Adaptive bandwidth consumption optimization for wireless data connections
Embodiments are disclosed for caching multimedia content. An example in-vehicle computing system that adaptively caches multimedia data, the in-vehicle system including a memory, a position sensor, a receiver, and a processor. The position sensor provides a position signal indicative of a present location of the system. The receiver wirelessly receives multimedia data from a remote multimedia data source. The processor stores the received multimedia data in the memory, transfers multimedia data in the memory to a queue for playback when an amount of multimedia data saved in the memory is at least a first threshold value, and adjusts a size of the memory when a wireless communication channel is not available between the system and a remote multimedia data source.
1. An in-vehicle computing system that adaptively caches multimedia data, the in-vehicle system comprising:
a memory;
a position sensor that provides a position signal indicative of a present location of the system;
a receiver that wirelessly receives multimedia data from a remote multimedia data source; and
a processor that stores the received multimedia data in the memory, transfers multimedia data in the memory to a queue for playback when an amount of multimedia data saved in the memory is at least a first threshold value and adjusts a size of the memory when a wireless communication channel is not available between the system and the remote multimedia data source;
increases the size of the memory by a first amount when the wireless communication channel is not available;
maintains the memory at the increased size when the wireless communication channel is subsequently available and if the amount of stored multimedia data is less than a second threshold value, the second threshold value being greater than or equal to the first threshold value; and
decreases the size of the memory by a second amount when the amount of stored multimedia data is at the second threshold value.
2. The system of claim 1 , wherein the first threshold value is based on the adjusted size of the memory; and wherein the processor increases the size of the memory by a first amount responsive to detecting each of a plurality of adjacent sample times that wireless communication is not available between the system and the remote multimedia data source.
3. The system of claim 2 , wherein the processor decreases the size of the memory by a second amount when a wireless communication channel is available between the system and the remote multimedia data source.
4. The system of claim 1 , wherein the memory is a cache memory; and wherein the cache memory comprises a circular buffer with a head index that indicates where the received multimedia data is to be stored and a tail index that indicates where transfer of the stored multimedia data in the cache memory to the queue for playback is to start.
5. The system of claim 1 , where the memory, the position sensor, the receiver and the processor are each located in a smart phone within a vehicle.
6. The system of claim 1 , where the memory, the position sensor, the receiver and the processor are each located in a motor vehicle head unit.
7. The system of claim 1 , where the memory, the position sensor, the receiver and the processor are distributed between a motor vehicle head unit and a smart phone.
8. The system of claim 1 , wherein the processor monitors the receiver to determine when the system is not in communication with a wireless communication channel and to provide white spot position information indicative of the present location when the system is not in communication with a wireless communication channel.
9. The system of claim 1 , further comprising a transmitter that wirelessly transmits the present location and where the processor increases the size of the memory by a first amount a second time when a wireless communication channel is still not available between the system and the remote multimedia data source.
10. The system of claim 9 , where the memory, the position sensor, the receiver and the processor are each located in a smart phone, and a transmitter also within the smart phone wirelessly transmits the system location.
11. A method for adaptively caching multimedia data, the method comprising:
wirelessly receiving multimedia data from a remote multimedia data source via a communication network;
storing the received multimedia data in a memory of a data storage device included in an in-vehicle computing system of a vehicle;
transferring the stored multimedia data in the memory to a queue for playback when an amount of the stored multimedia data is at least a first threshold value, the first threshold value based on a size of the memory, increasing the size of the memory by a first amount when a wireless communication channel is not available;
maintaining the memory at the increased size when the wireless communication channel is subsequently available and if the amount of stored multimedia data is less than a second threshold value, the second threshold value being greater than or equal to the first threshold value; and
decreasing the size of the memory by a second amount when the amount of stored multimedia data is at the second threshold value.
12. The method of claim 11 , further comprising determining a present location of the vehicle and providing a position signal indicative thereof.
13. The method of claim 11 , further comprising adjusting the size of the memory in response to expecting a change in one or more parameters of the communication network occurring within a threshold duration, the one or more parameters including a bandwidth of the communication network and a cost of the communication network; wherein the size of the memory is based on a weight assigned to each of the one or more parameters; and wherein the memory is a cache memory.