Uplink Bandwidth Allocation Based on Mobile Station Processing Capabilities
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Solution Overview
Problem
Current wireless broadband communication systems, particularly IEEE 802.16, face significant latency and delay issues during network entry and handover procedures due to the lack of knowledge about mobile station processing capabilities, leading to inefficient uplink bandwidth allocation and prolonged processing times.
Innovation Solution
Incorporating optional control message fields, such as TLV fields, to allow mobile stations to indicate their processing capabilities to the base station, enabling the scheduler to allocate uplink bandwidth at the exact time needed and ensuring messaging silence intervals to expedite response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station allocates uplink bandwidth conservatively assuming the mobile station needs the next frame to respond, then the system maintains reliability for all mobile stations, but the network entry and handover delay increases significantly
Solution Approach 1:
The patent changes the parameter of uplink bandwidth allocation timing from a fixed conservative assumption (next frame) to a dynamic value based on the mobile station's processing capability. The base station receives processing capability information from the mobile station and adjusts the uplink allocation timing accordingly, allowing fast mobile stations to respond within the same frame while maintaining reliability for slower stations.
Solution Approach 2:
The patent introduces a feedback mechanism where the mobile station provides information about its processing capabilities to the base station. This feedback enables the base station to make informed scheduling decisions, allocating uplink bandwidth at optimal times based on actual mobile station performance rather than conservative assumptions.
2Loss of time
If the base station uses unsolicited uplink transmission opportunities to reduce delay, then the response time improves, but the accuracy of prediction deteriorates due to lack of mobile station processing capability information
Solution Approach 1:
The mobile station provides feedback about its processing capabilities, enabling the base station to make accurate predictions about when the mobile station will be ready to transmit. This eliminates the need for conservative assumptions while maintaining prediction accuracy.
Solution Approach 2:
The mobile station provides processing capability information in advance during network entry, allowing the base station to plan uplink allocations optimally before actual data transmission begins, rather than reacting conservatively after the fact.
3Loss of information
If more downlink messages are addressed to the mobile station in a particular frame, then the information exchange improves, but the mobile station processing time is prolonged due to consumed processing power
Solution Approach 1:
The patent makes the uplink allocation dynamic based on the mobile station's actual processing load and capability. When multiple downlink messages are sent, the base station adjusts the uplink allocation timing based on the mobile station's processing capability information, ensuring the mobile station has sufficient time to process all messages before being required to respond.
Data Source
AI summary
A system and method for fast acquisition of a communication link in a wireless broadband communication system between a mobile station and a base station includes a scheduler (100) that is informed (102) of the processing capabilities of the mobile station, preferably in an optional message field. The scheduler determines (104) a time that the mobile station can respond to a downlink message, in the same frame or in a subsequent frame, using the processing capabilities. The scheduler allocates (106) uplink bandwidth for the mobile station to respond to the downlink message at the determined time. In this way, upon sending (108) a message from the base station to the mobile station, the mobile station can immediately respond (112) at the allocated time without having to perform an explicit bandwidth request. As a result, link entry and/or handover times are reduced.