Patent application number | Description | Published |
20100056215 | DISTRIBUTED DOWNLINK COORDINATED MULTI-POINT (CoMP) FRAMEWORK - Systems and methodologies are described that facilitate dynamically forming clusters in a wireless communication environment. A set of non-overlapping clusters can be formed dynamically over time and in a distributed manner. Each of the clusters can include a set of base stations and a set of mobile devices. The clusters can be yielded based upon a set of local strategies selected by base stations across the network converged upon through message passing. For example, each base station can select a particular local strategy as a function of time based upon network-wide utility estimates respectively conditioned upon implementation of the particular local strategy and disparate possible local strategies that can cover the corresponding base station. Moreover, operation within each of the clusters can be coordinated. | 03-04-2010 |
20100085917 | METHOD AND APPARATUS FOR COOPERATION STRATEGY SELECTION IN A WIRELESS COMMUNICATION SYSTEM - Systems and methodologies are described that facilitate cooperation strategy selection for a network multiple-in-multiple-out (N-MIMO) communication system. As described herein, one or more nodes in a communication system capable of N-MIMO communication can calculate marginal utilities, projected per-user rates, and/or other parameters corresponding to respective associated users. Based on these calculations, respective network nodes can perform user scheduling and selection, cell scheduling and selection, selection of a cooperation strategy (e.g., coordinated silencing, joint transmission, coordinated beamforming, etc.), and/or other operations to provide cooperative communication for respective users. As further described herein, projected rate calculation for a given user can be adjusted based on processing or channel implementation loss associated with the user, interference nulling capability of the user, or other factors. As additionally described herein, these and/or other parameters can be fed back by respective users to a serving network node and/or mandated via system performance requirements. | 04-08-2010 |
20100144334 | LIST ELIMINATION FOR DISTRIBUTED DOWNLINK COORDINATED MULTI-POINT (CoMP) FRAMEWORK - Providing for record filtering in distributed dynamic clustering algorithms for coordinated multipoint (CoMP) wireless communication is described herein. By way of example, strategy selection records distributed as part of a belief propagation network are pruned at recipient nodes, thereby reducing processing overhead for dynamic clustering. As a result, cooperative policies can be determined with greater efficiency, and with greater relevance to local clusters of cooperating base stations. In some aspects, record pruning can comprise identifying and discarding redundant or incompatible sets of policy decisions. In at least one aspect, a number of evaluated records can be capped based on relevance, while preserving deployment-wide applicability of the belief propagation network. Accordingly, dynamic distributed CoMP decisions are optimized on a deployment-wide scale that more efficiently converges to maximum utility solutions. | 06-10-2010 |
20110228666 | METHOD AND APPARATUS FOR ESTABLISHING AND MAINTAINING PEER-TO-PEER (P2P) COMMUNICATION ON UNLICENSED SPECTRUM - Techniques for establishing and maintaining peer-to-peer (P2P) communication are described. In an aspect, P2P communication on an unlicensed spectrum may be established and maintained with network assistance. In one design, a user equipment (UE) may communicate with a wide area network (WAN) to establish P2P communication with at least one other UE on a first frequency band that is not licensed to the WAN. For example, the UE may receive an assignment of at least one frequency channel in the first frequency band for P2P communication. The UE may then communicate peer-to-peer with the other UE(s) on the at least one frequency channel. The UE may also communicate with the WAN to maintain P2P communication with the other UE(s), e.g., to switch to another frequency channel if necessary. | 09-22-2011 |
20110237272 | Multi-point equalization framework for coordinated multi-point transmission - Providing for a multipoint equalization (MPE) framework for coordinated multipoint (CoMP) transmission in wireless communication is described herein. The disclosed MPE framework involves distributed scheduling decisions for CoMP transmission, reducing complexity of scheduling coordination as compared with centralized scheduling techniques that coordinate scheduling decisions for multiple network base stations. Further, the MPE framework involves distributed computation of CoMP transmission coefficients, relying on a maximum of two backhaul hops to obtain information for the computation, and disseminate the transmission coefficients. The disclosed MPE framework shows substantial gains in various network deployments over conventional CoMP techniques. | 09-29-2011 |
20110249584 | PERIODIC CQI REPORTING IN A WIRELESS COMMUNICATION NETWORK - According to certain aspects, techniques for aperiodically reporting channel state information (CSI) on protected and unprotected resources are provided. The protected resources may include resources in which transmissions in a first cell are protected by restricting transmissions in a second cell. According to certain aspects, a request for channel quality indicator (CQI) may be sent in a first subframe, CQI may be measured for a second subframe having a first offset from the first subframe, and a corresponding CQI report sent in a third subframe having a second offset from the first subframe. | 10-13-2011 |
20110249643 | CHANNEL STATE INFORMATION REPORTING IN A WIRELESS COMMUNICATION NETWORK - According to certain aspects, techniques for periodically reporting channel state information (CSI) on protected and unprotected resources are provided. The protected resources may include resources in which transmissions in a first cell are protected by restricting transmissions in a second cell. | 10-13-2011 |
20110250913 | RANDOM ACCESS PROCEDURE ENHANCEMENTS FOR HETEROGENEOUS NETWORKS - Certain aspects of the present disclosure provide various mechanisms that allow a user equipment to convey information regarding one or more attributes to a base station during a random access (RA) procedure. The attributes may include, for example a capability of the UE (e.g., to support a particular feature or version of a standard) or a condition of the UE (e.g., if it is currently experiencing an interference condition). | 10-13-2011 |
20110250919 | CQI ESTIMATION IN A WIRELESS COMMUNICATION NETWORK - Techniques for estimating and reporting channel quality indicator (CQI) are disclosed. Neighboring base stations may cause strong interference to one another and may be allocated different resources, e.g., different subframes. A UE may observe different levels of interference on different resources. In an aspect, the UE may determine a CQI for resources allocated to a base station and having reduced or no interference from at least one interfering base station. In another aspect, the UE may determine multiple CQI for resources of different types and associated with different interference levels. For example, the UE may determine a first CQI based on at least one first subframe allocated to the base station and having reduced or no interference from the interfering base station(s). The UE may determine a second CQI based on at least one second subframe allocated to the interfering base station(s). | 10-13-2011 |
20110286346 | MEASUREMENT OF RECEIVED POWER AND RECEIVED QUALITY IN A WIRELESS COMMUNICATION NETWORK - Certain aspects of the present disclosure provide techniques and apparatuses for wireless communications. According to certain aspects, a set of protected resources, allocated to a base station of a first cell, that are protected by restricting transmissions of a second cell is determined and received power of a first reference signal from the base station in the set of resources is measured. According to certain aspects, a subset of one or more neighbor base stations that have reduced interference in a set of protected resources is determined and received power measurements for the subset of neighbor cells is excluded when calculating receive signal quality measurements for the subframe. | 11-24-2011 |
20110292823 | SOUNDING REFERENCE SIGNAL (SRS) IN HETEROGENEOUS NETWORK (HETNET) WITH TIME DIVISION MULTIPLEXING (TDM) PARTITIONING - Methods and apparatus for uplink (UL) radio link monitoring (RLM) in a Long Term Evolution (LTE) heterogeneous network (HetNet) with enhanced inter-cell interference coordination (eICIC) are described. Various options are presented in an effort to transmit a sounding reference signal (SRS) of a user equipment device (UE) served by a Node B in the HetNet, avoiding both interference from UL transmissions from other UEs being served by neighboring Node Bs and collisions with the UE's own channel quality information (CQI) or physical uplink shared channel (PUSCH), for example. | 12-01-2011 |
20110306350 | METHOD AND SYSTEM FOR RATE PREDICTION IN COORDINATED MULTI-POINT TRANSMISSION - A downlink cooperative multi-point (CoMP) framework of a wireless communication system reduces inter-node interference and increases channel gain by scheduling a user equipment (UE) based on improved interference estimates and gain estimates. The UE computes a gain scaling factor (μ) based on theoretical gain and actual gain for each available scheduling scenario and transmits the gain scaling factors to an anchor node of the UE's radio reporting set (RRS). The anchor node computes an internal scaling factor (ν) based on the received gain scaling factors (μ) to estimate an actual gain for the scheduling scenarios. The UE also periodically transmits quantized interference estimates to the anchor node. The anchor node predicts a rate for the scheduling scenarios and schedules the UE based on the internal scaling factor (ν), the gain scaling factors (μ), and the interference estimates. | 12-15-2011 |
20110310802 | ADAPTIVE RESOURCE PARTITIONING INFORMATION (ARPI) TRANSITION BEHAVIOR IN HETEROGENEOUS NETWORKS - One aspect discloses transition behavior of dynamically changing subframe interlaces and the corresponding behavior of the bases stations during the changing. A method of wireless communication includes receiving a request to dynamically change a subframe interlace. The subframe interlace is transitioned and during the transition either new data transmission is prevented on the prohibited subframe interlace and/or retransmissions are allowed on the prohibited subframe interlace. | 12-22-2011 |
20110312358 | Channel Quality Reporting for Different Types of Subframes - A method for determining channel quality estimates of two or more types of subframes, such as clean and unclean subframes, may be applicable to both legacy and newer user equipment. A first base station affects a channel quality measurement by either transmitting dummy signals over designed tones that correspond to a second base station, or by puncturing transmissions during designated tones that correspond to the second base station. | 12-22-2011 |
20120026940 | RADIO REPORTING SET AND BACKHAUL REPORTING SET CONSTRUCTION FOR COORDINATED MULTI-POINT COMMUNICATION - Systems, methods, apparatus and articles of manufacture are disclosed for constructing radio reporting sets and backhaul reporting sets for coordinated multi-point transmission in a wireless communication network. | 02-02-2012 |
20120039183 | METHOD AND APPARATUS FOR FACILITATING SENSING IN COGNITIVE RADIO COMMUNICATIONS - Techniques are provided for the suppression of reference signal transmissions to enable sensing in cognitive radio communications. In one example, there is provided a method, operable by a network entity (e.g., evolved Node B), that may involve communicating with another network entity to determine parameters of a quiet period, the parameters comprising at least one of when the quiet period occurs and duration of the quiet period. The method may involve transmitting a reference signal in a first channel exclusively during a first plurality of subframes of a first frame period, wherein the first frame period further includes a quiet period during which no signals are transmitted, and performing during the quiet period a sensing operation with respect to the first channel. | 02-16-2012 |
20120039284 | METHOD AND APPARATUS FOR USE OF LICENSED SPECTRUM FOR CONTROL CHANNELS IN COGNITIVE RADIO COMMUNICATIONS - Techniques are provided for control signaling and channel selection in cognitive Long Term Evolution (LTE). In one example, there is provided a method, operable by a mobile entity, that involves receiving, on a licensed channel, broadcasted channel usage information regarding at least one unlicensed channel used by one or more network nodes. The method further involves: performing a cell search procedure based at least in part on the channel usage information to select a given network node among the one or more network nodes; determining at least one random access parameter to be used in establishing wireless communication with the given network node, the at least one random access parameter being associated with a characteristic of the user device and determining a preferred downlink channel. | 02-16-2012 |
20120063383 | METHODS AND APPARATUS FOR BEST-EFFORT RADIO BACKHAUL AMONG CELLS ON UNLICENSED OR SHARED SPECTRUM - Methods and apparatus for wireless communication are described. A first base station may provide first backhaul information using a shared channel to a second base station. The shared channel may be white space channels, Authorized Shared Multiuser (ASM) channels or an Instrumentation, Scientific, and Measurement (ISM) channels. The first base station may further provide second backhaul information using a legacy backhaul channel. | 03-15-2012 |
20120076025 | REPORTING OF CHANNEL PROPERTIES IN HETEROGENEOUS NETWORKS - Rank indicator and channel quality indicator (CQI) estimation and reporting functionalities are discussed with regard to heterogeneous networks to reduce the number of inconsistent CQI estimates transmitted to an evolved node B (eNB), where the CQI is defined as inconsistent when the rank indicator, on which the CQI is conditioned, is from a different subframe type than the subframe on which the CQI is to be estimated. | 03-29-2012 |
20120093095 | METHOD AND APPARATUS FOR SUPPORTING COMMUNICATIONS IN A HETEROGENEOUS NETWORK - A method, an apparatus, and a computer program product for wireless communication are provided in which an apparatus may determine broadcast channel scheduling information for one or more broadcasts of a payload by a broadcast channel associated with a first base station based on one or more broadcast channel interference coordination schemes, wherein reception of the broadcast channel associated with the first base station is interfered at least in part based on one or more transmissions from a second base station, and receive the payload based on the determined broadcast channel scheduling information. | 04-19-2012 |
20120093096 | SEMI-PERSISTENT SCHEDULING GRANTS IN HETEROGENEOUS NETWORKS - Time division multiplexing (TDM) partitioning is one of the inter-cell interference coordination (ICIC) mechanisms considered for a heterogeneous network (HetNet) ICIC in a co-channel deployment. For example, in subframes that are pre-allocated to an evolved Node B (eNB), neighbor eNBs may not transmit, hence interference experienced by served user equipments (UEs) may be reduced. Semi-persistent scheduling (SPS) grants may have various available periodicities, which may not be compatible with TDM partitioning. Therefore, a UE may miss an SPS opportunity that was scheduled for a subframe that was not usable by the UE. Hence, using SPS grants with small periodicities in a heterogeneous network with TDM partitioning may require changes which may include adjusting the periodicities of the SPS grants, rescheduling of uplink SPS messages based on resource partitioning information (RPI), and/or determining RPI based on current SPS grants. | 04-19-2012 |
20120122477 | GEO-LOCATION AIDED SENSING - There lies a challenge to develop a technique of accurately and efficiently determining an available communication channel. In accordance with some embodiments disclosed herein, techniques for sensing a primary user of a particular communication channel are performed more efficiently. In some implementations, a geo-location of a communication device is combined with a sensing algorithm in order to more efficiently perform spectrum sensing. In some implementations, a geo-location and an accuracy determination may be used to determine all required sample regions in order to ensure that a primary user is not present in a particular location. | 05-17-2012 |
20120207025 | METHODS AND APPARATUS FOR EVALUATING NUMBER OF PROTECTED ACTIVE USERS BASED ON QOS REQUIREMENTS, THROUGHPUT AND TRAFFIC - Certain aspects of the present disclosure propose methods and apparatus to transmit information about number of active UEs in a cell (e.g., pico cell) that need protection to an interfering cell (e.g., a macro cell). The information may be transmitted in a resource status update message. The active users may be defined as users whose downlink performance and/or quality of service are limited by the available number of protected resources. | 08-16-2012 |
20120218954 | MULTI-CARRIER OPERATIONS WITH FAST FREQUENCY HOPPING - A method of wireless communication includes receiving by a single RF receiver of a user equipment (UE) a first portion of a downlink transmission from an eNode B (eNodeB) on a downlink primary carrier during at least one periodic subframe of the downlink primary carrier. The method also includes receiving by the single RF receiver a second portion of the downlink transmission from the eNodeB on the secondary downlink carrier. The reception occurs during a periodic sequence of subframes of the secondary downlink carrier following the at least one periodic subframe of the downlink primary carrier and before a second periodic subframe of the downlink primary carrier. | 08-30-2012 |
20120243488 | METHODS AND APPARATUS FOR EFFECTIVE ALLOCATION OF ADAPTIVE RESOURCE PARTITIONING INFORMATION (ARPI) TO PICO ENHANCED NODE B BY MACRO ENHANCED NODE B IN HETEROGENEOUS NETWORK - Methods and apparatus for effectively allocating resource partitioning information (RPI) in a wireless communication network are provided. For certain aspects, a method for wireless communications generally includes receiving, at a first base station, such as a pico enhanced Node B (eNB), resource partitioning information (RPI) from at least one second base station, such as a macro eNB; determining one or more resources indicated in the RPI actually usable by the first base station; and sending, from the first base station to the at least one second base station, an indication of the actually usable resources. | 09-27-2012 |
20120275322 | METHOD AND APPARATUS FOR RESTRICTED MEASURING IN A WIRELESS NETWORK - Methods and apparatuses are provided that include determining resources over which to measure signals from a base station. One or more parameters related to a resource restriction pattern can be provided to the device for measuring signals over indicated resources. The resource restricted pattern can correspond to a bitmap where each bit relates to a time period over which signals can be transmitted by the base station, and the bit can specify whether a signal received over the resource should be measured. The resource restriction pattern can correspond to a set or protected resources negotiated using a resource partitioning scheme. | 11-01-2012 |
20130003533 | PRE-AGREED RADIO LINK FAILURE RECOVERY CHANNEL SEQUENCE - A method of wireless communication is provided. The method includes transmitting a message to notify a base station of a radio link failure on a current channel, retuning to a pre-agreed channel, and setting a time period to synchronize with the base station on the pre-agreed channel. | 01-03-2013 |
20130010687 | SYNCHRONIZED UPLINK-DOWNLINK HOP FOR MEASUREMENTS - A method of wireless communication is provided which includes communicating with a base station on a first channel and tuning to a second channel concurrently with the base station tuning to a second or third channel. The method also includes measuring interference on the second channel and re-tuning to the first channel concurrently with the base station re-tuning to the first channel. The method further includes reporting channel quality, based on the interference, to the base station to enable channel selection. | 01-10-2013 |
20130033989 | ENHANCED DOWNLINK RATE ADAPTATION FOR LTE HETEROGENEOUS NETWORK BASE STATIONS - Downlink rate adaptation in wireless communication systems are disclosed in which a UE reports RIs for both interference-free and interference-limited subframes. In general, the RI for the interference-free subframes will be higher than the RI reported for the interference-limited subframes. However, an eNB selects an RI and a transmission rate for interference-limited subframes based on what the UE can sustain instead of based only on the RI reported by the UE. | 02-07-2013 |
20130039171 | METHODS AND APPARATUSES FOR FREQUENCY SPECTRUM SHARING - Techniques are provided for frequency spectrum sharing that allows secondary operators to access a frequency band of a primary operator without interfering with the primary operator's use of the band, while ensuring service continuity for devices of the secondary operators. For example, there is provided a method that may involve identifying an outage on a first channel of a plurality of channels of a spectrum, wherein each of the plurality of channels is allocated to one of a plurality of operators. The method may involve migrating all mobile stations in communication over the first channel of the plurality of channels to at least one other channel of the plurality of channels during the outage. | 02-14-2013 |
20130051321 | MULTIPLE DESCRIPTION CODING (MDC) FOR CHANNEL STATE INFORMATION REFERENCE SIGNALS (CSI-RS) - Aspects of the present disclosure include a wireless system to reduce quantization error due to codebook-based PMI reporting by precoding channel state information reference signals (CSI-RSs) via a base station. The eNodeB varies the properties for a CSI-RS transmission in a known pattern and receives varying reports from the UE. The eNodeB can reconstruct the PMI with improved accuracy by combining multiple consecutive reports. | 02-28-2013 |
20130051322 | MULTI-POINT PUCCH ATTACHMENT - Various aspects of the present disclosure are directed to periodic over-the-air channel state information (CSI) reporting to serving cells and one or more non-serving cells via a control channel multi-point attachment. The channel state information report may be transmitted based on information indicating how to transmit the channel state information report to the non-serving cell. The information indicating how to transmit the channel state information report may be provided by the serving eNodeB. The information may include a periodicity, offset parameters, timing advance commands, power control commands, and/or an aperiodic report request. | 02-28-2013 |
20130053077 | USER EQUIPMENT ENHANCEMENTS FOR COOPERATIVE MULTI-POINT COMMUNICATION - Certain aspects of the present disclosure provide techniques for measuring interference observed at a CoMP UE caused by neighbor base stations transmitting reference signals. | 02-28-2013 |
20130053078 | BACKHAUL ENHANCEMENTS FOR COOPERATIVE MULTI-POINT (COMP) OPERATIONS - Certain aspects of the present disclosure relate to techniques for backhaul enhancements for cooperative multi-point (CoMP) operations. An aggressor node may take pre-scheduling decisions in advance of beamformed data transmissions based on the pre-scheduling decisions. The aggressor node may communicate the pre-scheduling decisions to one or more victim nodes, for example, via a backhaul link between the aggressor node and the one or more victim nodes. A victim node may take scheduling decisions based at least on the pre-scheduling decisions of the aggressor node to coordinate beamformed transmissions from the victim node with the beamformed transmissions from the aggressor node. | 02-28-2013 |
20130070626 | METHOD AND APPARATUS FOR CHANNEL DISCOVERY IN COGNITIVE RADIO COMMUNICATIONS - Techniques are provided for channel discovery. For example, there is provided a method operable by a mobile entity that may involve measuring beacon signals associated with the network. In one approach, the method may involve, in response to detecting an Authorized Shared Access (ASA) beacon signal on a frequency common to each network entity on a given ASA channel, extracting frequency information from the ASA beacon signal, wherein the ASA beacon signal comprises a single frequency network (SFN) beacon signal. In another approach, the method may involve, in response to detecting an ASA beacon signal on a frequency common to each network entity on a given ASA channel, extract frequency information from the ASA beacon signal, wherein timing correlates with an operating frequency for the ASA beacon signal. | 03-21-2013 |
20130100834 | INCREASING CSI-RS OVERHEAD VIA ANTENNA PORT AUGMENTATION - A method of wireless communication is presented. The method includes signaling a first number of channel state information-reference signal (CSI-RS) ports corresponding to resource elements (REs) and a second number of virtual antenna ports, the second number being less than or equal to the first number. The method also includes transmitting CSI-RS on each virtual antenna port, the CSI-RS mapped to at least a portion of the REs. | 04-25-2013 |
20130121272 | METHOD AND APPARATUS FOR DYNAMIC FREQUENCY SELECTION IN WIRELESS COMMUNICATIONS - Techniques are provided for dynamic frequency selection (DFS). For example, there is provided a distributed DFS method that may involve receiving a measurement report from each associated mobile entity, the measurement report comprising channel quality metrics for each mobile entity on corresponding frequency channels, the frequency channels comprising at least one unlicensed channel. The method may involve determining link quality metrics for the frequency channels based at least in part on the channel quality metrics in the measurement report. The method may involve selecting at least one operating channel corresponding to a maximum link quality metric among the link quality metrics. The method may involve implementing a time delay before starting operation on the selected at least one operating channel. | 05-16-2013 |
20130155973 | MULTI-HYPOTHESIS CHANNEL QUALITY INDICATOR FEEDBACK - A method for providing multi-hypothesis channel quality indicator (MH-CQI) feedback is described. Hypotheses corresponding to rank indicator (RI) and precoding matrix indicator (PMI) assumptions associated with a dominant interferer are selected. Multi-hypothesis channel quality indicator (MH-CQI) values based on the selected hypotheses are generated. The multi-hypothesis channel quality indicator (MH-CQI) values are encoded. The multi-hypothesis channel quality indicator (MH-CQI) values are sent as feedback. | 06-20-2013 |
20130229935 | METHOD AND APPARATUS FOR COOPERATION STRATEGY SELECTION IN A WIRELESS COMMUNICATION SYSTEM - Systems and methodologies are described that facilitate cooperation strategy selection for a network multiple-in-multiple-out (N-MIMO) communication system. As described herein, one or more nodes in a communication system capable of N-MIMO communication can calculate marginal utilities, projected per-user rates, and/or other parameters corresponding to respective associated users. Based on these calculations, respective network nodes can perform user scheduling and selection, cell scheduling and selection, selection of a cooperation strategy (e.g., coordinated silencing, joint transmission, coordinated beamforming, etc.), and/or other operations to provide cooperative communication for respective users. As further described herein, projected rate calculation for a given user can be adjusted based on processing or channel implementation loss associated with the user, interference nulling capability of the user, or other factors. As additionally described herein, these and/or other parameters can be fed back by respective users to a serving network node and/or mandated via system performance requirements. | 09-05-2013 |
20130294275 | DISTRIBUTED DOWNLINK COORDINATED MULTI-POINT (CoMP) FRAMEWORK - Systems and methodologies are described that facilitate dynamically forming clusters in a wireless communication environment. A set of non-overlapping clusters can be formed dynamically over time and in a distributed manner. Each of the clusters can include a set of base stations and a set of mobile devices. The clusters can be yielded based upon a set of local strategies selected by base stations across the network converged upon through message passing. For example, each base station can select a particular local strategy as a function of time based upon network-wide utility estimates respectively conditioned upon implementation of the particular local strategy and disparate possible local strategies that can cover the corresponding base station. Moreover, operation within each of the clusters can be coordinated. | 11-07-2013 |
20130301458 | CHANNEL QUALITY REPORTING FOR DIFFERENT TYPES OF SUBFRAMES - A method for determining channel quality estimates of two or more types of subframes, such as clean and unclean subframes, may be applicable to both legacy and newer user equipment. A first base station affects a channel quality measurement by either transmitting dummy signals over designed tones that correspond to a second base station, or by puncturing transmissions during designated tones that correspond to the second base station. | 11-14-2013 |
20130343273 | ENHANCED TTI BUNDLING WITH FLEXIBLE HARQ MERGING - A method, an apparatus, and a computer program product for wireless communication are provided in which mandated retransmission of data packets according to a compressed timeline provide an alternative to TTI bundling. A first data unit is transmitted in a first subframe and automatically retransmitted in one or more non-consecutive subframes before a response to a preceding transmission or retransmission of the first data unit has been processed. The retransmissions are terminated after an acknowledgement is processed. The automatic retransmissions occur periodically with a predetermined number of intervening subframes transmitted before each retransmission of the first data unit. | 12-26-2013 |
20130343355 | SEMI-PERSISTENT SCHEDULING GRANTS IN HETEROGENEOUS NETWORKS - Time division multiplexing (TDM) partitioning is one of the inter-cell interference coordination (ICIC) mechanisms considered for a heterogeneous network (HetNet) ICIC in a co-channel deployment. For example, in subframes that are pre-allocated to an evolved Node B (eNB), neighbor eNBs may not transmit, hence interference experienced by served user equipments (UEs) may be reduced. Semi-persistent scheduling (SPS) grants may have various available periodicities, which may not be compatible with TDM partitioning. Therefore, a UE may miss an SPS opportunity that was scheduled for a subframe that was not usable by the UE. Hence, using SPS grants with small periodicities in a heterogeneous network with TDM partitioning may require changes which may include adjusting the periodicities of the SPS grants, rescheduling of uplink SPS messages based on resource partitioning information (RPI), and/or determining RPI based on current SPS grants. | 12-26-2013 |
20140119320 | RANDOM ACCESS PROCEDURE ENHANCEMENTS FOR HETEROGENEOUS NETWORKS - Certain aspects of the present disclosure provide various mechanisms that allow a user equipment to convey information regarding one or more attributes to a base station during a random access (RA) procedure. The attributes may include, for example a capability of the UE (e.g., to support a particular feature or version of a standard) or a condition of the UE (e.g., if it is currently experiencing an interference condition). | 05-01-2014 |
20140204782 | INTERPOLATION-BASED CHANNEL STATE INFORMATION (CSI) ENHANCEMENTS IN LONG-TERM EVOLUTION (LTE) - According to example embodiments, a method for wireless communications by a user equipment (UE) is included. The method generally includes performing channel estimation at a plurality of frequency locations based on reference signals (RS) transmitted from at least one transmission point, computing at least one channel feedback metric for each frequency location, and transmitting the channel feedback metrics to the transmission point. According to certain aspects, a method for wireless communications by a base station (BS) is provided. The BS may receive channel feedback metrics from a UE, calculated at a plurality of frequency locations based on RSs transmitted from the BS. The BS may perform interpolation to determine values for channel feedback metrics for frequency locations between frequency locations of the received channel feedback metrics. | 07-24-2014 |
20140211677 | PRACH-BASED PROXIMITY DETECTION - Improvements to signaling procedures for use in physical random access channel (PRACH)-based proximity detection are disclosed. Signaling and signaling processes from a serving base station may trigger a more efficient and reliable transmission of PRACH from related user equipment (UE). At the dynamic power nodes (DPNs) monitoring for such PRACH-based proximity, features are disclosed which establish neighbor lists for more efficient management of detection and proximity activation. | 07-31-2014 |
20140307569 | ADAPTIVE DATA INTERFERENCE CANCELLATION - Real-time selection of interference cancellation schemes based on transmission parameters and amount of resource overlap between the desired payload and the interfering payload. Codeword level interference cancellation may be performed where the signal quality of the interfering signal indicates that the interfering payload will be decoded correctly. When performed, codeword level interference cancellation may be monitored to determine if decoding the interfering payload is converging. Other interference cancellation schemes may be selected based on the signal quality of the interfering signal or non-converging decode of the interfering payload. The number of iterations for iterative decoding in codeword level interference cancellation may be dynamically selected. The decoder output (e.g., soft bits) may be used to perform interference cancellations before the decoder is fully converged. Iterative decoding may be performed in multiple passes and soft decision output form one pass may be used to initialize the decoder for a subsequent pass. | 10-16-2014 |
20140348019 | CQI Estimation in a Wireless Communication Network - Techniques for estimating and reporting channel quality indicator (CQI) are disclosed. Neighboring base stations may cause strong interference to one another and may be allocated different resources, e.g., different subframes. A UE may observe different levels of interference on different resources. In an aspect, the UE may determine a CQI for resources allocated to a base station and having reduced or no interference from at least one interfering base station. In another aspect, the UE may determine multiple CQI for resources of different types and associated with different interference levels. For example, the UE may determine a first CQI based on at least one first subframe allocated to the base station and having reduced or no interference from the interfering base station(s). The UE may determine a second CQI based on at least one second subframe allocated to the interfering base station(s). | 11-27-2014 |
20140376517 | OPPORTUNISTIC ACTIVATION OF RELAYS IN CLOUD RADIO ACCESS NETWORKS - According to example embodiments, a method for wireless communications includes identifying at least one UE capable of being served by a plurality of transmission points (TPs) on a first frequency or by a relay on a second frequency, evaluating a first performance metric conditioned on the UE being served by the relay and a second performance metric conditioned on the UE being served by the plurality of TPs, deciding whether the UE should be served by the plurality of TPs on the first frequency or by the relay on the second frequency, based, at least in part, on the first and second performance metrics, and taking action to switch the UE to or from being served by the relay or the plurality of TPs, based on the decision. | 12-25-2014 |
20150049683 | APPARATUS AND METHOD OF IMPROVING IDENTIFICATION OF REFERENCE SIGNAL TRANSMISSIONS - Methods and apparatuses are described for improving identification of reference signal transmissions at a user equipment (UE). One or more restrictions related to reference signal transmissions in one or more interfering signals can be identified. One or more reference signal transmissions received in the one or more interfering signals can then be detected based at least in part on the one or more restrictions. The one or more reference signal transmissions received in the one or more interfering signals can be processed to improve communications with a serving base station. | 02-19-2015 |
20150055586 | RESTRICTIONS ON CONTROL CHANNEL SCHEDULING - Methods and apparatus are disclosed for improving blind-decoding and interference suppression associated with interference from non-serving cells in a wireless network, specifically, performing interference suppression on the non-serving cell control channel. Various aspect employ network-assisted blind-decoding of non-serving cell signals at UEs through the coordination, communication, and use of communication restriction conditions. Network aspects may restrict certain communications between eNBs and served UEs, and communicate the restrictions to non-served UE. The non-served UEs can then leverage the restrictions for more efficient blind-decoding of interfering eNB signals and interference cancellation of interfering eNB signals. | 02-26-2015 |