System Information Request Bitmap Contention Resolution
Solution Overview
Problem
Current mobile device systems face delays and inefficiencies in acquiring system information due to contention resolution issues during Random Access Channel (RACH) procedures, particularly in LTE networks, where multiple RACH procedures cannot be run in parallel, leading to unnecessary retransmissions and battery waste.
Innovation Solution
The method involves using a processor to manage system information requests and responses through bitmaps in request and reply messages, allowing for simultaneous RACH procedures and optimizing contention resolution by interpreting combined acknowledgments, thereby reducing the need for retransmissions and accelerating SI acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple RACH procedures are run sequentially to request system information instances, then contention resolution is simplified, but acquisition time increases and battery consumption increases
Solution Approach 1:
The patent combines multiple RACH procedures into parallel operations by using a single random access message to request multiple system information instances simultaneously. The network device responds with a single acknowledgment containing information about multiple requested instances, eliminating the need for sequential execution and reducing overall acquisition time while maintaining reliable contention resolution through unified message handling.
Solution Approach 2:
The patent enables continuous acquisition of multiple system information instances by allowing parallel RACH procedures to proceed simultaneously rather than waiting for sequential completion. This continuity eliminates idle waiting time between procedures while the network device continuously processes and responds to multiple requests in a single acknowledgment message.
2Loss of time
If multiple RACH procedures are run in parallel to acquire system information instances, then acquisition time decreases, but contention resolution complexity increases
Solution Approach 1:
The patent segments the acknowledgment message into multiple independent response indicators, each corresponding to a specific requested system information instance. This segmentation allows the mobile device to independently process each response without complex cross-procedure contention resolution, simplifying the overall mechanism while supporting parallel acquisitions.
Solution Approach 2:
The patent creates a universal acknowledgment message structure that handles multiple system information instance requests simultaneously. The single response message serves multiple functions by providing status information for each requested instance, eliminating the need for separate contention resolution procedures and reducing device complexity.
3Quantity of substance
If sequential RACH procedures are used for system information requests, then signaling overhead is reduced, but retransmissions increase due to delays
Solution Approach 1:
The patent merges multiple separate request-response signaling exchanges into a single consolidated transaction. By requesting multiple system information instances in one random access message and receiving consolidated acknowledgment, the total signaling overhead is reduced compared to sequential procedures, while the improved efficiency comes from eliminating repeated request cycles and reducing retransmission delays.
Data Source
AI summary
For acquiring system information instances, a method determines if one or more system information instances requested in a request message are received in a reply message from a base station. The request message includes a request bitmap indicating the requested system information instances. The reply message includes a reply bitmap indicating the system information instances in the reply message. The method acquires the system information instances indicated in the request bitmap and the reply bitmap from the reply message. In addition, the method requests the system information instances from the base station that are indicated in the request bitmap and not indicated in the reply bitmap.