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¿µ¹®Ç¥Áظí A Framework for the Control of Wavelength Switched Optical Networks (WSONs) with Impairments
Çѱ۳»¿ë¿ä¾à WSONÀº ½ºÀ§ÄªÀÌ ±¤ ½ÅÈ£ÀÇ Á᫐ ÆÄÀå¿¡ µû¶ó ¼±ÅÃÀûÀ¸·Î ¼öÇàµÇ´Â ÆÄÀå ºÐÇÒ ´ÙÁßÈ­(WDM, Wavelength Division Multiplexing) ±â¹ÝÀÇ ±¤ ³×Æ®¿öÅ©ÀÌ´Ù.
±¤ ½ÅÈ£´Â °æ·Î¸¦ µû¶ó ÁøÇàµÇ¸ç, ±¤ ¼¶À¯ ¹× ÀåºñÀÇ ´Ù¾çÇÑ ¹°¸®Àû ÇÁ·Î¼¼½º·Î ÀÎÇØ º¯°æµÉ ¼ö ÀÖ´Ù. ÀÌ·¯ÇÑ °úÁ¤À¸·Î ÀÎÇØ ±¤ ½ÅÈ£°¡ °¨¼ÒµÈ´Ù¸é, ÀÌ·¯ÇÑ °úÁ¤À» º¸Åë ¡°¼Õ½Ç(impairments)¡±ÀÌ¶ó ¸»ÇÑ´Ù. ±¤ ¼Õ½ÇÀº »ç¿ëµÇ´Â ¼¶À¯ÀÇ Á¾·ù, °¢Á¾ ±¤ÇÐ ÀåºñÀÇ ¹èÄ¡, ½ÅÈ£ÀÇ °æ·Î¿¡ µû¶ó ¼¶À¯ ¼¼±×¸ÕÆ®¸¦ °øÀ¯ ÇÏ°í ÀÖ´Â ´Ù¸¥ ±¤ ½ÅÈ£ÀÇ Á¸Àç¿¡ ÀÇÇØ ¿µÇâÀ» ¹Þ´Â´Ù. ¼Õ½Ç·Î ÀÎÇÑ ±¤ ½ÅÈ£ÀÇ °¨¼Ò´Â ½É°¢ÇÑ ºñÆ® ¿À·ùÀ²À» À¯¹ß Çϰųª ¼ö½ÅµÈ ½ÅÈ£¸¦ °¨Áö Çϰųª º¹Á¶Çϴµ¥ ½ÇÆÐ ÇÒ ¼ö ÀÖ´Ù.
WSONÀ» ÅëÇØ ±¤ ¿¬°áÀ» Á¦°øÇϱâ À§Çؼ±, °æ·Î ¿¬¼Ó¼º, ÀÚ¿ø °¡¿ë¼º, ¼Õ½Ç Á¦¾àÀÌ ³×Æ®¿öÅ©¸¦ ÅëÇÑ °¡´ÉÇÑ ÃÖÀûÀÇ °æ·Î¸¦ °áÁ¤Çϱâ À§ÇØ ÃæÁ· µÇ¾î¾ß ÇÑ´Ù. ÇØ´ç °æ·ÎÀÇ °áÁ¤Àº IA-RWA(Impairment-Aware Routing and Wavelength Assignment)·Î ¾Ë·ÁÁ® ÀÖ´Ù.
GMPLS(Generalized Multi-Protocol Label Switching)[RFC3945]´Â ÆÐŶ ½ºÀ§ÄªÀÌ °¡´ÉÇÑ ³×Æ®¿öÅ©¿¡¼­ºÎÅÍ ½Ã°£ ºÐÇÒ ´ÙÁßÈ­ ¹× WDMÀ» »ç¿ëÇÏ´Â ³×Æ®¿öÅ©¿¡ À̸£±â±îÁö ³×Æ®¿öÅ©¸¦ ¿î¿µÇÏ´Â µ¥ »ç¿ëÇÒ ¼ö ÀÖ´Â Á¦¾î Æò¸é ÇÁ·ÎÅäÄÝÀÇ ÁýÇÕÀ» Á¦°ø ÇÑ´Ù.
ÀÌ ¹®¼­´Â WSON¿¡ ´ëÇÑ IA-RWAÀÇ Á¦¾î ¹× ¿î¿µ¿¡ GMPLS ÇÁ·ÎÅäÄÝ ¹× PCE ±¸Á¶¸¦ Àû¿ëÇϱâ À§ÇÑ ÇÁ·¹ÀÓ¿öÅ©¸¦ Á¦°øÇÑ´Ù. ÀÌ·¯ÇÑ Æò°¡¸¦ À§ÇØ, ÀÌ ¹®¼­´Â GMPLS¿Í PCE ½Ã½ºÅÛ¿¡¼­ »ç¿ëÇϱâ À§ÇÑ Á¤º¸ ¿ä±¸»çÇ×À» ½Äº° ÇÒ ¼ö ÀÖµµ·Ï WSONÀ» ±¸¼ºÇÏ´Â ¼­ºê ½Ã½ºÅÛ ¹× ÇÁ·Î¼¼½ºÀÇ °³¿ä¸¦ Á¦°øÇÏ°í ÇØ´ç ITU-T ±Ç°í¿¡ µû¶ó IA-RWA ¸ðµ¨À» ¼³¸íÇÑ´Ù. ÀÌ·Î ÀÎÇØ GMPLS¿Í PCE ÇÁ·ÎÅäÄÝ Á¦Ç°±º¿¡¼­ IA-RWAÀ» Áö¿øÇÏ´Â ÇÁ·ÎÅäÄÝ È®ÀåÀÇ °³¹ßÀ» ÃËÁø ÇÒ ¼ö ÀÖÀ» °ÍÀ¸·Î ±â´ëµÈ´Ù.
¿µ¹®³»¿ë¿ä¾à As an optical signal progresses along its path, it may be altered by the various physical processes in the optical fibers and devices it encounters. When such alterations result in signal degradation, these processes are usually referred to as "impairments". These physical characteristics may be important constraints to consider when using a GMPLS control plane to support path setup and maintenance in wavelength switched optical networks.
This standard provides a framework for applying GMPLS protocols and the Path Computation Element(PCE) architecture to support Impairment-Aware Routing and Wavelength Assignment(IA-RWA) in wavelength switched optical networks. Specifically, this document discusses key computing constraints, scenarios, and architectural processes: routing, wavelength assignment, and impairment validation. This document does not define optical data plane aspects; impairment parameters; or measurement of, or assessment and qualification of, a route; rather, it describes the architectural and information components for protocol solutions.
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