User Equipment (UE) in receipt of a session start signal indicating a
session frequency to use for a session along with other user equipment
uses the session frequency until a session stop message is received and
then changes to a frequency selected to avoid subsequent use of a same
frequency used by the other user equipment. For instance, when the UE
receives a Multimedia Broadcast Multicast Service (MBMS) session start
signal and it contains a preferred frequency, the Radio Resource Control
(RRC) layer of the UE could store the frequency of the serving cell for
later reference. The UE then converges to the preferred frequency for the
duration of the session. When the UE receives a session stop, RRC layer
retrieves the previously stored information about the pre-session
frequency and requests the physical layer (L1) to select a cell on the
frequency where it was previously camped on.