Method for random access in wireless communication system, wireless communication system, wireless terminal, and base station unit

• US 8,902,837 B2
• Filed: 06/20/2012
• Issued: 12/02/2014
• Est. Priority Date: 08/10/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ohta, Yoshiaki, Tajima, Yoshiharu, Obuchi, Kazuhisa, Kawasaki, Yoshihiro
• Primary Examiner(s): Elpenord, Candal
• Application Number:
  US13/528,519
• Publication Number:
  US 20120257595A1
• Time in Patent Office: 895 Days
• Field of Search: 370/328, 370/329, 370/330, 370/335, 370/336, 370/338, 370342-343, 370344-345, 455/450, 455/452.1, 455/452.2
• US Class Current: 370/329
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

Random access in a wireless communication system including a base station and a wireless terminal, whereby at the wireless terminal, performing first random access scheme using a first random access preamble or second random access scheme using a second random access preamble which is received from the base station.

Claims

1. A method for random access in a wireless communication system including a base station and a wireless terminal, the method comprising:

at the wireless terminal,

recognizing a multiple allocation of random access preambles including a first random access preamble and a second random access preamble, the second random access preamble being received from the base station; and

performing only one random access procedure among a first random access procedure using the first random access preamble and a second random access procedure using the second random access preamble, in a case of receiving a new request requesting for one random access procedure among the first random access procedure and the second random access procedure while another random access procedure among the first random access procedure and the second random access procedure is already ongoing.

2. A wireless communication system comprising:

a base station; and

a wireless terminal communicating with the base station, wherein

the wireless terminal recognizes a multiple allocation of random access preambles including a first random access preamble and a second random access preamble, the second random access preamble being received from the base station, and performs only a second random access procedure using the second random access preamble, in a case of receiving a new request requesting for one random access procedure among a first random access procedure using the first random access preamble and the second random access procedure while another random access procedure among the first random access procedure and the second random access procedure is already ongoing; and

the base station performs a data communication with the wireless terminal.

3. A wireless communication system comprising:

a base station; and

a wireless terminal communicating with the base station, wherein

the wireless terminal recognizes a multiple allocation of random access preambles including a first random access preamble and a second random access preamble, the second random access preamble being received from the base station; and

continues only a first random access procedure using the first random access preamble in a case of receiving a new request requesting for a second random access procedure using the second random access preamble while the first random access procedure is already ongoing; and

the base station performs a data communication with the wireless terminal.

4. A wireless communication system comprising:

a base station; and

a wireless terminal communicating with the base station, wherein

the wireless terminal recognizes a multiple allocation of random access preambles including a first random access preamble and a second random access preamble, the first random access preamble being received from the base station; and

continues only a first random access procedure using the first random access preamble in a case of receiving a new request requesting for a second random access procedure using the second random access preamble while the first random access procedure is already ongoing; and

the base station performs a data communication with the wireless terminal.

5. A wireless communication system comprising:

a base station; and

a wireless terminal communicating with the base station, wherein

the wireless terminal recognizes a multiple allocation of information for random access including first information and second information, the second information being received from the base station, and selects the second information used for second random access and only performs the second random access using the selected information, in a case of receiving a new request requesting for one random access among first random access using the first information and the second random access while another random access among the first random access and the second random access is already ongoing; and

the base station performs a data communication with the wireless terminal.

6. A wireless terminal comprising:

a communication unit that receives a second random access preamble, which is used for a second random access procedure, from a base station; and

a processor that recognizes a multiple allocation of random access preambles including a first random access preamble and the second random access preamble, and performs only the second random access procedure using the received second random access preamble in a case of receiving a new request requesting for one random access procedure among the first random access procedure and the second random access procedure while another random access procedure among the first random access procedure and the second random access procedure is already ongoing.

7. A base station comprising:

a signature managing unit that manages a second random access preamble used for a second random access procedure and allocates the second random access preamble for a wireless terminal; and

a communication unit that performs a data communication with the wireless terminal which recognizes a multiple allocation of random access preambles including a first random access preamble and the second random access preamble, the second random access preamble being received from the base station, and performs only the second random access procedure using the allocated second random access preamble, in a case of receiving a new request requesting for one random access procedure among a first random access procedure using the first random access preamble and the second random access procedure while another random access procedure among the first random access procedure and the second random access procedure is already ongoing.

8. A base station comprising:

a signature managing unit that manages a second random access preamble used for a second random access procedure and allocates the second random access preamble for a wireless terminal; and

a communication unit that performs a data communication with the wireless terminal which recognizes a multiple allocation of random access preambles including a first random access preamble and the second random access preamble, the second random access preamble being received from the base station, and continues only a first random access procedure using the first random access preamble in a case of receiving a new request requesting for the second random access procedure using the allocated second random access preamble which is received from the base station while the first random access procedure is already ongoing.

9. A base station comprising:

a signature managing unit that manages a first random access preamble used for a first random access procedure and allocates the first random access preamble for a wireless terminal; and

a communication unit that performs a data communication with the wireless terminal which recognizes a multiple allocation of random access preambles including the first random access preamble and a second random access preamble, the first random access preamble being received from the base station, and continues only the first random access procedure using the allocated first random access preamble in a case of receiving a new request requesting for a second random access procedure using the second random access preamble while the first random access procedure is already ongoing.

10. A base station comprising:

a signature managing unit that manages second information used for second random access and allocates the second information for a wireless terminal; and

a communication unit that performs a data communication with the wireless terminal which recognizes a multiple allocation of information for random access including first information and the second information, the second information being received from the base station, and selects the allocated second information used for the second random access, in a case of receiving a new request requesting for one random access among first random access using the first information and the second random access while another random access among the first random access and the second random access is already ongoing and only performs the second random access using the selected information.

11. A base station comprising:

a signature managing unit that manages a second random access preamble used for a second random access and allocates the second random access preamble for a wireless terminal; and

a communication unit that performs a data communication with the wireless terminal which, when the wireless terminal receives a request for transmitting the allocated second random access preamble used for the second random access during performing first random access using a first random access preamble, the second random access preamble being received from the base station, recognizes a multiple allocation of random access preambles including the first random access preamble and the second random access preamble and only performs the second random access.

12. A base station comprising:

a signature managing unit that manages a first random access preamble used for a first random access and allocates the first random access preamble for a wireless terminal; and

a communication unit that performs a data communication with the wireless terminal which, when the wireless terminal receives a request for transmitting a second random access preamble used for second random access during performing the first random access using the allocated first random access preamble, the first random access preamble being received from the base station, recognizes a multiple allocation of random access preambles including the first random access preamble and the second random access preamble and only performs the first random access.