Random access preamble structure in extended cells environment

Patent metadata

Field	Value
Publication number	US-9450796-B2
Application number	US-52312508-A
Country	US
Kind code	B2
Filing date	Jan 4, 2008
Priority date	Jan 4, 2007
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

Provided is a method of forming a random access preamble structure for an extended cell radius in a cellular system, the method including: generating a cyclic prefix (CP), which is the sum of a maximum delay spread and the maximum round trip delay according to the extended cell; generating a preamble sequence part. The method is used to form a preamble structure for an extended cell radius from among random access preamble structures transmitted when initial synchronization is achieved, when synchronization is lost, or when a handover is performed, during a random access process of the cellular system.

First claim

The invention claimed is:

1. A method of forming a random access preamble in a cellular system, the method comprising:
receiving preamble generation information from a base station;
determining a cyclic prefix among a plurality of cyclic prefixes having different lengths based on the preamble generation information, wherein a length of the cyclic prefix is given as a product of a second predetermined length and a second integer, and the second integer is determined by the preamble generation information, wherein the cyclic prefix has a length that ranges from about 202 μs to about 684 μs;
determining a preamble sequence part among a plurality of preamble sequence parts having different lengths based on the preamble generation information, wherein a length of the preamble sequence part is given as a product of a first predetermined length and a first integer, wherein the first integer is determined by the preamble generation information, and wherein the preamble sequence part has a length that is selected from among 24576×Ts, 2×24576×Ts, and 3×24576×Ts, and Ts is a sampling time; and
generating a random access preamble by combining the determined cyclic prefix and the determined preamble sequence part.

2. The method of claim 1 , wherein the length of the cyclic prefix is determined by a sum of a maximum delay spread and a maximum round trip delay.

3. A method of forming a random access preamble in a cellular system, the method comprising:
receiving preamble generation information from a base station;
generating a cyclic prefix based on the preamble generation information, wherein a length of the cyclic prefix is given as a product of a second predetermined length and a second integer, and the second integer is determined by the preamble generation information, wherein the cyclic prefix has a length that ranges from about 202 μs to about 684 μs;
generating a preamble sequence part having a length that is given as a product of a first predetermined length and a first integer, wherein the first integer is determined by the preamble generation information, and wherein the preamble sequence part has a length that is selected from among 24576×Ts, 2×24576×Ts, and 3×24576×Ts, and Ts is a sampling time; and
generating a random access preamble by combining the determined cyclic prefix and the determined preamble sequence part.

4. The method of claim 3 , wherein the preamble generation information determines a cyclic prefix among a plurality of cyclic prefixes having different lengths and a preamble sequence part among a plurality of preamble sequence parts having different lengths.

5. The method of claim 3 , wherein the length of the cyclic prefix is determined by a sum of a maximum delay spread and a maximum round trip delay.

6. An apparatus for generating a random access preamble, the apparatus comprising:
a cyclic prefix generator configured to determine a cyclic prefix among a plurality of cyclic prefixes having different lengths based on preamble generation information, wherein a length of the cyclic prefix is given as a product of a second predetermined length and a second integer, and the second integer is determined by the preamble generation information, wherein the cyclic prefix has a length that ranges from about 202 μs to about 684 μs;
a preamble sequence part generator configured to determine a preamble sequence part among a plurality of preamble sequence parts having different lengths based on the preamble generation information, wherein a length of the preamble sequence part is given as a product of a first predetermined length and a first integer, wherein the first integer is determined by the preamble generation information, and wherein the preamble sequence part has a length that is selected from among 24576×Ts, 2×24576×Ts, and 3×24576×Ts, and Ts is a sampling time; and
a random access preamble generator configured to generate a random access preamble by combining the determined cyclic prefix and the determined preamble sequence part,
wherein the preamble generation information is provided by a base station.

7. The apparatus of claim 6 , wherein the length of the cyclic prefix is determined by a sum of a maximum delay spread and a maximum round trip delay.

8. An apparatus for generating a random access preamble, the apparatus comprising:
a cyclic prefix generator configured to generate a cyclic prefix based on preamble generation information, wherein a length of the cyclic prefix is given as a product of a second predetermined length and a second integer, and the second integer is determined by the preamble generation information, wherein the cyclic prefix has a length that ranges from about 202 μs to about 684 μs;
a preamble sequence part generator configured to generate a preamble sequence part having a length that is given as a product of a first predetermined length and a first integer, wherein the first integer is determined by the preamble generation information, and wherein the preamble sequence part has a length that is selected from among 24576×Ts, 2×24576×Ts, and 3×24576×Ts, and Ts is a sampling time; and
a random access preamble generator configured to generate a random access preamble by combining the determined cyclic prefix and the determined preamble sequence part,
wherein the preamble generation information is provided by a base station.

9. The apparatus of claim 8 , wherein the preamble generation information determines a cyclic prefix among a plurality of cyclic prefixes having different lengths and a preamble sequence part among a plurality of preamble sequence parts having different lengths.

10. The apparatus of claim 8 , wherein the length of the cyclic prefix is determined by a sum of a maximum delay spread and a maximum round trip delay.

Assignees

• Lee Moon-Sik
• Jwa Hye-Kyung
• Yi Hyoseok
• Kim Young-Hoon
• Bang Seung-Chan
• Electronics & Telecommunications Res Inst
• Samsung Electronics Co Ltd

Inventors

• Lee Moon-Sik
• Jwa Hye-Kyung
• Yi Hyoseok
• Kim Young-Hoon
• Bang Seung-Chan

Classifications

• H04L27/2607 Primary

  Cyclic extensions · CPC title

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04L69/323

  in the physical layer [OSI layer 1] · CPC title

• H04W74/004

  in the uplink, i.e. towards network · CPC title