Base station, device to device user equipment, transmission method, report method and resource adjustment method for wireless communication system

A transmission method for use in a D2D UE, the D2D UE operating as a transmitting end and comprising a storage, a transceiver and a processor, the storage storing a piece of first transmission mode information and a piece of second transmission mode information, the first transmission mode information indicating a first transmission mode resource, the second transmission mode information indicating a second transmission mode resource, the processor being electrically connected to the storage and the transceiver, and the D2D data transmission method being executed by the processor, the method comprising:

• utilizing the first transmission mode resource to perform a D2D data transmission via the transceiver in a first transmission mode;
• determining whether an RLF occurs between the D2D UE and a base station;
• and
• utilizing the first transmission mode resource and the second transmission mode resource to perform the D2D data transmission via the transceiver when the RLF occurs between the D2D UE and the base station;
• wherein the first transmission mode resource is a specific resource scheduled by the base station and the second transmission mode resource is a pre-configured and/or quasi-statically configured contention resource pool.

A base station for a wireless communication system, comprising:

• a transceiver;
• a storage, being configured to store a D2D resource configuration;
• and
• a processor electrically connected to the storage and the transceiver, being configured to execute the following operations:
• receiving a plurality of first report messages from a plurality of receiving ends via the transceiver, each of the first report messages indicating a first received signal quality of one of the receiving ends, and each of the receiving ends being a D2D UE;
• evaluating a first configuration result of the D2D resource configuration according to the first received signal qualities;
• determining whether the first configuration result is consistent with an expected result;
• and
• adjusting the D2D resource configuration or transmitting a D2D data transmission mode switching message to a transmitting end when the first configuration result is inconsistent with the expected result, wherein the transmitting end is a D2D UE and transmits D2D data to one of the receiving ends.

A resource adjustment method for use in a base station, the base station comprising a storage, a transceiver and a processor, the storage being configured to store a D2D resource configuration, the processor being electrically connected to the storage and the transceiver, and the resource adjustment method being executed by the processor, the method comprising:

• receiving a plurality of first report messages from a plurality of receiving ends via the transceiver, each of the first report messages indicating a first received signal quality of one of the receiving ends, and each of the receiving ends being a D2D UE;
• evaluating a first configuration result of the D2D resource configuration according to the first receiving signal qualities;
• determining whether the first configuration result is consistent with an expected result;
• and
• adjusting the D2D resource configuration or transmitting a D2D data transmission mode switching message to a transmitting end when the first configuration result is inconsistent with the expected result, wherein the transmitting end is a D2D UE and transmits a piece of D2D data to one of the receiving ends.

A device to device (D2D) user equipment (UE), comprising:

• a transceiver;
• and
• a processor electrically connected to the transceiver, being configured to execute the following operations when the D2D UE operates as a transmitting end:
• receiving a piece of first transmission mode information and a piece of second transmission mode information from a base station via the transceiver, the first transmission mode information indicating a first transmission mode resource and the second transmission mode information indicating a second transmission mode resource;
• evaluating whether a collision is to occur when the second transmission mode resource is utilized to transmit D2D data to another D2D UE via the transceiver;
• utilizing the first transmission mode resource to transmit the D2D data to the another D2D UE via the transceiver when it is evaluated that the collision is to occur;
• and
• utilizing the second transmission mode resource to transmit the D2D data to the another D2D UE via the transceiver when it is evaluated that the collision is not to occur.

A device to device (D2D) user equipment (UE), comprising:

• a transceiver;
• and
• a processor electrically connected to the transceiver, being configured to execute the following operations when the D2D UE operates as a transmitting end:
• receiving a piece of first transmission mode information and a piece of second transmission mode information from a base station via the transceiver, the first transmission mode information indicating a first transmission mode resource and the second transmission mode information indicating a second transmission mode resource;
• receiving an operator message related to another D2D UE from the base station via the transceiver;
• determining whether the D2D UE and the another D2D UE belong to a same operator according to the operator message;
• utilizing the first transmission mode resource to transmit D2D data to the another D2D UE via the transceiver when the D2D UE and the another D2D UE belong to the same operator;
• and
• utilizing the second transmission mode resource to transmit the D2D data to the another D2D UE via the transceiver when the D2D UE and the another D2D UE don't belong to the same operator.

A device to device (D2D) user equipment (UE), comprising:

• a transceiver;
• and
• a processor electrically connected to the transceiver, being configured to execute the following operations when the D2D UE operates as a transmitting end:
• receiving a piece of first transmission mode information and a piece of second transmission mode information from a base station via the transceiver, the first transmission mode information indicating a first transmission mode resource and the second transmission mode information indicating a second transmission mode resource;
• and
• selecting one of the first transmission mode resource and the second transmission mode resource to transmit D2D data to another D2D UE via the transceiver;
• wherein the first transmission mode resource is a licensed band resource, and the second transmission mode resource is an unlicensed band resource.

A D2D data transmission method for use in a D2D UE, the D2D UE operating as a transmitting end and comprising a transceiver and a processor, the processor being electrically connected to the transceiver, and the D2D data transmission method being executed by the processor, the method comprising:

• receiving a piece of first transmission mode information and a piece of second transmission mode information from a base station via the transceiver, the first transmission mode information indicating a first transmission mode resource and the second transmission mode information indicating a second transmission mode resource;
• evaluating whether a collision is to occur when the second transmission mode resource is being utilized by the transceiver to perform a D2D data transmission to transmit D2D data to another D2D UE;
• utilizing the first transmission mode resource to perform the D2D data transmission via the transceiver when it is evaluated that the collision is to occur;
• and
• utilizing the second transmission mode resource to perform the D2D data transmission via the transceiver when it is evaluated that the collision is not to occur.

A D2D data transmission method for use in a D2D UE, the D2D UE operating as a transmitting end and comprising a transceiver and a processor, the processor being electrically connected to the transceiver, and the D2D data transmission method being executed by the processor, the method comprising:

• receiving a piece of first transmission mode information and a piece of second transmission mode information from a base station via the transceiver, the first transmission mode information indicating a first transmission mode resource and the second transmission mode information indicating a second transmission mode resource;
• receiving an operator message related to another D2D UE from the base station via the transceiver;
• determining whether the D2D UE and the another D2D UE belong to a same operator according to the operator message;
• utilizing the first transmission mode resource to transmit D2D data to the another D2D UE via the transceiver when the D2D UE and the another D2D UE belong to the same operator;
• and
• utilizing the second transmission mode resource to transmit the D2D data to the another D2D UE via the transceiver when the D2D UE and the another D2D UE don't belong to the same operator.