WiMAX Base Station DL-MAP Reception via Frame Segmentation
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Solution Overview
Problem
In WiMAX mobile communication systems, the reception probability of DL-MAP is low due to its narrower reachable area compared to the downlink burst region, leading to potential failures in data reception and a subsequent decrease in transmission speed when attempting to improve reception by increasing DL-MAP transmission frequency.
Innovation Solution
A base station and mobile station configuration that reallocates transmission information in unused regions within the frame structure, using a non-directional beam for DL-MAP and directional or non-directional beams for downlink bursts, to enhance DL-MAP reception probability without increasing its proportion in the frame structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission frequency of DL-MAP is increased to improve reception probability, then the reception probability of DL-MAP is improved, but the transmission speed of downlink burst is deteriorated
Solution Approach 1:
The frame structure is divided into multiple regions including MAP region and downlink burst region. The invention further segments the downlink burst region into multiple bursts, allowing DL-MAP to be transmitted selectively in certain frames while downlink bursts are transmitted in other frames or regions, thus improving DL-MAP reception without continuously sacrificing downlink burst transmission speed
Solution Approach 2:
The system employs periodic transmission of DL-MAP in specific frames rather than continuous transmission. By periodically inserting DL-MAP in frames where it can be successfully received and using other frames for downlink burst transmission, the system achieves both improved reception probability and maintained transmission speed through time-based periodic action
2Reliability
If the proportion of DL-MAP in frame structure is increased to improve reception probability, then the reception probability of DL-MAP is improved, but the transmission speed of downlink burst is deteriorated
Solution Approach 1:
The frame structure is segmented into distinct regions with specific functions. The MAP region contains control information including DL-MAP, while the downlink burst region contains data bursts. This segmentation allows DL-MAP to occupy only the necessary portion of the frame structure rather than increasing its proportion excessively, thereby maintaining downlink burst transmission speed while ensuring adequate DL-MAP reception probability
Solution Approach 2:
Instead of increasing DL-MAP proportion within a single frame dimension, the invention utilizes the time dimension by transmitting DL-MAP periodically across multiple frames. This dimensional shift allows the system to improve DL-MAP reception probability through repeated transmissions over time rather than increasing its static proportion in each frame, thus preserving downlink burst transmission capacity
Data Source
AI summary
A WiMAX compatible base station (BS) includes: an allocator unit (10B, 10C) configured to allocate allocation information of the downlink burst (DL-MAP) as transmission information in a first region (MAP region), and to allocate the downlink burst as transmission information in the second region (downlink burst region); and a transmitter unit (10F) configured to transmit the allocation information of the downlink burst with a non-directional beam, and to transmit the downlink burst with a non-directional beam or a directional beam. When detecting an unused region (A) where no transmission information is allocated after allocating the transmission information in the first region and the second region in the frame structure, the allocator unit is configured to reallocate, by use of the detected unused region, the allocation information of the downlink burst as the transmission information in the first region.