1911 results about "Hybrid automatic repeat request" patented technology

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.

The invention discloses a hybrid automatic repeat request transmission method based on a polarization code. The hybrid automatic repeat request transmission method based on the polarization code comprises the following steps: after a coding bit sequence obtained after polarization coding is carried out to a sent information bit sequence is punched via a sending end, sending into a channel to be transmitted; decoding a received signal by a receiving end for CRC (cyclic redundancy check); if the received signal passes the check, feeding back an ACK (acknowledgement character) signal to the sending end, and otherwise, sending a NACK (negative acknowledgement) signal; if the sending end receives the NACK signal, sending one part of uncoded information bits to a receiving end again; according to the coding bit received for the first time and a newly-received information bit, decoding again by the receiving end; if a decoding result still does not pass the CRC, sending the other part of uncoded information bits to the receiving end again by the sending end; according to the coding bit received for the first time, the information bit received in the previous time and the newly-received information bit, decoding again by the receiving end; continuously executing the process; and finishing one whole transmission process until the sending end receives the ACK signal or the number of sending times reaches a preset maximum value.

A method and an apparatus for data transmission in a mobile telecommunication system supporting an enhanced uplink service are provided. A Transport Format Combination (TFC) selector determines TF information for data to be transmitted through a first data channel not supporting Hybrid Automatic Repeat reQuest (HARQ) and a second data channel supporting HARQ, and determines gain factors for the first and second data channel, and first and second control channel carrying control information for the first and second data channel. The gain factors are input to a physical channel transmission controller, and the physical channel transmission controller reduces the gain factor for the second channel if total transmit power required for transmission of the channels exceeds the predetermined maximum allowed power. A gain scaler adjusts transmit powers of the channels using the scaled gain factor and gain factors for the first data channel, the first control channel and the second control channel.

A method for dynamic adjustment of downlink / uplink resource allocation ratio in a long-term evolution (LTE) time division duplex (TDD) system is disclosed. The method includes replacing at least one of an uplink subframe and a downlink subframe with a mute subframe in a subframe pattern, indicating a first downlink / uplink resource allocation ratio. Thereafter, the mute subframe is replaced with either the uplink subframe or the downlink subframe to form another subframe pattern. The subframe pattern including the mute subframe is obtained from a lookup table, such that the replacing the mute subframe results in the other pattern. A data transmission in accordance with the other subframe pattern, indicating a second downlink / uplink resource allocation ratio, may be scheduled. Hybrid Automatic Repeat-request (HARQ) processing may be implemented after the at least one of the uplink subframe and the downlink subframe is replaced with the mute subframe in the first subframe pattern.

A method supporting a Hybrid Automatic Repeat Request (HARQ) between a subscriber station and a base station in a broadband wireless access communication system including. The method includes the steps of: transmitting at least one H-ARQ enabled uplink burst from the subscriber station to the base station; generating ACK / NACK information according to the received HARQ enabled uplink burst at the base station; mapping the generated ACK / NACK information to a bitmap at the base station; transmitting the bitmap through a downlink information from the base station to the subscriber station.

A data communication method and system for uniform arbitrary puncturing of parity bits generated by an encoder. The parity bits are stored in a buffer, and an a-bit accumulator is incremented to a predetermined initial value. For each parity bit in the buffer, the following steps are performed: the accumulator is incremented by a predetermined increment value, and if the accumulator overflows, the parity bit is selected for transmission. The predetermined initial value and the predetermined increment value are selected to achieve a desired amount of puncturing. In a further hybrid automatic repeat request (HARQ) communication method and system, the parity bits are generated by a low density parity check (LDPC) coder.

A wireless communication network includes a base station and a relay station. The relay station is configured to relay communications between the base station and at least one subscriber station. The base station is configured to communicate with the subscriber station via the relay station. The base station further is configured to transmit, in a subframe, a plurality of transport blocks for a plurality of Hybrid Automatic Repeat Request (HARQ) processes to the relay station. Each transport block corresponds to a different HARQ process.

Provided is a method of processing hybrid automatic repeat request (HARQ) and adaptive transmission of a device-to-device (D2D) link. In the method, an operation method of user equipment (UE) includes (a) receiving an initial transmission mode (TM) and transmission power for the D2D link from a base station, and performing data transmission through the D2D link, (b) determining, at the UE, a TM and transmission power of a succeeding subframe, or receiving a TM control value and a transmission power control value from counterpart UE of the D2D link and determining the TM and the transmission power of the succeeding subframe, and (c) performing the data transmission to the counterpart UE using the determined TM and transmission power. Here, (b) and (c) are repeated.

An apparatus 300 for a cellular communication system (100) comprises a buffer (303) which receives data for transmission over an air interface (115). The buffer (303) is coupled to a scheduler (305) which schedules the data and allocates the physical resource of the air interface (115). The transmissions are performed using a retransmission scheme such as a Hybrid-Automatic Repeat reQuest scheme. A load processor (309) determines a load characteristic associated with the scheduler (305) and a target controller (311) sets a target parameter for the retransmission scheme in response to the load characteristic. Specifically, a block error rate target may be set in response to a load level of a cell or plurality of cells. A transmission controller (307) sets a transmission parameter for a transmission in response to the target parameter and a transmitter (301) transmits the data using the transmission parameter. Accordingly, an operating point of the retransmission scheme may be dynamically adjusted thereby reducing overall latency.

A method for transmitting data using a hybrid automatic repeat request (HARQ) is provided. The method includes receiving scheduling information, the scheduling information comprising information regarding a radio resource; transmitting data by using the radio resource; and retransmitting the data or transmitting new data by reusing the radio resource if a received scheduling change indicator indicates that the radio resource is reused. The scheduling change indicator is control information different from the scheduling information. Resources can be effectively used by decreasing an amount of radio resources required for scheduling information.

A method and apparatus are described for a User Equipment (UE) to transmit in a control channel ACKnowledgement signals associated with a Hybrid Automatic Repeat reQuest process (HARQ-ACK signals) in response to receiving Transport Blocks (TBs) transmitted from a base station. The UE conveys the HARQ-ACK information by selecting one resource from multiple resources in the control channel and by selecting a constellation point of the modulation scheme for the HARQ-ACK signal. Transmission diversity is supported using different control channel resources that are already available to the UE without configuring additional resources. Design principles are described to optimally map the HARQ-ACK information to control channel resources and modulation constellation points for a Time Division Duplex (TDD) system and for a Frequency Division Duplex (FDD) system.

A method, apparatus, and chipset are provided for constructing hybrid automatic repeat request (HARQ) rate-compatible polar codes for communication channels. The method includes constructing, in a terminal, a base polar code of length 2n; and determining a sequence of m<2n bits to puncture in the base polar code by testing a predetermined criterion at most (22n+2n) / 2−1 times.

In a radio communication system that performs HARQ (Hybrid Automatic Repeat request), a mobile station returns the HARQ process state of the mobile station to the free state by the reception of ACK. In this state, the mobile station, upon receiving from the scheduling base station an SA (scheduling assignment) for assigning resources for retransmission, transmits a transmission process state notification reporting that the mobile station is in the free state when the mobile station does not have new data to be transmitted. The base station therefore recognizes that the mobile station is in the free state and returns the HARQ process state of the base station to the free state and halts the assignment of resources to the mobile station.

Provided is a method and apparatus for transmitting an HARQ ACK / NACK. The method includes: in a TDD-FDD CA scheme; recognizing a 2-bit downlink (DL) downlink assignment index (DAI) field configured in a DL downlink control information (DCI) format, the DL DCI format indicating a Physical Downlink Shared Channel (PDSCH) transmission on the second serving cell, and the 2-bit DL DAI field indicating that ten downlink subframes for the second serving cell are associated with one uplink subframe; in response to received data, generating a Hybrid Automatic Repeat reQuest (HARQ) Acknowledgement / Negative Acknowledgement (ACK / NACK) signal, the HARQ ACK / NACK signal being indexed based on a value of the 2-bit DL DAI field; and transmitting the HARQ ACK / NACK signal through one uplink subframe of the first serving cell.

Methods, systems, and devices for wireless communication are described. A base station may employ a multiplexing configuration based on latency and efficiency considerations. The base station may transmit a resource grant, a signal indicating the length of a downlink (DL) transmission time interval (TTI), and a signal indicating the length of a subsequent uplink (UL) TTI to one or more user equipment (UEs). The base station may dynamically select a new multiplexing configuration by, for example, setting the length of an UL TTI to zero or assigning multiple UEs resources in the same DL TTI. Latency may also be reduced by employing block feedback, such as block hybrid automatic repeat request (HARQ) feedback. A UE may determine and transmit HARQ feedback for each transport block (TB) of a set of TBs, which may be based on a time duration of a downlink TTI.

A method and apparatus for changing a Transmit Time Interval (TTI) based on a Hybrid Automatic Repeat Request (HARQ) process in a code division multiple access (CDMA) communication system that supports a packet data service through an Enhanced Uplink Dedicated transport Channel (E-DCH). According to the method and apparatus, a data transmission / reception is performed in a manner that a TTI change signal is received, the actual time point of TTI change is calculated based on the TTI change signal and the HARQ process of the previous TTI, and the TTI is changed at the calculated time point of TTI change.

A method, along with corresponding devices (11 12) and a system (11 12), by which in-sequence delivery of data blocks, sent wirelessly by a sending terminal (11), is provided to a radio link control layer (12a) of a receiving terminal (12) by a media access control layer service (12b) of the receiving terminal (12), where the data blocks are communicated according to a protocol, such as WCDMA, in which a media access control layer (11b) of the sending terminal (11) includes as a service the transmission of the data blocks and possible retransmission of the same data blocks in response to ACK / NAK signaling by a corresponding service included in a media access control layer of the receiving terminal. No data block sequence number is used in the ACK / NAK signaling.

A method and apparatus for performing uplink / downlink (UL / DL) transmission in a flexible subframe are provided. The method includes receiving downlink transmission configuration information in a flexible subframe that is different from configuration information of a subframe that has a fixed duplexing direction; detecting downlink control information transmitted by a base station in the flexible subframe; receiving downlink data corresponding to the downlink control information; and reporting Hybrid Automatic Repeat reQuest ACKnowledgment (HARQ-ACK) for the downlink data and downlink Channel State Indication (CSI) information to the base station.

The invention discloses a resource determination method and a device for a physical uplink control channel (PUCCH) of a large-band-width system. The method comprises the following steps that: user equipment obtains the channel resource index of the PUCCH, wherein the PUCCH is used for carrying the affirmative check / negative check (ACK / NACK) information of a physical downlink share channel (PDSCH) indicated with an enhanced physical uplink control channel (ePUCCH); and the user equipment determines the resources used by the PDSCH according to the obtained channel resource index. Through the method and the device provided by the invention, the normal proceeding of a hybrid automatic repeat request (HARQ) process corresponding to the ePDCCH is ensured.

Methods and apparatus are described for a User Equipment (UE) to transmit and for a base station to receive a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) signal in a resource of a Physical Uplink Control CHannel (PUCCH). The HARQ-ACK signal is transmitted from the UE in response to a detection of a PDCCH transmitted from the base station and conveying a DCI format that, depending on the PDCCH type, can include a HARQ-ACK PUCCH Resource Offset (HPRO) information field. The UE and the NodeB determine the PUCCH resource depending on the PDCCH type and, if the DCI format includes the HPRO, also depending on a PDCCH transmission type.

Provided are a method and a device for executing a hybrid automatic repeat request (HARQ) of a terminal in a time division duplex (TDD)-based wireless communication system. The method comprises the steps of: receiving an uplink grant for a first subframe of a second serving cell through a first serving cell; transmitting uplink data in the first subframe on the basis of the uplink grant; receiving an acknowledgement / not-acknowledgement (ACK / NACK) for the uplink data through the first serving cell; and, when the ACK / NACK signal is a NACK, transmitting a retransmission data for the uplink data in a second subframe of the second serving cell.

The embodiment of the invention provides an HARQ (Hybrid Automatic Repeat Request) signal transmitting method and device and receiving method and device based on polar codes. When transmitting is carried out at a time, when it is judged that there are surplus data blocks, one data block is selected out from the surplus data blocks as an initial transmitting information sequence; the combination of first sub-sequences and second sub-sequences corresponding to negative acknowledge signals in a first retransmitting control queue is determined as a retransmitting information sequence, wherein the first sub-sequences and the second sub-sequences are stored in a transmitting cache queue; the initial transmitting information sequence and the retransmitting information sequence are determined as to-be-transmitted information sequences; one first sub-sequence of the determined to-be-transmitted information sequences is stored in the transmitting cache sequence; polar coding is carried out to the to-be-transmitted information sequences; and the to-be-transmitted information sequences are transmitted. The accurate decoding probability of the information sequences failed to be transmitted for former M times is improved; therefore, the throughput of the communication system is improved; the average transmitting and receiving times before the accurate decoding is carried out to the to-be-transmitted information sequences is reduced; and therefore, the transmission delay of the communication is reduced.

Methods and apparatus for downlink Physical Hybrid Automatic Repeat-reQuest (HARQ) Indicator Channel (PHICH) mapping and channelization in a communication system. First, a base station assigns uplink (UL) physical resource block (PRB) indices to a set of units of user equipment in a cell. Then, for each user equipment, the base station calculates an index triple (KPHICH,0,KPHICH,1,KPHICH,2) for three repetitions of a PHICH signal to be transmitted to the user equipment, with KPHICH, i being a PHICH index indicating a PHICH resource for transmitting the i-th repetition of the PHICH signal to the user equipment, and i=1, 2, 3. When a data packet is received from a unit of user equipment transmitted via at least one physical resource block (PRB) indicated by the at least one PRB index that is assigned to the user equipment, the base station transmits PHICH signals to the user equipment by using the PHICH resources indicated by the PHICH indices assigned to the user equipment.

A method is provided for a user equipment device to request an uplink transmission resource allocation from a base station. The method includes determining whether there is a need for the resource allocation, providing an uplink resource request to be combined with another message if the need for the resource allocation is present, combining the uplink resource request with the other message to form a combined message, and transmitting the combined message to the base station for requesting the resource allocation. The combined message may be a hybrid automatic repeat request message with an uplink resource request field. A user equipment device and a base station of a wireless communication network for performing the method are also provided.

An apparatus and method are provided for transmitting a signal in a communication system using a low density parity check (LDPC) code. An LDPC codeword is generated by encoding an information word at a coding rate. A puncturing pattern is generated when a hybrid automatic repeat request (HARQ) scheme to be applied to the LDPC codeword is an incremental redundancy (IR) scheme. An additional pattern is generated when the HARQ scheme to be applied to the LDPC codeword is a partial chase combining (CC) scheme. A signal is transmitted by applying the puncturing pattern to the LDPC codeword at an associated coding rate when the HARQ scheme to be used is the IR scheme. A signal is transmitted by applying the additional pattern to the LDPC codeword at an associated coding rate when the HARQ scheme to be used is the partial CC scheme.

The present invention provides a method for improving Hybrid Automatic Repeat Request (HARQ) uplink transmission in a user equipment (UE) of a wireless communication system. The method includes the HARQ entity of the UE instructing an HARQ process to perform transmission or retransmission of a transport block according to an uplink (UL) grant allocated to the UE, and flushing all HARQ buffers for uplink transmission in the HARQ entity when a Time Alignment Timer of the UE expires.

A method of handling component carrier activation and deactivation for a mobile device capable of receiving and transmitting on a plurality of component carriers in a wireless communication system is disclosed. The method includes starting a deactivation timer for a component carrier of the plurality of component carriers when the component carrier is activated, wherein the deactivation timer provides a period of time for component carrier activation, performing a Hybrid Automatic Repeat Request (HARQ) process on the component carrier, and extending activation time of the component carrier when a retransmission of the HARQ process is not finished before deactivation of the component carrier.

A random access scheme for preventing unnecessary retransmission and a user equipment for the same are disclosed. If a Contention Resolution (CR) timer expires in contention resolution during a random access procedure or if a Physical Downlink Control Channel (PDCCH) signal or a Physical Downlink Shared Channel (PDSCH) signal associated with the PDCCH signal does not match an identifier of a terminal, a Hybrid Automatic Repeat Request (HARQ) buffer for storing a Medium Access Control Packet Data Unit (MAC PDU) transmitted in the random access procedure is flushed such that unnecessary data retransmission can be prevented.

A method and apparatus of transmitting an ACK / NACK signal for a hybrid automatic repeat request (HARQ) in a wireless communication system is provided. A first ACK / NACK resource index and a second ACK / NACK resource index based on resources used to transmit a downlink control channel is determined. An ACK / NACK signal for a downlink transport block is transmitted through a plurality of antennas using first ACK / NACK resources obtained from the first ACK / NACK resource index and second ACK / NACK resources obtained from the second ACK / NACK resource index. An HARQ ACK / NACK signal can be reliably transmitted through a plurality of antennas.

The present invention relates to a hybrid automatic repeat request (HARQ) method for transmitting data packets from a transmitting entity to a receiving entity via a data channel. Further, the present invention is related to mobile stations, base stations, radio network controllers and communication systems performing in the HARQ method. To overcome problems resulting from asynchronous retransmissions, the present invention provides a HARQ method sending retransmissions synchronous. According to the method, a feedback message is received from the receiving entity at the transmitting entity and, in case the feedback message indicates that the data packet has not been received successfully, a retransmission data packet is transmitted to the receiving entity after a predetermined time span upon having received said feedback message. The receiving entity soft combines the retransmission data packet with the previously received data packet.