摘要:
Systems and methods are described herein relating to preemptive retransmission of a transport block in successive subframes on, e.g., a Listen-Before-Talk (LBT) cell. Embodiments of a method of operation of a radio node of a cellular communications network are disclosed. The radio node serves an LBT cell. In some embodiments, the method of operation of the radio node comprises transmitting a transport block in a first subframe on the LBT cell and retransmitting the transport block in a second subframe (e.g., on the LBT cell), where the second subframe is adjacent, in time, to the first subframe. In embodiments in which the retransmission of the transport block is on the LBT cell (or another LBT cell), the time span of a transmission burst can be extended to a maximum allowed burst duration.
摘要:
Systems and methods relating to Listen before Talk (LBT) procedures suitable for, e.g., License Assisted Access (LAA) to an unlicensed frequency spectrum or Long Term Evolution Unlicensed (LTE-U) are disclosed. In some embodiments, a method of operation of a node of a cellular communications network comprises performing a LBT procedure for an observed channel in an unlicensed frequency spectrum. The LBT procedure defers at least one Clear Channel Assessment (CCA) slot such that the LBT procedure concludes at or near a desired starting point for a transmission. The at least one CCA slot comprises at least one of a first CCA slot of the LBT procedure, one or more intermediate CCA slots of the LBT procedure, and a final CCA slot of the LBT procedure. The method further comprises performing the transmission on the observed channel upon completion of the LBT procedure.
摘要:
A method performed by a first communication device is described herein for sending an indication to a second communication device. The first communication device determines an indication of a subframe type. The subframe type is of a subframe sent on a carrier by a cell associated with the first communication device and a second communication device. The subframe type is one of punctured and normal. The first communication device sends the indication to the second communication device, the indication being as determined by the first communication device.
摘要:
Systems and methods relating to transmitting and using multiple Channel State Information Reference Signals (CSI-RSs) for different purposes are disclosed. In some embodiments, a method of operation of a user equipment device in a cellular communications network comprises receiving multiple Zero-Power (ZP) CSI-RS configurations from the cellular communications network, the multiple ZP CSI-RS configurations comprising a first ZP CSI-RS configuration for small-cell or transmission point discovery and a second ZP CSI-RS configuration for a purpose other than small-cell or transmission point discovery, and performing one or more actions based on an assumption that, within a subframe, a set of resource elements defined by a union of all resource elements in the multiple ZP CSI-RS configurations are muted.
摘要:
Embodiments herein relate to a communication terminal (10) for handling communication, which communication terminal (10) is being served by a radio access node (12, 13) in a first cell (11) on a carrier of a licensed frequency spectrum and cross-carrier scheduled in a second cell (14) on a carrier of an unlicensed frequency spectrum by the radio access node (12, 13) via the first cell (11). The communication terminal receives an indication that data may be scheduled for the communication terminal (10) on a data channel in the second cell (14). The communication terminal attempts to detect presence of the data channel intended for the communication terminal (10). Then, in case the communication terminal (10) detects presence of the data channel intended for the communication terminal (10), the communication terminal (10) decodes the data channel. In case the communication terminal (10) does not detect presence of the data channel intended for the communication terminal (10), the communication terminal (10) indicates a non-detection of the data channel to the radio access node (12, 13).
摘要:
A first and a second radio communication device and a respective method performed thereby for communicating between the first and the second radio communication device are provided. The method in the first radio communication device comprises transmitting (210), on an unlicensed frequency band, to at least the second radio communication device, an indication of a duration of a guard period, wherein an upcoming data transmission is to be performed to the second radio communication device after the expiration of the guard period. The method further comprises during the guard period, sending and/or receiving (220) information to/from at least one other radio communication device, the other communication device being the second radio communication device or a third communication device.
摘要:
A method for a user equipment, UE, in a wireless communication system supporting carrier aggregation, wherein the UE is configured by an access node with one primary carrier and at least one secondary carrier and wherein the at least one secondary carrier can be dynamically switched on and off by the access node on a fast basis, in the following referred to as on/off-feature, comprising the step of receiving an indication from the access node indicating whether the on/off-feature is used for the at least one secondary carrier or not. Further a UE is proposed, comprising a sending unit, adapted to send, on the primary carrier, an indication to the UE, indicating whether the on/off-feature is used for the at least one secondary carrier or not. Further an access node is proposed, comprising a sending unit, adapted to send, on the primary carrier, an indication to the UE, indicating whether the on/off-feature is used for the at least one secondary carrier or not.
摘要:
A communications network (10) comprises a base station (28) and a wireless terminal (30) which communicates over an air interface (32) with the base station (28). The base station (28) makes an identification or categorization of the wireless terminal (30) during a ranging procedure. The identification or categorization concerns whether or not the wireless terminal (30) has an enhanced capability. The categorization is made on a basis of a transmission characteristic of the wireless terminal (30). The base station (28) can then communicate with the wireless terminal (30) in a manner to utilize the enhanced capability of the wireless terminal (30).