Single RF Device CBS Reception Coordination for Dual-SIM Phones
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Solution Overview
Problem
Dual-card cellular phones with a single Radio Frequency (RF) device often experience collisions during the reception of Cell Broadcast Service (CBS) messages or schedule messages, leading to incomplete message reception due to round-robin scheduling, where only one subscriber number can receive the messages at a time.
Innovation Solution
Prioritizing one subscriber number for receiving all blocks of a CBS or schedule message, allowing it to reassemble the message, and sharing schedule information between subscriber numbers to ensure complete message reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single RF device is shared by two subscriber numbers for transmission/reception operations, then cost is reduced, but reception operations for CBS messages may collide and complete message reception cannot be guaranteed
Solution Approach 1:
The patent implements dynamic scheduling of RF device allocation between two subscriber numbers based on CBS message reception needs. The system dynamically adjusts which subscriber number receives CBS messages at different time slots, ensuring complete message reception while sharing a single RF device. This dynamic resource allocation resolves the contradiction by making the system adaptable rather than static.
Solution Approach 2:
The patent uses preliminary action by having the network side pre-configure different time slots for CBS message transmission to different subscriber numbers. The schedule messages are prepared in advance, allowing the single RF device to switch between subscriber numbers without collision, ensuring complete message reception while maintaining cost efficiency.
2Adaptability or versatility
If round-robin scheduling policy is used to allocate RF device between two subscriber numbers, then both subscriber numbers can share the RF device, but neither subscriber number can receive complete CBS messages when transmissions occur in multiple time slots
Solution Approach 1:
The patent segments the CBS message reception process by assigning different time slots to different subscriber numbers. Instead of attempting to receive all message blocks simultaneously, the system divides the reception task across multiple time slots and subscriber numbers, with each subscriber number receiving specific segments of the overall message set. This segmentation eliminates collision while ensuring complete message coverage.
Solution Approach 2:
The patent changes the scheduling parameter from round-robin time-based allocation to message-block-based allocation. Instead of switching RF device allocation every fixed time interval regardless of message reception status, the system allocates based on which specific message blocks need to be received by which subscriber number, ensuring complete reception without collision.
3Adaptability or versatility
If a dual-card cellular phone supports at least two RATs with individual subscriber numbers, then flexibility of mobile communications is improved, but the single RF device cannot handle simultaneous reception operations for both subscriber numbers
Solution Approach 1:
The patent implements periodic action by scheduling CBS message reception operations at different time periods for different subscriber numbers. The single RF device alternates between serving different subscriber numbers in a periodic manner, with each subscriber number receiving CBS messages during its designated time periods. This periodic scheduling maintains the flexibility of dual-card operation while avoiding simultaneous reception conflicts.
Data Source
AI summary
A mobile communication device including a single Radio Frequency (RF) device is provided for coordinating operations of receiving cell broadcast messages using different subscriber numbers camped on the same cell. The mobile communication device is characterized in that one subscriber number is prioritized at a time for receiving all the blocks of a CBS message or a schedule message, allowing at least one subscriber number to receive a complete CBS message or a complete schedule message. In addition, the mobile communication device is characterized in that the schedule information received for one subscriber number is shared between the operations associated with other subscriber numbers, allowing the CBS messages for all subscriber numbers to be received.