Method and device in communication nodes used for random access in wireless communications

1. A first communication node used for wireless communications, comprising:

a first receiver, receiving first information;

a first transmitter, transmitting a first radio signal; and

a second receiver, monitoring a first-type signaling in a first time window; wherein:

an end time for a transmission of the first radio signal is used for determining a start of the first time window, the end time for a transmission of the first radio signal is earlier than the start of the first time window;

time-domain resource(s) occupied by the first radio signal is(are) used for determining a first characteristic identity;

the first characteristic identity is one of M characteristic identities, M being a positive integer greater than 1;

the first information is used for determining the M characteristic identities;

the first-type signaling carries one of the M characteristic identities;

the first communication node determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection;

any of the M characteristic identities is an RNTI equal to a hexadecimal integer through FFF0 and FFFD; and

the first-type signaling is transmitted through a PDCCH, the monitoring on the first-type signaling is performed in common search space (CSS).

2. The first communication node according to claim 1 , wherein:

the first receiver receives second information;

the second information is used for indicating a reference Round Trip Time (RTT) between a transmitter of the second information and a transmitter of the first radio signal, and a length of a time interval between the start of the first time window and the end time for a transmission of the first radio signal is positively linear with the reference RTT; and

the second information comprises one or more fields of a System Information Block (SIB).

3. The first communication node according to claim 1 , wherein:

the first transmitter transmits a second radio signal;

the second radio signal carries third information, the third information is used for indicating a position of time-domain resources occupied by the first radio signal in time domain, and a start time for a transmission of the second radio signal is later than the end time for a transmission of the first radio signal; the second radio signal carries an initial transmission or a retransmission of an Msg3, the third information comprises all or part of a MAC control element (CE).

4. The first communication node according to claim 1 , wherein:

the first information is used for determining a length of the first time window.

5. The first communication node according to claim 1 , wherein:

the second receiver receives a third radio signal carrying fourth information;

the first-type signaling detected in the first time window is used for determining time-frequency resources occupied by the third radio signal;

the fourth information is used for determining a first timing advance; and

the first timing advance is used for determining a transmission timing of a radio signal transmitted later than the first radio signal.

6. The first communication node according to claim 1 , wherein:

the first radio signal comprises a PRACH and a Physical Uplink Shared Channel (PUSCH);

the first radio signal carries a message (Msg) A for 2-step random access; and

the end time for a transmission of the first radio signal is an end time for a transmission of a PUSCH comprised in the first radio signal.

7. The first communication node according to claim 1 , wherein:

the first time window comprises a positive integer number of contiguous slots with a given subcarrier spacing (SCS); and

the start of the first time window is a start time for an earliest Type I PDCCH CSS set not earlier than the end time for the transmission of the first radio signal.

8. A second communication node used for wireless communications, comprising:

a second transmitter, transmitting first information;

a third receiver, receiving a first radio signal; and

a third transmitter, transmitting a first-type signaling in a first time window; wherein:

an end time for a transmission of the first radio signal is used for determining a start of the first time window, the end time for a transmission of the first radio signal is earlier than the start of the first time window;

time-domain resource(s) occupied by the first radio signal is(are) used for determining a first characteristic identity;

the first characteristic identity is one of M characteristic identities, M being a positive integer greater than 1;

the first information is used for determining the M characteristic identities;

the first-type signaling carries one of the M characteristic identities;

a transmitter of the first radio signal determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection;

any of the M characteristic identities is an RNTI equal to a hexadecimal integer through FFF0 and FFFD; and

the first-type signaling is transmitted through a PDCCH, the monitoring on the first-type signaling is performed in common search space (CSS).

9. The second communication node according to claim 8 , wherein:

the second transmitter transmits second information;

the second information is used for indicating a reference Round Trip Time (RTT) between a transmitter of the second information and a transmitter of the first radio signal, and a length of a time interval between the start of the first time window and the end time for a transmission of the first radio signal is positively linear with the reference RTT; and

the second information comprises one or more fields of a System Information Block (SIB).

10. The second communication node according to claim 8 , wherein:

the third receiver receives a second radio signal;

the second radio signal carries third information, the third information is used for indicating a position of time-domain resources occupied by the first radio signal in time domain, and a start time for a transmission of the second radio signal is later than the end time for a transmission of the first radio signal; the second radio signal carries an initial transmission or a retransmission of an Msg3, the third information comprises all or part of a MAC control element (CE).

11. The second communication node according to claim 8 , wherein:

the third transmitter transmits a third radio signal carrying fourth information;

the first-type signaling detected in the first time window is used for determining time-frequency resources occupied by the third radio signal;

the fourth information is used for determining a first timing advance; and

the first timing advance is used for determining a transmission timing of a radio signal transmitted later than the first radio signal.

12. The second communication node according to claim 8 , wherein:

the first radio signal comprises a PRACH and a Physical Uplink Shared Channel (PUSCH);

the first radio signal carries a message (Msg) A for 2-step random access; and

the end time for a transmission of the first radio signal is an end time for a transmission of a PUSCH comprised in the first radio signal.

13. The second communication node according to claim 8 , wherein:

the first time window comprises a positive integer number of contiguous slots with a given subcarrier spacing (SCS); and

the start of the first time window is a start time for an earliest Type I PDCCH CSS set not earlier than the end time for a transmission of the first radio signal.

14. A method in a first communication node used for wireless communications, comprising:

receiving first information;

transmitting a first radio signal; and

monitoring a first-type signaling in a first time window; wherein:

an end time for a transmission of the first radio signal is used for determining a start of the first time window, the end time for a transmission of the first radio signal is earlier than the start of the first time window;

time-domain resource(s) occupied by the first radio signal is(are) used for determining a first characteristic identity;

the first characteristic identity is one of M characteristic identities, M being a positive integer greater than 1;

the first information is used for determining the M characteristic identities;

the first-type signaling carries one of the M characteristic identities;

the first communication node determines a characteristic identity carried by the first-type signaling out of the M characteristic identities through blind detection;

any of the M characteristic identities is an RNTI equal to a hexadecimal integer through FFF0 and FFFD; and

the first-type signaling is transmitted through a PDCCH, the monitoring on the first-type signaling is performed in common search space (CSS).

15. The method in the first communication node according to claim 14 , comprising:

receiving second information;

wherein the second information is used for indicating a reference Round Trip Time (RTT) a transmitter of the second information and a transmitter of the first radio signal, and a length of a time interval between the start of the first time window and the end time for a transmission of the first radio signal is positively linear with the reference RTT; and

the second information comprises one or more fields of a System Information Block (SIB).

16. The method in the first communication node according to claim 14 , comprising:

transmitting a second radio signal;

wherein the second radio signal carries third information, the third information is used for indicating a position of time-domain resources occupied by the first radio signal in time domain, and a start time for a transmission of the second radio signal is later than the end time for a transmission of the first radio signal; the second radio signal carries an initial transmission or a retransmission of an Msg3, the third information comprises all or part of a MAC control element (CE).

17. The method in the first communication node according to claim 14 , wherein:

the first information is used for determining a length of the first time window.

18. The method in the first communication node according to claim 14 , comprising:

receiving a third radio signal carrying fourth information;

wherein the first-type signaling detected in the first time window is used for determining time-frequency resources occupied by the third radio signal;

the fourth information is used for determining a first timing advance and the first timing advance is used for determining a transmission timing of a radio signal transmitted later than the first radio signal.

19. The method in the first communication node according to claim 14 , wherein:

the first radio signal comprises a PRACH and a Physical Uplink Shared Channel (PUSCH);

the first radio signal carries a message (Msg) A for 2-step random access; and

the end time for a transmission of the first radio signal is an end time for a transmission of a PUSCH comprised in the first radio signal.

20. The method in the first communication node according to claim 14 , wherein:

the first time window comprises a positive integer number of contiguous slots with a given subcarrier spacing (SCS); and

the start of the first time window is a start time for an earliest Type I PDCCH CSS set not earlier than the end time for a transmission of the first radio signal.