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Over-the-Air (OTA) Virtual Memory Management System for a Mobile Device

IP.com Disclosure Number: IPCOM000131828D
Publication Date: 2005-Nov-21
Document File: 2 page(s) / 10K

Publishing Venue

The IP.com Prior Art Database

Abstract

Mobile wireless devices have very limited memory capacity. Once the memory of mobile devices becomes full, it is not possible to create new records on the device. On certain devices, the low memory manager will be activated. It is restricted to deleting old messages from the device to make room. These messages may become irretrievably lost.

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OTA VIRTUAL MEMORY

Over-the-Air (OTA) Virtual Memory Management System for a

Mobile

Device

Disclosed Anonymously

Mobile wireless devices have very limited memory capacity. Once the memory of mobile devices becomes full, it is not possible to create new records on the device. On certain devices, the low memory manager will be activated. It is restricted to deleting old messages from the device to make room. These messages may become irretrievably lost.

In certain systems, the device must retain all records that are stored on the server as a mirror image, even though some records may be accessed infrequently. There is potentially significant space on the device that is wasted.

The amount of memory on the device represents an upper bound on the amount of data that can be stored in any database and accessed on the device. The user cannot access any form of data storage that is outside of the device.

We propose a system that is similar to virtual memory management, but is implemented on a mobile wireless device. It allows for database content to be replaced with a cache that contains only a subset of records stored on the server. In this way, device memory is freed up for the most frequently used data. Also, the user can use up any amount of server space to store records, while the amount of device memory only limiting the size of the cache.

The cache resident on the device will comprise application data as records contained in a database view. All records belonging to a database are stored on the server, while the device only stores a subset of them. Data is retained in the cache based on a scheme such as most-recently-used. When a new record is created, it is flagged as dirty, and the server is automatically updated with a copy of the same record in the background through over-the-air transfer. Likewise, when the user explicitly deletes a record on the device, the deletion is propagated to the server.

When the user invokes a search on the device, the device first performs a query of the data that is stored locally. It then sends the same query parameters to the server i...