IP Library › Granted Patent US 12,336,020
Granted Patent B2
US 12,336,020 · App. 17/885,705 · Granted Jun 17, 2025

Random access method and apparatus and communication system

Inventors: Yang Lu (Beijing, CN); Jian Zhang (Beijing, CN); Qinyan Jiang (Beijing, CN)
Assignee: FUJITSU LIMITED
H04W74/0841H04W74/04H04W74/0866
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Quick Facts
Patent No.
US 12,336,020
App. No.
17/885,705
Granted
Jun 17, 2025
Kind
B2
Abstract

A random access method and apparatus and a communication system. The apparatus includes a first processor circuit, the first processor circuit being configured to: receive resource configuration of contention-free random access, the resource configuration of contention-free random access comprising resource configuration of second type contention-free random access (CFRA); and perform a second type contention-free random access procedure according to the resource configuration of the second type CFRA, wherein the resource configuration of the second type CFRA comprises a second type CFRA preamble index associated with a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS), configuration of a physical random access channel occasion (RO) of a second message (MsgA), and configuration of a physical uplink shared channel (PUSCH) of the MsgA.

Claims (42)

1. An apparatus for configuring random access, applicable to a terminal equipment, the apparatus comprising a first processing unit, the first processing unit being configured to:

receive configuration of contention-free random access, the configuration of contention-free random access comprising configuration of 2-step contention-free random access (CFRA); and

perform a 2-step contention-free random access procedure according to the configuration of the 2-step CFRA using a dedicated preamble and physical uplink shared channel (PUSCH),

wherein the configuration of 2-step CFRA comprises configuration of the dedicated preamble index associated with a synchronization signal block (SSB) or channel state information reference signal (CSI-RS), configuration of at least one physical random access channel occasion (RO) of 2-step CFRA, and configuration of the PUSCH.

2. The apparatus according to claim 1 , wherein,

The RO of 2-step CFRA is associated with a SSB and shared with 4-step contention-based random access (CBRA) and 2-step CBRA.

3. The apparatus according to claim 1 , wherein,

the RO of 2-step CFRA is associated with a SSB and shared with 2-step CBRA.

4. The apparatus according to claim 2 , wherein,

the configuration for the RO of 2-step CFRA is cell-specific configuration for an UL bandwidth part (BWP).

5. The apparatus according to claim 2 , wherein,

configuration of the RO comprises:

a total number of random access preambles (TotalNumberOfRA-Preambles) available in the RO, the number (N) of SSBs associated with the RO, the number (R) of preambles of 4-step CBRA occupied by each SSB, the number (R′) of preambles of the 2-step CBRA occupied by each SSB.

6. The apparatus according to claim 5 , wherein,

in the RO, the preambles of 2-step CFRA are located after R′ consecutive preambles of 2-step CBRA.

7. The apparatus according to claim 2 , wherein,

the RO of 2-step CFRA is further shared with 4-step CFRA.

8. The apparatus according to claim 3 , wherein,

configuration of the RO comprises:

a total number of random access preambles (msgA-TotalNumberOfRA-Preambles) for 2-step CFRA and 2-step CBRA available in the RO, the number (N) of SSBs associated with the RO, and the number (R′) of preambles of 2-step CBRA occupied by each SSB.

9. The apparatus according to claim 8 , wherein,

in the RO, the preambles of 2-step CFRA are located after R′ consecutive preambles of 2-step CBRA.

10. The apparatus according to claim 1 , wherein,

the PUSCH includes at least one PUSCH occasion (PO) of 2-step CFRA.

11. The apparatus according to claim 10 , wherein,

The dedicated preamble of 2-step CFRA is mapped onto an available PO of the PUSCH; where, the mapped PO is indicated to the terminal equipment in the configuration of 2-step CFRA.

12. The apparatus according to claim 1 , wherein,

in a case where the RO of 2-step CFRA is dedicated to the terminal equipment and the configuration of the RO is carried in an dedicated RRC signaling, the terminal equipment uses the dedicated RO for the 2-step CFRA procedure; otherwise,

the terminal equipment uses the RO shared with 4-step CBRA and 2-step CBRA or the terminal equipment uses the RO shared with 2-step CBRA for the 2-step CFRA procedure.

13. An apparatus for configuring random access resources, applicable to a network equipment, the apparatus comprising a second processing unit, the second processing unit being configured to:

transmit configuration of contention-free random access, the configuration of contention-free random access comprising configuration of 2-step contention-free random access (CFRA); and

receive a dedicated preamble and physical uplink shared channel (PUSCH);

wherein the configuration of 2-step CFRA comprises configuration of the dedicated preamble index associated with a synchronization signal block (SSB) or channel state information reference signal (CSI-RS), configuration of at least one physical random access channel occasion (RO) of 2-step CFRA, and configuration of the PUSCH.

14. A communication system, comprising:

a terminal equipment, configured to comprise an apparatus for configuring random access resources, the apparatus comprising a first processor circuit, the first processor circuit being configured to:

receive configuration of contention-free random access, the configuration of contention-free random access comprising configuration of 2-step contention-free random access (CFRA); and

perform a 2-step contention-free random access procedure according to the configuration of the 2-step CFRA using a dedicated preamble and physical uplink shared channel (PUSCH),

wherein the configuration of 2-step CFRA comprises configuration of the dedicated preamble index associated with a synchronization signal block (SSB) or channel state information reference signal (CSI-RS), configuration of at least one physical random access channel occasion (RO) of 2-step CFRA, and configuration of the PUSCH; and

a network equipment, configured to comprise a network equipment apparatus for configuring random access resources, the network equipment apparatus comprising a second processor circuit, the second processor circuit configured to:

transmit configuration of contention-free random access, the configuration of contention-free random access comprising configuration of 2-step contention-free random access (CFRA); and

receive a dedicated preamble and physical uplink shared channel (PUSCH);

wherein the configuration of 2-step CFRA comprises configuration of the dedicated preamble index associated with a synchronization signal block (SSB) or channel state information reference signal (CSI-RS), configuration of at least one physical random access channel occasion (RO) of 2-step CFRA, and configuration of the PUSCH.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 5, 2026
From: FUJITSU LIMITED
To: 1FINITY INC.
Reel/Frame 074197/0244 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 11, 2022
From: LU, YANG; ZHANG, JIAN; JIANG, QINYAN
To: FUJITSU LIMITED
Reel/Frame 060780/0838 →
Continuity (2)
Continuation PCTCN2020075125 · Feb 13, 2020
Related Publication 20220394781A1 · Dec 8, 2022
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