NETWORK NODE AND METHOD FOR SELECTING AN ALLOCATION STRATEGY IN SPECTRUM SHARING

摘要

A method performed by a network node for selecting an allocation strategy for allocating Resource Block Groups (RBGs) on a frequency carrier to a first Radio Access technology (RAT) and a second RAT for radio communication with a User Equipment (UE), is provided. The network node evaluates (501) a first allocation strategy by allocating with start from the decided first RAT starting point, a first number of RBGs to the first RAT. Then the network node allocates to the second RAT, a second number of RBGs by use of the RBs that remains on the carrier after occupation of the first number of RBGs. The network node computes a first difference between the number of RBs requested for the first RAT and a first number of RBs comprised in the first number of RBGs allocated to the first RAT, and further computes a second difference between the number of RBs requested for the second RAT and a second number of RBs as comprised in the second number of RBGs. The network node then evaluates (503) a second allocation strategy, by allocating to the decided second RAT, with start from the edge of the frequency carrier opposing that the starting point, a second number of RBGs to the second RAT. Then the network node allocates to the first RAT, a first number of RBGs by use of the RBs that remains on the frequency carrier after occupation by the second number of RBGs. The network node computes a first difference between the number of RBs requested for the second RAT and the second number of RBs as comprised in the second number of RBGs, and further computes a second difference between the number of RBs requested for the first RAT and a first number of RBs as comprised in the first number of RBGs. With the starting point being for the first RAT, the network node selects (504) an allocation strategy out of the first allocation strategy and second allocation strategy based on the first difference and the second difference of the evaluated first strategy, and the first difference and second difference of the evaluated second strategy.