Signal transmitting/receiving method and apparatus, and signal receiving method and apparatus

1 . A method for transceiving a signal, performed by a first terminal, and comprising:

transceiving at a first frequency a first signal; and

transceiving at a second frequency a second signal;

wherein the first frequency is different from the second frequency,

in response to the first signal being a discovery signal for device discovery, the first signal is a first signal sequence of a physical layer; and

in response to the first signal being a ranging signal for determining a distance between terminals, the first signal is a second signal sequence of the physical layer,

wherein the first signal sequence is used to carry part or all of an identity of a discovered terminal at layer 1 (L1), and the second signal sequence is used to carry part or all of an identity at L1 of a terminal sending the ranging signal, or

wherein the first signal sequence has a first payload, and the first payload is used to carry at least one of following identities:

an identity of an application corresponding to the device discovery, an identity of the discovered terminal, the identity of the discovered terminal at L1, or an identity of the discovered terminal at layer 2 (L2);

the second signal sequence has a second payload, and the second payload is used to carry at least one of following information:

an identity of the terminal sending the ranging signal, an identity at L1 of the terminal sending the ranging signal; an identity at L2 of the terminal sending the ranging signal, first time information based on bilateral ranging, second time information based on the bilateral ranging, or third time information based on the bilateral ranging;

the first time information represents a time interval between a target terminal receiving a first ranging signal from a starting terminal and the target terminal replying a second ranging signal to the starting terminal; the second time information represents a time interval between the starting terminal receiving the second ranging signal and the starting terminal replying a third ranging signal to the target terminal; and the third time information represents a time interval between the starting terminal sending the first ranging signal and the starting terminal receiving the second ranging signal; and

the first payload is first physical layer information, a first control plane data packet, or a first user plane data packet; and the second payload is second physical layer information, a second control plane data packet, or a second user plane data packet.

2 . The method according to claim 1 , wherein the first signal is transceived based on a direct communication technology.

3 . The method according to claim 1 , wherein the discovery signal is a control plane data packet or a user plane data packet.

4 . The method according to claim 1 , wherein transceiving at the second frequency the second signal comprises:

sending the second signal to a network device at the second frequency;

wherein in a case that the second signal is a discovery control signal for controlling device discovery, the second signal is used to request the network device to assign an identity to a discovered terminal, and a reason for requesting the network device to assign the identity to the discovered terminal is further carried in the discovery control signal.

5 . The method according to claim 4 , wherein the discovery control signal is carried in a radio access control message or in a non-access stratum message.

6 . The method according to claim 4 , wherein a mapping relationship between an identity of a terminal discovered during a device discovery process and an application layer identity of the discovered terminal is carried in the discovery control signal.

7 . The method according to claim 1 , wherein the first frequency is a frequency on a licensed band or a frequency on an unlicensed band.

8 . The method according to claim 1 , wherein in response to the first signal being the ranging signal for determining the distance between the terminals, and the second signal being a ranging control signal for controlling the determination of the distance, transceiving at the second frequency the second signal comprises:

sending at the second frequency the second signal to a network device or a second terminal, wherein the distance is a distance between the first terminal and the second terminal.

9 . The method according to claim 8 , wherein the ranging control signal comprises at least one of following information:

ranging request information, ranging response information, ranging failure information, or ranging result information.

10 . The method according to claim 9 , wherein the ranging request information carries at least one of following information:

an identity of a terminal receiving the ranging request information, ranging capability information of a terminal sending the ranging request information, a ranging session identity, an identity at layer 1 (L1) of the ranging signal, an identity at layer 2 (L2) of the ranging signal, a ranging bandwidth, or time information receiving the ranging signal.

11 . The method according to claim 9 , wherein the ranging response information carries at least one of following information:

an identity of a terminal receiving the ranging response information, ranging capability information of a terminal sending the ranging response information, an identity at L1 of the ranging signal, an identity at L2 of the ranging signal, a ranging bandwidth, or time information receiving the ranging signal.

12 . The method according to claim 9 , wherein the ranging failure information carries at least one of following information:

an identity of a terminal receiving the ranging failure information, a ranging session identity, a ranging signal quality, or a reason for ranging failure.

13 . The method according to claim 9 , wherein the ranging result information carries at least one of following information:

result information based on unilateral ranging, result information based on bilateral ranging, angle of arrival information, angle of departure information, or the distance.

14 . The method according to claim 13 , wherein the result information based on the bilateral ranging comprises at least one of following information:

first time information based on the bilateral ranging, second time information based on the bilateral ranging, third time information based on the bilateral ranging, and fourth time information based on the bilateral ranging; and

wherein the first time information represents a time interval between a target terminal receiving a first ranging signal from a starting terminal and the target terminal replying a second ranging signal to the starting terminal; the second time information represents a time interval between the starting terminal receiving the second ranging signal and the starting terminal replying a third ranging signal to the target terminal; the third time information represents a time interval between the starting terminal sending the first ranging signal and the starting terminal receiving the second ranging signal; and the fourth time information represents a time interval between the target terminal sending the second ranging signal and the target terminal receiving the third ranging signal.

15 . A method for receiving a signal, performed by a network device, and comprising:

receiving at a first frequency a first signal sent by a first terminal; and

receiving at a second frequency a second signal sent by the first terminal;

wherein the first frequency is different from the second frequency,

in response to the first signal being a discovery signal for device discovery, the first signal is a first signal sequence of a physical layer; and

in response to the first signal being a ranging signal for determining a distance between terminals, the first signal is a second signal sequence of the physical layer,

wherein the first signal sequence is used to carry part or all of an identity of a discovered terminal at layer 1 (L1), and the second signal sequence is used to carry part or all of an identity at L1 of a terminal sending the ranging signal, or

wherein the first signal sequence has a first payload, and the first payload is used to carry at least one of following identities:

an identity of an application corresponding to the device discovery, an identity of the discovered terminal, the identity of the discovered terminal at L1, or an identity of the discovered terminal at layer 2 (L2);

the second signal sequence has a second payload, and the second payload is used to carry at least one of following information:

an identity of the terminal sending the ranging signal, an identity at L1 of the terminal sending the ranging signal; an identity at L2 of the terminal sending the ranging signal, first time information based on bilateral ranging, second time information based on the bilateral ranging, or third time information based on the bilateral ranging;

the first time information represents a time interval between a target terminal receiving a first ranging signal from a starting terminal and the target terminal replying a second ranging signal to the starting terminal; the second time information represents a time interval between the starting terminal receiving the second ranging signal and the starting terminal replying a third ranging signal to the target terminal; and the third time information represents a time interval between the starting terminal sending the first ranging signal and the starting terminal receiving the second ranging signal; and

the first payload is first physical layer information, a first control plane data packet, or a first user plane data packet; and the second payload is second physical layer information, a second control plane data packet, or a second user plane data packet.

16 . The method according to claim 15 , wherein the method further comprises:

sending the first signal to a second terminal at the first frequency.

17 . The method according to claim 15 , wherein the method further comprises:

feeding back at the second frequency a response signal for the second signal to the first terminal.