47results about How to "Reduce the amount of feedback information" patented technology

The invention relates to a method for realizing hybrid automatic retransmission based on reliability, which comprises that: channel coding codewords are divided into a plurality of groups and each group is a set comprising one or more coding bits; when a coding error exists at a receiving terminal, the receiving terminal chooses a group with minimum reliability from all groups of the present codewords; the receiving terminal feeds back the position information of the group with minimum reliability and negative acknowledgement NACK signals to a sending terminal and the sending terminal is notified of coding error existing at the receiving terminal so that to start up retransmission operation; the sending terminal retransmits all coding bits in groups corresponding to the position information and corresponding redundant versions according to the position information and NACK signals fed back from the receiving terminal.

The invention relates to a limit bit feedback and multiuser dispatching algorithm which comprises the following steps of: at the base station side, determining a loaded wave beam set for each subcarrier; at the user equipment side, obtaining the wave beam set information, forming an associated subcarrier on the basis of each subcarrier, calculating a channel quality estimation parameter of each wave beam, and determining the optimal wave beam and a key subcarrier; and if the channel quality corresponding to the optimal wave beam on the key subcarrier exceeds a scheduled threshold value, feeding a sequence number of the key subcarrier and the best wave beam number back to the base station side; and at the base station side, receiving the feedback information of the user equipment, expanding the feedback information of the key subcarrier to the associated subcarrier, determining a reference wave beam set adopted by the associated subcarrier on the basis of each subcarrier, and than carrying out the user dispatching on each wave beam, and finally carrying out the data transmission according to the selecting condition of the reference wave beam set and a user dispatching result. The invention has the advantages of less user feedback information amount, high feedback efficiency, large frequency spectrum multiplexing coefficient and high flexibility, simple realization, less signaling interaction between a user and a base station, and the like.

The invention relates to a method for sub-carrier division and sub-band cross arrangement of orthogonal frequency division multiplexing modulation, which is used in the technical field of digital information transmission. The present invention utilizes the characteristics of periodic fading of frequency selective channels to divide OFDM subcarriers into two types of sub-bands arranged crosswise, and distribute them to two types of users. One type of users adopts adaptive allocation technology, and the other One type of user adopts OFDM modulation transmission technology, and the two types of sub-bands are arranged alternately to occupy all effective data sub-carriers, and the data of the two types of users are mapped to their corresponding sub-carriers at the transmitter. The method reduces the amount of system feedback information required for adaptive subcarrier allocation, and at the same time takes into account the needs of general voice users.

The invention discloses a beam arrival angle-based multiuser scheduling scheme, which mainly comprises the following three steps of: 1) estimating the beam arrival angle; 2) dividing user subsets based on the beam arrival angle; and 3) selecting the optimal user in each subset. If a total user number is K, and a scheduling user number is M, an algorithm reduces the complexity to 2 K, ensures small loss of the performance, and is a low-computation suboptimal algorithm. Compared with the conventional user scheduling algorithm, the beam arrival angle-based multiuser scheduling scheme performs user scheduling according to long-term statistical information of a channel, has low computation complexity, low dependence on the instantaneous channel state information of a user, and higher robustness aiming at the time variability of a wireless channel, and can remarkably reduce the feedback information amount required by a system. Besides, a user channel scheduled by the scheme of the invention statistically has excellent orthogonality, and effectively improves the accessible channel capacity of the system.

The invention discloses a channel measuring method for a LTE (Long Term Evolution) system. The method is suitable for a CoMP working mode and comprises the following steps that: a base station marks off a reference mark placement region in a PDSCH (Physical Downlink Shared Channel), sets a plurality of reference marks in the reference mark placement region and sets a resource configuration mode with an identifier for each signal launching point in the CoMP; a terminal carries out channel measurement on each signal launching point according to the resource configuration modes and position information of the reference mark placement region, which re sent by the base station; the terminal feeds back the identifiers of the selected resource configuration modes which meet preset conditions to the base station; and the base station searches the corresponding signal launching points according to the identifier of the resource configuration modes, which are fed back by the terminal, and carries out channel measurement on the signal launching points by using CSI-RS (Channel State Indication Reference Signal) resources. According to the method provided by the invention, the problem of CSI-RS resource tension in the existing CoMP mode can be solved and the resource utilization rate of the PDSCH is improved.

The invention discloses a self-adaptation feedback method. A base station sets initial values of a feedback threshold respectively for a coordinated multi-point (CoMP) terminal and a non-CoMP terminal and sends the initial values of the feedback threshold to all terminals. The station classifies the terminals into a high priority user and a low priority user and sends indication information to the terminals. In a preset adjustment period, the terminals feed information back according to the initial values of priority and the feedback threshold. After the adjustment period is due, the station adjusts the feedback threshold in a self-adaptation mode according to a response rate of the terminals and a signal to interference plus noise power ration curve and sends the feedback threshold to all terminals to continuously carry out information feedback. The invention further discloses a system. By means of the self-adaptation feedback method and the system, feedback information quantity of user terminals can be reduced under a premise that quality of service (QoS) demands of the terminals, fairness among the terminals and system frequency spectrum efficiency are achieved.

The invention provides a scheduling method of coordinated multi-point (CoMP). In the method, for possible interference, a mode which makes a coordinated cell reselect a current scheduling user is used so that the interference between the coordinated cell and a main service cell user can be effectively avoided. System performance can be effectively improved. Simultaneously, only when the user scheduled by the main service cell is the edge user, does the main service cell send user feedback PMI_C information to the coordinated cell so that the coordinated cell can reselect the scheduling user which generates the minimum interference. Therefore, a system feedback information quantity during the CoMP can be effectively reduced.