Abstract: A wireless telecommunications network that uses a first frequency spectrum for wireless communications in a plurality of generally contiguous wireless coverage areas also has available a second frequency spectrum for wireless communications in a high-traffic wireless coverage area. Mobile stations in the high-traffic wireless coverage area are classified as either static or dynamic based on determinations of their speeds. The wireless telecommunications network uses the first frequency spectrum for wireless communications with dynamic mobile stations in the high-traffic wireless coverage area and uses the second frequency spectrum for wireless communications with static mobile station in the high-traffic wireless coverage area. The wireless telecommunications network may instruct the mobile stations in the high-traffic coverage area to use the appropriate frequency spectrum.

Abstract: A Base Station (BS) apparatus for estimating a velocity of a Mobile Station (MS) in a mobile communication system includes a channel estimator for performing channel estimation according to a velocity band, receiving a wireless channel signal from the MS, and performing channel estimation using channel estimation coefficients optimized for individual velocity bands; and a velocity estimator for dividing the velocity band into a plurality of sub-Doppler bands, detecting a sub-Doppler band including a frequency index having a maximum frequency response from among the divided sub-Doppler bands, and transmitting information of the detected sub-Doppler band to the channel estimator such that a channel estimation coefficient corresponding to the information is transmitted.

Abstract: A signal analyzer and a method for displaying code-channel power levels of CDMA (Code Division Multiple Access) signal that contains code changes having different spreading factors. The individual code-channel power level is measured from a received signal and displayed in a diagram for a specified base spreading factor. The code channels having an alias power level are indicated. A code channel, with regard to the specified base spreading factor, has an alias power level when the code channel having the base spreading factor is inactive and when a code channel of a higher spreading factor (corresponding to the former code channel) is active, or, in the event of orthogonal transmit diversity, the power level of a code channel is mapped onto the code channel of the base spreading factor.

Abstract: A wireless control apparatus which performs a wireless communication with a plurality of wireless terminals, comprising: an evaluation signal receiver configured to receive evaluation signals relating to received signals in the respective wireless terminals, which are transmitted from the plurality of wireless terminals; a supplement signal deciding unit which decides a supplement signal necessary to supplement the received signals in the plurality of wireless terminals; and a supplement signal transmitter configured to transmit the supplement signal decided by the supplement signal deciding unit, to the plurality of wireless terminals.

Abstract: A mobile station for communicating with a plurality of base stations, including: a field strength detecting circuit that detects a wave strength received from the base stations and outputs a received wave strength; and a base station switching control circuit that makes a comparison between the received wave strength and a first field strength threshold level, wherein, when the received wave strength is higher than the first field strength threshold level, data communication with one of the base stations which is in a connected state is performed, and when the received wave strength is lower than the first field strength threshold level, a search for base stations is performed.

Abstract: A communication zone is defined by a plurality of cells, which are separated from one another and has respective fixed base stations. The base stations in the first cell and the last cell are capable of bidirectional communication with a mobile station, while other base stations are capable of unidirectional communication. The base stations are connected to a zone control station, which controls communications with the mobile station within the zone.

Abstract: Estimating the speed of a mobile user terminal within a wireless environment and estimating the time when a mobile user terminal would reach a coverage border of the access point it is currently associated with. In particular, the present system is concerned with calculating a time (T) the terminal would take to move from a point A, after it has stopped making received signal level measurements, to another point B, at the coverage border of the access point, independently of any medium-specific parameters. This way, the present system enhances Quality of Service by properly estimating the speed and time and enabling a terminal, or an entity in the network, to take preemptive actions to ensure optimal QoS.

Abstract: The velocity of a wireless communications device (WCD) is estimated. In response to this estimated velocity, a tracking speed of a filter is determined that corresponds to the estimated velocity. The filter filters a timing error signal to produce a control signal that controls the timing of a synchronization clock. This synchronization clock may be a finger clock that controls the timing of a pseudonoise (PN) sequence generator configured for despreading a pilot symbol sequence.

Abstract: A method of and system for supporting a handover decision in a wireless communication system is described. An estimate of the position, velocity or direction of motion of a subscriber station is obtained. The estimate, or information derived there-from, is then used to support a handover decision. In one embodiment, an estimate of the velocity of the subscriber station is obtained if the handover rate experienced by the subscriber station exceeds a threshold while the subscriber station is within the coverage area of an umbrella cell. A decision is made to handover the subscriber station to the umbrella cell if the estimate of the velocity of the subscriber station exceeds a threshold. In a second embodiment, one or more estimates of the position, velocity, or direction of motion of the subscriber station are obtained responsive to the subscriber station experiencing a directed retry condition.

Abstract: A multi-slope handoff algorithm for controlling dynamic communication quality in wireless communications is proposed to let a mobile node adjust the handoff slope according to different communication connection situations for setting the optimum add/drop connection trigger thresholds. The algorithm comprises the following steps. First, a mobile node receives pilot strengths of its service pilot and nearby pilots to produce an aggregate strength. Next, the mobile node determines whether to perform handoff according to the magnitude of the aggregate strength. The handoff action is then controlled by multi-slope handoff operations to set an appropriate slope and to calculate the add/drop connection trigger thresholds when performing handoff. Finally, the pilot to be connected is selected based on the communication quality at that time. In this way, the quality of the communication service can be enhanced, the connection power consumption can be lowered, and the communication channel usage can be reduced.

Abstract: The method of optimizing performance of a mobile terminal comprising a radio communication module, a central computing unit and a plurality of data processing software components which optimizes the operation performance of the mobile terminal comprises the steps of capturing the traveling speed of the terminal from an external source, and distributing the captured speed to each of the data processing software components.

Abstract: Mobile station equipment, base station equipment, and an exchange equipped with all or some units for monitoring the speed of a mobile station, making a judgment whether or not the speed exceeds a given threshold value, and restricting both or at least one of channel control and call processing regarding a call occurring at the corresponding mobile station. These mobile station equipment, base station equipment, and exchange operate alone or associate with each other through radio transmission paths or other links. Further a mobile communication system may include these mobile station equipment, base station equipment, and exchange. In the above equipment exchange, accidents normally caused by some operation of an operator on the mobile station equipment in response to a call occurring in the mobile station equipment moving at a high speed are prevented efficiently and reliably.

Abstract: Methods and systems for providing fast handoff in WLAN-like communications system construct a caching candidate set based upon a weighted handoff tendency coefficient. The weighted handoff tendency coefficient is based upon the handoff matrix and the weighting factor. The handoff matrix is an adaptive two-dimensional array that provides a list of nearby access points relative to a mobile station and the weighting factor is a value that prioritizes the nearby access points based upon a signal quality indication. A home access point, once it is triggered to initialize proactive caching, provides the caching candidate set with registration data of the mobile station before a transfer of a connection between the home access point and one of the access points on the caching candidate set.

Abstract: The invention relates to cellular communications systems.

Abstract: The Doppler spreads of the received signals in a MIMO, SIMO or MISO mobile communication system are estimated from the derivatives of the path transfer function envelopes for the received signals. The estimated Doppler spreads is used to estimate the speed of the mobile station.

Abstract: The present invention is directed to a system for controlling, in a moving vehicle, wireless communications between a local and a remote party and more particularly to prevent any conversation in vehicles travelling above a predefined speed without cutting off wireless communication. If a wireless communication is detected and if the vehicle speed exceeds a first predefined speed limit, the wireless communication is suspended. When the vehicle speed decreases below a second predefined speed limit, the suspended wireless communication is re-established. The system comprises a wireless communication manager unit connected to both a conventional mobile communication system and a conventional free hand kit, the free hand kit being also connected to the mobile communication system.

Abstract: An apparatus, method and computer program for initiating and maintaining a virtual connection between a mobile radio and a ground station, including receiving a plurality of ground station radio signals from a mobile radio; accumulating over a time period signal quality information relative to each of the ground station radio signals; determining a signal quality parameter trend for each of the ground station radio signals as a function of the accumulated signal quality information; deciding to switch a current virtual connection between the mobile radio and a first ground station to a virtual connection between the mobile radio and a different second ground station as a function of comparing the signal quality parameter to a pre-selected minimum acceptable threshold signal quality parameter; and switching the virtual connection of the mobile radio from the first ground station to the second ground station.

Abstract: A wireless device for use in an ad hoc network is provided. The wireless device includes a transceiver, a global positioning system, and a controller. The transceiver is capable of receiving positional information from a plurality of remote users. The global positioning system is capable of generating positional information regarding the wireless device. The controller selects a first portion of the plurality of remote users to be within a pro active region of the ad hoc network based upon the positional information, and then maintains information on the remote users selected to be within the pro active region.

Abstract: The performance and ease of management of wireless communications environments is improved by a mechanism that enables access points (APs) to perform automatic channel selection. A wireless network can therefore include multiple APs, each of which will automatically choose a channel such that channel usage is optimized. Furthermore, APs can perform automatic power adjustment so that multiple APs can operate on the same channel while minimizing interference with each other. Wireless stations are load balanced across APs so that user bandwidth is optimized. A movement detection scheme provides seamless roaming of stations between APs.

Abstract: Method for improving hand-off performance in a code-division multiple access (CDMA) cellular telephone system. A preferred embodiment comprises the analysis of saved hand-off information to minimize the size of neighbor lists for each base station in the cellular telephone system. If a requested base station (for example, base station 618) is listed in any neighbor list of any base station (for example, base stations 605, 617, and 620) involved in the hand-off, then the requested base station is not added to any neighbor list. If the requested base station is not the neighbor lists of any of the base stations involved in the hand-off, then it is added to an initial base station's neighbor list (base station 605).

Abstract: The performance and ease of management of wireless communications environments is improved by a mechanism that enables access points (APs) to perform automatic channel selection. A wireless network can therefore include multiple APs, each of which will automatically choose a channel such that channel usage is optimized. Furthermore, APs can perform automatic power adjustment so that multiple APs can operate on the same channel while minimizing interference with each other. Wireless stations are load balanced across APs so that user bandwidth is optimized. A movement detection scheme provides seamless roaming of stations between APs.

Abstract: A non-instantaneous-disruption hard handover (HHO) control device includes a CFN generation block (110) for monitoring the state of a source baseband resource (201a) and a destination baseband resource (201b), generating a CFN which autonomously configures a switch timing so as to enable non-instantaneous-disruption HHO, transferring CFN information to the source baseband resource (201a) and destination baseband resource (201b). The device further includes HHO-information write-in/read-in blocks (205a, 205b) for writing radio information of the source baseband resource (201a), transferring the radio information to the destination baseband resource (201b), and enabling continuous communication by using the radio information.

Abstract: A mobile radio velocity estimation system (100) includes an autocorrelation block (106) that determines the autocorrelation of a received signal (104) using one lag (102). A power determination block (108) determines the power of the received signal (104) and a divider block (114) divides the autocorrelation (110) by the power (112). Using a Bessel function lookup table (116) and a multiplication by ?/? block (118), an estimate (120) for the mobile radio's velocity can be calculated. A method for estimating the velocity of a mobile radio (500) is also discussed.

Abstract: Disclosed is a velocity estimator using a level crossing rate. The velocity estimator comprises a power calculator for calculating power values of a signal received from a mobile terminal; a mean power calculator for calculating mean power values for M power values according to a predetermined down-sampling factor M; an interpolator for interpolating the mean power values according to a predetermined interpolation ratio L; a root mean square calculator for calculating a root mean square value using an output of the interpolator; a level crossing counter for counting a level crossing frequency representing how many times the output of the interpolator crosses a level crossing threshold determined according to the root mean square value, for a predetermined time period; and a velocity calculator for calculating a velocity estimation value of the mobile terminal using the level crossing frequency.

Abstract: Disclosed are systems and methods which provide communication links optimized with respect to particular subscriber units. Preferred embodiments utilize multiple information components with respect to the arrival of signals associated with target subscriber units in providing optimized communication links. Most preferably, direction information and information with respect to the signal spread experienced in the communication channel is used. Moreover, preferred embodiments utilize subscriber unit speed information in providing optimized communication link determinations.

Abstract: One piece of information used in setting up the optimum location registration area is an area of a peripheral cell. However, in the current system, the area of a cell is set up by the predicted number of subscribers in the area, and therefore, depends on the location. Therefore, when a mobile communication terminal computes the optimum location registration area, it is necessary to obtain the size information about the peripheral cell, which can cause the problem of traffic. The mobile communication terminal in a cell signals a plurality of paging point nodes of mobility and traffic characteristic. Then, the plurality of paging point nodes sets up a location registration area of the mobile communication terminal according to the above mentioned information and network information. Thus, the location management of the mobile communication terminal can be efficiently realized, thereby reducing the traffic.

Abstract: The present invention is related to a method for estimating a movement speed of a mobile unit in a mobile radio communication system. First, a signal from the mobile unit is received. Then, a first signal is generated by using a first filter having a first cut-off frequency to filter the signal. A first speed is obtained based on the first signal. A second signal is further generated by using a second filter having a second cut-off frequency to filter the signal. A second signal is obtained based on the second signal. Then the movement speed of the mobile unit is determined according to the first speed and the second speed.

Abstract: When performing base station selection type transmission power control, transmission of the dedicated physical control channel signal by non-transmitting base stations is halted while minimizing the impact on uplink transmission power control. This decreases downlink interference and increases downlink channel capacity. At a base station, reception quality measuring unit 506 compares the measured uplink reception quality with a target quality, forms a TPC signal on the basis of the results of this comparison, and communicates the contents of this TPC signal to transmission power controller 507. When the base station in question is a non-transmitting base station, transmission power controller 507 transmits the dedicated physical control channel signal only if the contents of the communicated TPC signal instruct a decrease, and otherwise halts transmission of the dedicated physical control channel signal.

Abstract: A mobile communication system comprises a detecting unit to detect information concerning a moving speed of a mobile terminal, and a selection controlling unit to select a use frequency in a higher frequency band when the speed information detected by the detecting unit is a higher speed, while selecting the use frequency in a lower frequency band when the detected information is a lower speed, and assigning it to the mobile terminal. In a mobile communication system in which a relationship between a terminal moving speed (Doppler frequency) and transmission quality degradation is non-monotonous, the communication quality can be improved and the channel capacity can be increased.

Abstract: Apparatus, and an associated method, for allocating channels within a cell of a cellular communication system. Allocations are made by an allocator based upon determinations made by a determiner of the likelihood of movement of the mobile station. Determinations made by the determiner are made responsive to analyses of indicia of prior movement behavior of the mobile station stored at a home location register associated with the mobile station. Channel reuse is effectuated if the mobile station is determined to be stationary or moving at a speed less than a selected threshold. Otherwise, uniquely-assigned channels are allocated to the mobile station.

Abstract: A terminal 100 detects a moving speed of the terminal 100 and discriminates if it is necessary to switch a radio link between a radio link 102 without soft handover and a radio link 103 with soft handover, when it is necessary to switch the radio link, a request to switch states with/without soft handover 106 is sent to a base station 101, the base station 101 switches the states with/without soft handover based on the request to switch states with/without soft handover 106, in addition, an instruction to switch states with/without soft handover 107 is sent to the terminal 100, and the terminal 100 switches the states with/without soft handover based on the instruction to switch states with/without soft handover 107.

Abstract: A method for handing off a call between networks includes monitoring a quality of a first link between a mobile station and a wireless local area network (WLAN) when the mobile station is actively connected with the WLAN on a call and monitoring a quality of a second link between the mobile station and a cellular network when the mobile station is actively connected with the WLAN on the call. The method also includes handing off the call from the WLAN to the cellular network when the quality of the first link is less than a handoff trigger threshold for a drop count duration and when the quality of the second link is greater than a minimum cellular link quality threshold.

Abstract: A user equipment (UE) communicates with at least one cell defining an active set. A velocity vector including position, speed, and direction is associated with the UE. A radio network controller receives information related to the velocity vector and creates a filtered neighbor cell list by filtering a neighbor cell list associated with the active set. The filtering depends on the velocity vector related information. The controller transmits the filtered neighbor cell list to the user equipment so that pilot signal strength is measured for cells in that list.

Abstract: A communication system includes a mobile terminal and a base station. The mobile terminal estimates signal quality of a forward link during a first power control group period and determines a power control bit based on the estimated signal quality. The mobile terminal further transmits the power control bit on a reverse link during the first power control group period. The base station receives the power control bit on the reverse link and modifies forward link power based on the power control bit at commencement of a second power control group period.

Abstract: The invention relates to a transmission method in a communication system. In order to devise a mechanism for providing seamless connections in an efficient way, location-dependent parameter sets are utilized, each parameter set containing at least one parameter indicative of the location of a mobile node. A group of variables associated with the mobile node is monitored, the group containing at least one variable of which at least one is derived from said parameters. The current value of said at least one variable is compared with predetermined first criteria, and a multicast-based operation mode is selected when said at least one variable meets the predetermined first criteria. In the multicast-based operation mode, data destined for the mobile node is transmitted (1) to the current access point and (2) to a set of potential new access points prior to a handover. (FIG.

Abstract: A CDMA mobile telephone allowing the drive mode to be automatically set and canceled without increasing the amount of hardware is disclosed. A frequency offset for each of N fingers is detected from despread data which are obtained by despreading received spectrum-spread data of M branches. Based on the detected N frequency offsets, it is determined whether the mobile telephone is moving at speeds higher than a predetermined speed. An operation mode of the mobile telephone switches between a drive mode and a normal mode depending on whether the mobile telephone is moving at speeds higher than the predetermined speed.

Abstract: PL demodulation section 203 demodulates pilot signals of a received signal. SIR detection section 205 detects the reception quality of the demodulated pilot signals. fd detection section 206 detects a Doppler frequency using the demodulated pilot signals. Requested modulation method deciding section 207 decides a modulation method to be requested to the base station using the reception quality of pilot signals and the detected Doppler frequency. Command generation section 208 generates a command corresponding to the decided modulation method. Adaptive demodulation section 204 performs demodulation processing on the received signal using the demodulation method corresponding to the modulation method decided by requested modulation method deciding section 207. This makes it possible to maintain good reception quality even in a fading environment.

Abstract: In a wireless communication system having sometimes mobile subscriber units and a plurality of fixed network devices located at cell sites, a multimode acquisition protocol is provided at each subscriber unit which first senses whether the subscriber unit is static or mobile from the nature and quality of the communication links with nearby network devices and then enables an acquisition protocol suited to either static mode or mobile mode. In a specific embodiment, the protocol initiates procedures to change acquisition mode from static to mobile upon failure of the subscriber unit to sense three consecutive scheduled polling packets sent by a linked network device or upon loss of communication with any locally-known network device or upon failure to transmit 25 consecutive data packets. In such case, the procedure is initiated to determine whether it is appropriate to switch to a mobile mode for purposes of acquisition.

Abstract: A mobile device, for determining location in a wireless network, includes a motion detector for detecting motion of the mobile device; a memory for storing wireless signal strength calibration data comprising a list of wireless signal strengths and known locations; a location detection module for measuring a wireless signal strength of any received network radio signals and for determining the location of the mobile device with reference to the wireless signal strength calibration data; and a location correction module, for applying a statistical correction to the measured wireless signal strength determined by the location detection module when the motion detector detects that the mobile device is moving less than a threshold amount. The mobile device may further include an orientation detector for detecting the orientation of the mobile device, which can be compared with orientation data stored in the calibration data.

Abstract: A cellular phone system, in which the probability that the deterioration of channel quality and the phenomenon of a call drop occur caused by the imperfection of the control of the changing over to the different frequency can be lowered and the channel quality can be made to be higher, is provided. A first base station communicates with a mobile communication terminal by using a first frequency, and a second base station communicates with the mobile communication terminal by using a second frequency. And while the mobile communication terminal is communicating with the first base station by using a channel, the reception quality of the second frequency is measured corresponding to the change of the quality of the channel, and the channel is changed over to the second base station corresponding to the measured reception quality and the change of the quality of the channel.

Abstract: A method and apparatus are provided for adjusting a communication receiver based on the velocity of a wireless communication device in relation to a base station. The receiver is adjusted by estimating a frequency shift of a communication signal transmitted between the base station and the wireless communication device (WCD) based on the WCD velocity. Using this estimate, adjustments are made to the communication receiver to account for the frequency shift of the communication signal. Adjustments to the receiver can include adjusting frequency and time tracking loops to account for the change in frequency of a signal received by, and from, the WCD as it moves relative to the base station. The receiver may be located in the WCD, or in the network infrastructure, or in both.

Abstract: Regulating the unnecessary handover control count and reducing the power consumption of a radio mobile station thereby reducing the load on an entire radio telecommunications system to maintain stable communications. By adding a position calculator, a direction calculator and a velocity calculator to a radio mobile station and adding the information on a radio base station and the peripheral radio base stations into report information used by the radio base station, handover control considers the position, direction, and velocity as well as the downlink communications quality according to the related art. This regulates the unnecessary handover control count and reduces the load on the entire radio telecommunications system and the power consumption of the radio mobile station.

Abstract: A processing control unit appropriately detects that a mobile communication terminal is moving at a high speed and changes criteria for reselection of a cell. When reselection of a cell occurs, the processing control unit searches a cell transition list (step S10), and determines whether or not a cell selected as a local station by the reselection of a cell has already been registered in the cell transition list (step S11). Upon determining that the cell is not registered, the processing control unit registers the cell selected as the local station in the cell transition list (step S12) and increments a variable N indicating the number of registered cells by one (step S13).

Abstract: Methods and apparatus are presented for scheduling data packet transmissions during optimal channel conditions. In one method, data packet retransmissions are scheduled for transmission during favorable channel conditions when the target remote station is moving slowly, but are scheduled for periodic transmissions when the target is moving moderately or fast. In another method, long delays for retransmissions in a channel sensitive timing scheme are eliminated. In other methods, a combination of periodic and aperiodic retransmissions are used to achieve the desired frame error rate.

Abstract: The present invention proposes a method of channel allocation for a mobile terminal (MS) moving in a cellular communication network (NW), said method comprising the steps of: detecting (S21) the speed of said mobile terminal (MS) moving in said network, and dependent on said detected speed (S23, S25), allocating (S24, S26, S27) a channel of a specific type to said mobile terminal (MS). Accordingly, with the present invention implemented, delays in neighbor cell SCH decoding and signal level measurement are significantly reduced and may thus no longer result in incomplete data for inter-cell handover decision or even unsuccessfull handovers. Hence, communication network performance in particular in connection with handovers in a cellular network layout is improved. The present invention also concerns an accordingly adapted device for channel allocation.

Abstract: The method for maximizing data throughput for cellular communications is disclosed. The invention is based upon the fact that each base station of a cell has a finite amount of transmit power and that mobile devices in different locations require transmission from the base station having varying amounts of RF signal power. The method efficiently distributes the signal power of the base station using the speed, location, and direction of the mobile device as control parameters, so more mobile devices can be serviced with increased overall system throughput. Moreover, a particular mobile device can receive signals transmitted with more than the required RF signal power, with respect to the mobile device's signal to interference ratio, to increase the data throughput of that mobile device.

Abstract: Estimating the speed of movement of a mobile terminal of a wireless communication system communicating with a base station includes calculating a normalized auto-covariance of the instantaneous power of the signal received by the mobile terminal or by the base station.

Abstract: Systems and techniques for optimizing search rate and finger assignment rate when fading is varying in order to obtain an optimum solution between better system capacity and processor utilization. A maximum search rate and finger assignment rate are used when the mobile station is moving at a slow velocity.

Abstract: A system and method for controlling operations in a cellular system is disclosed. A serving cell or the mobile telephone switching office (MTSO) determines that a portable wireless device operating in a serving cell needs to be handed off (a “handoff”). The position of the portable wireless device is determined. The position may be determined based on any of a variety of localization techniques, such as time difference of arrival (TDOA), angle of arrival (AOA), location pattern matching (LPM), global positioning system (GPS), or other localization techniques. A target cell is selected based on the position of the portable wireless device. Generally, the target cell is selected as the cell that is closest to the portable wireless device. Factors such as a position vector and/or a velocity vector may be assessed in selecting the target cell. Based on the target cell that is selected, the MTSO assigns the portable wireless device to the target cell and the transmission is handed off to the new cell.

Abstract: A method and system that enables faster acquisition of the forward link signal of a target base station in a mixed network of synchronous and asynchronous base stations is disclosed. The serving base station transmits in a neighbor list an estimated timing error 417 between the serving base station and a target base station. By utilizing the timing information, a mobile station estimates the relative time offset 408 between forward link signals received from the serving base station and signals received from the target base station. Timing information acquired during handoff enables accurate updating of the estimated timing error 417 subsequently transmitted in the neighbor lists by the base stations.