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

• US 8,724,577 B2
• Filed: 06/26/2012
• Issued: 05/13/2014
• 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:
  US13/533,438
• Publication Number:
  US 20120263115A1
• Time in Patent Office: 686 Days
• Field of Search: 370/328, 370/329, 370/330, 370335-336, 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 74/008 with additional processing of random access related information at receiving side
• 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

A wireless communication system including a base station and a wireless terminal, the method includes at the wireless terminal, selecting first information used for first random access or second information used for second random access; and transmitting, during or after the completion of random access using selected information, third information to be transmitted to the base station during random access using information which is not selected, the third information being used by the wireless terminal until the random access using information which is not selected is finished.

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,

selecting information among first information used for first random access and second information used for second random access, in a case of receiving a new request requesting for one random access among the first random access and the second random access while another random access among the first random access and the second random access is already ongoing; and

transmitting, during or after completion of a random access using the selected information from the selecting, among the first random access and the second random access, third information to be transmitted to the base station during a third random access, the third information being used by the wireless terminal until the third random access is finished.

2. The method for random access according to claim 1, wherein the first information is a first random access preamble and the second information is a second random access preamble.

3. The method for random access according to claim 1, wherein the third information is a random access preamble.

4. The method for random access according to claim 1, wherein the wireless terminal receives the first information used for the first random access from the base station.

5. The method for random access according to claim 1, wherein the wireless terminal receives the second information used for the second random access from the base station.

6. The method for random access according to claim 2, wherein the third information is a random access preamble.

7. The method for random access according to claim 2, wherein the wireless terminal receives the first information used for the first random access from the base station.

8. The method for random access according to claim 2, wherein the wireless terminal receives the second information used for the second random access from the base station.

9. A wireless communication system comprising:

a base station; and

a wireless terminal communicating with the base station, wherein

the wireless terminal selects information among first information used for first random access and second information used for second random access, in a case of receiving a new request requesting for one random access among the first random access and the second random access while another random access among the first random access and the second random access is already ongoing; and

transmits, during or after completion of a random access using the selected information from the selecting, which uses the selected information, among the first random access and the second random access, third information to be transmitted to the base station during a third random access, the third information being used by the wireless terminal until the third random access is finished; and

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

10. A wireless terminal comprising:

a selector that selects information among first information used for first random access and second information used for second random access in a case of receiving a new request requesting for one random access among the first random access and the second random access while another random access among the first random access and the second random access is already ongoing; and

a transmitter that transmits, during or after completion of a random access using the selected information from the selecting, which uses the selected information, among the first random access and the second random access, third information to be transmitted to a base station during a third random access, the third information being used by the wireless terminal until the third random access is finished.

11. A base station comprising:

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

a transmitting and receiving unit that receives information selected by the wireless terminal, which selects the information among first information used for first random access and second information used for second random access in a case of receiving a new request requesting for one random access among the first random access and the second random access while another random access among the first random access and the second random access is already ongoing and transmits, during or after completion of a random access using the selected information from the selecting, among the first random access and the second random access, third information to be transmitted to the base station during a third random access, the third information being used by the wireless terminal until the third random access is finished.