Systems and methods for adapting parameters in sidelink communications
Systems and methods for adapting parameters in wireless sidelink communications are disclosed herein. In one embodiment, a method performed by a first node is disclosed. The method comprises: transmitting a wireless signal to a second node; and receiving a control signal from the second node, wherein the control signal is generated by the second node based on the wireless signal and includes information for controlling sidelink communication between the first node and at least one third node.
1. A method performed by a first node, the method comprising:
transmitting a wireless signal to a second node, wherein
the wireless signal is related to sidelink communication between the first node and at least one third node, and
the wireless signal carries information that comprises:
identity information for the at least one third node,
resource allocation request indication,
a ratio between a total number of acknowledgements received from the at least one third node and a total number of sidelink transmissions to the at least one third node from the first node during a certain time period, and
sizes of requested resources; and
receiving a control signal from the second node, wherein the control signal is generated by the second node based on the wireless signal and includes information for controlling the sidelink communication between the first node and the at least one third node.
2. The method of claim 1 , wherein the wireless signal is generated based on feedback information received by the first node from the at least one third node that performs sidelink communication with the first node.
3. The method of claim 2 , wherein the wireless signal further carries information that comprises:
the feedback information received from the at least one third node.
4. The method of claim 2 , wherein the feedback information includes at least one of:
one or more process numbers each of which identifies a HARQ (Hybrid Automatic Repeat Request) process for the sidelink communication between the first node and the at least one third node; or
acknowledgement or negative acknowledgement information for the corresponding HARQ process.
5. The method of claim 1 , wherein the wireless signal further carries information that comprises at least one of the following:
retransmission indication;
feedback information generated by the first node for the sidelink communication between the first node and the at least one third node; or
a ratio between a total number of acknowledgements received from the at least one third node and a total number of sidelink transmissions to the at least one third node during a certain time period.
6. The method of claim 1 , wherein:
the wireless signal is transmitted via at least one of: (a) radio resource control (RRC) signaling, or (b) media access control (MAC) control element (CE) with logical channel identity (LCD) that indicates a type of the MAC CE; and
the control signal is received via at least one of: RRC signaling, MAC CE, and physical downlink control channel (PDCCH).
7. The method of claim 1 , wherein the control signal comprises at least one of the following information:
transmit power of the sidelink communication;
maximum transmit power of the sidelink communication;
communication resource for the sidelink communication;
transmission resource pool for the sidelink communication;
MCS (Modulation and Coding Scheme) for the sidelink communication;
modulation order for the sidelink communication;
retransmission number; or
maximum retransmission number.
8. The method of claim 1 , further comprising:
determining a modulation scheme to be used in the sidelink communication based on the control signal.
9. The method of claim 8 , further comprising:
transmitting category information to the second node, wherein the category information indicates one or more modulation schemes supported by the first node in a sidelink communication.
10. The method of claim 8 , wherein:
the determined modulation scheme is 64 quadrature amplitude modulation (QAM) to be used on a physical sidelink shared channel (PSSCH); and
the control signal indicates whether usage of 64QAM on the PSSCH is enabled.
11. The method of claim 8 , wherein:
the control signal carries threshold information; and
the modulation scheme to be used in the sidelink communication is determined by comparing the threshold information with at least one of:
a size of data to be transmitted in the sidelink communication,
channel quality of the sidelink communication,
a transmission range requirement for the data to be transmitted in the sidelink communication,
absolute speed of the first node, or
relative speed of the first node.
12. The method of claim 8 , further comprising transmitting assistance information about sidelink communication between the first node and the at least one third node to the second node, wherein:
the assistance information is received from the at least one third node or generated by the first node; and
the assistance information is utilized by the second node to determine the modulation scheme to be used in the sidelink communication.
13. The method of claim 12 , wherein the assistance information comprises at least one of: speed of the first node, speed of the at least one third node, acceleration of the first node, acceleration of the at least one third node, movement direction of the first node, movement direction of the at least one third node, sidelink measurement information of the sidelink communication, MCS related information, times of retransmission, or transmission resource information.
14. A method performed by a first node, the method comprising:
receiving a wireless signal from a second node, wherein
the wireless signal is related to sidelink communication between the second node and at least one third node,
the wireless signal carries information that comprises:
identity information for the at least one third node,
resource allocation request indication,
a ratio between a total number of acknowledgements received from the at least one third node and a total number of sidelink transmissions to the at least one third node from the second node during a certain time period, and
sizes of requested resources;
generating a control signal based on the wireless signal, wherein the control signal includes information for controlling the sidelink communication between the second node and the at least one third node; and
transmitting the control signal to the second node.
15. The method of claim 14 , wherein:
the wireless signal is generated by the second node based on feedback information; and
the feedback information is received by the second node from the at least one third node that performs sidelink communication with the second node.
16. The method of claim 15 , wherein the wireless signal further carries information that comprises:
the feedback information received from the at least one third node.
17. The method of claim 15 , wherein the feedback information includes at least one of:
one or more process numbers each of which identifies a HARQ (Hybrid Automatic Repeat Request) process for the sidelink communication between the second node and the at least one third node; or
acknowledgement or negative acknowledgement information for the corresponding HARQ process.
18. The method of claim 14 , wherein the wireless signal further carries information that comprises at least one of the following:
retransmission indication;
feedback information generated by the second node for the sidelink communication between the second node and the at least one third node; or
a ratio between a total number of acknowledgements received from the at least one third node and a total number of sidelink transmissions to the at least one third node from the second node during a certain time period.
19. The method of claim 14 , wherein:
the wireless signal is received via at least one of: (a) radio resource control (RRC) signaling, or (b) media access control (MAC) control element (CE) with logical channel identity (LCD) that indicates a type of the MAC CE; and
the control signal is transmitted via at least one of: RRC signaling, MAC CE, or physical downlink control channel (PDCCH).
20. The method of claim 14 , wherein the control signal comprises at least one of the following information:
transmit power of the sidelink communication;
maximum transmit power of the sidelink communication;
communication resource for the sidelink communication;
transmission resource pool for the sidelink communication;
MCS (Modulation and Coding Scheme) for the sidelink communication;
modulation order for the sidelink communication;
retransmission number; or
maximum retransmission number.