Abstract: A base station of a first mobile communication mode communicates with a terminal in the first mobile communication mode and transmits a radio signal in a second mobile communication mode, and a base station of the second mobile communication mode communicates with the terminal in the second mobile communication mode and transmits a radio signal in the first mobile communication mode. A first unit of a dual-mode portable terminal communicates with the base station of the first mobile communication mode in the first mobile communication mode, receives the radio signal of the first mobile communication mode transmitted from the base station of the second mobile communication mode and determines based upon this radio signal whether the base station of the second mobile communication mode exists. Similarly, a second unit of the dual-mode portable terminal determines whether the base station of the first mobile communication mode exists.

Abstract: A method of performing a handover between heterogeneous networks and user equipment apparatus for the same are disclosed. The user equipment apparatus includes a first type communication module configured to transceive a signal with a first type base station (BS) using a first wireless communication scheme, a second type communication module configured to transceive a signal with a second type BS using a second wireless communication scheme, and a processor configured to control the handover to be performed on a second type BS operating in an idle state with the second type communication module when a signal is received from a first type BS operating in an active state with the first type communication module, wherein the signal request that the UE performs the handover to the second type BS operating in an idle state with the second type communication module from the first type BS.

Abstract: A technique is disclosed, according to which a race condition between a PMIPv6 binding by a PBU message of PMIPv6 and a CMIPv6 binding by a BU message of CMIPv6 can be resolved. MN 200 has a plurality of radio communication interfaces, and a first interface is connected to MAG 220 of a home PMIPv6 domain 230, for instance. In case the connection of a second interface is changed from MAG 221 of a home PMIPv6 domain to AR 222 of a CMIPv6 domain 231, a BU message 262 is transmitted from the second interface to LMA/HA 250, and identification information of this BU message is notified to MAG from the first interface. By adding time information to this identification information and by transmitting it to LMA/HA, MAG can identify transmission time of the BU message (i.e. relative order with the other messages) from this time information.

Abstract: Method and apparatus for base stations and subscriber units allows soft handoff of a CDMA reverse link utilizing an orthogonal channel structure. Subscriber units transmit an orthogonally coded signal over a reverse link to the base stations. A given base station provides timing control of the timing offset of the reverse link signal. Based on at least one criterion, an alignment controller determines that the given base station should hand off timing control to another base station, and a soft handoff process ensues. In response to a command or message for soft handoff of the subscriber unit from the given base station to another base station, the subscriber unit makes a coarse timing adjustment to the timing of the coded signal. The subscriber unit may make fine timing adjustments based on feedback from the base station controlling timing. Multiple base stations may provide power control feedback to the subscriber unit.

Abstract: A distributed antenna system (DAS) is provided, comprising a host unit and a plurality of remote placed to define a common coverage area. Each of the plurality of remote units is communicatively coupled to the host unit, points at least partially towards the common coverage area, and simulcasts data from the host unit.

Abstract: A user equipment terminal for measuring signal power in a neighbor cell includes a movement speed estimating unit configured to estimate a movement speed of the user equipment terminal or a fading frequency of a propagation; a measurement bandwidth determining unit configured to determine a measurement bandwidth according to the movement speed or the fading frequency of the propagation; and a measurement unit configured to measure signal power in the neighbor cell within the determined measurement bandwidth.

Abstract: A mobile communication method according to the present invention is a mobile communication method in which a mobile station is handed over from a cell #B and is subordinate to a radio base station to a cell #C and is subordinate to a radio base station, and includes a step of transmitting “Measurement Configuration” for instructing to measure and report a desired radio quality to the mobile station, a step of transmitting, by the radio base station, “HO Request”, which includes identification information assigned to the cell #B, to the radio base station, a step of transmitting, by the radio base station, “HO Request Ack” including “HO Command” not including “Measurement Configuration” to the radio base station in response to the identification information assigned to the cell #B, and a step of transmitting, by the radio base station, the “HO Command” to the mobile station.

Abstract: Systems and method are presented for a wireless Base Station (BS) of a host Operator to allow access to its Radio Access Network (RAN) by both Subscriber Stations associated with the host Operator and Subscriber Stations associated with other Operators, in which the first set of Subscriber Stations are connected by a general backhaul channel to the host Operator's Core Network data source, and the second set of Subscriber Station are connected by dedicated backhaul channels to Core Network data sources of the other Operators. In this manner, the host Operator provides partial roaming to the second set of Subscriber Stations, which use the host Operators RAN and wireless BS, but not the host Operator's network infrastructure.

Abstract: The present invention relates to a solution for handling handover of connections for a user equipment from a packet switch network to a circuit switched network. This is provided as a method implemented in a node and system. The method is provided in a telecommunications network (100) connecting user equipment, i.e. UE, (101) communicating wirelessly (111) with the network. The method comprising steps of detecting (301) that handover is required from a packet switched, i.e. PS, based network (102) to a circuit switched, i.e. CS, based network (103), initiating (302) in a source mobility management node (104) a single radio voice call continuity, i.e. SVRCC, initiating (303) a PS to PS handover for non-voice components with information about voice related parameters and a PS to CS handover indicator, executing (304) hand over, sending (305) an update to a serving gateway, i.e.

Abstract: An apparatus and a method of a macro terminal for controlling interference in a wireless communication system of a hierarchical cell structure are provided. The method includes setting measurement reporting configuration for a blanking trigger per measurement identifier allocated by a macro base station, measuring a receive signal strength of a neighbor base station, comparing the measured receive signal strength value with a reference receive signal strength value of the measurement reporting configuration for the blanking trigger, and according to a comparison result, transmitting to the macro base station, a measurement report message comprising a measurement identifier corresponding to the measurement reporting configuration for the blanking trigger of a pico base station.

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.

Abstract: The present invention provides a radio base station apparatus that is capable of freely expanding an area, improving the degree of freedom in designing of the area significantly and reducing the equipment investment. The radio base station apparatus includes: a plurality of transmission/reception units which are remotely installed in a service area and to which necessary numbers of carriers and sectors are assigned in accordance with the respective installation areas; a modulation/demodulation unit which can set/modify the soft handover enabled range and modulates/demodulates a signal transmitted/received to/from the transmission reception units; and a selector switch which is connected to the transmission/reception units remotely installed in the service area via cables so as to select connections between the modulation/demodulation unit and the transmission/reception units.

Abstract: Embodiments of the present invention make it possible to reduce loss and delay of downlink user data transmitted at regular time intervals in a mobile communication system employing a hard handover method, and make it possible to easily perform high-quality handover solely by a handover-starting base station. A base station for transmitting downlink user data at regular time intervals to a mobile station is disclosed. The base station is configured to transmit a handover-command signal immediately after transmitting the downlink user data to the mobile station.

Abstract: A method (700, 800) and apparatus (500, 600) for distinguishing cells with the same physical cell identifier is disclosed. The method can include receiving (820) a handover request message including target cell timing offset information at a potential target cell base station, where the potential target cell base station can have a physical cell identifier. The method can include comparing (830) the received target cell timing offset information with stored timing offset information at the potential target cell base station. The method can include sending (840) a handover request accept message if the received target cell timing offset information is substantially equal to the stored timing offset information. The method can also include receiving (720), at a wireless terminal, a target cell physical cell identifier and determining (730) a target cell timing offset of a radio frame of the target cell with respect to reference timing of a serving cell.

Abstract: It is presented a method for a femtocell base station, for facilitating communication between a communication terminal and a core network. The method comprises the steps, performed in the femtocell base station, of: sending a first femtocell base station message to the communication terminal; receiving a first terminal message from the communication terminal, the first terminal message comprising a first sequence number; and repeatedly sending further femtocell base station messages to the communication terminal and receiving corresponding terminal messages, comprising incremented sequence numbers, from the communication terminal, such that an expected next terminal message from the communication terminal comprises a sequence number being equal to the first sequence number. A corresponding femtocell base station, computer program and computer program product are also presented.

Abstract: A method in a wireless communication terminal including generating a first averaged signal measurement on a first carrier frequency, wherein the first averaged signal measurement is based on a first averaging period, producing a first filter output based on the first averaged signal measurement weighted by a first weight, generating a second averaged signal measurement on the first carrier frequency, wherein the second averaged signal measurement is based on a second averaging period, and producing a second filter output based on the first filter output and based on the second averaged signal measurement weighted by a second weight, wherein the first weight is less than the second weight if the second averaging period is greater than a threshold.

Abstract: In an example embodiment, an access point (AP) uses out-of-band signaling on a single non-DFS (Dynamic Frequency Selection) frequency band radio in an N-radio system to synchronize information with neighboring APs and to learn about their radio interfaces. This enables the AP to be able to acquire information about neighbor APs on different frequency bands and to build and maintain mesh routing structures while minimizing backhaul down-time.

Abstract: A method and apparatus for handling a call transfer from a circuit switched access network to a packet switched access network. A Mobile Switching Center Server receives a notification that a call for a terminal requires handover from a circuit switched access network to a packet switched access network. The MSC Server determines whether the terminal is currently registered in an IMS network and/or whether the MSC Server is registered such that it can perform handover from the circuit switched access network to the packet switched access network. If so, then return Single Radio Voice Call Continuity is invoked to perform a handover of the call from the circuit switched access network to the packet switched access network. If not then the MSC Server invokes error handling procedures.

Abstract: When detecting occurrence of an event for transmitting a measurement report of a radio condition of a cell at a frequency set for a base station apparatus, to the base station apparatus (3) communicating with a terminal apparatus (2), the terminal apparatus (2) in a wireless communication system (1) creates a measurement report including information indicating radio conditions of cells at a frequency at which the event occurred and at another different frequency. The base station apparatus (3) controls whether or not to perform handover of the terminal apparatus (2) to another cell, on the basis of the measurement report transmitted from the terminal apparatus (2). Thereby, there is provided a wireless communication system in which a base station apparatus and the terminal apparatus are communicable with each other using multiple frequencies, the wireless communication system being capable of shortening time required for handover.

Abstract: A wireless communication terminal, comprises: a requesting section that is configured to request content of a broadcast/multicast service; a storage section that is configured to store information on the content requested by the requesting section; and a control section that, when a handoff is performed, is configured to control a handoff destination base station in order to request the content stored in the storage section based on the information on the content.

Abstract: In an embodiment, an application server receives a request to initiate a group communication session (GCS) over a Wireless Wide Area Network (WWAN) with a communication group. The application server obtains location information of a set of devices participating in the GCS and determines that the GCS can be supported between the set of devices via a Personal Area Network (PAN), after which the application server transitions support for the GCS from the WWAN to the PAN. In another embodiment, an originator begins a periodic broadcast of a local PAN signal announcing the GCS after failing to set-up the GCS via the WWAN. Target device(s) in the communication group receive the local PAN signal, determine not to transmit their own local PAN signal and then convey a session acceptance message to the originator. The GCS is then established between the target device(s) and the originator over the PAN.

Abstract: A method and apparatus of optimizing transitioning between EVDO and CDMA 1X systems in a hybrid access terminal, the method having the steps of: preventing a reconnect data call from being sent from the hybrid access terminal. The preventing step including checking whether a transition between an EVDO and a CDMA 1X system is successful; and if not blocking the data call, and/or checking whether an EVDO received signal strength indication is greater than or equal to a receiver sensitivity on the hybrid access terminal; and if yes, allowing the hybrid access terminal to connect to the EVDO system, and/or delaying a connection timer for connecting to the EVDO system and/or applying fast dormancy to the hybrid access terminal in an EVDO state.

Abstract: A method in a mobile device for use in a cellular network comprises commencing a radio resource control (RRC) connection reestablishment procedure. This procedure comprises performing a cell selection operation wherein one or more target cells which the mobile device may select for re-establishment are specified in handover information previously received at the mobile device. A corresponding method in a network component is provided.

Abstract: The invention proposes a method and an apparatus for reducing break duration in handover of a VoIP conversation from a packet switch domain to a circuit switch domain. The main idea is that a synchronization mechanism is introduced between the session handover procedure at IP multimedia subsystem IMS layer and a cell handover procedure at layer 2, so that enable the two handover procedures to start at or almost at the same time. When a Mobile Switching Center MSC server receives a request of handover from the source Mobility Management Entity MME, the time required from the time the MSC server transmitting a message to this message arriving at a remote end user equipment UE is computed first, and then is compared with a predetermined time required from the time the MSC server transmitting a message to this message arriving at the local UE.

Abstract: A method of forwarding IP packets, sent to an old care-of-address of a mobile node, to the mobile node following a handover of the mobile node from a first old access router to a second new access router. The method comprises, prior to completion of said handover, providing said first router or another proxy node with information necessary to determine the new IP care-of address to be used by the mobile node when the mobile node is transferred to the second access router. At said first router or said proxy node, the new care-of-address for the mobile node is determined using said information and ownership of the new care-of-address by the mobile node confirmed, and subsequently packets received at said first access network and destined for said old care-of-address are forwarded to the predicted care-of-address address.

Abstract: A multi-mode mobile station includes a first interface for wireless communication with a wireless local area network (WLAN) and a second interface for wireless communication with a wireless wide area network (WWAN). A mobility server facilitates call handoffs for the multi-mode mobile station, from the WLAN to the WWAN and vice versa. The mobility server maintains an activity log for the multi-mode mobile station. When the multi-mode mobile station becomes involved in a call, the mobility server stores call information regarding the call in the activity log. During the call, the multi-mode mobile station transmits a handoff request. In response to the handoff request, the mobility server controls establishment of a bearer path for call handoff between the WLAN and the WWAN, based on the call information contained in the activity log.

Abstract: Embodiments describe a varied transmission time interval in wireless communication system. According to some embodiments is a method for assigning a transmission time interval. The method can include measuring a channel condition and/or a data rate of packet communicated by at least one wireless device. Based in part on the data rate and/or channel condition information, a determination can be made whether to schedule a long transmission time interval or a short transmission time interval to the packet. A long transmission time interval can be scheduled if the channel condition is poor and/or there is a low data rate. A short transmission time interval can be scheduled if the channel condition is good and/or the data rate is high or fast. The method can be repeated for multiple wireless devices. Also included is an alternative interlacing structure that supports both long transmission time intervals and short transmission time intervals.

Abstract: A method and system is disclosed for dynamically adjusting a signal-to-noise (SNR) bias based on relative load between a macro type base station and a micro type base station of a wireless communication system. The SNR bias corresponds to a threshold differential SNR between SNRs of the macro base station and of the micro base station, wherein the SNR bias is configured to be provided to an access terminal (or user equipment) to cause the access terminal (i) to be biased to seek service from the micro base station if the access terminal detects an SNR from the micro base station that is less than the threshold differential SNR below an SNR that the access terminal detects from the macro base station, and (ii) to be biased to seek service from the macro base station otherwise. Once the SNR bias is determined based on the relative load, it is communicated to one or more access terminals.

Abstract: A method, in a cellular radio-communication system comprising a core network and an access network, the access network comprising base stations for providing wireless links to at least one mobile station, the mobile station being capable of operating in a first transmission mode in which beamforming transmit diversity is not used and in a second transmission mode in which beamforming transmit diversity is used. The method comprises switching from the second transmission mode to the first transmission mode upon determining that at least one predetermined criterion related to the mobile station operation in soft handover is satisfied.

Abstract: An apparatus and method provides for controlling communications from multiple base stations to a mobile station in a communication system. A mobile station transmitter transmits from the mobile station channel quality indicator data of a first base station. The data is covered with Walsh code assigned to the first base station. A base station receiver receives the transmission of the channel quality indicator data of the first base station. The mobile station transmitter punctures the transmission of the channel quality indicator data of the first base station with null channel quality indicator data, and covers the null channel quality data with Walsh code assigned to a second base station of the multiple base stations to indicate a desire to switch a source of transmission of traffic data from the first base station to the second base station.

Abstract: The present invention relates to handover procedures in a cellular communications system (1). The cells (10-70) of the system (1) are divided into multiple handover-related classes based on their respective radio coverage characteristics. Each such cell class is then associated with a unique handover parameter or a unique set of parameters that are used in handover procedures involving the cells (10-70). The parameter values are adapted for the radio coverage characteristics of each cell class in order to generate a suitable handover region size of the cells (10-70). The handover parameters are used together with user equipment-assisted signal quality measurements for triggering the handover procedures.

Abstract: When a mobile device moves from a first QoS-aware system to a second QoS-aware system, QoS flows may or may not be moved properly. To deal with this, the mobile device requests de-allocation of flows in the second QoS-aware system, and then initiates reservation of flows in the second QoS-aware system. After this, the mobile device will know for certain which QoS flows exist in the second QoS-aware system and can behave accordingly.

Abstract: A method, server and terminal for providing a Voice Call Continuity (VCC) service, are discussed. According to an embodiment, the terminal includes a storage unit to store operator policy information and user preference information, the user preference information including domain selection information specifying a user-preferred domain to be used when originating the outgoing call from the terminal, the operator policy information including domain selection information specifying a network-preferred domain to be used when originating the outgoing call from the terminal; and a controller to perform a domain selection for the outgoing call based on the user preference information or the operator policy information.

Abstract: Systems, methods, devices, and computer program products are described for adaptive clustering. Serving cells may receive measurement information from mobile devices, and may each form reporting sets including measurement information for various cells. A CoMP (coordinated multi-point) control unit may receive the measurement information from each of a number of serving cells. The received measurement information may be aggregated for a population of the mobile devices. Based on the aggregated measurement information, cell clusters may be formed to perform coordinated transmissions, each including a different subset of the cells. An indication of the determined cell clusters may be transmitted to respective cells.

Abstract: Systems and methods for providing fast handoff support by transferring information are provided. Additionally, a generic protocol message format is presented which allows the transfer of information used in the handoff. The generic protocol allows a gateway to request contexts or session information and send information that allows tunnel setup and mapping to other connections. The session, tunnel, and mapping information allow the gateways to switch packet processing operations without causing disruption to the packet flow. Further, in inter-gateway handoffs or inter-access network handoffs, fast and seamless handoffs are provided so the mobile station keeps the same IP address and the session continues.

Abstract: A notification unit conveys a transmit timing of a signal to a target radio apparatus. A receiver receives the signal transmitted from the target radio apparatus with a neighborhood of the transmit timing conveyed. A demodulation unit derives a difference between the receive timing and an estimated timing. A determining unit determines a new transmit timing for the target radio apparatus, based on the difference and outputs the new transmit timing determined to the notification unit. When a state in which the receive timing lags the estimated receive timing occurs more than a predetermined frequency, the determining unit instructs the target radio apparatus to start a handover.

Abstract: A user equipment and cell search method for the same are disclosed. The user equipment supports two or more frequency bands. The cell search method for the user equipment includes: receiving intersection data through a first frequency band; and skipping, when the received intersection data is set to a search skip value, cell searching in a second frequency band.

Abstract: It is judged whether a mobile node 11 exists at a boundary A overlapped with a different sector of the base station for use in communication or at a boundary B overlapped with an area of another base station or at an area fringe C. In accordance with the application in use and the results thus judged, a handover is performed between base stations in a wireless communication system, or switching to the another wireless communication system is made, or simultaneous communication with the another wireless communication system is performed, or either the uplink or the downlink is switched to the another wireless communication system.

Abstract: Various embodiments enable a device to maintain a plurality of connections to a plurality of wireless networks simultaneously using one radio. For instance, a device can partition in time, or “time-slice”, when it transmits and receives data such that a device can maintain a plurality of connections with a plurality of networks concurrently. With the plurality of connections, the device can receive multiple copies of data. In some embodiments, a device can compare multiple copies of data and determine which copy of data is a best representation. Once a best representation has been determined, it can be selected for further usage.

Abstract: A method and a system for maintaining session continuity, in which the system includes a Handover Source Function (HOSF), a Handover Destination Function (HODF), a Handover Anchor Function-Control Plane (HOAF-CP) and a Handover Anchor Function-User Plane (HOAF-UP). The method includes a first user establishing a connection through the HOSF with the HOAF-CP and the HOAF-UP which correspond to a second user, so as to establish a session with the second user. The method further includes that, during session handover, the HODF that corresponds to the HOSF establishing another connection with the HOAF-CP and HOAF-UP though which the first user continues the session with the second user, so as to maintain the session continuity. When access address or access technology of the terminal changes, or even the terminal changes during a session, the method and the system can logically replace the connection before the handover with a new connection to ensure the session continuity.

Abstract: Disclosed is a method for performing switching between a macro evolved Node B (eNB) and a home eNB (HeNB) in a mobile communication system including broadcasting, by the HeNB, a length of an HeNB ID to a UE; notifying, by the UE, an HeNB indication information containing the length of the HeNB ID to the macro eNB; transmitting, by the macro eNB, a switching request message to a mobile station mobility management entity, the message including a target ID; finding, by the MME, the HeNB or an HeNB gateway according to the target ID, and performing a switching process from the macro eNB to the HeNB. With the described switching method for the mobile communication system, UE can move between the macro eNB and the HeNB.

Abstract: Various techniques for handing over a wireless terminal from a serving node to a target node in a radio access network is disclosed. transferring a session in a cluster are disclosed. These techniques include exchanging messages between a wireless terminal and with a serving node to support a handover to a target node. Each of the messages includes an identifier. The wireless terminal is configured to determine whether it has received any stale messages from the target node following handover based on one or more of the identifiers.

Abstract: Devices, systems and methods to schedule a service period at a wireless network. A wireless network controller of the wireless network may set a start time of a service period. The start time is no less than a predefined time after transmitting by the wireless network controller an information element containing the service period scheduling information.

Abstract: A radio communication system in which a mobile relay station includes a notification unit configured to notify the mobile station of mobility state information of the mobile relay station determined based on a number of base stations selected within a specified time, and the mobile station includes a base station selection processing unit to select the base station based on the mobility state information when the mobile station switches a device to be communicated with from the mobile relay station to the base station.

Abstract: A method and apparatus for transport format selection in a mobile wireless communication device. During a simultaneous voice and data call, the mobile wireless communication device selects a transport format for proper uplink data transmission. Simultaneous voice and data calls require higher uplink transmit power than voice only calls. The mobile wireless communication device selects a transport format based on the uplink transmit power level. At higher transmit power levels, minimum or zero data rates are chosen to maintain sufficient power for simultaneous voice. Transmit format is specified using a transmit format combination indicator.

Abstract: An access terminal establishes a session with a first radio access network (RAN). As a result, the access terminal receives a Unicast Access Terminal Identifier (UATI) assigned by the first RAN and establishes configuration settings for radio communications between the access terminal and the first RAN. The access terminal moves from the first RAN to a second RAN. Before the access terminal has a session established with the second RAN, the access terminal receives a request from a user to originate a call. In response, the access terminal sends the second RAN a connection request that includes the UATI assigned by the first RAN. The second RAN evaluates the UATI included in the connection request and determines that it was previously assigned to the access terminal by another RAN. Based on this determination, the second RAN grants the connection request by assigning a traffic channel to the access terminal.

Abstract: Wireless network system including a plurality of base stations each configured to manage active links to mobile stations within a range; and a controller configured to control the base stations to provide at least two of the active links from two different base stations simultaneously to a given mobile station in integral manner for joint processing.

Abstract: A base station may decide to initiate a handover of a communication with a mobile station from a first wireless link to a new wireless link and identify one or more wireless links for the handover. For each identified wireless link, the base station may then determine a channel-quality metric, a wireless-link loading metric, and perhaps a coverage-area loading metric. In turn, the base station may then select the new wireless link based on the channel-quality metric and one or both of the wireless-link loading metric and the coverage-area loading metric. For example, the base station may apply a linear function that includes as variables the channel-quality metric and the wireless-link loading metric, and the base station may select the identified wireless link that best satisfies this function. The base station may then facilitate the handover of the communication from the first wireless link to the selected new wireless link.

Abstract: Consistent handover can be provided between a plurality of objects by providing handover mode control information defining an object for initiating handover from among at least one object in a system environment including the at least one object, wherein the at least one object is able to initiate handover between heterogeneous networks.

Abstract: Two preamble partition schemes are provided for flexible network deployment and efficient utilization of limited cell identification resources in a wireless network. In a soft partition scheme, the entire preamble sequences are partitioned into several configurable non-overlapping subsets, and each subset is associated with a corresponding cell type. In a hybrid partition scheme, a combination of fixed and configurable subsets is used for preamble partition. The partitioning information is carried in a broadcasting channel broadcasted from base stations to mobile stations. In one embodiment, after a mobile station performs scanning and synchronization with a first base station, it derives the cell type of the first base station from cell identification and partitioning information. The mobile station completes ranging and network entry with the first base station if the cell type is preferred, and starts to perform scanning and synchronization with a second base station if the cell type is non-preferred.