Question: In UTRAN Iur interface RNSAP signalling for TDD cells with a chip rate of 1.28 Mcps, how is the Sync Case indication handled when included in a message from DRNC to SRNC?
Option 1: The DRNC must indicate Sync Case 2, and the SRNC must apply it accordingly.
Option 2: The DRNC may choose between indicating Sync Case 1 or Sync Case 2, with the SRNC honoring the selection.
Option 3: The inclusion of Sync Case indication is mandatory for all TDD configurations, including 1.28 Mcps.
Option 4: The DRNC shall indicate Sync Case 1, but the SRNC shall ignore this indication for 1.28 Mcps TDD.
Explanation: For 1.28 Mcps TDD in UTRAN Iur interface RNSAP signalling, there is no actual need for a Sync Case indication. However, if such an indication must be included, the DRNC indicates Sync Case 1 as a placeholder, with the SRNC disregarding this information for 1.28 Mcps TDD cells, ensuring compatibility and avoiding potential signaling conflicts.