Android RIL, RIL Test Tool, Android porting

Android RIL

A Radio Interface Layer (RIL) is a layer in a Mobile System which provides an interface to the modem and works with network to provide mobile services management. In standard Android system a common framework is provided for RIL expecting specific OEM RIL to be developed to address specific modem chips and operator networks. Typically a modem chip vendor or ODM require this OEM RIL to be included in the System. As multiple modems are becoming part of phones to support various technologies for global access RIL has to be created to support multimode in single chip or multi chip configurations.

There are many challenges involved in integrating multiple modems into the open-source platforms employed by today’s Smartphones. Among them is the fact that integrating Android towards different modem silicon and the required telephony stack extensions to fulfill all operator requirements is not an “out-of-the-box” solution. Additional issues are posed by the customizations demanded by the device OEMs and variations in interface method and protocols used by different modem vendors.

Due to our experience in developing RIL for LTE and experience with other 4G technologies like WiMAX, we help you tackle these challenges by providing you with full telephony support, i.e. Radio Interface Layer (RIL), Virtual network interfaces on Android to service various applications using telephony or data networks for voice and data applications.

Our Multi mode RIL services based solution for LTE & CDMA is designed to handle any individual specific requirements for chips or networks. Android being an open framework system constantly evolves all of our design decisions based on how to maximum use of design and implementation already available in Android framework. Our design practices helps to have things easily upgradeable as Android ecosystem as well as standard RIL’s available for various modems grows upwards.

Our RIL services exposure covers all use cases of roaming and switching between CDMA/LTE based on audio and data requirements with CS Fallback system which is prominent mode as of today in industry and supports multimode RIL for dual chip environment. The Multimode RIL design is capable of enabling VoLTE or other innovations that will happen going forward in 4G space.

We provide solutions for:

	Design and implementation of the LTE, GSM and CDMA Vendor RIL for your target silicon
	Extension of the Android middleware and telephony stack to fulfill your target operator requirements
	System integration and validation

Our expertise in Android includes:

	The entire Android telephony stack including the Vendor RIL (Radio Interface Layer)
	System design to add new telephony functionality in Android including the telephony manager
	Android middleware extensions
	Enhancement, development or customization of service layer components
	Development and validation of applications
	Test & Verification services for Android

Our critical know-how in Android Vendor RIL development and deep knowledge of handling 4G RIL together with legacy 3G RIL components, can help integrate and customize RIL for LTE & CDMA for any silicon vendor chipset. Employing our advanced test tools and processes we will deliver on time and on budget.

RIL Test Tool

The biggest challenge is the time to get hands on network and test equipment from major test equipment providers for day to day development.

As part of SAAS, WhizNets has developed a multimode AT emulator/tester platform to replace modem and network. This platform provides a mechanism wherein the development team need not depend on the availability of the hardware, but can make the robust testing of software and the telephony features using the Android emulator without getting into the complexity of modem and network and go to lab and do the RF test equipment testing with real modem and in operators lab network with confidence.

Emulator can be programmed for multiple use cases expected from the modem and network as a combination to ensure all the subsystems above using the AT interface is done correctly. Various positive and negative test cases along with various network request response sequences can be generated to have an independently tested framework of software using modem AT interface.

Advantages

When No Network is available: Simulator helps to validate the RIL from data connectivity perspective. Using this we can develop the RIL offline and can later perform the testing with actual network.

OEM vendor developing the RIL for particular modem with specific operator can easily simulate the operator requirement using AT simulator package and can validate the RIL.

When no actual hardware is available: Simulator helps to validate the RIL even when no actual hardware is available.

Chip developer developing the Radio chip can easily simulate the chip specific functionality using AT simulator package and can develop the RIL layer along with CHIP.