OFDMA Resource Allocation via Burst Ordering
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Solution Overview
Problem
In OFDMA-based wireless portable Internet systems, subscriber stations consume unnecessary power processing undesired bursts and face inefficiencies due to residual resources and high overheads in conventional resource allocation methods, where bursts with less robust profiles are received and processed before more robust ones, leading to delayed processing and resource wastage.
Innovation Solution
A method for allocating downlink radio resources in an OFDMA system that determines the modulation and channel coding level, allocates resources in a predefined temporal order, and transmits information in a common control block, ensuring that more robust bursts are processed first, minimizing unnecessary power consumption and residual resources by sequentially allocating resources and terminating reception when the designated burst is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDMA allows data transmission to multiple subscriber stations in the same symbol period, then system productivity and data transmission efficiency are improved, but subscriber stations must receive and process undesired bursts causing increased power consumption
Solution Approach 1:
The base station transmits burst profile information in advance through MAP (Map Information) before actual data transmission. Subscriber stations use this advance information to identify which bursts they need to receive, allowing them to skip processing unnecessary bursts and reduce power consumption while maintaining efficient multi-user data transmission
Solution Approach 2:
The system implements a feedback mechanism where subscriber stations send operational burst profile information back to the base station. This feedback allows the base station to adjust burst allocation and transmission parameters, ensuring that only necessary bursts are transmitted to each subscriber station, thereby reducing unnecessary power consumption while maintaining high productivity
2Adaptability or versatility
If conventional resource allocation methods transmit bursts with less robust profiles first, then resource allocation flexibility is improved, but processing time is delayed and residual resources increase
Solution Approach 1:
The patent inverts the conventional burst transmission order by transmitting bursts with more robust profiles first instead of less robust profiles first. This inversion allows subscriber stations to process critical data faster and reduces the time spent on residual resource processing, while the system maintains allocation flexibility through the MAP information mechanism
3Device complexity
If conventional OFDMA resource allocation is used, then system complexity is reduced, but signaling overheads and residual resources increase
Solution Approach 1:
The MAP (Map Information) structure serves multiple functions simultaneously: it provides burst profile information, indicates allocated resources, and enables subscriber stations to identify necessary bursts. This multi-functional approach reduces the need for separate signaling messages, thereby reducing overall signaling overheads while maintaining manageable system complexity
Data Source
AI summary
Disclosed is a method for allocating and accessing downlink resources in the OFDMA communication system. In the resource allocation method, bursts having the same modulation and channel encoding level are arranged in a predetermined temporal order on a physical layer. Information on the allocated unit resources is included in a common control block and is transmitted to a subscriber station, and the subscriber station then detects a number of the allocated unit resources to thus check the range of bursts to be received by the subscriber station. Therefore, power consumption by the subscriber station is reduced and signaling overheads of the common control information and unneeded residual resources are decreased.