Patent application number | Description | Published |
20080220805 | POWER CONTROL MESSAGING SCHEME - In a power control messaging scheme for wireless communication, a wireless node sends vectorized information to another wireless node that uses the information to control its transmit power. In some aspects, the vectorized information may relate to interference observed at a wireless node. In some aspects, the vectorized information may relate to power adjustment offsets. In some aspects, the information may be vectorized based on one or more of different quality of service classes, different assignments within a frame, different permutation zones, different channel differences, different locations of a wireless node, different channel types, different other sector interference values, and different assignment sizes. In some aspects, a wireless node transmits a power control message via an uplink map in an assignment message. | 09-11-2008 |
20080227386 | PILOT TRANSMISSION BY RELAY STATIONS IN A MULTIHOP RELAY COMMUNICATION SYSTEM - Techniques to support multihop relay in a wireless communication system are described. In an aspect, a relay station receives data and a first pilot from an upstream station, e.g., a base station or another relay station. The relay station derives a channel estimate based on the first pilot and performs detection for the data based on the channel estimate. The relay station resends the data and sends a second pilot to a downstream station, e.g., a subscriber station or another relay station. Each pilot may be sent in accordance with a pilot format selected for that pilot. The first and second pilots may be sent using the same or different pilot formats. The relay station may receive channel information from the second station and may forward the channel information to the first station and/or select a rate for data transmission to the second station based on the channel information. | 09-18-2008 |
20080227461 | DATA TRANSMISSION AND POWER CONTROL IN A MULTIHOP RELAY COMMUNICATION SYSTEM - Techniques for transmitting data with distributed and centralized scheduling in a multihop relay communication system are described. For distributed scheduling, a relay station may generate and send first channel quality information (CQI) to a base station and receive second CQI from a subscriber station. The relay station may receive data sent by the base station based on the first CQI and may resend the data to the subscriber station based on the second CQI. For centralized scheduling, the relay station may generate first CQI for the base station, receive second CQI from the subscriber station, and send both CQIs to the base station. The relay station may receive data sent by the base station based on the first CQI and may resend the data to the subscriber station based on a scheduling decision determined based on the second CQI. Techniques for distributed and centralized power control are also described. | 09-18-2008 |
20080227477 | POWER CONTROL METHOD AND APPARATUS - Power control for wireless communication may involve determining the transmit power to be used by a wireless device. A wireless device using open loop power control may select a transmit power based on an open loop power equation where a parameter of the power equation may be based on one or more power control messages received from another wireless device. In some aspects, path loss may be estimated for open loop power control and a value for Offset_BS | 09-18-2008 |
20090023464 | Methods and Apparatus for Resolving Pilot Pseudorandom Noise Code Conflicts in a Communication System - Automated PilotPN code conflict resolution using an access point with the assistance of one or more access terminals is disclosed. An exemplary method includes determining a set of access points, as well as determining a set of PilotPN codes used by the set of access points. Detection is then made concerning whether at least two access points of the set of access points have conflicting PilotPN codes. A first PilotPN code is allocated to one of the at least two access points having conflicting PilotPN codes. Additionally, one or more other PilotPN codes, which are distinct from the first PilotPN code, are allocating to remaining access points of the at least two access points having conflicting PilotPN codes. Corresponding apparatus and other exemplary methods are also disclosed. | 01-22-2009 |
20090116389 | RESOURCE SCALING IN WIRELESS COMMUNICATION SYSTEMS - Systems and methodologies are described that facilitate resource scaling for inter-access point fairness in a wireless communication system. As described herein, an offered load of an access point can be determined based on one or more loading metrics relating to associated terminals, throughput, data rate, quality of service (QoS), or the like. Based on the determined offered load of an access point, resources used by the access point and/or power utilized for communication over those resources can be scaled based on a comparison of the offered load of the access point to a nominal or default offered load. Centralized techniques for resource scaling are described herein, wherein one or more centralized controllers coordinate resource scaling with respective access points via backhaul messaging. In addition, distributed techniques for resource scaling are described herein, wherein neighboring access points communicate with each other via over-the-air messaging to determine a local optimal resource apportionment. | 05-07-2009 |
20090124265 | ENHANCED PILOT SIGNAL - Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference. | 05-14-2009 |
20090129332 | METHODS AND APPARATUS FOR PROVIDING AN EFFICIENT FRAME STRUCTURE FOR WIRELESS COMMUNICATION SYSTEMS - Providing for an efficient frame structure for wireless communication is disclosed, which may include frequency division multiplexing (FDM) first and second air interfaces in a downlink subframe of a frame, and may also include time division multiplexing (TDM) the first and second air interfaces in an uplink subframe of the frame. | 05-21-2009 |
20090203386 | POSITIONING USING ENHANCED PILOT SIGNAL - Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference. | 08-13-2009 |
20100067599 | MIMO PREAMBLE FOR INITIAL ACCESS WITH AN UNKNOWN NUMBER OF TRANSMIT ANTENNAS - For certain embodiments, a preamble sequence associated with a particular number of transmit antennas may allow a receiving mobile station to determine the number of transmit antennas used for transmission. The preamble sequence may be selected from one of a set of Constant Amplitude and Zero Auto Correlation (CAZAC) sequences corresponding to all of the supported number of transmit antennas. As a result, a receiving station may be able to determine the sequence sent by correlation and, thereby determine the number of antennas used for transmission. Given the number of transmit antennas, the mobile station may then perform MIMO channel estimation during initial synchronization to recover the channel taps between each transmit and each receive antenna. | 03-18-2010 |
20100091739 | METHODS AND SYSTEMS FOR PRE-ALLOCATING A CQI CHANNEL DURING HANDOFF - Methods and systems for improving handover performance by pre-negotiating channel quality information between a serving base station and a target base before a handoff is initiated in a wireless communication system are described. The target base station may send to the serving base station an assigned location within an uplink subframe for a mobile station requesting a handover to the target base station to transmit channel quality information to the target base station. The serving base station may send this information to the mobile station. The mobile station may transmit channel quality information to the target base station at the assigned location. | 04-15-2010 |
20100091915 | METHODS AND SYSTEMS FOR MIMO PREAMBLE DETECTION - Certain embodiments of the present disclosure allow for detection of a transmitted preamble sequence by processing a correlation of a received signal and a preamble hypothesis in a way that exploits the good correlation properties of the known set of preamble sequences. For certain embodiments, the highest peaks of the correlation output may be compared across all preamble hypotheses to decide which preamble sequence is transmitted. | 04-15-2010 |
20100118806 | UNEQUAL MULTIPATH PROTECTION OF DIFFERENT FRAMES WITHIN A SUPERFRAME USING DIFFERENT CYCLIC PREFIX LENGTHS - Techniques for providing multipath protection of a portion of a frame classified as having a first importance level (e.g., critical) are provided. Different cyclic prefix lengths may be used, depending on whether a frame contains information deemed critical. | 05-13-2010 |
20100124184 | METHODS AND SYSTEMS WITH FRAME STRUCTURE FOR IMPROVED ADJACENT CHANNEL CO-EXISTENCE - Methods and systems are provided for supporting co-existence of two radio access technologies (RATs), which include determining the frame structure of a first RAT, including the boundary of subframes, the DL:UL subframe ratio, and switching periodicity, selecting a frame offset and a DL:UL subframe ratio in a second RAT to minimize the number of punctured symbols in the second RAT, and transmitting frames in the second RAT with the selected frame offset and subframe ratio. | 05-20-2010 |
20100135272 | METHODS AND SYSTEMS FOR LTE-WIMAX COEXISTENCE - Methods and apparatus for supporting coexistence between two different radio access technologies (RATs), such as the Long Term Evolution (LTE) standard and one of the IEEE 802.16 standards, are provided. To accomplish this coexistence, a multi-mode base station (BS) may replace transmission gaps in a frame of a first RAT with subframes or symbols of the second RAT and transmit the resulting dual-RAT frame. In this manner, a single BS may support and communicate according to two different RATs simultaneously. | 06-03-2010 |
20100177672 | SPECIAL MANAGEMENT CONNECTION BETWEEN BASE STATION AND RELAY STATIONS IN MULTIHOP RELAY SYSTEMS - The present disclosure proposes different methods of utilizing dedicated control channels in a multi-hop relay system. For one embodiment of the present disclosure, dedicated control channels may be used to power control communication entities in the multi-hop relay system. For another embodiment of the present disclosure, bandwidth resources of dedicated control channels may be employed to control a sleep mode at a subscriber station. For yet another embodiment of the present disclosure, dedicated control channels of the multi-hop relay system may be exploited for sending multicast and broadcast service messages. | 07-15-2010 |
20110007696 | METHOD AND APPARATUS FOR OIS PROTECTION IN A WIRELESS COMMUNICATION SYSTEM - Systems and methodologies are described herein that facilitate improved multi-radio coexistence between a Forward Link Only (FLO) radio and at least one non-FLO radio associated with a wireless device. As described herein, Overhead Information Symbol (OIS) transmissions scheduled by a FLO radio (such as transmissions on a dedicated OIS control channel or data transmissions containing embedded OIS information) can be given higher priority than other transmissions that collide with the OIS transmissions. In addition, transmissions scheduled by a non-FLO radio can be prioritized above respective non-OIS transmissions scheduled by a FLO radio, or alternatively non-OIS FLO transmissions can additionally be prioritized above transmissions scheduled by a non-FLO radio according to a measured amount of degradation present at the non-FLO radio. In a specific example described herein involving a Long Term Evolution (LTE) radio, degradation can be determined based on a number of successively missed Physical Uplink Control Channel (PUCCH) transmissions. | 01-13-2011 |
20110010726 | METHOD AND APPARATUS FOR ASSIGNING PRIORITIES TO COMPOSITE EVENTS - Systems and methodologies are described herein that facilitate computation of composite priorities for composite events associated with a multi-radio wireless device. As described herein, respective priority values can be assigned to composite events (e.g., radio events associated with a plurality of distinct radios) in a variety of manners. Upon assignment of priority values, a radio coexistence manager and/or other suitable means can be utilized to selectively grant respective events from among a set of events that are identified within the same time period. In various examples described herein, priorities can be computed for composite events such that relative priorities of composite events are higher if the constituent atomic events of the composite events have higher priorities, such that the relative priority of a composite event is greater than the priority of any subset of its events, and/or according to any other suitable criteria. | 01-13-2011 |
20110019649 | METHODS AND SYSTEMS FOR MOBILE STATION LOCATION DETERMINATION IN WIMAX - Certain embodiments of the present disclosure provide techniques for determining and communicating the location of a mobile station within a wireless communication system. | 01-27-2011 |
20110242969 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A user equipment (UE) monitors coexistence issues of one or more associated communication resources. The UE initiates link recovery procedures (e.g., declaring a Radio Link Failure (RLF)) in response to the monitoring when a coexistence issue is detected. The UE can also access a new channel or a new Radio Access Technology (RAT) in response to initiating the link recovery. The network may have the ability to control whether the UE can initiate the link recovery. | 10-06-2011 |
20110243047 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A method includes identifying coexistence issues among radios in a User Equipment (UE). The method also includes submitting a message to a base station that requests reconfiguring of a timing schedule of a first one of the supported radios to provide for periods of inactivity of the first one of the supported radios. The inactive periods provide operating periods for at least a second one of the supported radios. The inactive periods may be measurement gaps. | 10-06-2011 |
20110243094 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A method of wireless communication includes identifying at least one current resource for which a coexistence issue is present. The method also includes submitting a message to a base station that includes information indicative of the coexistence issue for the current resource(s). The handover request may include information indicative of the resource for which the coexistence issue is present and/or a desired future resource. | 10-06-2011 |
20110256834 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A method of wireless communication includes identifying one or more coexistence issues corresponding to a utilized set of communication resources of a User Equipment (UE). The method also includes communicating an indication of the coexistence issue(s) to a serving base station. | 10-20-2011 |
20120020229 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A method of wireless communication includes receiving signaling from a served User Equipment (UE), via a radio access technology, indicating an interfering technology associated with coexistence issues experienced by the served UE. The method also includes calculating future subframes expected to experience coexistence issues based on previous subframes estimated to have experienced coexistence issues. | 01-26-2012 |
20120030357 | METHOD AND APPARATUS TO FACILITATE VOICE ACTIVITY DETECTION AND COEXISTENCE MANAGER DECISIONS - A system and method to facilitate voice activity detection and coexistence manager decisions is provided and include identifying a connection utilizing a first resource and a content stream corresponding to the connection, where the first resource conflicts with a second resource. The content of the content stream is classified into multiple levels based on a value of the content and then a priority is assigned to the first and second resources based on the level of the content of the first resource. | 02-02-2012 |
20120034913 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - Interference between potentially conflicting radio access technologies (RATs) in a wireless device may be managed through a coexistence manager. The coexistence manager allows a first active RAT to yield conflicting resources to a second idle RAT for purposes of receiving signals to allow proper operation by the second RAT. These signals may be, for example, paging signals to a Long Term Evolution (LTE) radio or beacons to a wireless local area network (WLAN) radio. | 02-09-2012 |
20120071103 | MULTI-RADIO COEXISTENCE - A method of wireless communication includes adjusting a channel quality indicator (CQI) to compensate for coexistence interference experienced between communication resources (such as an LTE radio and a Bluetooth radio). The CQI may be set to zero, falsely indicating to a serving enhanced NodeB that a UE is out of range, thereby creating a gap in LTE operation that may be used by an alternate radio access technology. To compensate for fluctuating interference, the CQI may be adjusted to incorporate average coexistence interference over a period of time. Alternatively, the CQI at a time may incorporate coexistence interference regardless of whether interference is experienced at that specific time. A CQI value may also be boosted to compensate for a CQI backoff. CQI may be adjusted to avoid a spiral of death effect. | 03-22-2012 |
20120071106 | REDUCED TRANSMIT POWER FOR WIRELESS RADIO COEXISTENCE - In user equipments (UEs) with multiple radios, interference between those radios may be reduced by monitoring radio performance and adjusting aggressor transmit power levels to ensure victim and aggressor performance stay within desired operational levels. Various factors may determine when a reduced power approach is desired. Such factors may include aggressor transmit power, received signal strength indicator, victim error rate, throughput loss, coverage impact, etc. Various methods of reducing transmit power may be used. For example, for Long Term Evolution communications, a power headroom report may be altered to adjust a modulation coding scheme and bandwidth allocated for a particular UE. For Bluetooth communications a power control mechanism may be overridden to ensure a device stays within a desired transmit power. A power reduction loop may be employed to monitor a device's transmit power. | 03-22-2012 |
20120071185 | BUFFER STATUS REPORT CONTROL FOR CREATING TRANSMISSION GAPS - A method for wireless communication modifies an actual buffer status report value to create a modified buffer status report that is reported to a base station. The modified buffer status report value results in the base station sending fewer uplink grants to a user equipment. The fewer grants result in transmission gaps in a first radio access technology of the user equipment. The user equipment may use those transmission gaps in the first radio access technology to communicate using a second radio access technology. | 03-22-2012 |
20120093009 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - Interference between potentially conflicting radio access technologies (RATs) in a wireless device may be managed through a coexistence manager which allows communication using a first active RAT (e.g., Long Term Evolution (LTE)) and communication with a second active RAT (e.g., wireless local area network (WLAN)) when the first RAT is not scheduled for communicating during an uplink timeslot. Communications by a WLAN radio may be controlled using a power save mode. WLAN communications may be timed so that downlink signals (such as data or acknowledgement messages) to the WLAN radio are received during an inactive uplink subframe for an LTE radio. WLAN communications may also be timed so that downlink signals to the WLAN radio are received during downlink times scheduled for an LTE radio. | 04-19-2012 |
20120188907 | METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - To improve performance in devices capable of communication using multiple radio access technologies (RATs), a gap pattern may be constructed in which a first RAT is quieted during certain times to allow for a second RAT to operate without interference. Gap patterns may be constructed based on timeline constraints, such as grant scheduling and HARQ performance, or based on desired performance levels of one or more of the RATs. Gap patterns may be selected by a user equipment or base station. Gap patterns may be selected to protect information in certain subframes. Potential gap patterns may be assigned weights indicating their desirability. | 07-26-2012 |
20120243473 | MULTI-RADIO COEXISTENCE - A method of wireless communication includes determining denial rates for first and second communication attempts of a packet using a first communication resource (e.g., an LTE radio). The method also includes allowing a second communication resource (e.g., a Bluetooth radio) to communicate when communication attempts from the first communication resource are denied. The denial rates are chosen to achieve threshold levels of performance for the first and second communication resources. The second denial rate may be set and the first denial rate adjusted in a looped manner to achieve desired Bluetooth performance. The denial rates may be set to deny all first communication attempts but to allow all second communication attempts. Final attempts to transmit Bluetooth packets may be given priority regardless of the first and second denial rates. | 09-27-2012 |
20120263032 | METHODS AND APPARATUS FOR RESOLVING IDENTIFIER CONFLICTS IN A COMMUNICATION SYSTEM - Apparatus and methods of allocating identifiers in a communication system include receiving, at a first access point, a set of physical layer identifiers used by a plurality of access points, with assistance from an access terminal. The apparatus and methods further include detecting, relative to one of the plurality of access points, a conflicting physical layer identifier. Additionally, the apparatus and methods include selecting, at the first access point, a first physical layer identifier distinct from the conflicting physical layer identifier. | 10-18-2012 |
20120307749 | CONFIGURABLE FILTER FOR MULTI-RADIO INTERFERENCE MITIGATION - In a multi-radio device, a configurable filter may be placed on the transmit side of an aggressor radio to reduce interference to receive side performance of a victim radio. The filter may be adaptively configured based on performance of the victim radio. The configurable filter may be in the form of a notch filter. The depth and width of the notch filter may be configured. The filter may be used to create a virtual guard band between an Industrial Scientific and Medical (ISM) band and a cellular band by puncturing a physical uplink control channel (PUCCH) transmission nearest to the ISM band or reducing power on the nearest PUCCH transmission. | 12-06-2012 |
20130021983 | FACILITATING USER EQUIPMENT FEEDBACK TO MANAGE RATE LOOP AT A BASE STATION - A method of wireless communication includes denying time or frequency resources of a first radio access technology (RAT) to allow communications of a second RAT. Information is reported about the denied resources of the first RAT to facilitate a connection setup on one of the first RAT and the second RAT. | 01-24-2013 |
20130083712 | DISCONTINUOUS RECEPTION (DRX) BASED MECHANISMS FOR CONNECTION SETUP - A user equipment (UE) may detect a potential collision between a discontinuous reception (DRX) pattern of a first radio access technology (RAT) and a reception time of a message from a second RAT of a remote device. The reception time may be unknown. The UE may dynamically reconfigure the DRX pattern to reduce a likelihood of the potential collision. The UE may also configure transmission of a different message by the second RAT during a DRX off-period to reduce a likelihood of the potential collision. | 04-04-2013 |
20130176877 | DETECTING BURSTY INTERFERENCE TO TRIGGER A COEXISTENCE INDICATION - A user equipment (UE) may reduce coexistence issues with one or more radio access technologies (RATs) caused by a bursty interference. The bursty interference may be detected by detecting a number of modes in a measured signal sample and determining when a signal contains a multi-modal distribution based at least in part on the detecting. A coexistence indication is created based at least in part on the determining. | 07-11-2013 |
20130188507 | DATA TRANSMISSION AND POWER CONTROL IN A MULTIHOP RELAY COMMUNICATION SYSTEM - Techniques for transmitting data with distributed and centralized scheduling in a multihop relay communication system are described. For distributed scheduling, a relay station may generate and send first channel quality information (CQI) to a base station and receive second CQI from a subscriber station. The relay station may receive data sent by the base station based on the first CQI and may resend the data to the subscriber station based on the second CQI. For centralized scheduling, the relay station may generate first CQI for the base station, receive second CQI from the subscriber station, and send both CQIs to the base station. The relay station may receive data sent by the base station based on the first CQI and may resend the data to the subscriber station based on a scheduling decision determined based on the second CQI. Techniques for distributed and centralized power control are also described. | 07-25-2013 |
20130194994 | MULTI-RADIO COEXISTENCE - A user equipment (UE) may manage coexistence between multiple radio access technologies (RATs) utilized by the UE to allow a first RAT to be active during times when communications of a second RAT of the UE are inactive. In some instances, the UE may indicate discontinuous reception (DRX) operation of the UE to allow for time-division multiplexed (TDM) operation between the first RAT and the second RAT. The UE may set a hybrid automatic repeat request (HARQ) configuration to allow for a HARQ retransmission of a packet of the first RAT, originally received in a first DRX cycle, during a second DRX cycle. | 08-01-2013 |
20130217401 | POSITIONING USING ENHANCED PILOT SIGNAL - Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference. | 08-22-2013 |
20130242780 | VIRTUAL GAP PATTERNS WITH MULTI-RADIO COEXISTENCE FOR PROTECTED MEASUREMENTS - A user equipment (UE) may mitigate coexistence issues in multi-radio devices, where significant in-device coexistence problems can. The UE determines at least one potential virtual gap pattern configuration for a first radio access technology (RAT). The UE also selects one of the at least one potential gap pattern configuration based at least in part on protecting subframes which are used by the first RAT to perform clean signal reference measurements and/or based at least in part on performance of the second RAT. Further, the UE quiets transmit activities of a second RAT during protected subframes of the first RAT in the determined potential virtual gap pattern configuration. | 09-19-2013 |
20130279355 | MULTI-RADIO COEXISTENCE - A method for wireless communications includes determining a time division duplex (TDD) configuration of a non-serving network. The method also includes detecting interference from the non-serving network based at least in part on the TDD configuration of the non-serving network. The method further includes signaling an eNodeB of the interference based at least in part on the detecting. | 10-24-2013 |
20140126552 | AUTONOMOUS DENIAL CONFIGURATIONS FOR MULTI-RADIO COEXISTENCE - To manage in-device coexistence between multiple radios for different radio access technologies (RATs) on a wireless device, an autonomous denial rate may be specified for the wireless device from a base station of a first RAT. The communications for a second RAT of the wireless device may then be adjusted based on the autonomous denial rate. The wireless device may also request TDM or FDM communication configurations for the first RAT to manage communications. Measurement reporting may be scheduled around denied uplink subframes of the first RAT. | 05-08-2014 |