Wireless Traffic Indication via Grouped Sleep Mode Bitmaps
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Solution Overview
Problem
In wireless communication systems, the existing standards fail to properly provide traffic indication messages to mobile stations in sleep mode, leading to inefficiencies in power management and data handling.
Innovation Solution
A method where a base station groups sleep mode IDs and broadcasts a traffic indication message using first and second bitmap information to indicate traffic existence, allowing mobile stations to determine their own traffic status within these groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station broadcasts traffic indication messages to all mobile stations in sleep mode, then all mobile stations can be informed of their traffic status, but the message size and transmission complexity increase significantly
Solution Approach 1:
The patent divides mobile stations into multiple groups based on their sleep mode IDs, where each group is assigned a specific group ID. The traffic indication message is segmented to include only the group ID and bitmap information relevant to that group, rather than including information for all mobile stations. This segmentation reduces the message size and processing complexity while maintaining accurate traffic indication for each mobile station group.
2Reliability
If the base station buffers traffic data for mobile stations in sleep mode until their listening interval, then data can be delivered accurately, but the base station requires larger buffer memory and longer data retention time
Solution Approach 1:
The base station performs preliminary actions by determining which mobile station groups have pending traffic data before the mobile stations reach their listening intervals. The system prepares group-specific traffic indication messages with bitmap information indicating which mobile stations within each group have data awaiting transmission. This preliminary preparation allows for efficient data delivery when mobile stations wake up, reducing the need for large buffer memory by enabling targeted data transmission.
3Speed
If mobile stations wake up frequently to check for traffic messages, then they can respond to incoming data quickly, but their power consumption increases
Solution Approach 1:
The patent implements periodic action by having mobile stations wake up at predetermined listening intervals to check for group-specific traffic indication messages. During these periodic wake-up periods, mobile stations receive traffic indications for their assigned groups and can determine whether they have incoming data. This periodic checking mechanism balances power consumption by keeping mobile stations in low-power sleep mode between intervals while still enabling timely response to traffic conditions when needed.
Data Source
AI summary
Disclosed are methods for transmitting/receiving a traffic indication message in a wireless communication system. In the wireless communication system, a base station (BS) groups a plurality of sleep mode IDs, and broadcasts a traffic indication message that includes first bitmap information indicating whether traffic corresponding to respective the sleep mode ID groups exists as well as second bitmap information indicating whether traffic indicators with respect to the respective sleep mode IDs that belong to the sleep mode ID groups exists. A mobile subscriber station (MS) which is allocated with any one of the plurality of sleep mode IDs, determines whether the traffic occurs in the sleep mode ID group to which the MS itself belongs using the first bitmap information if the MS receives the traffic indication message, and checks the traffic indicator of the terminal itself using the second bitmap information if the traffic occurs in the sleep mode ID group to which the MS belongs.