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¿µ¹® Ç¥Áظí Remote Radio Unit Interface - Requirements for Open Radio equipment Interface
ÇÑ±Û ³»¿ë¿ä¾à º» Ç¥ÁØÀº RU¿Í DU °£ ÀÎÅÍÆäÀ̽ºÀÇ ¿ä±¸ »çÇ×À» ´ÙÀ½°ú °°ÀÌ Á¤ÀÇÇÑ´Ù.

- Áö¿ø °¡´ÉÇÑ ½Ã½ºÅÛ ÅäÆú·ÎÁö´Â ´ÜÀÏ È©(hop), üÀÎ(chain), ¸µ(ring), Æ®¸®(tree)ÀÓ.
- Áö¿ø °¡´ÉÇÑ ¹«¼± ±Ô°ÝÀº UTRA-FDD, E-UTRA-FDD, E-UTRA-TDDÀ̸ç, UTRA-FDD¿Í E-UTRA-FDD°£ÀÇ ´ÙÁßÈ­µµ Áö¿øÇÔ.
- ÇÁ·ÎÅäÄÝ ¿ä±¸ »çÇ× : CPRI¿ÍÀÇ È£È¯¼ºÀÌ À¯ÁöµÇ¾î¾ß Çϸç, Á¦¾î ¹× °ü¸®¸¦ À§ÇÑ ÇÁ·ÎÅäÄÝ ½ºÅðú RE ¸®¼Ò½º °ü¸®, RE ¿À·ù °ü¸® µîÀ» Áö¿øÇÔ.
¿µ¹® ³»¿ë¿ä¾à This standard specifies the requirements of interface between RU and DU as follows;

- Reference system topologies: single hop, chain, ring, and tree
- Supported radio standards: UTRA-FDD, E-UTRA-FDD, E-UTRA-TDD, and Multiplexing between UTRA-FDD and E-UTRA-FDD on a link
- Protocol requirements: The standard shall be compliant with all of the requirements in CPRI and shall support C&M protocol stack, RE resource management, and RE fault management.
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