The ASNSDK MCE has been especially designed to be embedded in UMTS Mobile equipment for the implementation of the RRC protocol. It includes a very small memory basic unaligned ASN.1 PER (Packed Encoding Rules) encoding/decoding engine providing a C API.

With less than 2Kbytes RAM and 130Kbytes ROM memory space required to process the whole UMTS RRC protocol, the MCE ASN.1 PER engine gives you the capital advantage to significantly save RAM and ROM for the development of added-value user application.

Its powerful capacity to directly fit to the user application data structures, without imposing its own intermediate data structures, ensures you to save intermediate memory allocation and CPU time consumption. (cf. Technical overview)


Very Efficient management of Memory Space

Through a user callbacks mechanism, the MCE ASN.1 PER provides the ability to directly fit to the user application data structures without imposing intermediate C data structures, thus saving:

• User application source code for processing intermediate structures,
• RAM used to store these intermediate data structures,
• CPU time consumption for managing and copying intermediate data structures into application data structures.

Moreover, a particular attention has been brought in the design of the MCE ASN.1 PER runtime in order to favor the use of ROM instead of RAM.
In order to reduce the memory space required as far as possible, the MCE ASN.1 PER runtime has been optimized to only support the reduce set of basic ASN.1 types and features used in the definition of the UMTS RRC protocol.


Strict control of system resources

The user application fully controls the memory allocation. The MCE ASN.1 PER runtime does not allocate or release dynamic memory.
To prevent system stack overflow, as ASN.1 values encoding/decoding is highly recursive, the MCE ASN.1 PER runtime manages its own private stack. The depth and the size of this stack is computed by the ASN.1 compiler, thus the corresponding RAM is allocated at once when running the MCE ASN.1 PER runtime.
To save CPU time consumption and intermediate memory allocation, data to be decoded, can be directly read from a user-specified input thanks to a customizable «stream» concept. In the same way, encoded data can be directly written to a user-specified output.


Portable on any processor, real-time OS and C compiler

The MCE ASN.1 PER runtime has been developed following strict C coding rules taking benefits of our twelve years experience in the porting of our ASN.1 and Network protocols stack products on numerous embedded environments. All C data types and system calls can be easily customized to fit your own operating system and hardware environment. The MCE ASN.1 PER runtime is fully re-entrant in order to run on multi-threads system.