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METHOD OF CONTROLLING TDD TX/RX SWITCHING TIMING IN CLOUD RADIO ACCESS NETWORK

  • US 20150295699A1
  • Filed: 05/22/2014
  • Published: 10/15/2015
  • Est. Priority Date: 04/15/2014
  • Status: Active Grant
First Claim
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1. A method of controlling a time division duplexing (TDD) Tx/Rx switching timing in a cloud radio access network (CRAN) in which at least one radio unit (RU) including an RU_CPRI_OBSAI_frame_timer and an RU_WiMAX_E-UTRA_frame_timer is connected with a digital unit (DU) having a DU_CPRI_OBSAI_frame_timer and a DU_WiMAX_E-UTRA_frame_timer, the method comprising:

  • determining, by each RU, a boundary of a wireless frame signal transmitted from the DU to synchronize the RU_CPRI_OBSAI_frame_timer with the DU_CPRI_OBSAI_frame_timer, the DU being connected with the RU;

    updating, by each RU, the RU_CPRI_OBSAI_frame_timer based on link delay information delivered from the DU;

    updating, by each RU, WiMAX_E-UTRA frame timing information based on information about a difference between a CPRI_OBSAI frame timing and a WiMAX_E-UTRA frame timing, delivered from the DU; and

    controlling a TDD Tx/Rx switching timing by replacing Tx/Rx switching timing information for each antenna carrier AxC delivered from the DU to the RU_CPRI_OBSAI_frame_timer and the RU_WiMAX_E-UTRA_frame_timer.

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