PRAW Indicator Scheduling for Wireless Resource Allocation
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Solution Overview
Problem
Current IEEE 802.11 TGah systems face challenges in efficiently indicating periodic resource allocations, leading to ambiguity and inconsistency in PRAW indications, particularly for stations that may miss PRAW information due to its broadcast only at specific beacon frames, and lack clarity on updating or modifying scheduled PRAWs.
Innovation Solution
The system schedules resources for a periodic restricted access window (PRAW), generates a PRAW indicator with information about the scheduled resources, and determines a next PRAW indication time prior to the last occurrence, transmitting this information in a frame to ensure stations are informed efficiently and consistently, with all allocated PRAW information included in one message to reduce ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If PRAW information is broadcast only at specific beacon frames, then signaling overhead is reduced, but stations may miss PRAW information leading to ambiguity and inconsistency
Solution Approach 1:
The patent applies preliminary action by including a 'next PRAW indication time' field in the PRAW indicator, which tells stations in advance when the next indication will occur. This allows stations to proactively prepare and ensure they don't miss critical PRAW information, resolving the reliability issue while maintaining reduced signaling overhead through targeted broadcasts.
Solution Approach 2:
The patent implements feedback by providing stations with explicit timing information about when next PRAW indications will occur. This feedback mechanism allows stations to adjust their listening behavior and ensure they receive PRAW information, thereby improving reliability without requiring continuous broadcasting that would increase signaling overhead.
2Reliability
If PRAW information is broadcast at every beacon frame, then stations always have up-to-date PRAW information, but signaling overhead increases
Solution Approach 1:
By including the next PRAW indication time in advance, the system enables stations to know exactly when to expect updates. This allows the AP to broadcast PRAW information less frequently while ensuring stations remain synchronized, thereby maintaining reliability without increasing signaling overhead.
Solution Approach 2:
The patent establishes a periodic indication mechanism where PRAW information is broadcast at predetermined intervals rather than continuously. The next PRAW indication time field enables this periodic action by allowing the AP to schedule broadcasts efficiently, reducing signaling overhead while maintaining consistent information delivery to stations.
3Adaptability or versatility
If multiple PRAW indications are sent separately, then each indication can be targeted, but signaling overhead and complexity increase
Solution Approach 1:
The patent merges multiple PRAW indication elements into a single unified PRAW indicator structure that includes resource allocation information, timing details, and next indication time. This consolidation maintains the flexibility to target different stations with specific PRAW allocations while reducing overall system complexity and signaling overhead compared to separate indications.
4Reliability
If PRAW information is updated frequently, then stations have current allocation information, but processing overhead increases
Solution Approach 1:
The patent implements periodic updates with the next PRAW indication time field, allowing the system to maintain accurate resource allocation information while reducing processing frequency. Stations can efficiently process updates at predetermined intervals rather than continuously, thereby maintaining allocation accuracy while minimizing processing overhead and energy consumption.
Data Source
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AI summary
A method for operating an access point (AP) includes scheduling, by the AP, first resources for a first periodic restricted access window (PRAW) (block 1205), and generating, by the AP, a first PRAW indicator including first information associated with the scheduled first resources for the first PRAW (block 1210). The method also includes determining, by the AP, a next PRAW indication time in accordance with the first PRAW (block 1210), and transmitting, by the AP, the first PRAW indicator and the next PRAW indication time in a first frame (block 1215).