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Current Result Document :
ÇѱÛÁ¦¸ñ(Korean Title) |
CDMA ȸ¼± µ¥ÀÌÅÍ ¼ºñ½º¸¦ ÀÌ¿ëÇÑ CDMA¸Á°ú PSTN ¸Á°£ÀÇ À½¼º Àü¼Û¿¡ °üÇÑ ¿¬±¸ |
¿µ¹®Á¦¸ñ(English Title) |
The Research about Voice Transmission between CDMA Network and PSTN Network Using CDMA Circuit Data Service |
ÀúÀÚ(Author) |
¹Ú¿ë¼®
¾ÈÀçȯ
·ùÀçö
Yong-Seok Park
Jaehwan Ahn
Jae-Cheol Ryou
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¿ø¹®¼ö·Ïó(Citation) |
VOL 15-C NO. 05 PP. 0367 ~ 0374 (2008. 10) |
Çѱ۳»¿ë (Korean Abstract) |
CDMA À̵¿´Ü¸»±â¿Í PSTN ´Ü¸»±â°£ÀÇ À½¼º ¾ÏÈ£¸¦ ½ÇÇöÇϱâ À§Çؼ´Â EVRC À½¼º ÇÁ·¹ÀÓÀÌ µÎ ÀÌÁ¾¸Á°£¿¡ ½ÅÈ£ º¯È¯ ¾øÀÌ Àü¼ÛµÇ¾î¾ß ÇÑ´Ù. ±âÁ¸¿¡ ÀÌ¹Ì ¼³Ä¡µÇ¾î ÀÖ´Â »ó¿ë¸ÁÀÇ ¼öÁ¤ ¾øÀÌ ÀÌ·¯ÇÑ ¿ä±¸ Á¶°ÇÀ» ¸¸Á·Çϱâ À§ÇØ, º» ³í¹®¿¡¼´Â À½¼º ÇÁ·¹ÀÓÀ» CDMA ȸ¼± µ¥ÀÌÅÍ Ã¤³ÎÀ» ÅëÇØ ½Ç½Ã°£À¸·Î Àü¼ÛÇÏ´Â ±â¹ýÀ» Á¦¾ÈÇÑ´Ù. CDMA ȸ¼± µ¥ÀÌÅÍ Ã¤³ÎÀ» ÅëÇØ À½¼ºÀ» Àü¼ÛÇÏ´Â °úÁ¤¿¡¼ ¹ß»ýÇÏ´Â Àü¼Û Áö¿¬ÀÇ ¿øÀÎÀ» ºÐ¼®ÇÏ¿´°í ÀÌ·¯ÇÑ À½¼º Àü¼Û Áö¿¬À» ±Øº¹Çϱâ À§ÇØ TCP control flags Á¦¾î±â¹ý°ú º¸ÄÚ´õ Ãâ·Â ¼Óµµ¿¡ µû¸¥ °¡º¯ À½¼º ºí·Ï ±¸¼º ¾Ë°í¸®ÁòÀ» Á¦¾ÈÇÏ¿´´Ù. Á¦¾ÈÇÑ ¹æ¹ýÀ» Àû¿ëÇÏ¿© ½ÇÇèÇÑ °á°ú Àü¼Û Áö¿¬ÀÌ Æò±Õ 2ÃÊ¿¡¼ 570ms·Î ¾à 70%Á¤µµ °³¼±µÊÀ» È®ÀÎÇÏ¿´´Ù.
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¿µ¹®³»¿ë (English Abstract) |
To realize the voice privacy between CDMA mobile phone and PSTN terminal, the voice frames shall be transmitted transparently between the heterogeneous networks. For satisfying this requirement, we propose the method which transmits voice frames using the CDMA circuit data channel in real time. In this paper we analyze the causes of voice delay which occurs during voice transmission using circuit data channel. And in order to overcome this kind of delay, the technique controlling the TCP control flag and the variable audio block construction algorithm according to the vocoder output rate are proposed. As a result of experimenting by applying the proposed method, we confirmed that the transit delay was improved with about average 70%.
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Å°¿öµå(Keyword) |
CDMA ȸ¼± µ¥ÀÌÅÍ ¼ºñ½º
PSTN
À½¼º ¾ÏÈ£
À½¼º Àü¼Û Áö¿¬
CDMA circuit data service
PSTN
Voice Encryption
Voice Transmission delay
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