Random access method, radio communication terminal device, receiving method, and base station apparatus

• US 9,615,359 B2
• Filed: 05/24/2016
• Issued: 04/04/2017
• Est. Priority Date: 03/09/2004
• Status: Active Grant

• Current Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Original Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Inventors: Cheng, Jun, Nishio, Akihiko, Miyoshi, Kenichi
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): LEE, ANDREW CHUNG CHEUNG
• Application Number:
  US15/162,662
• Publication Number:
  US 20160270067A1
• Time in Patent Office: 315 Days
• CPC Class Codes: H04W 36/16 Performing reselection for specific purposes
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Random access technology is provided for establishing an individual channel between a radio communication terminal device and a base station device in a short time and a radio communication terminal device executing the random access method. A RACH sub-channel allocation unit allocates a transmission packet input from a replication unit to an arbitrary sub-carrier at the RACH arbitrary time slot at random. An allocation unit judges whether an overlap is generated in the allocation result obtained by the RACH sub-channel allocation unit.

Claims

1. A terminal apparatus comprising:

a receiver configured to receive control information transmitted from a base station apparatus;

signal generating circuitry configured to generate, based on received information from the base station apparatus, a random access signal requesting service from the base station apparatus and including a number of duplicated random access sequences, where the number of duplicated random access sequences is based on the control information received in advance from the base station apparatus; and

a transmitter configured to transmit the random access signal, from the terminal apparatus to the base station apparatus over a random access channel, without waiting for a response from the base station apparatus to confirm whether any of the duplicated random access sequences has been received at the base station apparatus.

2. The terminal apparatus in claim 1, wherein the control information indicates a number of terminal apparatuses belonging to a cell associated with the base station apparatus.

3. The terminal apparatus in claim 2, wherein the signal generating circuitry is configured to determine the number of terminal apparatuses belonging to a cell from the control information.

4. The terminal apparatus in claim 2, wherein as the number of terminal apparatuses belonging to the cell increases, the number of duplicated random access sequences decreases.

5. The terminal apparatus in claim 1, wherein the duplicated random access sequences includes a random access sequence repeated successively in a time domain.

6. The terminal apparatus in claim 1, wherein the transmitted random access signal includes one of the duplicated random access sequences in one time slot and another of the duplicated random access sequences in a second, different time slot.

7. The terminal apparatus in claim 1, wherein the random access channel includes one or more of a time slot, frequency, or spreading code.

8. The terminal apparatus in claim 1, wherein two of the duplicated random access sequences are consecutive in the time domain.

9. The terminal apparatus in claim 1, wherein the transmitter is configured to transmit the random access signal on at least two consecutive time slots.

10. The terminal apparatus in claim 1, wherein the number of duplicated random access sequences depends on a priority associated with the terminal apparatus.

11. A method implemented in a terminal comprising:

receiving control information transmitted from a base station apparatus;

generating, based on received information from the base station apparatus, a random access signal requesting service from the base station apparatus and including a number of duplicated random access sequences, where the number of duplicated random access sequences is based on the control information received in advance from the base station apparatus; and

transmitting the random access signal, from the terminal apparatus to the base station apparatus over a random access channel, without waiting for a response from the base station apparatus to confirm whether any of the duplicated random access sequences has been received at the base station apparatus.

12. The method in claim 11, wherein the control information indicates a number of terminal apparatuses belonging to a cell associated with the base station apparatus.

13. The method in claim 12, further comprising determining the number of terminals belonging to a cell from the control information.

14. The method in claim 12, wherein as the number of terminals apparatuses belonging to the cell increases, the number of duplicated random access sequences decreases.

15. The method in claim 11, wherein the duplicated random access sequences includes a random access sequence repeated successively in a time domain.

16. The method in claim 11, wherein the transmitted random access signal includes one of the duplicated random access sequences in one time slot and another of the duplicated random access sequences in a second, different time slot.

17. The method in claim 11, wherein the random access channel is associated with radio resources, the method further comprising transmitting the random access signal using a radio resource selected at random from radio resource candidates.

18. The method in claim 11, wherein two of the duplicated random access sequences are consecutive in the time domain.

19. The method in claim 11, further comprising transmitting the random access signal on at least two consecutive time slots.

20. The method in claim 11, wherein the number of duplicated random access sequences also depends on a priority associated with the terminal apparatus.