353 results about "Block Error Rate" patented technology

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.

An adaptive quality control loop for link rate adaptation based on modulation and/or coding schemes (also referred to as "MCS levels") and one or more spreading codes that adaptively selects channel condition thresholds in real-time without measuring all the factors that affect selecting optimal channel condition thresholds. The adaptive quality control loop involves adjusting the channel condition thresholds with variable up and down steps based on target quality metrics along with measurements such as error detection results, relative frequencies of visiting each MCS level, and transmitted data rates, wherein the target quality metrics can be a block error rate or bit error rate target criterion. If the target quality metric is a block error rate target criterion, the variable step is determined using a desired MCS error rate based on MCS probabilities, MCS error rates and the block error rate target criterion. If the target quality metric is a bit error rate target criterion, the variable step is determined using a desired MCS error rate based on MCS probabilities, MCS error rates, average rate of bit errors, data rate, and the bit error rate target criterion.

To perform link adaptation at radio interfaces of an enhanced packet data cellular network the system behavior is simulated for different C/I conditions. Two sets of tables are obtained, each table including upgrade and downgrade thresholds expressed in terms of Block Error Rate (BLER). The tables are specialized for taking into account EGPRS type II hybrid ARQ, Incremental Redundancy (IR). Transmitted blocks are checked for FEC and results are sent to the network that continuously updates BLER. A reliability filter output is used to decide the weight between new and old measurements. IR efficiency is tested for each incoming block and an indicative variable IR_status is filtered. Each threshold of BLER to be used is obtained by linear interpolation between the tabulated threshold without IR and with perfect IR, both weighed with filtered IR_status. Filtered BLER is compared with interpolated thresholds for testing the incoming of a MCS switching condition.

The invention discloses a segmented cyclic redundancy check method for polarization codes mainly in order to solve the problems of high decoding complexity and high block error rate in the prior art. According to the technical scheme, the method comprises the steps as follows: first, the correct probability of the estimated value of each bit channel is calculated, and a channel for transmitting non-fixed bits is selected according to the probability; then, according to the correct probability of the estimated value of the channel for transmitting non-fixed bits, an information bit sequence is divided into sub information bit sequences, and segmented CRC check is carried out; next, polarization coding is carried out on the bit sequence joining in the segmented CRC check; and finally, the coded sequence is transmitted in the channel. Compared with the prior art, the method has the advantage that the method reduces the decoding complexity, improves the block error rate of decoding, and can be used to reduce the transmission error probability in the process of wireless communication.

A wireless base station sends transmission parameters that specify a control signal coding rate and a data signal coding rate which satisfy a BLER (Block Error Rate) required for a control signal and a data signal in a TTI (Transmit Time Interval) scheduled in response to a transmission request from a mobile station. In the specified TTI, the mobile station applies the coding rates, included in the transmission parameters and specified for the control signal and the data signal, to the control signal and the data signal, time-division multiplexes the coded control signal and coded data signal to generate constant transmission-power transmission data, and sends the generated transmission data to a wireless base station via PUSCH.

An improved acknowledgement (ACK) prioritization scheme is disclosed that provides ACKs with a lower block error rate (BLER) (as opposed to data) over an air interface, provides a separate radio bearer for ACKs, and successively increases the priority of ACKs for each retransmission required. A lower BLER target for ACKs may be achieved by an increase in transmit (Tx) power, additional coding for the radio bearer, or the use of diversity or hybrid automatic repeat request (ARQ) schemes. After packets are identified as either data or an ACK, they are sent to separate Tx buffers over separate radio bearers. Because the ACKs are transmitted over separate bearers and Tx buffers as compared to the data, ACKs are never queued behind the data, and are effectively prioritized as compared to the data. When retransmissions are required for an ACK packet, the scheduling prioritization is increased successively for each ACK retransmission required.

A method, apparatus and system for improving block error rate performance of a receiver having an iterative decoder in a communication system, the method, apparatus and system includes receiving an encoded frame of data, the encoded frame of data includes a quantity of code blocks where each code block has a corresponding code block size, determining a first maximum number of iterations for each of the code blocks of the encoded frame of data iteratively performing a decoding operation on a first code block until the occurrence of one of (a) the first maximum number of iterations has been reached and (b) the first code block has converged, and determining a second maximum number of iterations for the remaining code blocks of the encoded frame of data based on the number of actual iterations used to decode the first code block.

The invention discloses a test method for performances of an intelligent antenna, and a device and a system thereof, which are applied to a TD-SCDMA (time division synchronous code division multiple access) system. The method comprises the steps as follows: an up useful signal and an up interfering signal are generated according to preset data and the generated signals are merged and then input to a channel simulation device; the channel simulation device configures channel simulation parameters for a plurality of channels, generates simulation signals of the plurality of channels and inputs the generated simulation signals to all receive ports corresponding to array elements of the intelligent antenna; the intelligent antenna analyzes the simulation signals and obtains a data bit stream of the simulation signals; and an RNC simulator compares the data bit stream of the simulation signals with the corresponding bit stream of the preset data and then obtains a BLER (block error rate) or a BER (bit error rate). The method for carrying out united test to a plurality of array elements of the intelligent antenna can simulate complicated network situations sufficiently so as to lead the test to receiving and demodulating performances of the antenna to be more objective and accurate.

A wireless apparatus 1 receives reception quality information, propagation environment information, and block error rate detection information from a wireless apparatus of the other end of communication together with a data signal, and the target error rate selecting unit 7 selects any one of a plurality of tables in which target block error rates of respective ones of a plurality of transmission modes are registered in accordance with propagation environment information. The threshold value control unit 8 controls the threshold value of the reception quality to select the transmission mode by the control amount on the basis of the target block error rate in accordance with error rate detection information. The transmission mode selecting unit 9 compares reception quality information with the threshold value, selects any one of the transmission modes, and makes the selected one into the transmission mode to the wireless apparatus of the other end of communication.

The invention relates to the high-speed downlink packet access technology, in particular to a method of amending channel quality indictor and launching power in an HSDPA and a system thereof. To a certain extent, the invention can solve the problem that time delay in channel quality feedback can lead the accuracy of CQI to decrease and the complexity of the environment can lead the measurement of CQI to be not accurate. According to ACK/NACK message, the invention amends the present encoding rates, which can reduce the influence of the channel quality indicator feedback time delay and the influence of the environment complexity on channel quality indicator. With the condition of only adopting AMC technology, the block error rate of data block can be effectively controlled to be within 0.1.

Methods of providing power overload control in a communication system having a least one base station serving one or more users of at least one cell are described which may avoid an overload condition in the system. In one aspect, a target signal-to-interference ratio (SIR_target) may be controlled for inner loop power control implemented by the base station, so as to maintain the loading of the communication system below an overload condition. In another aspect, a target block error rate (BLER_target) may be controlled for outer loop power control implemented by the base station, so as to maintain the loading of communication system below an overload condition.

The invention discloses a method and device for generating a channel quality indicator. The method includes an inner loop processing process and/or an outer loop processing process. In the inner loop processing process, a predicted value of a signal to noise ratio can be acquired according to a measured value of the signal to noise ratio and a change rule of the signal to noise ratio, and then a first CQI value can be acquired. In the outer loop processing process, a CQI offset is acquired according to the relationship between the size of an estimated value of a block error rate and the size of a threshold value of the block error rate. A second CQI value can be acquired according to the first CQI value and the CQI offset. Besides, a modulation method can be selected to finish a complete CQI report. With the method, channel quality at the moment when the CQI report becomes valid can be better matched, the block error rate can be effectively controlled, therefore, feedback gain of the CQI can be greatly improved, and the throughput rate and service delay of a terminal can be obviously improved.

A beam failure recovery method and device, a storage medium, and a user equipment are provided. The beam failure recovery method comprises: receiving a reference signal set configured by a base station for monitoring beam failure, the reference signal set for monitoring beam failure comprising at least one reference signal; measuring the signal quality of each reference signal, and calculating according to the signal quality of each reference signal to obtain an estimated block error rate (hypothetical block error rate) of each reference signal; and triggering a beam failure recovery process if the reference signal set is in the Multi-TRP/Multi-Panel mode and at least one reference signal in the reference signal set used for monitoring the beam failure has the beam failure. According to the technical scheme of the invention, beam failure recovery can be realized in a Multi-TRP/Multi-Panel scene, and the communication efficiency between the user equipment and the base station is ensured.

The invention discloses a method for adjusting block error ratio. The method is used for realizing the adjustment on initial error block ratio, and further improves the veracity of the adjustment in a modulation coding mode. The method comprises the following steps of determining the QoS (Quality of Service) index of the current service of the user; judging whether the target initial block error rate (BLER) needs to be adjusted or not according to the determined QoS index; if so, carrying out the adjustment; and if not, keeping the current target initial BLER unchanged. The invention also discloses a device for implementing the method.

Various method and apparatus embodiments for adjusting control loop parameters for wireless communication link are disclosed. The adjustments may be performed responsive to a single radio UE tuning away from a first network to a second network, or due to a fading condition. Responsive to detecting the tuning away of the UE or the fading condition, the base station may adjust one or more parameters of a control loop. The adjustments may include changing parameters of one or more filters in the BS. For example, a block error rate (BLER) first state can be reset to a small value, or can be incrementally adjusted responsive to detecting discrete transmissions (DTX) or other signals from the UE. In another example, BLER filter coefficients may be updated responsive to DTX detections.

The embodiment of the present invention provides an uplink power detection method, a device and base station equipment, wherein the method comprises the steps of: detecting modulation and coding scheme and initial block error rate of an uplink data packet sent by a terminal; and determining whether the uplink power of the terminal is confined according to the relationships between the order of the detected modulation and coding scheme of the uplink data packet sent by the terminal and a first threshold, and between the detected initial block error rate of the uplink data packet sent by the terminal and a second threshold. The base station equipment provided by the embodiment of the invention detects modulation coding scheme and initial block error rate of an uplink data packet sent by a User Equipment (UE) and determines whether the uplink power of the UE is confined according to the detected modulation and coding scheme and the detected initial block error rate, thereby being able to precisely characterize the condition that the uplink signal of the UE is confined.

The invention discloses a method for feeding back CQI (Channel Quality Indicator) information and channel quality estimation, a user terminal and a base station. The user terminal feeds back a precoding matrix indication W1 which is optimally matched with a channel matrix from a base station of a service cell to the user terminal and a reference precoding matrix indication W2 which sets a matching degree with a channel matrix from the base station of a cooperative cell to the user terminal to the base station of the service cell; the user terminal confirms the channel quality indication CQI1 according to the W1 and the channel matrix from the base station of the service cell to the user terminal, confirms a channel quality indication CQI2 according to the W2 and the channel matrix from the base station of the cooperative cell to the user terminal and reports the CQI1 and the CQI2 to the base station of the service cell; and the base station adjusts the CQI2 according to the information fed back by the user terminal by combining with the dispatching information and direction information which are fed back by the cooperative cell. The invention achieves the aims of accurately estimating interference as much as possible, reducing the block error rate and improving the throughput in such a way that the user terminal reports the channel quality indication relevant information to assist the base station to carry out CQI adjustment.

The invention relates to a method and apparatus for transmitting data packets over a channel wherein the data packets have compressed headers. After compressing a header using a context, a number of consecutive update packets are transmitted, each containing data indicating the context. According to the invention, the channel quality is determined and the number of update packets is set accordingly. The channel quality may be determined by measuring the block error rate or the signal-to-noise ratio. Alternatively, the channel quality may be estimated by evaluating whether a NACK message has been received. The total number of update and non-update packets transmitted during a context update phase may be set according to the Round Trip Time. The number of non-update packets may further be determined based on codec properties. The invention may advantageously be used over unreliable, e.g. wireless, channels.

Disclosed is a method of operating a terminal in a communication system, including measuring channel quality, and transmitting a Channel Quality Indicator (CQI) based on the channel quality measured on the basis of a target BLock Error Rate (BLER), which is determined by using a ratio between efficiency corresponding to a first CQI and efficiency corresponding to a second CQI.

The invention discloses a test system and a test method for throughput capacity of a multi-antenna mobile terminal. In the test system, a link simulator performs full-link simulation to the multi-antenna mobile terminal to obtain simulation throughput capacity that the mobile terminal reaches a block error rate standard value and a simulation transmission rate value Rsimu corresponding to the simulation throughput capacity; an empty port tester controls a channel simulation instrument to load a channel parameter to perform channel simulation according to the channel parameter when the link simulator performs the full-link simulation; controls a base station simulator to transmit N frames according to the simulation transmission rate value Rsimu in accordance with the simulation transmission rate value Rsimu when the link simulator performs the full-link simulation; controls the transmission rate of the base station simulator to add or reduce one preset step value until the critical value of the block error rate is reached, and calculates the actual throughput capacity of the multi-antenna mobile terminal by using an actual transmission rate Rtest. The test system and the test method of the invention could improve the efficiency for testing the throughput capacity.

A communication method using random linear coding is disclosed. The communication method using a random linear code comprises receiving first code blocks randomly linear-coded from a transmitter; demodulating the first code blocks using a decision distance determined in accordance with a channel status; determining whether an error has occurred in the first code blocks, using the decision distance, and transmitting a NACK signal to the transmitter, the NACK signal including information of the number of the code blocks where an error has occurred. Since a block error rate can be controlled in accordance with channel status, throughput can be improved.

A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, comprising a non-magnetic powder and a binder resin, at least one magnetic layer formed on the primer layer, comprising a magnetic powder and a binder resin, and a back layer formed on the other surface of the non-magnetic support, wherein the magnetic powder contained in the uppermost layer of the magnetic layer is a rare earth metal-iron type magnetic powder of substantially spherical or ellipsoidal particles comprising a rare earth element and iron or a transition metal which comprises iron, and has a number average particle size 5 to 50 nm and an average axis ratio of 1 to 2, and the total thickness of the magnetic recording medium is less than 6 μm. This magnetic recording medium can achieve an excellent block error rate, which cannot be realized with magnetic recording media comprising conventional acicular magnetic powders.

The present invention is designed to provide a radio communication system, a user terminal and a radio communication method that make it possible to monitor communication quality adequately even when a new radio resource structure is employed. A radio communication system is provided, which transmits downlink control information from a radio base station to a user terminal by using an enhanced downlink control channel that is frequency-division-multiplexed with a downlink shared data channel, and which also monitors downlink quality based on the received quality of downlink reference signals that are transmitted from the radio base station to the user terminal, and, in this radio communication system, the user terminal determines radio link failures by comparing the received quality of the downlink reference signals transmitted from the radio base station, against one or both of first criteria, which are constituted of two thresholds that correspond to predetermined block error rates of a downlink control channel, and second criteria, which are constituted of two thresholds that are different from the two thresholds of the first criteria.