Abstract:
Methods, systems, and devices for wireless communication are described. User equipment (UE) and base stations may support frequency hopping with fast retuning for enhanced machine type communication (eMTC). For example, a UE may need to retune portions of its receive or transmit chain to support operation on various frequency bands, and it may perform the retune within a few symbols. Both base station and UE may anticipate or account for the retuning delay and communicate accordingly. A base station may refrain from transmitting for a certain period of time, for example. A base station may also account for frequency hopping delays for uplink communications. Systems may employ other techniques to support eMTC. For example, UEs may leverage reference signal patterns in certain control channels for demodulation. In some cases, base stations may alter control channel transmissions to account for various types of UEs with in the system.
Abstract:
Methods, systems, and devices for soft hybrid automatic repeat request operation in wireless communication are described. A user equipment (UE) may fail to decode a received signal, for example. The UE may store a portion of the signal in a buffer if the signal size is greater than the buffer size; otherwise, the UE may store the entire signal in the buffer. The UE may then receive a second signal and combine the second signal with the stored portion of the first signal; the combined signal may be larger than the buffer size. This combined signal may, for example, have a code rate less than the first signal. The UE may perform a second decoding attempt on the combined signal. The UE may determine that the second decoding attempt failed and may store a portion of the combined signal in the buffer.
Abstract:
A wireless device may determine a coverage enhancement (CE) level (or coverage extension) by attempting to decode a received broadcast signal. The wireless device may attempt to decode a portion of the broadcast signal using a CE level that is less than the CE level of the broadcast. If the decoding attempt is successfully, the CE level may be declared as an operating CE level. If decoding is unsuccessful, the CE level may be increased decoding retried. The wireless device may continue to test-decode the broadcast signal at new (e.g., increasing) CE levels until a CE level is sufficient for a decode and is declared the operating CE level of the wireless device. In some cases, the wireless device test-decodes a broadcast channel after selecting a CE level based on a path loss measurement of a downlink signal (e.g., reference signal).
Abstract:
Methods, systems, apparatuses, and devices are described for wireless communication. In one example, a sequence may be determined based on at least one of: an operator identifier associated with an operator using a spectrum or a clear channel assessment (CCA) slot index associated with the operator using the spectrum. At least one channel based on the determined sequence may be used to communicate over the spectrum.
Abstract:
Methods, systems, apparatuses, and devices are described for wireless communications. In one method, an opportunity may be identified for a first operator to perform a clear channel assessment (CCA) for a shared spectrum. The opportunity may be based on a priority of the first operator with respect to at least one other operator associated with the shared spectrum. The CCA may be performed for the shared spectrum during the identified opportunity to determine whether the shared spectrum is available for a transmission during a transmission interval.
Abstract:
Techniques for improving uplink throughput of UE uplink transmissions are disclosed. The UE may communicate with an eNB over an LTE wireless link using a first radio, and with a WLAN access point over a WLAN wireless link using a second radio. The UE may schedule a first portion of uplink data from an aggregating layer of the UE for transmission over the WLAN wireless link during a scheduling window, the scheduling based on an availability of access to the LTE wireless link. The UE may transmit the first portion of the uplink data over the WLAN wireless link during the scheduling window. The aggregation of the LTE wireless link with the WLAN wireless link may allow the UE to transmit uplink data from the aggregating layer of the UE over both the LTE wireless link or the WLAN wireless link.
Abstract:
Methods, systems, and devices for wireless communication are described. A wireless system utilizing one or more time-division duplexing (TDD) configured carriers may utilize a dual transmission time interval (TTI) structure (e.g., at the subframe level and symbol-level). The symbol level TTIs may be referred to as low latency (LL) TTIs, and may be organized within LL subframes. A LL subframe may be a subframe that is scheduled for transmissions in one direction (e.g., uplink or downlink, according to a TDD configuration) and may include multiple LL symbols scheduled for both uplink (UL) and downlink (DL) transmissions. Guard periods may be scheduled between adjacent LL symbols that have opposite directions of transmission to enable user equipment (UEs) to transition from receiving mode to transmit mode (or vice versa). The LL subframes may be transparent to receiving devices that do not support LL operations.
Abstract:
A method by a small cell for wireless communication may include receiving, by the small cell, a wireless Multicast-Broadcast Single Frequency Network (MBSFN) signal from a macro cell, wherein the small cell is characterized by having a transmit power substantially less than each macro cell in a wireless communication network with the small cell. The method may further include obtaining, by the small cell, a measurement value of the MBSFN signal within a radio range of the small cell. The method may further include acting, by the small cell, based on the measurement value. The small cell may be, or may include, at least one of a pico cell, a femto cell, or a home evolved Node B (HeNB).
Abstract:
A method of wireless communication manages the reporting of battery power for UE relays. A UE capable of serving as a UE relay receives a battery status report configuration. The battery status may be based on rate of power consumption, percentage of total battery power remaining, characteristics of particular battery type, and/or allocation of battery usage. The UE may transmit a battery status report to a base station.
Abstract:
Methods, systems, and devices are described for supporting common reference signaling in wireless communications systems. Some configurations introduce a phase discontinuity between common reference signal (CRS) transmissions on different subframes. This may address issues that may arise when a reduced CRS periodicity is utilized. Indicators may also be transmitted from base stations to user equipment (UEs) to indicate whether phase continuity may be assumed or not. Some configurations may support CRS sequence initialization. These tools and techniques may utilize an extended CRS sequence periodicity, which may increase the number of CRS sequences transmitted by a cell.