Radio transmission device and radio transmission method

• US 9,775,176 B2
• Filed: 02/29/2016
• Issued: 09/26/2017
• Est. Priority Date: 09/26/2006
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Inventors: Imamura, Daichi, Futagi, Sadaki, Fukuoka, Masaru, Iwai, Takashi, Matsumoto, Atsushi
• Primary Examiner(s): Jaroenchonwanit, Bunjob
• Application Number:
  US15/056,926
• Publication Number:
  US 20160183306A1
• Time in Patent Office: 575 Days
• Field of Search: None
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

Disclosed are a radio transmission device and a radio transmission method which reduce the RACH conflict ratio and improve the RACH detection characteristic. When the device and the method are used: as the number of signature numbers allocated for UE by the network side increases, the condition for allocating a signature by UE itself is mitigated and an expectation value which is a statistic average value of the RA quantity using the signature allocated by UE for itself is decreased; and as the number of signature numbers allocated for UE by the network side decreases, the condition for allocating a signature by UE itself is limited and an expectation value of the RA quantity using the signature allocated by UE for itself is increased.

Claims

1. A mobile station comprising:

circuitry, which, in operation, generates a random access preamble; and

a transmitter, which, in operation, transmits the generated random access preamble to a base station, wherein the circuitry, in operation;

generates the random access preamble based on a signature IDentifier (ID) when control information is received, the control information being directed to the mobile station and including the signature ID; and

generates the random access preamble based on a signature ID that is randomly selected from a plurality of signature IDs when the control information is not received.

2. The mobile station according to claim 1, wherein the control information explicitly signals the signature ID and is received from the base station.

3. The mobile station according to claim 1, comprising:

a receiver, which, in operation, receives the control information from the base station.

4. The mobile station according to claim 1, comprising:

a receiver, which, in operation, receives the control information from the base station, the signature ID being explicitly signaled by the control information.

5. The mobile station according to claim 1, comprising:

a receiver, which, in operation, receives the control information from the base station, the control information including an ID of the mobile station.

6. The mobile station according to claim 1, comprising:

a receiver, which, in operation, receives the control information from the base station, the control information including an ID of the mobile station, the signature ID being explicitly signaled by the control information.

7. The mobile station according to claim 1, comprising:

a receiver, which, in operation, receives information that is transmitted from the base station and that indicates the plurality of signature IDs allocated to the mobile station by the base station.

8. The mobile station according to claim 1, comprising:

a receiver, which, in operation, receives information that is transmitted from the base station and that indicates a quantity of the plurality of signature IDs allocated to the mobile station by the base station.

9. A random access method comprising:

generating a random access preamble; and

transmitting the generated random access preamble to a base station, wherein;

generating the random access preamble includes generating the random access preamble based on a signature IDentifier (ID) when control information is received, the control information being directed to a mobile station and including the signature ID; and

generating the random access preamble includes generating the random access preamble based on a signature ID that is randomly selected from a plurality of signature IDs when the control information is not received.

10. The random access method according to claim 9, wherein the control information explicitly signals the signature ID and is transmitted from the base station.

11. The random access method according to claim 9, wherein the control information is transmitted from the base station.

12. The random access method according to claim 9, wherein the control information is transmitted from the base station and includes an ID of the mobile station.

13. The random access method according to claim 9, wherein the control information is transmitted from the base station and includes an ID of the mobile station, the signature ID being explicitly signaled by the control information.

14. The random access method according to claim 9, comprising:

receiving information that is transmitted from the base station and that indicates the plurality of signature IDs allocated to the mobile station by the base station.

15. The random access method according to claim 9, comprising:

receiving information that is transmitted from the base station and that indicates a quantity of the plurality of signature IDs allocated to the mobile station by the base station.