Emergency data transmission over unlicensed radio frequency spectrum band
摘要
說明書
If f_0(PLMN_A)=f_1(PLMN_B) in an odd LBT frame, the first node yields to the second node (i.e., no CCA is performed by the first node) or the first node uses the CCA opportunity associated with f_0(PLMN_B).
When a node has emergency data to transmit over an unlicensed radio frequency spectrum band, the node may transmit a signal over the unlicensed radio frequency spectrum band. The signal may be transmitted with an indication that the node has emergency data to transmit. In some examples, the signal may also include an indication of a maximum time span of a transmission of the emergency data. The indication of the maximum time span of the transmission of the emergency data may enable other nodes to yield the unlicensed radio frequency spectrum band (or a channel thereof) for only the frames and/or subframes needed by the first node to transmit the emergency data.
In some examples, emergency data may be transmitted over an MBMS. Emergency data may in some cases be transmitted following transmission of a signal indicating that a node has emergency data to transmit. In some examples, all available transmission resources in the unlicensed radio frequency spectrum band may be allocated to the MBMS during the transmission of the emergency data. In other examples, available transmission resources in the unlicensed radio frequency spectrum band may be divided between the MBMS (e.g., an eMBMS) and unicast during transmission of the emergency data, and the emergency data may be transmitted over both the MBMS and the unicast. In examples where emergency data is transmitted over an MBMS, a MSP may be aligned to a CET period of a node transmitting emergency data. In some examples, a second signal may be transmitted to indicate that a node has completed transmitting emergency data.
