RADIO TRANSMISSION DEVICE AND RADIO TRANSMISSION METHOD

• US 20100027484A1
• Filed: 09/26/2007
• Published: 02/04/2010
• Est. Priority Date: 09/26/2006
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Matsumoto, Atsuhi, Iwai, Takashi, Fukuoka, Masaru, Imamura, Daichi, Futagi, Sadaki
• Granted Patent: US 8,265,025 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• 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 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• 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 is a radio transmission device and a radio transmission method which reduces 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 radio transmitting apparatus comprising:

an random access burst transmission control section that restricts conditions for allocating a signature to the radio transmitting apparatus more when the number of signatures allocated by a network side, which is a communicating party, to other radio communication terminal apparatuses increases, or alleviates the conditions for allocating a signature to the radio transmitting apparatus more when the number of signatures allocated by the network side to the other radio communication terminal apparatuses decreases;

an random access burst generating section that generates a random access burst including a signature when the condition is satisfied; and

a transmitting section that transmits the random access burst generated.

2. The radio transmitting apparatus according to claim 1, wherein the random access burst transmission control section sequentially alleviates the conditions under which a signature is allocated to the radio transmitting apparatus in a slot following the slot including the signature allocated by the network side.

3. The radio transmitting apparatus according to claim 1, wherein, when the network side allocates signatures in descending order of orthogonality, the random access burst transmission control section restricts conditions for allocating a signature to the radio transmitting apparatus more when the number of signatures allocated by the network side increases or alleviates the conditions for allocating a signature to the radio transmitting apparatus more when the number of signatures allocated by the network side decreases.

4. A radio transmission method comprising:

an random access burst transmission controlling step of restricting conditions for allocating a signature to a radio transmitting apparatus more when the number of signatures allocated by a network side, which is a communicating party, to other radio communication terminal apparatuses increases, or alleviating the conditions for allocating a signature to the radio transmitting apparatus more when the number of signatures allocated by the network side to the other radio communication terminal apparatuses decreases;

an random access burst generating step of generating a random access burst including a signature when the condition is satisfied; and

a transmitting step of transmitting the random access burst generated.