Patent application number | Description | Published |
20080205451 | TRANSMISSION SCHEME FOR UPLINK ACCESS IN A FDMA SYSTEM - Transmission scheme for the uplink of FDMA systems that improves performance in an interference-dominated system by using a pilot scheme that provides enough information so that channel estimates can be obtained for a particular user, but which at the same time makes it possible to use pilot patterns that are different in different cells so that co-channel interference is mitigated. A codeword is used to position a set of pilot symbols within a set of subcarriers wherein each subcarrier has a first pilot time slot and a second pilot time slot associated with one or more data time slots. The set of subcarriers are identified on which to transmit the composite signal and the first pilot time slots and the second pilot time slots are filled with the pilot symbols in accordance with the codeword. The composite signal is then formatted as a combination of modulated data and pilot signals. | 08-28-2008 |
20080212539 | Method and Apparatus for Resource Reuse in a Communication System - Method and apparatuses taught herein enable link adaptation feedback to be determined in advance for future transmit intervals, based on one or more data sending units sending indications of future transmit resource allocations, and receiving corresponding link adaptation feedback from data receiving units. Knowledge of the future transmit resource allocations enable individual data sending units to predict interference conditions for the future transmit interval, and thereby compute link adaptation feedback that takes advantage of low-interference conditions. Individual data sending units receive link adaptation feedback for the future transmit interval from the data receiving units they are supporting, and make corresponding link adaptations for the future transmit interval. Such operations are, in one or more embodiments, carried out in a Wideband Code Division Multiple Access (WCDMA), Long Term Evolution LTE), or WiMAX network, wherein the data sending units comprise radio base stations, and the data receiving units comprise wireless communication devices. | 09-04-2008 |
20080298247 | Method and Apparatus for Vocoder Rate Control in a Wireless Network - A packet filter function in a wireless communication network monitors congestion and communicates a congestion indication to one or more vocoders. In one embodiment, the congestion indication comprises a vocoder source rate calculated by the packet filter function in response to the congestion. The reduced vocoder source rate frees system resources that can be allocated to new users to alleviate the congestion. The vocoder source rate may be communicated to the vocoder(s) in a variety of ways. | 12-04-2008 |
20080298264 | Method and Apparatus for Channel Estimation in a Transmit Diversity Environment - A method of channel estimation for a signal having a first portion transmitted using a transmit delay diversity scheme and a second portion transmitted using another multi-antenna transmission scheme includes determining a composite channel estimate from the transmit delay diversity portion of the signal. The method continues with segregating the composite channel estimate into delay groups corresponding to time offsets of the transmit delay diversity scheme for determination of first channel estimates for each subset of transmit antennas. Second channel estimates are determined for each subset of transmit antennas as a function of pilot symbols received in the second portion of the signal and corresponding ones of the first channel estimates. Thus, the first channel estimates are used to improve estimation of the second channel estimates. The method and variations of it may be implemented by configuring one or more processing circuits within a receiver circuit. | 12-04-2008 |
20080298285 | Efficient, Secure Digital Wireless Voice Telephony Via Selective Encryption - Secure, digital, packet-switched, voice telephony calls are wirelessly transmitted in an efficient manner that reduces air interface bandwidth consumption by encrypting only vocoder data frames containing encoded speech, and not encrypting vocoder data frames that do not contain speech, such as those containing silence parameters. The collective reduced bandwidth consumption across a large number of voice telephony calls may allow for the admission of one or more new calls during times of voice telephony congestion. Not encrypting the silence parameters does not compromise call privacy or security, since the silence data frames do not carry any speech. The classification of encoded data frames as containing speech or not may be performed in a variety of ways. | 12-04-2008 |
20080298524 | Interference Suppression in a Multicarrier Receiver - A receiver uses knowledge of pilot symbols transmitted by a neighboring sector to reduce interference in a received data symbol. The received data symbol is transmitted on one or more data subcarriers in a first sector. Overlapping pilot symbols transmitted on overlapping pilot carriers in a second sector are determined and used to generate channel estimates for the overlapping pilot carriers. The overlapping pilot symbols and pilot channel estimates are then used to reduce interference in the received data symbol. | 12-04-2008 |
20080299963 | Method and Apparatus for Vocoder Rate Control by a Mobile Terminal - A mobile terminal in a wireless communication network detects congestion and lowers its vocoder source rate in response, to help alleviate the congestion. The mobile terminal may detect the congestion in a variety of ways. The mobile terminal may monitor bandwidth allocation in the network, such as by inspecting the UL-MAP and DL-MAP of an IEEE 802.16 OFDM Physical Layer Frame header, for symmetric allocations. Congestion may be defined by the number of symmetric allocations exceeding a threshold. The congestion threshold may be programmed into the mobile terminal, or may be transmitted by the network. The mobile terminal may infer congestion by being repeatedly granted less bandwidth than requested. The network my explicitly indicate congestion, in a MAC message or by setting a congestion flag in one or more voice data frames. The congestion flag may comprise a reserved encoding of the AMR header Frame Type field. | 12-04-2008 |
20080310333 | SEMI-PERSISTENT RESOURCE ALLOCATION METHOD FOR UPLINK TRANSMISSION IN WIRELESS PACKET DATA SYSTEMS - A wireless telecommunications network supplies a semi-persistent resource that a wireless station can use for special purposes (such as a retransmission of packets for ARQ purposes or a control signal. The semi-persistent resource can be allocated by the system to other terminals if, e.g., a retransmission is not required. Since a retransmission is generally performed in response to a NACK received from a base station, the NACK may itself serve as a token that permits the wireless station to use the semi-persistent allocation. Thus, the technology includes, e.g., a method for resource allocation on a semi-persistent basis and efficient signaling for the usage of such allocation. | 12-18-2008 |
20080311858 | Diversity transmission using a single power amplifier - Diversity radio transmission is accomplished with excellent performance using multiple antennas receiving a transmission signal from a single power amplifier. A data signal to be transmitted is provided to a first antenna, and a phase-shifted version of the data signal is applied a second antenna. The relative phase shift between the data signal transmitted over the two transmit antennas ensures the two antenna signals can be constructively combined at the receiver. In one non-limiting example embodiment, the relative phase shift is determined by processing pilot signals sent along with the data signal and which are transmitted with predetermined phase shifts. | 12-18-2008 |
20090016465 | Interference Suppression Method and Apparatus - A composite baseband signal includes a desired signal component modulated according to a first modulation scheme and an interfering signal component modulated according to a second modulation scheme. Information is recovered from the composite signal by applying a phase rotation associated with the second modulation scheme to the composite signal to generate a rotated signal. Based on the rotated signal, a channel model associated with the desired signal component and interference cancelling filter coefficients associated with the interfering signal component are generated. The rotated signal is filtered according to the interference cancelling filter coefficients to suppress the interfering signal component from the rotated signal. The filtered signal is equalized based on branch metrics derived from the channel model and symbol hypotheses rotated in accordance with a difference in phase rotations associated with the first and second modulations to recover information from the desired signal component. | 01-15-2009 |
20090092085 | TELECOMMUNICATIONS FRAME STRUCTURE ACCOMODATING DIFFERING FORMATS - A radio access network (RAN) ( | 04-09-2009 |
20090116435 | MULTIPLE COMPATIBLE OFDM SYSTEMS WITH DIFFERENT BANDWIDTHS - The technology provides a frame handler, a controller, and a frame structure design for a new radio communications system that provides backward compatibility with an existing or legacy radio communications system with lower signal bandwidth. Data to be transmitted to the new and legacy radio terminals is processed into a frame using a frame format that is compatible with both the new radio access technology system and the legacy radio access technology system so that both types of radio terminals may receive and extract data from the frame intended for each of those radio terminals. The format allows new and legacy radio terminal communications across the different bandwidths employed by the new and legacy systems. | 05-07-2009 |
20090116458 | METHOD AND APPARATUS FOR EFFICIENT MULTIMEDIA DELIVERY IN A WIRELESS PACKET NETWORK - The present invention sends multiple versions of a multimedia packet to the base station, and, based on the radio channel and traffic characteristics, an appropriate version of the multimedia packet is selected to send to the mobile station at a given time. In this way, source transmission is improved to instantaneous conditions. The steps of the present invention are performed in conjunction with RTP used for multimedia transmission over internet protocol (IP) networks. In a first embodiment, the multiple versions are sent to the base station in the same RTP packet, and the base station strips out the extraneous versions. In a second embodiment, the base station receives multiple RTP packets having identical information in the packet header in many fields, and selects an appropriate one among these for transmission to the mobile station, discarding the rest. | 05-07-2009 |
20090161616 | RANGING PROCEDURE IDENTIFICATION OF ENHANCED WIRELESS TERMINAL - A communications network comprises a base station ( | 06-25-2009 |
20090238151 | METHOD AND APPARATUS FOR ENABLING QUICK PAGING IN TELECOMMUNICATION SYSTEMS - In a communication system, whether different transmitting stations use the same method or different methods of assigning quick paging code words to receiving stations, the receiving stations in a paging area assume that the same quick paging code words are used by all base stations in the paging area. To enable such operation by the receiving stations in a paging area covered by several base stations, those several base stations share information about the quick paging code words assigned to the various receiving stations known to the base stations. | 09-24-2009 |
20090274071 | Aggregation of Resources Over Multiple Frames in a TDD Communication System - According to embodiments of the present invention, multiple frames or sub-frames on an uplink channel may be aggregated into one logical unit for demodulation and decoding to allow one data packet to span over multiple frames. Multi-frame aggregation is enabled by modifying the uplink resource allocation messages transmitted to the user terminals. The multi-frame resource allocation message includes a BEGIN FLAG field indicating whether a corresponding frame is the first frame in a multi-frame allocation and a REMAINING RESOURCES field to indicate the number of units (e.g., slots or frames) remaining in the multi-frame allocation. | 11-05-2009 |
20090280847 | CODE WORD ASSIGNMENT METHODS FOR QUICK PAGING IN TELECOMMUNICATION SYSTEMS - Code words are assigned to subscriber stations or groups of subscriber stations in a communication network for a quick paging mechanism in which the assigned code words are transmitted as quick paging signals over unused frequency resources to signal the subscriber stations. Subsets of multiple code words from a set of code words can be assigned to respective paging groups, and overlapping subsets can be assigned to multiple paging groups. This enables a single code word to be used to address either a single paging group or multiple paging groups. | 11-12-2009 |
20090285173 | PILOT DESIGN USING COSTAS ARRAYS - A multi-pilot frame handler ( | 11-19-2009 |
20090292780 | SYSTEM AND METHOD FOR SELECTIVE APPLICATION OF A FEATURE TO MULTIPLE RECIPIENTS OF AN EMAIL MESSAGE - A system and method of selectively utilizing a feature with an email message. The method includes processing, by a mail client within a user's computer, a single email message for a plurality of recipients. The mail client receives a designated first set of recipients of the plurality of recipients for receiving the email message with a specific feature and a designated second set of recipients of the plurality of recipients for receiving the email message without the specific feature. In addition, a copy of the email message is generated without the specific feature. The email message is then sent with the specified feature to the first set of recipients and a copy of the email message without the specified feature is sent to the second set of recipients. The specific feature may be an attachment, an encryption of the message, or any other feature associated with the email message. In another embodiment, an extension header may be applied to the header of the email message to distinguish the first set of recipients from the second set of recipients. The message may then be sent to an email server which reformats the message into two messages according to the header extensions. | 11-26-2009 |
20100040015 | USING A SYNCHRONIZATION CHANNEL TO SEND QUICK PAGING SIGNALS - In an orthogonal frequency division multiple access communication system, a base station transmits a quick paging signal simultaneously with a synchronization signal during the same transmission symbol time period. Even though these different signals are transmitted during the same transmission symbol time period, a periodicity of the synchronization signal is maintained to facilitate rapid and cost-effective synchronization by subscriber stations with the base station. The quick paging signal alerts subscriber stations about whether to stay awake for a subsequent page or to go into a power saving sleep mode. | 02-18-2010 |
20100182989 | QUICK PAGING RECEIVERS IN TELECOMMUNICATION SYSTEMS - Methods and apparatus by which receiving stations or other communication network nodes can receive quick paging code words assigned by transmitting stations to the receiving stations. A receiving station can estimate the characteristics of the channel to the transmitting station based on a downlink-frame's preamble and use correlation to detect the presence of an assigned code word. The receiving station can suppress interference from other transmitting stations in the correlation operation based on the nature of the interference signal. When the receiving station knows an interfering signal from another transmitting station, the receiving station can subtract the interfering signal before carrying out the correlation operation. | 07-22-2010 |
20100260112 | QUICK PAGING IN TELECOMMUNICATION SYSTEMS - In an orthogonal frequency division multiple access communication system, unused frequency resources during a conventional preamble signal are used for a quick paging mechanism. A set of quick paging signals is sent over the unused frequency resources to signal one or more subscriber stations. | 10-14-2010 |
20100271963 | UPLINK RADIO RESOURCE ALLOCATION IN THE PRESENCE OF POWER LIMITED USERS - A base station in an OFDMA system which determines a modulation and coding scheme to use for a packet of a certain size to be transmitted by a Mobile Station. The base station schedules transmissions by mobile stations and transmits packets. The base station includes a processing unit which determines a number of time-frequency resources required to transmit the packet for a modulation and coding scheme, determines an SINR based on the number of time-frequency resources used and available power at the mobile station, determines a transmission rate as a ratio of the packet size transmitted to the number of time-frequency resources used, sets a rate to zero if the determined SINR is lower than a threshold SINR required for the modulation and coding scheme, and selects the modulation and coding scheme with a highest transmission rate. The base station includes a memory storing modulation and coding schemes. | 10-28-2010 |
20100287453 | ENCODING AND DECODING METHODS FOR EXPURGATED CONVOLUTIONAL CODES AND CONVOLUTIONAL TURBO CODES - A convolutional encoder ( | 11-11-2010 |
20110026647 | SOFT BIT VALUE GENERATION IN A SEQUENCE ESTIMATOR - Teachings presented herein offer reduced computational complexity for symbol sequence estimation, and also provide for the generation of soft bit values representing the reliability of that estimation. A demodulator is configured to generate these soft bit values by identifying a candidate value for each symbol in the sequence which is more likely than at least one other in a defined set of candidate values. Based on the candidate value identified for each symbol, the demodulator forms a reduced set of candidate values for the symbol by selecting as many additional candidate values from the defined set as are needed to have complementary bit values for each bit value in that identified candidate value. The demodulator calculates soft bit values for the symbol sequence based on a sequence estimation process whose state space for each symbol is constrained to the corresponding reduced set. | 02-03-2011 |
20110051640 | SYSTEM AND METHODS FOR REDUCING POWER CONSUMED BY A BASE STATION - The present invention provides systems and methods that enable a base station to consume less power. According to an embodiment of the invention, the base station reduces its power consumption by not continuously broadcasting control information. In such an embodiment, a mobile station that seeks access to a network to which the base station provides access does not search for broadcast control information prior to transmitting an access message to the base station, but rather simply transmits on a predetermined access channel an access request message. A base station that receives the access request message may unicast control information to the mobile station. | 03-03-2011 |
20110064043 | SYSTEM, METHOD, AND APPARATUS FOR IMPROVED SPACE-TIME CODING AND DYNAMIC SWITCHING WITH ADVANCED RECEIVERS - Methods and apparatus for allocating time-frequency resources to mobile terminals in a wireless communications system in which time-frequency resources may be selectively used according to a first multiple-input multiple-output (MIMO) transmission scheme or a second MIMO transmission scheme that differs from the first MIMO transmission scheme. An exemplary method comprises, for at least a first scheduling instance, identifying a first group of mobile terminals corresponding to the first MIMO transmission scheme and a second group of mobile terminals corresponding to the second MIMO transmission scheme, allocating time-frequency resources in a first pre-determined time-frequency zone exclusively to mobile terminals belonging to the first group, and allocating time-frequency resources in one or more additional pre-determined time-frequency zones to one or more mobile terminals belonging to the second group. This method may be implemented in a base station of a WiMAX system, for example. | 03-17-2011 |
20120134327 | SEMI-PERSISTENT RESOURCE ALLOCATION METHOD FOR UPLINK TRANSMISSION IN WIRELESS PACKET DATA SYSTEMS - A wireless telecommunications network supplies a semi-persistent resource that a wireless station can use for special purposes (such as a retransmission of packets for ARQ purposes or a control signal. The semi-persistent resource can be allocated by the system to other terminals if, e.g., a retransmission is not required. Since a retransmission is generally performed in response to a NACK received from a base station, the NACK may itself serve as a token that permits the wireless station to use the semi-persistent allocation. Thus, the technology includes, e.g., a method for resource allocation on a semi-persistent basis and efficient signaling for the usage of such allocation. | 05-31-2012 |
20120147860 | METHOD AND APPARATUS FOR EFFICIENT MULTIMEDIA DELIVERY IN A WIRELESS PACKET NETWORK - The present invention sends multiple versions of a multimedia packet to the base station, and, based on the radio channel and traffic characteristics, an appropriate version of the multimedia packet is selected to send to the mobile station at a given time. In this way, source transmission is improved to instantaneous conditions. The steps of the present invention are performed in conjunction with RTP used for multimedia transmission over internet protocol (IP) networks. In a first embodiment, the multiple versions are sent to the base station in the same RTP packet, and the base station strips out the extraneous versions. In a second embodiment, the base station receives multiple RTP packets having identical information in the packet header in many fields, and selects an appropriate one among these for transmission to the mobile station, discarding the rest. | 06-14-2012 |
20130311858 | ITERATIVE DECODING OF BLOCKS WITH CYCLIC REDUNDANCY CHECKS - The iterative decoding of blocks may be continued or terminated based on CRC checks. In an example embodiment, one iteration of an iterative decoding process is performed on a block whose information bits are covered by a CRC. The iterative decoding process is stopped if the CRC checks for a predetermined number of consecutive iterations. In another example embodiment, a decoding iteration is performed on a particular sub-block of multiple sub-blocks of a transport block, which includes a single CRC over an entirety of the transport block. The CRC is checked using decoded bits obtained from the decoding iteration on the particular sub-block and decoded bits obtained from previous decoding iterations on other sub-blocks of the multiple sub-blocks. The decoding iteration is then performed on a different sub-block if the CRC does not check. Also, the decoding iterations for the sub-blocks may be terminated if the CRC checks. | 11-21-2013 |
20140173371 | SEMI-PERSISTENT RESOURCE ALLOCATION METHOD FOR UPLINK TRANSMISSION IN WIRELESS PACKET DATA SYSTEMS - A wireless telecommunications network supplies a semi-persistent resource that a wireless station can use for special purposes (such as a retransmission of packets for ARQ purposes or a control signal. The semi-persistent resource can be allocated by the system to other terminals if, e.g., a retransmission is not required. Since a retransmission is generally performed in response to a NACK received from a base station, the NACK may itself serve as a token that permits the wireless station to use the semi-persistent allocation. Thus, the technology includes, e.g., a method for resource allocation on a semi-persistent basis and efficient signaling for the usage of such allocation. | 06-19-2014 |