Method for data transmission in wireless network, apparatus, and system

1. A method for a data transmission in a wireless network, the method comprising:

first determining, by a terminal device, a first configuration information that is used for second determining at least one first sidelink logical channel that is used to transmit direct communication data;

third determining, by the terminal device, that a type-1 data and a type-2 data need to be transmitted at a same time; and

allocating, by the terminal device in response to the third determining, a first transmit power for a first data based on the first configuration information,

wherein the type-1 data and the type-2 data are a service data of two distinct types that are to be transmitted by using distinct transmission resources, and the first data is the type-1 data to be transmitted by using the first sidelink logical channel,

wherein the first configuration information comprises a first identifier taken from the group consisting of:

a priority identifier, and

a logical channel identifier;

wherein the second determining comprises determining, by the terminal device as the at least one first sidelink logical channel:

a sidelink logical channel having the first identifier;

a sidelink logical channel not having the first identifier; or

when at least one of sidelink logical channels associated with data encapsulated in a protocol data unit of the terminal device has the first identifier, all the sidelink logical channels associated with the data encapsulated in the protocol data unit, as the first sidelink logical channels;

wherein the allocating comprises allocating the first transmit power for the first data based on a first limited power,

wherein the first transmit power is:

higher than the first limited power, and

lower than or equal to a maximum transmit power currently allowed by the terminal device; and

wherein the first limited power has a mapping relationship with the first identifier and indicates a maximum available transmit power for a data transmitted on a sidelink logical channel of the at least one first sidelink logical channel indicated by the first identifier.

2. The method according to claim 1 , wherein the third determining comprises determining that:

a transmission resource used for the type-1 data and a transmission resource used for the type-2 data at least partly overlap each other in a time domain; or

a subframe for transmitting the type-1 data and a subframe for transmitting the type-2 data at least partly overlap each other in time domain.

3. The method according to claim 1 , wherein the first configuration information comprises a first indication information that indicates at least some sidelink logical channels are the at least one first sidelink logical channel.

4. The method according to claim 1 , wherein the first limited power is:

carried in the first configuration information,

carried in a second message, or

preconfigured by the terminal device.

5. The method according to claim 1 further comprising:

fourth determining, by the terminal device during a second data transmission, that the type-1 data and the type-2 data are not to be transmitted at the same time;

fifth determining, by the terminal device in response to the fourth determining, a second transmit power for the type-1 data based on the currently allowed maximum transmit power, wherein the currently allowed maximum transmit power is:

preconfigured by the terminal device, or

determined by the terminal device based on configuration information transmitted by a network device; and

transmitting, by the terminal device, the type-1 data by using the second transmit power.

6. The method according to claim 1 , wherein the method further comprises:

determining, by the terminal device, at least one second sidelink logical channel based on the first configuration information, wherein the second sidelink logical channel is used to transmit direct communication data;

sixth determining that the type-1 data and the type-2 data need to be transmitted at the same time,

allocating, by the terminal device in response to the sixth determining, a third transmit power for the type-2 data;

allocating, by the terminal device, a fourth transmit power for a second data based on:

the allowed maximum transmit power, and

the third transmit power,

wherein the second data is the type-1 data to be transmitted by using the second sidelink logical channel; and

transmitting, by the terminal device, the second data by using the fourth transmit power.

7. A terminal device, comprising:

a transmission unit,

a processing unit, and

a non-transitory computer-readable medium including computer-executable instructions that, when executed by the processing device, facilitate carrying out a data transmission in a wireless network, wherein the computer-executable instructions, when executed by the processing unit, facilitate the terminal device:

first determining a first configuration information that is used for second determining at least one first sidelink logical channel that is used to transmit direct communication data;

third determining that a type-1 data and a type-2 data need to be transmitted at a same time; and

allocating, in response to the third determining, a first transmit power for a first data based on the first configuration information,

wherein the type-1 data and the type-2 data are a service data of two distinct types that are to be transmitted by using distinct transmission resources, and the first data is the type-1 data to be transmitted by using the first sidelink logical channel,

wherein the first configuration information comprises a first identifier taken from the group consisting of:

a priority identifier, and

a logical channel identifier;

wherein the second determining comprises determining, by the terminal device as the at least one first sidelink logical channel:

a sidelink logical channel having the first identifier;

a sidelink logical channel not having the first identifier; or

when at least one of sidelink logical channels associated with data encapsulated in a protocol data unit of the terminal device has the first identifier, all the sidelink logical channels associated with the data encapsulated in the protocol data unit, as the first sidelink logical channels;

wherein the allocating comprises allocating the first transmit power for the first data based on a first limited power,

wherein the first transmit power is:

higher than the first limited power, and

lower than or equal to a maximum transmit power currently allowed by the terminal device; and

wherein the first limited power has a mapping relationship with the first identifier and indicates a maximum available transmit power for a data transmitted on a sidelink logical channel of the at least one first sidelink logical channel indicated by the first identifier.

8. The terminal device according to claim 7 , wherein the third determining comprises determining that:

a transmission resource used for the type-1 data and a transmission resource used for the type-2 data at least partly overlap each other in a time domain; or

a subframe for transmitting the type-1 data and a subframe for transmitting the type-2 data at least partly overlap each other in a time domain.

9. The terminal device according to claim 7 , wherein the computer-executable instructions, when executed by the processing unit, further facilitate the terminal device:

fourth determining, during a second data transmission, that the type-1 data and the type-2 data are not to be transmitted at the same time;

fifth determining, in response to the fourth determining, a second transmit power for the type-1 data based on the currently allowed maximum transmit power, wherein the currently allowed maximum transmit power is:

preconfigured by the processing unit, or

determined by the processing unit based on configuration information transmitted by a network device; and

transmitting, by the processing unit cooperatively operating with the transmission unit, the type-1 data by using the second transmit power.

10. The terminal device according to claim 7 , wherein if the processing unit determines that the type-1 data and the type-2 data are not to be transmitted at the same time:

the processing unit determines a second transmit power based on a current link loss between the terminal device and a network device; and

the processing unit transmits the type-1 data by using the second transmit power.