Early Frame Termination via CRC for Power Conservation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, such as IEEE 802.11, lack effective power-saving mechanisms, particularly in sensor networks, where stations need to conserve battery power by reducing unnecessary data frame reception.
Innovation Solution
Incorporating an additional cyclic redundancy check (CRC) in IEEE 802.11 beacon and data frames, allowing receiving stations to terminate frame reception early after detecting the CRC, which helps determine if the frame is intended for another station or BSS, thereby conserving power and entering a low power operational mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stations receive complete beacon frames to ensure reliable information acquisition, then information completeness is improved, but power consumption increases
Solution Approach 1:
The beacon frame is segmented into critical information portions (BSSID, TIM, timestamp) that can be independently extracted and processed. Stations only need to receive and process these segmented critical portions rather than the complete frame, enabling early termination of frame reception while maintaining essential information completeness.
Solution Approach 2:
Critical information elements (BSSID, TIM, timestamp) are extracted and placed at the beginning of the beacon frame structure. This extraction allows stations to obtain necessary information without receiving the entire frame, as these extracted elements contain the essential data needed for station operation and power management decisions.
2Reliability
If stations receive complete data frames to ensure accurate data reception, then data accuracy is improved, but power consumption increases
Solution Approach 1:
An additional CRC field is inserted at a predetermined location within the data frame structure, before the complete frame is fully transmitted. This preliminary error checking mechanism allows stations to verify frame integrity early in the reception process and terminate reception immediately upon detecting an error, preventing waste of power on receiving complete erroneous frames.
Solution Approach 2:
Stations are enabled to skip the remainder of frame reception when the additional CRC indicates an error or when the station identifier does not match. This skipping mechanism allows rapid termination of unnecessary reception operations, significantly reducing power consumption while maintaining data accuracy for valid frames.
3Reliability
If stations monitor all beacon frames to maintain network synchronization, then synchronization reliability is improved, but power consumption increases
Solution Approach 1:
The BSSID and timestamp information are extracted and positioned at the beginning of the beacon frame. Stations only need to extract and process these specific elements to maintain synchronization and identify their associated network, allowing them to ignore the remainder of the beacon frame content and enter power save mode sooner.
4Loss of information
If frames contain complete information to ensure comprehensive data availability, then information completeness is improved, but frame transmission time increases
Solution Approach 1:
The beacon and data frames are segmented with critical information and error checking elements positioned at the beginning. This segmentation allows receiving stations to process only the essential portions of frames quickly, reducing the effective processing time while maintaining information completeness for stations that need the full frame content.
Data Source
AI summary
An additional cyclic redundancy check (CRC) is inserted in IEEE 802.11 beacon or data frames prior to the end of the frame, at a location following information sufficient for the receiving station to determine whether the frame is from an overlapping basic service set or intended for a different station and to extract other necessary or useful information such as a time of the next full beacon. Upon detecting the CRC, the receiving STA can terminate reception of the frame early to conserve power, and then enter a low power operational mode to further conserve power.