System and method of logical channel prioritization for D2D communication
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The method for allocating resource by a user equipment (UE) comprises identifying at least one sidelink logical channel not previously selected for a first sidelink control (SC) period and a second SC period, wherein the second SC period is overlapping in time with the first SC period, and allocating resource to the at least one sidelink logical channel.
1. A method for allocating resources by a user equipment (UE), the method comprising:
identifying one or more first sidelink logical channels selected for transmission in a first sidelink control (SC) period;
identifying one or more second sidelink logical channels selected for transmission in a second SC period overlapping in time with the first SC period;
identifying one or more sidelink logical channels for transmission in the first SC period by excluding the identified one or more first sidelink logical channels, excluding the identified one or more second sidelink logical channels, and including other sidelink logical channels having data available for transmission;
identifying a sidelink logical channel with the highest priority among the one or more sidelink logical channels identified for transmission in the first SC period;
selecting a destination corresponding to the sidelink logical channel with the highest priority; and
allocating resources to sidelink logical channels belonging to the selected destination based on an order of a priority.
2. The method of claim 1 , wherein the one or more first sidelink logical channels selected for transmission in the first SC period are one or more logical channels whose data are included in one or more medium access control (MAC) protocol data unitls (PDUs) transmitted in the first SC period.
3. The method of claim 1 , wherein the one or more first sidelink logical channels selected for transmission in the second SC period are one or more logical channels whose data are included in one or more medium access control (MAC) protocol data unitls (PDUs) transmitted in the second SC period.
4. The method of claim 1 , wherein the allocating the resources further comprises:
among the sidelink logical channels belonging to the selected destination and having data available for transmission, allocating the resources to the sidelink logical channel with a highest priority; and
if any resources remain, serving sidelink logical channels belonging to the destination in decreasing order of the priority until either data for the sidelink logical channels or a sidelink grant is exhausted, whichever comes first, wherein the sidelink logical channels configured with an equal priority are served equally.
5. A user equipment (UE) for allocating resources, the UE comprising:
a transceiver; and
a controller coupled with the transceiver and configured to control to:
identify one or more first sidelink logical channels selected for transmission in a first sidelink control (SC) period,
identify one or more second sidelink logical channels selected for transmission in a second SC period overlapping in time with the first SC period,
identify one or more sidelink logical channels for transmission in the first SC period by excluding the identified one or more first sidelink logical channels, excluding the identified one or more second sidelink logical channels, and including other sidelink logical channels having data available for transmission,
identify a sidelink logical channel with the highest priority among the one or more sidelink logical channels identified for transmission in the first SC period,
select a destination corresponding to the sidelink logical channel with the highest priority, and
allocate resources to sidelink logical channels belonging to the selected destination based on an order of a priority.
6. The UE of claim 5 , wherein the one or more first sidelink logical channels selected for transmission in the first SC period are one or more logical channels whose data are included in one or more medium access control (MAC) protocol data unitls (PDUs) transmitted in the first SC period.
7. The UE of claim 5 , wherein the one or more second sidelink logical channels selected for transmission in the second SC period are one or more logical channels whose data are included in one or more medium access control (MAC) protocol data unitls (PDUs) transmitted in the second SC period.
8. The UE of claim 5 , wherein the controller is further configured to:
allocate the resources to the sidelink logical channel with a highest priority among the sidelink logical channels belonging to the selected destination and having data available for transmission; and
if any resources remain, serve sidelink logical channels belonging to the destination in decreasing order of the priority until either data for the sidelink logical channels or a sidelink grant is exhausted, whichever comes first, wherein the sidelink logical channels configured with an equal priority are served equally.