Adaptive Coding for Superframe Transmission in Wireless Networks
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Solution Overview
Problem
Current wireless communication systems use a constant coding scheme for media access protocol (MAP) messages, which reduces coverage area and is not robust enough for subscriber units at the cell edge with poor channel quality, leading to ineffective frame transmission across the communication network.
Innovation Solution
The system groups subscriber units based on criteria such as distance or channel quality and assigns a unique coding scheme for each group, allowing for varying repetition rates of frames to ensure effective transmission, with frames encoded using techniques like repetition coding to accommodate different signal strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant coding scheme is used for MAP messages, then overhead is kept at an acceptable level, but coverage area is reduced and robustness for edge subscribers is poor
Solution Approach 1:
The patent applies local quality by assigning different coding schemes to different groups of subscriber units based on their channel quality. Specifically, subscriber units are divided into groups (e.g., first group with better channel quality, second group with poorer channel quality), and each group receives frames encoded with appropriately tailored coding schemes. This resolves the contradiction by making the coding scheme adaptive to local channel conditions rather than uniformly applying a constant scheme, thereby improving reliability for edge subscribers without unnecessarily increasing overall system complexity.
Solution Approach 2:
The patent implements dynamics by making the coding scheme variable rather than static. The system dynamically selects coding schemes based on subscriber unit groupings and channel conditions. Frames are encoded with different coding schemes depending on which group of subscriber units should receive them, allowing the system to adapt to varying channel qualities across different locations in the cell. This dynamic approach improves robustness for edge subscribers while maintaining acceptable overhead through selective application.
2Area of stationary object
If a constant coding scheme is used for MAP messages, then implementation is simple, but coverage area is reduced
Solution Approach 1:
The patent extends local quality to coverage area by using different coding schemes for different spatial regions. Subscriber units are grouped based on their positions and channel qualities, with those at cell edges (poorer coverage) receiving frames encoded with more robust coding schemes. This expands the effective coverage area by ensuring that even subscribers in difficult-to-reach locations can reliably receive frames, while subscribers in better locations continue to experience simple, efficient transmission.
Solution Approach 2:
The patent applies parameter changes by varying the coding scheme parameters (such as code rate, error correction level) based on the target subscriber unit group. The base station selects appropriate coding parameters for each frame according to the channel quality requirements of the intended recipient group. This allows the system to expand coverage to edge subscribers by using more robust parameter settings when needed, while maintaining simpler parameters for subscribers with good channel quality, thus avoiding unnecessary complexity throughout the entire system.
3Reliability
If varying coding schemes are used for different subscriber groups, then coverage and robustness are improved, but overhead increases
Solution Approach 1:
The patent applies segmentation by dividing subscriber units into distinct groups based on channel quality metrics. This segmentation allows the system to apply varying coding schemes only to specific groups rather than uniformly across all subscribers. The first group (better channel quality) receives frames with one coding scheme while the second group (poorer channel quality) receives frames with a different, more robust coding scheme. This targeted approach improves reliability for edge subscribers while minimizing the overall overhead increase by limiting the application of robust coding only where necessary.
Solution Approach 2:
The patent uses local quality to optimize the balance between reliability and overhead by applying enhanced coding schemes only locally to subscriber groups that need them. Instead of increasing overhead system-wide, the patent selectively applies more robust coding schemes only to frames intended for subscriber units with poorer channel quality. This localized approach ensures that edge subscribers receive the reliability improvements they need while subscribers with good channel quality continue to benefit from simpler, lower-overhead transmission.
4Productivity
If MAP message occupies significant portion of frame, then communication establishment is effective, but user data transmission space is reduced
Solution Approach 1:
The patent applies dynamics by making the frame structure adaptive rather than static. The frame is divided into multiple portions, with the MAP message occupying different portions depending on the intended subscriber group. Frames intended for the first group (better channel quality) have the MAP message in one portion, while frames for the second group (poorer channel quality) have the MAP message in a different portion with appropriate coding. This dynamic frame structure allows effective communication establishment for all subscribers while optimizing the remaining space for user data transmission based on the specific frame's purpose.
Data Source
AI summary
A method and apparatus includes a scheduling entity (308) for scheduling and transmitting the superframe (402) across a communication network (200). The controller (310) coupled with scheduling entity (308) groups the subscriber unit (304) into one of the plurality of groups. The scheduler entity (308) assigns a coding scheme for each group and encodes each frame of the superframe (402) based upon the assigned coding scheme for the group, to which the frame is to be transmitted. The transceiver (316) coupled with controller (310) via hardware interface (314) receives the encoded superframe and transmits the superframe to the plurality of subscriber units in the communication network (200).