Apparatus and method for link adaptation in uplink grant-less random access

A network component for link adaptation, the network component comprising:

• at least one processor;
• and
• a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions for:
• establishing a first look-up table (LUT) associating a plurality of link qualities with a first plurality of modulation and coding schemes (MCSs);
• establishing a second LUT associating a plurality of user equipments (UEs) with a second plurality of MCSs, wherein a number of entries in the first LUT is fewer than a number of entries in the second LUT;
• assigning, to a UE, a first MCS of the first plurality of MCSs based on the first LUT and a first link quality associated with the UE;
• and
• receiving, from the UE, a first packet in a grant free transmission, the first packet encoded using the first MCS assigned by the network component.

A method for realizing device-to-device communication relay selection, comprising:

• sending or preconfiguring, by a network control node through broadcasting or dedicated signaling, a relay reception resource pool and/or a relay selection threshold, to make a user equipment receive relay-related information sent by a relay node and select or configure an access relay node;
• wherein the relay selection threshold comprises a relay reselection hysteresis value;
• and wherein the relay-related information comprises at least one of:
• a relay usable time period of the relay node;
• and
• a relay charging demand of the relay node.

A user equipment, comprising a processor and a storage device, wherein the storage device communicably connected with the processor and configured for storing processor-executable instructions executable by the processor;

• wherein the processor-executable instructions when executed by the processor causes the processor to perform a method for realizing device-to-device communication relay selection, wherein the method comprises:
• receiving, by a user equipment, relay-related information sent by a relay node;
• and selecting or configuring, by the user equipment, an access relay node;
• in response to determining that the user equipment has not selected the access relay node, or the user equipment has already selected the access relay node and a measurement result that is obtained by the user equipment by performing a measurement on the relay-related information sent by the selected access relay node is less than a relay reselection device-to-device communication link threshold, the user equipment monitoring a relay reception resource pool and receiving the relay-related information sent by the relay node,
• wherein the relay-related information comprises at least one of:
• a relay usable time period of the relay node;
• a relay charging demand of the relay node.

A non-transitory computer-readable device having instructions stored thereon that, when executed by a network component, cause the network component to perform operations, the operations comprising:

• establishing a first look-up table (LUT) associating a plurality of link qualities with a first plurality of modulation and coding schemes (MCSs);
• establishing a second LUT associating a plurality of user equipments (UEs) with a second plurality of MCSs, wherein a number of entries in the first LUT is fewer than a number of entries in the second LUT;
• assigning, to a UE, a first MCS of the first plurality of MCSs based on the first LUT and a first link quality associated with the UE;
• and
• receiving, from the UE, a first packet in a grant free transmission, the first packet encoded using the first MCS assigned by the network component.