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

• Current Assignee: Innowireless Co., Ltd.
• Original Assignee: Innowireless Co., Ltd.
• Inventors: Joung, Jin-Soup, Lee, Joo-Hyeong, Kim, Tae-Beom
• Granted Patent: US 9,680,586 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2370/14 Use of low voltage differential signaling [LVDS] for display data communication
• CPC Class Codes: H04J 3/047 Distributors with transistors or integrated circuits
• CPC Class Codes: H04J 3/0682 by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/0078 Timing of allocation
• CPC Class Codes: H04L 5/1469 using time-sharing

Abstract

Provided is a method for controlling a time division duplexing (TDD) Tx/Rx switching timing in a cloud radio access network (CRAN) that can finely control a switching timing between transmission and reception of TDD signals with an additional component added to a digital unit (DU) and a radio unit (RU) in the CRAN.

Claims

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.

2. The method of claim 1, wherein the determining of the boundary comprises checking the boundary of the wireless frame signal using a sync&

timing subchannel for each hyper frame of the wireless frame signal transmitted from the DU.

3. The method of claim 1, wherein each of the CPRI_OBSAI_frame_timer and WiMAX_E-UTRA_frame_timer is configured using a timer with an error of less than 10 ns.

4. The method of claim 2, wherein each of the CPRI_OBSAI_frame_timer and WiMAX_E-UTRA_frame_timer is configured using a timer with an error of less than 10 ns.