Method and apparatus for transmitting or detecting a primary synchronization signal

Patent metadata

Field	Value
Publication number	US-9584244-B2
Application number	US-201514617629-A
Country	US
Kind code	B2
Filing date	Feb 9, 2015
Priority date	Dec 19, 2006
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A method and apparatus for transmitting or detecting primary synchronization signal. The receiver receives primary synchronization signal from a transmitter, and detects the sequence used in the received primary synchronization signal by using three root indexes. Here, the primary synchronization signal is generated by using a Zadoff-Chu sequence having one of the three root indexes. The three root indexes comprise a first index and a second index, and a sum of the first index and the second index corresponds to the length of the Zadoff-Chu sequence.

First claim

What is claimed is:

1. A method of detecting a sequence used in a primary synchronization signal by a receiver in a mobile communication system, the method comprising:
receiving the primary synchronization signal from a transmitter; and
detecting the sequence used in the received primary synchronization signal,
wherein the sequence used in the primary synchronization signal corresponds to a sequence having an even number length, the sequence being mapped on a frequency domain such that one half of the sequence is mapped before a DC frequency and the other half of the sequence is mapped after the DC frequency, and
wherein the sequence mapped on the frequency domain is generated by using Zadoff-Chu sequence having an odd number length.

2. The method of claim 1 ,
wherein the sequence mapped on the frequency domain from the Zadoff-Chu sequence is generated based on a following equation:

exp
⁡

(

-
ⅈ

⁢

M
⁢

⁢
π
⁢

⁢

n
⁡

(

n
+
1

)

N

)

,

and
wherein the odd number length of the Zadoff-Chu sequence is “N”, “M” is a root index of the Zadoff-Chu sequence, and “n” is an index of each of a plurality of constituent components of the generated sequence.

3. The method of claim 2 , wherein N is 63, and the even number length is 62.

4. The method of claim 3 ,
wherein a first 31 constituent components of the sequence that are mapped on the frequency domain are continuously mapped to a plurality of frequency resource elements corresponding to frequency resource element indices within a range of “−31” to “4,” and
wherein a last 31 constituent components of the sequence mapped on the frequency domain are continuously mapped to a plurality of frequency resource elements corresponding to frequency resource element indices within a range of “1” to “31”.

5. The method of claim 1 , wherein the sequence is detected by using 3 root indexes.

6. A receiver configured to detect a sequence used in a received (Rx) signal in a mobile communication system using orthogonal frequency division multiplexing (OFDM), the receiver comprising:
a radio frequency module configured to receive the Rx signal from a transmitter; and
a detector configured to detect the sequence used in the Rx signal,
wherein the sequence used in the Rx signal is generated in a frequency domain by using a Zadoff-Chu sequence having an index from a predetermined index set,
wherein the predetermined index set comprises a first index and a second index, and
wherein a sum of the first index and the second index corresponds to a length of the Zadoff-Chu sequence.

7. The receiver according to claim 6 ,
wherein the Zadoff-Chu sequence has an odd number length, and
wherein an equation for generating the sequence from the Zadoff-Chu sequence is based on the following equation:

exp
⁡

(

-
ⅈ

⁢

M
⁢

⁢
π
⁢

⁢

n
⁡

(

n
+
1

)

N

)

,

and
wherein the length of the Zadoff-Chu sequence is “N”, “M” is a root index of the Zadoff-Chu sequence, and “n” is index of each of constituent components of the generated sequence.

8. The receiver according to claim 7 , wherein “N” is 63, the first index is 34, and the second index is 29, respectively.

9. The receiver according to claim 6 , wherein the Rx signal is a P-SCH (Primary-SCH) signal.

10. The receiver according to claim 6 , wherein the receiver is configured to perform synchronization with a transmitter based on the sequence detection performed on the Rx signal.

Assignees

• Lg Electronics Inc

Inventors

• Han Seung Hee
• Noh Min Seok
• Kwon Yeong Hyeon
• Lee Hyun Woo
• Kim Dong Cheol
• Kwak Jin Sam

Classifications

• H04L27/2614

  Peak power aspects · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L25/0226

  sounding signals per se · CPC title

• H04L27/2657

  Carrier synchronisation · CPC title

• H04L27/2605

  Symbol extensions, e.g. Zero Tail, Unique Word [UW] · CPC title