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Method and Apparatus for Interrupt Arbitration in a Multi-Core System

IP.com Disclosure Number: IPCOM000246064D
Publication Date: 2016-May-02
Document File: 3 page(s) / 165K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method of handling different antenna sampling rates on a single CPRI link is disclosed. A CPRI based wireless base-station system involves multiple REC and RE nodes. A CPRI unit includes a "framer" module that handles the transmission and reception of all IQ data, and a DMA (direct memory access) module associated with the framer that transfers receive and transmit IQ data to and from antenna carrier buffers in a memory.

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Method and Apparatus for Interrupt Arbitration in a Multi-Core System

  Abstract- A method of handling different antenna sampling rates on a single CPRI link is disclosed. A CPRI based wireless base-station system involves multiple REC and RE nodes. A CPRI unit includes a "framer" module that handles the transmission and reception of all IQ data, and a DMA (direct memory access) module associated with the framer that transfers receive and transmit IQ data to and from antenna carrier buffers in a memory.

        I. BACKGROUND
his paper discusses the use a single CPRI unit to support multiple bandwidth antenna data, which allows a DSP system to use the remaining CPRI units

to support more nodes. It also does not stop local traffic on any other CPRI unit, so there is efficient utilization of the internal DMA buffer.

    A CPRI based wireless base-station system involves multiple REC and RE nodes. A CPRI unit includes a "framer" module which handles the transmission and reception of all IQ data, and a DMA (direct memory access) module associated with the framer that transfers receive and transmit IQ data to and from antenna carrier buffers in a memory.

   In most cases, the sampling rates of all Antennas in a CPRI unit are the same. A single CPRI unit will normally support only one antenna sample rate. If different sampling rates need to be supported then the following methods are used: • To employ 3 CPRI units: In this case the framer of one CPRI unit transfers data with first sampling rate to/from the system memory, the framer of the third CPRI unit transfers data with second sampling rate to/from the system memory. The framer of the second unit is used to transfer data between the first and third framer directly. This scheme is shown in Figure 1.

Figure 1: Three Lane solution

T

• To employ 2 CPRI units: In this case the framer of one CPRI unit transfers data with first sampling rate to/from the system memory. The same framer also sends second bandwidth data to the DMA of the second CPRI unit. The second unit DMA transfers this data to the system memory.

Figure 2: Two Lane solution

In both the cases mentioned additional CPRI units are utilized to handle different bandwidth data. This reduced the total number of nodes that can be supported by a DSP system with multiple CPRI units/links.


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B.Up-Link data handling

Figure 5: UL data handling in proposed solution

 C.Buffer allocation for Antennas per Bandwidth • The internal buffer space for both BW0 and BW1 AxCs is a maximum...