SPS Configuration During Handover

A base station comprising:

• one or more processors;
• memory storing instructions that, when executed by the one or more processors, cause the base station to:
• receive, from a second base station, a request message for a handover of a wireless device, wherein the request message comprises traffic pattern parameters for one or more semi-persistent scheduling (SPS) traffic of the wireless device, the traffic pattern parameters comprising:
• a first traffic periodicity of a first traffic of the one or more SPS traffic;
• a first timing offset of the first traffic;
• and
• a first message size of the first traffic;
• determine, based at least on the traffic pattern parameters, at least one SPS configuration parameter for SPS radio resources;
• send, to the second base station, a handover request acknowledge message indicating the at least one SPS configuration parameter;
• receive, from the wireless device, a random access (RA) preamble associated with the handover of the wireless device;
• determine a subframe in a plurality of subframes based at least on the traffic pattern parameters;
• and
• transmit, to the wireless device, an SPS activation control command in the subframe indicating activation of the SPS radio resources.

A method comprising:

• receiving, by a first base station from a wireless device, a UE assistance information message comprising traffic pattern parameters for one or more SPS traffic of the wireless device, the traffic pattern parameters comprising:
• a first traffic periodicity of a first traffic of the one or more SPS traffic;
• a first timing offset of the first traffic;
• and
• a first message size of the first traffic;
• sending, by the first base station to a second base station, a request message for a handover of the wireless device, the request message comprising the traffic pattern parameters;
• receiving, by the first base station from the second base station, a handover request acknowledge message indicating at least one SPS configuration parameter for SPS radio resources determined based at least on the traffic pattern parameters;
• and
• transmitting, by the first base station to the wireless device, a handover command message indicating the at least one SPS configuration parameter.