UE), an evolved NodeB (eNB), and a system for identifying different frame structures. Through the technical solutions provided by embodiments of the present invention, LTE-A users can identify the frame structure carried on the FDD downlink carrier when accessing the network initially, but LTE users are unaware of the change of the frame structure.

Method, system and user's set for setting transmission time spacing of reinforced special channel

Abstract: The present invention relates to the radio communication field and discloses a TTI setting method, the system and the user equipment of E-DCH; when the UE is converted from the idle state or the state of UEA-PCH, CELL-PACH or CELL-FACH to the state of CELL-DCH, the signal alternation and the state conversion delay are effectively reduced With the present invention, the UE reports to the RNC whether the UE is provided with the function of sustaining 2ms TTI; the UC or NodeB reports to the RNC of the uplink channel quality through measurement; the RNC directly sets the length of the TTI of theE-DCH arranged for the UE to be 2ms when the function and the channel quality are permitted; the UE also reports the RNC of the uplink power residue and/or uplink operation volume for the RNC to decide the TTI length and make the obtained TTI more accurate; the quality of uplink channel can be estimated by the UE according to the quality of the downlink channel and reported to the RNC; the quality can also be reported to the RNC after the NodeB measures the SIR of the PRACH

Design of Control Architecture for Downlink CoMP Joint Transmission with Inter-eNB Coordination in Next Generation Cellular Systems

Abstract: CoMP (Coordinated Multiple Point transmission) is being discussed in 3GPP (3rd Generation Partnership Project) to improve the cell edge performance as well as the total cell throughput of mobile systems. In this paper, we focus on the control architecture to realize downlink CoMP JT (joint transmission) with inter eNB (evolved NodeB) coordination. We have designed the control architecture with a distributed approach. Since user data is simultaneously transmitted from multiple eNBs to a UE (User Equipment), the schedulers of the coordinated eNBs need to negotiate on resource allocation for CoMP UEs over a backhaul network. This process will be a heavy burden due to the delay of the backhaul network and the complexity of scheduling algorithm that has to take into account a dynamic multi-UE and multi-cell scenario. We propose a simple and practical resource allocation method by which the scheduler in each eNB can make scheduling calculation independently without any resource contention. We also implement the proposed schemes as a real system for evaluation.

Wireless communication systems and methods for processing handover messages thereof and computer program products thereof

Abstract: Methods for processing messages in a wireless communication system including a femto network (FN) including at least one Home NodeB, a core network (CN), a macro network (MN) including a serving base station and a gateway located between the FN and the CN is provided. First, a handover request is received from the Home NodeB or a server of the CN when two mobile devices are communicating. When the handover request is received from the Home NodeB, the gateway transmits a call setup request to the CN to setup a first call path between the gateway and the CN according to the handover request, transmits the handover request to the CN through the first call path to obtain a second call path from the CN to the FN and directs the server to perform the handover request according to the first call path and the second call path.

Method and system for managing carrier information in multi-carrier system

Abstract: The present invention discloses a method for managing carrier information in a multi-carrier system, and the method includes: when an activated carrier of a User Equipment (UE) is changed, a base station (NodeB) informing a Radio Network Controller (RNC) of the change information of the activated carrier of the UE. The present invention also discloses a multi-carrier system and an RNC. The present invention triggers the RNC to perform resource re-allocation by the NodeB sending the change information of the activated carrier, which guarantees a rational allocation of network resources.

Management of high-speed dedicated physical control channel decoding in soft handover

Abstract: Methods for management of high-speed dedicated physical control channel decoding in soft handover procedures include various methods that include controlling reverse link transmission power. Different algorithms may be used for controlling transmission power, including algorithms summarized as determining path-loss differences, determining a difference between pilot channel power from HSDPA serving and non-serving NodeBs, and adjusting a signal-to-interference target, an attenuation factor, or similar parameters for controlling reverse link power. Another of the management methods includes selecting a HSDPA serving NodeB for a mobile entity jointly based on the downlink and uplink channel quality, loading, and resource availability. The methods, and aspects of the methods, may be embodied in wireless communications apparatus, for example, in a NodeB or mobile entity.

Authorization request method, system and device

Abstract: The invention discloses an authorization request method, an authorization request system and an authorization request device. The method comprises the following steps that: user equipment establishes an Internet protocol connectivity access network (IP-CAN) session by a home evolved NodeB, wherein the home evolved NodeB is connected to a third generation partnership project (3GPP) core network by a subscribed fixed network line; a policy and charging rules function (PCRF) selects an interwork-PCRF (I-PCRF) for the IP-CAN session, wherein the PCRF selects the same I-PCRF for the IP-CAN session established by the subscribed fixed network line; and the PCRF makes a request for performing quality of service (QoS) authorization on the IP-CAN session to the I-PCRF. By the method, the system and the device, QoS control can be performed on all the user equipment (UE) accessing the network by the home evolved NodeB, so that total demands on QoS may not exceed the QoS which can be provided by the subscribed fixed network line accessed by the home evolved NodeB.

Method, System, and Apparatus for Tracing User Equipment in a Network

Abstract: A method, system, and apparatus for tracing a user in a network are provided. The method includes activating a task for tracing a user in a network according to a tracing task message sent by an Element Management System (EMS), and sending the tracing task to an Evolved NodeB (eNodeB) through an S1 link. Therefore, the activated task for tracing user in a network can be sent through the S1 link, so as to realize tracing the user in the network in the network.

Method for reporting scheduling information

Abstract: The invention discloses a method for reporting scheduling information, which is suitable for the condition that User equipment (UE) supports a multicarrier High Speed Uplink Packet Access (HSUPA) In the method, the current path loss information of Total Enhanced Dedicated Channel (E-DCH) Buffer State (TEBS), High Priority Logic Channel Buffer State (HLBS), High Priority Logic Channel Identity (HLID), Service Cell and Neighborhood Cell Path Loss Information (SNPL), closed loop UE Power Allowance (UPH) or UE of the multicarrier HSUPA supported by the UE are filled in the scheduling information, and corresponding methods for reporting the scheduling information to the NODEB are provided aiming at the fact that whether the UE adopts an Enhanced Physical Uplink Channel (E-PUCH) or not so as to solve the problems that UE constructs and reports the scheduling information when the UE supports the multicarrier HSUPA

Device and method for improved closed loop diversity

Abstract: A NodeB (105) for an HSPA enabled WCDMA network (100), arranged (11, 12, 13) to transmit beam forming instructions to a User Equipment, a UE (1 10), which is arranged for beam forming. The beam forming instructions comprise information identifying a code book with one or more code words, and the NodeB is also arranged to transmit code words from said code book to the UE at a certain rate. The NodeB is further arranged to determine said rate based on dynamically varying information available in the WCDMA network, and to receive said information on the code book from an RNC upon configuration of the U E or to choose code book based on said dynamically varying information available in the WCDMA network.

Methods and apparatuses for transmission power control of uplink mimo transmissions

Abstract: The disclosure relates to methods and apparatuses that facilitate power and quality control of uplink MIMO transmissions A method in a NodeB comprises controlling (50) transmission power of multiple pilot signals transmitted by a user equipment by using a single inner power control loop operating on at least one pilot signal of the multiple pilot signals Some disclosed embodiments also relate to adjustment (60) of a quality target applied by the single inner power control loop and to updating (71, 72) of a power offset for computing the number of bits that the user equipment can transmit on a stream that is associated with a pilot signal that is not power controlled by the single inner power control loop

Inter-base station connection establishment method

Abstract: The invention provides an inter-base station connection establishment method, which comprises that: after discovering a new neighbor cell, a first network node transmits a first request message comprising information about a third network node with the neighbor cell to a second network node; the second network node transmits a second request message comprising the cell information of the first network node to the third network node; the third network node transmits a first response message comprising the information about the first network node to the second network node; and the second network node transmits a second response message comprising the cell information of the third network node to the first network node, and the first network node establishes a communication link with the third network node by utilizing the cell information of the third network node. By the method, X2 interface connection between a Relay base station or a home NodeB and another base station can be established, thereby realizing X2-interface-based application such as mobile switching and the like.

Device and method for HSPA WCDMA uplink pilots

Abstract: A UE (115), for an HSPA WCDMA system (100), equipped with a first (111) and a second (112) transmit antenna, and arranged (15, 17) to use one or more sets of pre-coding weights for transmission. The UE (115) is arranged to receive (14) instructions from a NodeB (105) on the set or sets of pre- coding weights to be used, and to transmit (16) a first and a second pilot signal, and to use a first set of pre-coding weights for the first pilot signal and a second set of pre-coding weights for the second pilot signal, where the first set of pre-coding weights is the same as the UE (115) uses for transmitting a first data stream, and to use different spreading codes for the first data stream and for the first pilot signal.

Method and arrangement in a communications network

Abstract: A method for enhancing Random Access Channel (RACH) performance is provided. First timing settings to be used by a first set of user equipments for a first Acquisition Indicator Channel (AICH) response timing are explicitly or implicitly signaled from a NodeB or from a Radio Network Controller (RNC) to a user equipment. Further, second timing settings to be used by a second set of user equipments for a second AICH response timing are explicitly or implicitly signaled from the NodeB or from the RNC to the user equipment.

Method, apparatus, and system for sending a data packet

Abstract: The present invention relates to radio communications technologies and discloses a method, an apparatus, and a system for sending a data packet to avoid repeated forwarding of data when a user equipment hands over between an access point and an evolved NodeB. The method includes: receiving, by an evolved NodeB, a data packet sent by a core network and sending the data packet to a current access point; and keeping caching the data packet on the evolved NodeB before determining that a user equipment has correctly received the data packet from the current access point. The present invention is applicable to data transmission in a network.

Method, apparatus and system for security processing in switch process

Abstract: A method, an apparatus, and a system for security processing in a handover process in the field of communication technologies are provided, including: in a handover preparation and handover execution processes performed by a user equipment UE and a source node and a target node on a network side, obtaining, by the target node, security capability information of the UE provided by the source node or a security verification entity, where the security verification entity includes a gateway in case of UE handover under a NodeB or a donor NodeB in case of UE handover under a relay node; and if the source node provides the security capability information of the UE, the method further includes: sending a path modification ACK message to the target node if the security verification entity verifies that the security capability information of the UE carried in the path modification request message is consistent with locally stored security capability information of the UE. Embodiments of the present invention ensure that the target node can select appropriate security algorithms, thus further improving security of the optimized handover process.

Method, device and system for configuring multicast broadcast single frequency network (MBSFN) sub-frames

Abstract: The invention relates to the field of communication, and discloses a method, a device and a system for configuring multicast broadcast single frequency network (MBSFN) sub-frames, which are used for balancing the data throughput of a long term evolution advanced (LTE-A) system The method comprises that: a relay node reports MBSFN configuration reference information which is locally configured or downloaded by an operation administration and maintenance (OAM) entity, and a donor E-UTRAN NodeB (DeNB) can acquire the resource need conditions of an access link of the relay node according to the received MBSFN configuration reference information to configure an accurate number of MBSFN sub-frames at accurate positions for the RN Therefore, the phenomenon of data jamming or small data volume in the system can be avoided, the data capacity of the system can be balanced, and the overall data throughput performance of the system can be further improved effectively Simultaneously, the invention discloses the DeNB, the RN and a communication system