Traffic Indication Message Bitmap Structure for IEEE 802.16e MSS Power Management
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Solution Overview
Problem
The current IEEE 802.16e communication system faces inefficiencies in power management and bandwidth usage due to the size and complexity of traffic indication messages, which are necessary for directing mobile subscriber stations (MSSs) to transition between sleep and awake modes, leading to unnecessary power consumption and increased bandwidth requirements.
Innovation Solution
The proposed solution involves using a bitmap structure for traffic indication indexes instead of 16-bit Basic CIDs in the traffic indication message, allowing for a more compact message format that includes a number of MSS groups and traffic indication indexes, each representing multiple MSSs with operation instructions, thereby reducing message size and improving power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 16-bit Basic CIDs are used in traffic indication messages to identify MSSs, then each MSS can be uniquely identified, but the message size increases and bandwidth consumption increases
Solution Approach 1:
The patent segments the message structure by separating the traffic indication index (bitmap) from the detailed MSS identification. Instead of including complete 16-bit Basic CIDs for each MSS in the traffic indication message, the system uses a compact bitmap where each bit position corresponds to a specific MSS. This segmentation reduces the message size from potentially hundreds of bits to just a few bits per MSS group, while the full Basic CID can be retrieved from separate context information when needed.
Solution Approach 2:
The patent creates a simplified copy or representation of the MSS identification mechanism. Rather than transmitting the actual 16-bit Basic CID values, the system uses a bitmap copy where bit positions represent specific MSSs. This bitmap copy is much more compact and can be efficiently processed, while the original Basic CID information is maintained in the system context for when detailed identification is required.
2Speed
If traffic indication messages are transmitted frequently to control sleep mode transitions, then MSSs can respond quickly to traffic, but power consumption increases due to unnecessary wake-ups
Solution Approach 1:
The patent extracts only the essential information needed for sleep mode control from the traffic indication mechanism. Instead of transmitting complete traffic information that would require frequent message updates, the system extracts a simplified traffic indication index (bitmap) that indicates only whether traffic is pending for each MSS. This extracted information is sufficient for sleep mode decisions and can be transmitted less frequently, reducing power consumption while maintaining quick response capability.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary portion of traffic information - a compact bitmap indicating traffic presence - rather than complete traffic details. This partial information transmission is sufficient for sleep mode control purposes and allows the system to reduce messaging frequency, thereby lowering power consumption while still enabling MSSs to wake up only when necessary.
3Adaptability or versatility
If the traffic indication message includes detailed information for each MSS, then comprehensive traffic control is achieved, but the complexity of message processing increases
Solution Approach 1:
The patent changes the parameter representation from detailed Basic CID values to a compact bitmap format. Instead of using the original 16-bit CID parameter for each MSS, the system transforms this into a 1-bit indicator in the bitmap where the bit position corresponds to the MSS's Basic CID. This parameter transformation maintains the ability to identify and control traffic for each MSS individually while dramatically reducing the message size and processing complexity.
Data Source
AI summary
A method for transmitting a traffic indication message for directing a mobile subscriber station (MSS) in a sleep mode to transition to an awake mode in a Broadband Wireless Access communication system supporting the sleep mode and the awake mode. This method includes the steps of individually allocating, to MSSs belonging to a corresponding base station, corresponding areas indicating traffic instructions for the MSSs in a traffic indication field in the traffic indication message, and indicating state transition instructions in the areas allocated to the MSSs, before transmitting the traffic indication message to the MSSs.