Patent Application
20090100417
The present invention relates to a processor controlled device, in particular to an electronic communication and/or multimedia device which comprises a central processing unit controlling the operation of the device wherein said device is operable in a plurality of different operation modes. Furthermore, the present invention relates to a method for operating an electronic communication and/or multimedia device. Said method might in particular be used for distributing and updating information or data contained in memory means of the device.
With the rapid and continuous advancement of software and hardware technology, maintenance of existing devices and software components presents an ever-increasing challenge. Routine installation of information updates and patches has become a recognised necessity to ensure that the devices are kept fully functional over the operational life times. Unfortunately, for many devices and applications update management is extremely time-consuming and often requires a temporary deactivation of the device.
If—for example—the device is a mobile phone, there are often scenarios in which the normal functionality of the phone is discontinued due to maintenance operations or some other kind of operation that is not possible to combine with the standard mode of the mobile phone operation. An example is the so-called firmware update over the air (FOTA) which is offered by cellular network operators in order to update the functionality of the phone. During the code update phase of an FOTA service, more or less the entire code stored in memory means of the phone is being updated in order to upgrade it to a newer software version. During this phase, the user has to wait until this update operation is completed before a normal use of the phone is again possible. In the case of an FOTA, depending on the kind of flash memory that is being used in the phone, the mobile phone is discontinued from said standard operation for a relative long time.
A possible solution in order to avoid this problem is the usage of code shadowing. In this case, the entire code is being copied from a flash memory of the phone to a RAM at the start-up of the phone. A normal operation of the phone is maintained by allowing a code execution from the RAM while a new software version is being prepared in the flash memory. However, in this case the problem might arise that the file system is as well an object for the upgrade through FOTA and must therefore be synchronised afterwards. The main problem, however, is that code shadowing is expensive since it requires as much RAM as the whole size of the code.
A more cost-efficient way to execute code from a RAM is the use of demand paging. This method reduces the RAM needed for code execution by 30-50% compared with code shadowing. However, in this case only a part of the code is loaded into RAM. In case a new function is started, a new page might be requested to be loaded from the flash memory while the flash memory is actually in a state of total reorganisation by FOTA.
The problem mentioned above arises not only with the usage of mobile phones. Generally, portable electronic devices often lack the ability to perform automated update operations in a convenient and reliable manner. Since, however, increased sophistication of updatable electronic devices and software often necessitates frequent maintenance where updates are made available and desirably applied on a weekly or monthly basis, there is a need for an improved update process that allows a reliable update of hardware and/or software systems without completely constricting the operation of the system.
The solution to this problem is based on the idea of providing an electronic device which is operable in a so-called reduced mode in which a part of the data or code defining the operation of the device is copied into a specific memory wherein the operation of the device in said reduced mode is generally only carried out on the basis of these copied data. In contrast to the known method of demand paging, the data that are necessary in order to run the reduced mode are completely identified at the initiation of the reduced mode and copied to the specific memory means. Thus, during the execution of the reduced mode it is not any longer necessary to access data that might be updated at the same time. The conflict situation mentioned above in relation with demand paging is therefore avoided.
Thus, in accordance with the present invention, a processor controlled device, in particular an electronic communication and/or multimedia device comprising a central processing unit controlling the operation of said device is provided wherein the normal operation of the device is carried out on the basis of data stored in first and/or second memory means of said device and wherein in a reduced mode of said device, a part of the data stored in said first memory means is copied into second memory means, said data being copied to the second memory means being identified at the initiation of said reduced mode, and wherein further the operation of said device in said reduced mode is basically carried out only on the basis of the data contained in said second memory means. Furthermore, a method of operating a processor controlled device, in particular an electronic communication and/or multimedia device is provided wherein the normal operation of the device is carried out on the basis of data stored in first and/or second memory means of said device and wherein the method further comprises the step of operating the device in a reduced mode in which at first a part of the data stored in said first memory means and being necessary for running the reduced mode is identified and copied into said second memory means of said device and the operation of said device in said reduced mode is basically carried out only on the basis of the data contained in said second memory means.
The solution in accordance with the present invention provides the possibility of updating the data or software contained in the first memory means while a basic functionality of the device is still maintained. Thus, in contrast to present solutions used for updating the software—for example—of a mobile phone, the phone can still be used during FOTA or another service having influence on the content of the data.
The present invention however is not reduced to the scenario of updating the software contained in the first memory means. The reduced mode for operating the device might also be selected in other situations. In particular, this inventive feature might also be useful in case that the power consumption of the device has to be temporarily reduced. For example, in case the battery level is low and the user of the device still wants to keep the device working but with a limited set of functionality, a specific power reduction reduced mode might be selected which still provides the basic functionality of the device but reduces the power consumption by not providing other functionality.
Thus, in accordance with a preferred embodiment of the present invention, a plurality of reduced modes is selectable wherein the data copied from said first memory means to said second memory means depend on the reduced mode that has been selected. In particular, the functionality of said device might be reduced to a specific function depending on the reduced mode selected.
While executing the device in the reduced mode, an access to the first memory means is preferably restricted. Thus, the central processing unit only uses the data contained in the second memory means. However, an access to specific parts of the first memory means might still be allowed. In this case, the first memory means preferably comprises an area containing user content data—e.g., MP3-files or the like—that might also be accessed by the CPU. At the same time, the data of said first memory means might be accessed by an update service in order to update the software and/or functionality of the device. When the reduced mode is again left, the normal execution mode might be initiated by synchronising the data contained in the second memory means with the data of the first memory means in case the data have been amended.
Preferably, the first memory means is a flash memory, a USB memory device, a hard drive or a comparable memory means while the second memory means is a random access memory (RAM).
Accordingly, the present invention provides a possibility of allowing the user of a device to use still a limited set of functions while the data contained in the memory of the device can be updated. Thus, it is possible to make a phone call or listen to music in a mobile phone while the remaining software is being upgraded via FOTA or another service. In contrast to today's solutions wherein no functionality at all is available during the software update, the present invention provides a significant improvement.
The above-mentioned aspects as well as other aspects, advantages and novel features of the present invention will become apparent upon reading the following detailed description with reference to the accompanying drawings.
In the following, the present invention is explained with reference to a mobile phone which represents a preferred embodiment of the present invention. Nevertheless, it has to be emphasised that the concept of the present invention is not reduced to mobile phones but might also be used with other devices that are controlled by a processor, e.g., other communication and/or multimedia devices. Generally, the inventive concept of providing a reduced mode might always be useful in case the software of the device has to be updated from time to time or the power consumption has to be temporarily reduced.
The mobile phone 1 shown in
The different applications of the mobile phone 1 are controlled by a central processing unit 30 shown in
As shown in
The first memory means 10 is also called external memory and might be represented by a flash memory, a USB memory device, a hard drive or another comparable memory device.
Additionally, the mobile phone comprises a second memory 20 which is preferably represented by a random access memory (RAM). Said random access memory 20 might be used in order to copy data from the first memory means 10 that are repeatedly used by the central processing unit 30. The RAM 20 allows a faster access to the stored data and therefore helps to improve the performance of the whole mobile phone 1.
Thus, during a standard operation of the mobile phone 1, the central processing unit 30 mainly accesses the RAM 20 in order to execute the code stored therein. Nevertheless, also the data stored in the first memory means 10 are accessed by the central processing unit 30 in order to run the mobile phone. Accordingly, the operation of the mobile phone 1 in the standard mode carried out on the basis of all data stored in the first memory means 10.
From time to time, the data stored in the first memory means 10 must be updated in order to upgrade the functionality of the mobile phone 1. By updating the data contained in said first memory means 10, the functionality of the mobile phone 1 might be improved or new applications might be made available for a user of the phone 1. This update might in particular take place in the form of a firmware update over the air (FOTA) wherein the data contained in the code section 11 of the main memory 10 are replaced by new data that are wirelessly transmitted. In this way, the software controlling the function of the mobile phone 1 is renewed.
Up to now, the mobile phone 1 had to be discontinued from the standard operation during such a software update. However, depending on the kind of memory used for the first memory means 10, the user had to wait for a relatively long time until the mobile phone 1 was again useable.
In order to avoid this problem, a specific method of operating the mobile phone 1 is introduced in accordance with the present invention which will be explained in the following.
The present invention is based on the idea of providing a reduced operation mode wherein a subset of the first memory means 10 is copied into the second memory means 20 and an access to the first memory means 10 is restricted. During the reduced mode, the operation of the mobile phone 1 is basically carried out on the basis of the data stored in the second memory means 20. Since the storage space of the second memory means 20 is considerably smaller than the storage space of the first memory means 10, the functionality of the mobile phone 1 must most likely be restricted. Nevertheless, at least a few functions are still available to the user of the phone 1 during this inventive reduced mode.
According to a preferred embodiment of the present invention, a plurality of different reduced modes is available. As shown in
As mentioned above, a specific feature of the reduced mode is that the operation of the mobile phone 1 is carried out basically on the basis of data stored in the second memory means, i.e. in the RAM 20. Thus, depending on the reduced mode selected, specific data have to be transferred from the first memory means 10 into the RAM 20. The rules for the selection of the data can be implemented during the development of the mobile phone 1 and can be obtained either by analysis or by experimentation. This information is stored in the look-up table mentioned above and allows the system to identify the data that have to be copied to the second memory means.
It is a specific feature of the present invention that the data that are necessary for running a reduced mode are identified at the initiation of the reduced mode. In contrast to the known method of demand paging, an access to additional data afterwards in order to continue the operation of the device is not necessary.
After the data have been copied into the RAM 20, the access to the first memory means is restricted. Now, the mobile phone 1 is in the reduced mode wherein the central processing unit 30 controls the operation of the phone 1 only on the basis of the data stored in the RAM 20. As mentioned above, a limited functionality of the phone 1 might be available depending on the reduced mode selected. For example, the phone might be in an idle mode, might be used as a music player or for playing games. This reduced mode, however, is not necessarily a subset of the normal functionality of the phone. It would also be possible to use specifically designed software for this reduced mode.
While the phone 1 is operated in the reduced mode, an access to the blocked memory 10 is usually forbidden as mentioned above. Under specific circumstances, however, it might be possible to leave the reduced mode in order to fetch more data from the first memory means 10 and to return to the reduced mode afterwards. For example, the CPU 30 might access data contained in the user content part 122 of the data section 12 in order to play a specific music file. Further, in case the software of the device is not being updated during the reduced mode, an additional fetching of data (also from the code section 11) might also be allowed. Nevertheless, this temporary quitting of the reduced mode in order to read or write data might also be completely forbidden. In particular, the CPU 30 will not be allowed to access data contained in the system part 121. In case it is not possible to leave the reduced mode, the user of the phone 1 is notified in case he initiates an action that would require the access to data stored in the first memory means 10. In this case, on the display 2 of the phone information would be shown informing the user of the restrictions of the current execution mode.
However, during this reduced mode, the data stored in the first memory might be accessed and updated via FOTA or another service. Thus, the user is still able to use the applications provided by the selected reduced mode while the firmware of the phone is updated. In contrast to solutions known in the prior art, it is therefore still possible to use the phone 1.
Finally, when the reduced mode is left by the user in order to enter the normal operation mode of the phone 1, the data stored in the first memory 10 means must probably be synchronised with the data of the RAM 20, e.g., call lists or the file systems must be updated. In case the software of the phone 1 has been updated during the reduced mode, the phone 1 may—if required—afterwards be re-booted in order to execute the new software.
The different steps of the present invention of operating a device in a reduced mode are shown in
After the reduced mode has been selected, a page list is defined for the selected mode in step S102. As shown in
Referring again to
The reduced mode is now executed in the following step S105. In this mode, the central processing unit 30 controls the operation of the mobile phone 1 only on the basis only of data stored in the second memory means 20. During this reduced mode, it is, however, still possible to amend the data in the first memory means 10. In this way, during the execution of the reduced mode, these data might be updated by FOTA or another service. Further, as already mentioned above, it might be possible to temporarily leave the reduced mode in order to fetch more data from the first memory means 10. However, usually the CPU 30 only accesses the data contained in the RAM 20.
After the reduced mode is left, a synchronisation of the data stored in the first memory means 10 might be necessary. In this case, the data contained in the RAM 20 are again transferred into the corresponding data blocks of the first memory means 10. In this way, call lists or file systems may be updated that have been amended during the execution of the reduced mode.
After the synchronisation in step S106, the mobile phone is again operated in the normal mode in step S107. Depending on the reason for entering the reduced execution mode, it might be necessary to re-boot the mobile phone 1. This might in particular be necessary in case the remaining data have been updated in order to carry out an update of the firmware.
As already mentioned above, the present invention is not restricted to the use of mobile phones. Instead, in all cases the software of an electronic device has to be updated, the present invention might be useful in order to provide a reduced functionality during the update process. The present solution opens a new possibility to allow a user to still use a limited set of functionality while the software is being upgraded via an FOTA or another service. Additionally, the present invention might also be useful in case there is a need for a temporary reduction of the power consumption, e.g. when the battery level is low and the user would like to keep the device working but with a limited set of functionality.
| Number | Date | Country | Kind |
|---|---|---|---|
| 05012536.8 | Jun 2005 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2006/005197 | 5/31/2006 | WO | 00 | 5/15/2008 |
| Number | Date | Country | |
|---|---|---|---|
| 60690975 | Jun 2005 | US |
