Patent application number | Description | Published |
20130294398 | Interference Suppression for Cellular Networks - A framework for enabling a user equipment (UE) to apply interference suppression processing during network conditions that are favorable to interference suppression or that are known is provided. The framework includes an interference suppression (IS) time and frequency (time/frequency) zone, which can be scheduled by a serving base station and signaled to the UE. In an embodiment, the serving base station coordinates with the interfering base station(s) to create a network condition favorable to interference suppression at the UE during the IS time/frequency zone. In another embodiment, the serving base station opportunistically schedules the IS time/frequency zone for the UE whenever it determines favorable transmission parameters being used or scheduled for use by the interfering base station(s). The UE applies interference suppression processing within the IS time/frequency zone, thereby improving receiver performance. Outside the time/frequency zone, the UE may disable interference suppression processing so as not to degrade receiver performance. | 11-07-2013 |
20130301746 | CODEBOOK BASED DOWNLINK MULTI-USER INTERFERENCE ALIGNMENT SCHEME - A method for operating a receiver having multiple receive antennas to process a signal from a first affiliated transmitter and align interference from a second interfering transmitter includes providing a codebook of predefined matrices. Each predefined matrix has an identifier associated therewith. A first channel matrix and a second channel matrix are assembled for the first and the second transmitters. An equivalent direct channel matrix is determined from the first and second channel matrices, and predetermined reference vectors are selected from a plurality of predetermined vectors. A predefined matrix is selected from the codebook based upon the equivalent direct channel matrix and an identifier for the predefined matrix is fed back to the first transmitter. A signal is received and decoded using a combining matrix derived from the predetermined reference vectors and an inverse of the second channel matrix, thereby reducing interference from the interfering transmitters. | 11-14-2013 |
20140140317 | Interference Suppression and Alignment for Cellular Networks - An interference suppression (IS) time/frequency zone for improved interference suppression at the user equipment (UE) is provided. The IS time/frequency zone can be scheduled and set up using existing signaling of the Almost Blank Subframe (ABS) framework. This includes using the existing signaling of the ABS framework to schedule the IS time/frequency zone, coordinate transmission parameters among base stations for the IS time/frequency zone, and signal the IS time/frequency zone to the UE. In another aspect, interfering base stations align respective reference signals during the IS time/frequency zone, which allows the UE to measure the channels from its serving base station and/or the interfering base stations(s). With channel state information knowledge at the UE, interference alignment can be achieved at the UE during the IS time/frequency zone. | 05-22-2014 |
20140161205 | Reference Signal Design for Massive MIMO Communication - The present disclosure is directed to a system and method for extending a reference signal pattern to define additional reference signals using a phase division multiplexing (PDM) technique. The reference signal pattern can be a predefined reference signal pattern in a wireless communication standard and can be extended to support massive MIMO communication. | 06-12-2014 |
20140211670 | Wireless Network Synchronization - Provided are various implementations of a wireless network synchronization solution. In one implementation, such a solution includes a mobile communication device including a receiver for use with the wireless network. The receiver is configured to receive a downlink communication from the wireless network, to detect a primary synchronization signal (PSS) at a PSS subframe symbol of the downlink communication, and to detect a secondary synchronization signal (SSS) at an SSS subframe symbol of the downlink communication. The receiver is further configured to identify the downlink communication as being duplexed using one of a first duplexing mode and a second duplexing mode when the PSS subframe symbol follows the SSS subframe symbol, and to identify the downlink communication as being duplexed using the other of the first duplexing mode and the second duplexing mode when the PSS subframe symbol precedes the SSS subframe symbol. | 07-31-2014 |
20140254514 | Codebook Enchancement for Long Term Evolution (LTE) - Multiple input multiple output systems using a transmit precoder codebook designed for a four-transmitter (4Tx) antenna configuration are described. The 4Tx antenna configuration is an attractive option for base stations in cellular network environments and it is desirable to use a transmitter precoder codebook that provides sufficient granularity in typical operating scenarios, and to address various antenna configurations. In an embodiment, the transmit precoder codebook can be used for a variety of transmit antenna configurations including uniform linear antenna arrays, cross-polarized antenna arrays and uncorrelated antenna arrays. In another embodiment, the transmit precoder codebook is a two-component codebook, with a first precoder component signaled at a first rate and a second precoder component signaled at a second higher rate. | 09-11-2014 |
20140307702 | Massive MIMO (M-MIMO) Support for Heterogeneous Networks (HETNETS) - Systems and methods for enabling a wireless backhaul network between access points (APs) in a wireless network are provided. In an embodiment, the wireless backhaul network is enabled using a Massive Multiple Input Multiple Output (MIMO) radio access technology (RAT). In another embodiment, the wireless backhaul network is established using the same RAT as used by the APs to serve user devices, and can utilize the same time and frequency resources used for user communication. | 10-16-2014 |
20140307819 | Adaptive Cross-Radio Access Technology (RAT) Channel Assignment - Systems and methods for channel assignment configuration in a multiple access point (AP) environment are provided. The multiple APs can be homogeneous or heterogeneous and can implement one or more radio access technologies (RATs), including Massive Multiple Input Multiple Output (M-MIMO) RATs. A channel assignment configuration for a user equipment (UE) can identify one or more communication channels to be established to serve the UE by one or more of the APs. | 10-16-2014 |
20140362787 | Reducing Precoder Signaling Overhead for MIMO Communication System - Where receiver performance at a User Equipment (UE) is similar using a coarse precoder codebook as using a fine resolution precoder codebook, the signaling of a two-component precoder codebook is modified such that a precoder codeword is signaled to the UE in only a portion of the physical resources allocated for precoder codeword signaling to the UE. The remaining portion of the allocated physical resources is used to signal control information to improve the UE's performance. | 12-11-2014 |
20150085944 | METHODS OF ANTENNA SYSTEM CONTROL IN MASSIVE MIMO SYSTEMS - A multiple input multiple output (MIMO) antenna system is implemented for communications in a wireless device. Information regarding the environment surrounding the wireless device may be used to determine which of the MIMO antennas are selected such that communications performance is improved. Metrics related to signal transmission and reception by the wireless device may be monitored and used to determine which MIMO antennas are selected. The metrics may be measured by any of the MIMO antennas at any time, including antennas currently engaged or not engaged in active communications. The metrics may be used in lieu of sensors to supplement or replace wireless device functionality otherwise provided by the sensors. | 03-26-2015 |