Patent•
Method and apparatus for providing downlink acknowledgments and transmit indicators in an orthogonal frequency division multiplexing communication system
TL;DR: In this article, a communication system provides downlink acknowledgments corresponding to uplink transmission using hybrid automatic repeat request to multiple users in an Orthogonal Frequency Division Multiplexing communication system, wherein a frequency bandwidth comprises multiple frequency sub-carriers, by spreading each acknowledgment of multiple acknowledgments with a selected spreading sequence of multiple spreading sequences to produce multiple spread acknowledgments, wherein each acknowledgment is intended for a different user of the multiple users, and distributing the multiple spread acknowledgment across the multiple subcarriers.
Abstract: A communication system provides downlink acknowledgments corresponding to uplink transmission using hybrid automatic repeat request to multiple users in an Orthogonal Frequency Division Multiplexing communication system, wherein a frequency bandwidth comprises multiple frequency sub-carriers, by spreading each acknowledgment of multiple acknowledgments with a selected spreading sequence of multiple spreading sequences to produce multiple spread acknowledgments, wherein each acknowledgment is intended for a different user of the multiple users, and distributing the multiple spread acknowledgments across the multiple frequency sub-carriers.
Citations
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05 Apr 2011TL;DR: In this article, a plurality of ACK/NACK transmission techniques are selectively employed by a multi-carrier user equipment (UE) to reduce the number of bits to send and/or increase the payload bits available for sending the ACK and NACK information.
Abstract: Techniques for sending ACK/NACK information in a multi-carrier wireless communication network are disclosed. In one aspect, a plurality of ACK/NACK transmission techniques are selectively employed by a multi-carrier user equipment (UE) to reduce the number of bits of ACK/NACK information to send and/or increase the number of payload bits available for sending the ACK/NACK information. The ACK/NACK transmission techniques may include an orthogonal sequence reduction technique, a channel selection technique, a spatial bundling technique, a carrier bundling technique, and/or a subframe bundling technique. The ACK/NACK transmission techniques may be prioritized based on the number of carriers on which data transmissions are received, a payload size available for carrying ACK/NACK information, and/or other factors. The multi-carrier UE can utilize different ACK/NACK transmission techniques in connection with different subsets of its configured carriers.
118 citations
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15 Jun 2012TL;DR: In this article, a method for a base station to support network entry of a mobile station in a communication system is provided, which includes transmitting to the mobile station each of a plurality of transmitted network entry signals over a preferred downlink beam corresponding to the transmitted network entries.
Abstract: A method for a base station to support network entry of a mobile station in a communication system is provided The method includes transmitting to the mobile station each of a plurality of transmitted network entry signals over a preferred downlink beam corresponding to the transmitted network entry signal Each of a plurality of received network entry signals is received from the mobile station over a preferred uplink beam corresponding to the received network entry signal Each of the transmitted network entry signals comprises the preferred uplink beam corresponding to a subsequently received network entry signal, and each of the received network entry signals comprises the preferred downlink beam corresponding to a subsequently transmitted network entry signal
103 citations
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16 Aug 2007TL;DR: In this paper, a signature table storing part (101) has a plurality of signature groups generated from different Zadoff-Chu sequences, with a set of signatures generated from one ZADOFF-CHU sequence being one signature group.
Abstract: A radio transmitting apparatus and a radio transmitting method wherein the throughput is improved and a fast initial access processing including an RA burst is accomplished. According to these apparatus and method, a signature table storing part (101) has a plurality of signature groups generated from a plurality of different Zadoff-Chu sequences with a set of signatures generated from one Zadoff-Chu sequence being one signature group. A signature sequence assignment control part (102) switches signature groups to be assigned to a UE for each of paging transmissions, thereby assigning a signature sequence, which is to be used for an initial RA, from the same signature group. A paging information generating part (104) causes the ID of the assigned signature sequence to be included into paging information, which is then transmitted to the UE.
100 citations
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22 Jul 2009TL;DR: In this paper, a method for generating an uplink reference signal in a system supporting plural uplink-access transmission modes is proposed, where the reference signal configuration information is transmitted from a base station to a user device through PDCCH (Physical Downlink Control Channel).
Abstract: The present invention relates to a method for generating an uplink reference signal in a system supporting plural uplink-access transmission modes. The method comprises: a step for transmitting the reference signal configuration information about the configuration of a reference signal from a base station to a user device through an uplink grant PDCCH (Physical Downlink Control Channel), and a step for receiving from the user device a sub-frame including the reference signal that is generated based on the reference signal configuration information. The reference signal configuration information is prepared for plural uplink access transmission modes and includes a cyclic shift value for the sequence of the reference signal. The reference signal is supposed to be transmitted to an uplink, and the user device is set up to be operated in the uplink-access transmission mode that corresponding to the reference signal configuration information.
97 citations
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06 Aug 2009TL;DR: In this paper, a method and apparatus for reconfiguring a medium access control (MAC) entity in a wireless transmit receive unit (WTRU) is presented, which includes the WTRU transmitting a MAC reconfiguration request, the W TRU receiving a MAC re-configuration command including updated MAC parameter values and the MAC entity based on the updated MAC parameters.
Abstract: A method and apparatus for reconfiguring a medium access control (MAC) entity in a wireless transmit receive unit (WTRU). The method and apparatus includes the WTRU transmitting a MAC reconfiguration request, the WTRU receiving a MAC reconfiguration command including updated MAC parameter values and the WTRU reconfiguring a MAC entity based on the updated MAC parameter values in the MAC reconfiguration command.
80 citations
References
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12 Apr 2002
TL;DR: In this paper, the authors propose a group communication layer consisting of a pair of basic logical entities, an application bridge and a call processing server (CPS), which run group service applications which communicate with group service application(s) in a mobile station over the IP connections provided by the radio network.
Abstract: A packet mode (e.g. IP) group communication service layer is provided on top of a standard mainstream cellular radio network. Conceptually, the group communication layer comprises a pair of basic logical entities, an application bridge and a call processing server (CPS). The bridge and the CPS run group service applications which communicate with group service application(s) in a mobile station MS over the IP connections provided by the radio network. The CPS is responsible for control plane management of group communications. The bridge is responsible for the real-time distribution of VoIP packets to the user terminals according to their group memberships over valid connections programmed by the CPS.
264 citations
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21 May 2001
TL;DR: In this paper, a multiple mode data communication system and method provides the flexibility to schedule wireless unit transmissions and/or allow the wireless unit to transmit autonomously, depending on the data rate, the length of the data packet or the type of data.
Abstract: A multiple mode data communication system and method provides the flexibility to schedule wireless unit transmissions and/or allow the wireless unit to transmit autonomously. In certain embodiments, the wireless units can transmit autonomously and/or use scheduling depending on the data rate, the length of the data packet or the type of data. For example, the wireless units can transmit autonomously at lower data rates and use scheduling at higher data rates. Thus, the multiple mode system enables wireless unit transmissions to be scheduled and/or be transmit autonomously, and wireless units can simultaneously operate in different scheduling and/or autonomous modes. Depending on the embodiment, the system can provide even greater flexibility in operation by permitting wireless units to be scheduled by a single base station, scheduled by a multiplicity of base stations simultaneously or otherwise, via coordination between base stations, scheduled by a multiplicity of base stations in an uncoordinated and asynchronous manner, allowed to transmit autonomously, and/or allowed to transmit autonomously under base station supervision (i.e. rate control/adjustment by the base station). Additionally, a forward and/or reverse link control channel structure is provided which can be used to implement the multiple mode data communication system and/or support various features enabling increased throughput over a shared data channel in a wireless communications system.
163 citations
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31 May 2006
TL;DR: In this paper, a method, apparatus, and channel structure for acknowledging assignment messages is presented, which allows for efficient signaling based upon the resources. But the method and apparatus are not described.
Abstract: A method, apparatus, and channel structure for acknowledging assignment messages is provided. The method and apparatus allow for efficient signaling based upon the resources.
125 citations
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16 Sep 2004TL;DR: In this paper, the authors describe techniques for efficiently transmitting various types of signaling on the forward and reverse links in an OFDM-based system, where signaling data for a signaling channel on a given link is sent as "underlay" to other transmissions that may be sent on the same link.
Abstract: Techniques for efficiently transmitting various types of signaling on the forward and reverse links in an OFDM-based system are described. Instead of specifically allocating subbands to individual signaling channels, signaling data for a signaling channel on a given link is sent as “underlay” to other transmissions that may be sent on the same link. Each wireless terminal is assigned a different PN code. The signaling data for each terminal is spectrally spread over all or a portion of the system bandwidth using the assigned PN code. For the reverse link, a wireless terminal may transmit signaling on all N usable subbands and may transmit traffic data on L subbands assigned for data transmission, which may be a subset of the N usable subbands. For the forward link, a base station may transmit signaling and traffic data for all terminals on the N usable subbands.
97 citations
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05 Nov 2004TL;DR: In this paper, a HARQ method for guaranteeing a QoS in a wireless communication system is provided. In a transmitting apparatus using HARQ for transmitting packet data in wireless communication systems, a retransmission controller determines the size of redundancy information for correcting transmission errors in packet data, and a transmitter transmits the redundancy information of the determined size upon request for a reransmission of the packet data.
Abstract: An HARQ method for guaranteeing a QoS in a wireless communication system is provided. In a transmitting apparatus using a HARQ for transmitting packet data in a wireless communication system, a retransmission controller determines the size of redundancy information for correcting transmission errors in packet data, and a transmitter transmits the redundancy information of the determined size upon request for a retransmission of the packet data. Transmission of redundancy information of a variable size at each retransmission satisfies the QoS required for each user, maximizes a data throughput, and allows for the efficient reception of an ACK or a NACK for the redundancy information.
83 citations