Emergency data transmission over unlicensed radio frequency spectrum band
摘要
說(shuō)明書(shū)
In some examples, an adjusted CCA opportunity of the first node may collide with a default CCA opportunity of a second node. In these examples, the adjusted CCA opportunity of the first node may preempt the default CCA opportunity of the second node (assuming, that is, that the second node does not have emergency data to transmit). When preemption occurs, and in some examples, the second node may yield to the first node and not perform a CCA for an LBT frame in which the preemption occurs. In other examples, the first node may relinquish the default CCA opportunity of the first node to the second node.
When multiples nodes have emergency data to transmit during an LBT frame, a mapping-function executed by each of the nodes may cycle access to one or more CCA opportunities having priority over at least one other CCA opportunity. For example, the mapping-function executed by each of the nodes may cycle access to an earliest CCA opportunity.
In one example, a first node associated with a first operator (e.g., PLMN_A) and a second node associated with a second operator (e.g., PLMN_B) may have emergency data to transmit at the same time, and the following priorities may be applied when selecting CCA opportunities for the first node and the second node:
f_1(PLMN_A)=0 for even LBT frames and f_1(PLMN_A)=f_0(PLMN_B) for odd LBT frames;
f_1(PLMN_B)=0 for odd LBT frames and f_1(PLMN_B)=f_0(PLMN_B) for even LBT frames;
If f_1(PLMN_A)=f_0(PLMN_B) in an even LBT frame, the second node yields to the first node (i.e., no CCA is performed by the second node), or the second node uses the CCA opportunity associated with f_0(PLMN_A);
