Multi-MCS BR-ACK MAP-IE Segmentation for IEEE 802.16m
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Solution Overview
Problem
The inefficiency in broadcasting aggregated multi unicast information to multiple users with different Modulation and Coding Scheme (MCS) capabilities in IEEE 802.16m networks, leading to significant overhead and wasteful processes due to the need to send messages at the lowest common MCS, which limits the performance of Advanced Base Stations (ABS) in acknowledging and granting bandwidth requests.
Innovation Solution
The method involves transmitting multiple copies of Bandwidth Request Acknowledgement MAP Information Element (BR-ACK MAP-IE) messages, each tailored to the specific MCS capabilities of different Advanced Mobile Stations (AMSs), allowing for efficient broadcasting of aggregated multi unicast information by using more than one Modulation and Coding Scheme, thereby reducing overhead and enhancing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single broadcast message is used to transmit aggregated multi unicast information to multiple users, then the message can be received by all users, but the message must be sent at the lowest MCS that all users can decode, resulting in transmission inefficiency and increased overhead
Solution Approach 1:
The patent divides the single broadcast message into multiple segmented messages, each tailored to specific MCS capabilities. Instead of sending one aggregated message that must accommodate the lowest MCS user, the system segments users into groups based on their MCS capabilities and sends separate broadcast messages to each group. This allows each message to be optimized for its target group's decoding capabilities, resolving the contradiction between universal delivery (reliability) and transmission efficiency.
2Reliability
If aggregated multi unicast information is sent in a single broadcast message, then all users can receive the information, but the aggregate size of the message increases significantly, leading to increased A-MAP controlling overhead
Solution Approach 1:
The patent segments the large aggregated message into multiple smaller messages grouped by MCS capability. Instead of one comprehensive A-MAP IE containing all user information, the system creates multiple smaller A-MAP IEs, each containing information for a specific group of users with similar MCS capabilities. This segmentation reduces the size of individual messages and decreases the controlling overhead required to manage them.
3Adaptability or versatility
If the broadcast message is sent at the lowest common MCS to ensure all users can decode it, then all users can receive the information, but the performance of Advanced Base Stations is limited and overhead increases
Solution Approach 1:
The patent applies local quality by tailoring each broadcast message to the specific MCS capabilities of its target user group. Instead of using a uniform low MCS for all users, the system assigns different MCS levels to different message segments based on the decoding capabilities of specific user groups. This allows the base station to operate at higher, more efficient MCS levels for users who can support them, thereby improving overall base station performance while maintaining compatibility across all user types.
Data Source
AI summary
A method and apparatus are provided for transmitting a communication frame by a base station which comprises broadcasted information intended for a plurality of subscriber stations (AMSs), wherein that information is broadcasted by using more than one Modulation and Coding Scheme (MCS). The method comprises the steps of: a) receiving bandwidth requests' indications from the plurality of AMSs; b) based on these indications, identifying more than one decoding capabilities, wherein each of the identified decoding capabilities is associated with at least one of the plurality of AMSs; c) preparing a Bandwidth Request Acknowledgement Media Access Protocol Information Element (BR-ACK MAP-IE) message in response to the bandwidth requests' indications received; and d) transmitting a communication frame which comprises at least two copies of the BR-ACK MAP-IE message, wherein the number of the copies corresponds to the number of different decoding capabilities identified, and wherein each of the copies is transmitted at an MCS that corresponds to a respective decoding capability that has been identified.