Uplink Bandwidth Request Signaling for Delay-Sensitive Services
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Solution Overview
Problem
Conventional OFDMA systems face challenges in supporting delay-sensitive real-time services due to high latency in the five-step bandwidth request (BW REQ) signaling procedure, which is inefficient and difficult to manage resource allocation effectively.
Innovation Solution
The proposed solution reduces the BW REQ signaling procedure from five steps to three steps by optimizing the transmission and reception methods, allowing for faster resource allocation and incorporating a combined three-step and five-step procedure to differentiate between delay-sensitive and non-delay-sensitive services, along with advanced error detection and orthogonal sequence index selection to minimize contention and decoding errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the conventional five-step BW REQ signaling procedure is used, then resource allocation can be managed with a standardized procedure, but latency is high and delay-sensitive services cannot be supported effectively
Solution Approach 1:
The patent segments the BW REQ signaling procedure into two distinct paths: a three-step procedure for delay-sensitive services and a five-step procedure for non-delay-sensitive services. This segmentation allows the system to optimize latency for real-time applications while maintaining robust resource management for other services, directly resolving the contradiction between reducing latency and managing complexity.
Solution Approach 2:
The patent introduces dynamic service classification that determines which signaling procedure (three-step or five-step) to use based on the service type. The system dynamically selects the appropriate procedure based on whether the service is delay-sensitive or not, enabling adaptive optimization of latency while maintaining manageable complexity through context-aware procedure selection.
2Productivity
If the five-step BW REQ signaling procedure is used, then comprehensive resource allocation can be achieved, but the number of signaling steps increases latency
Solution Approach 1:
The patent segments resource allocation procedures into fast-path (three-step) and standard-path (five-step) methods. The fast-path is optimized for scenarios where quick resource allocation is critical, while the standard-path provides comprehensive resource management. This segmentation enables the system to achieve high productivity for time-sensitive operations without sacrificing comprehensive resource allocation capabilities.
Solution Approach 2:
The patent changes the procedural parameters (number of steps, information exchange sequence) based on service requirements. For delay-sensitive services, the system uses a three-step procedure with modified parameters that reduce signaling time while maintaining essential resource allocation functions. This parameter adaptation resolves the contradiction between allocation efficiency and signaling time.
3Ease of operation
If bandwidth is pre-defined for BW REQ messages, then resource allocation can be simplified, but flexibility to accommodate varying bandwidth requirements is reduced
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the BW REQ message format and resource grant size are adapted based on service type and traffic requirements. The system dynamically adjusts allocation parameters rather than using fixed pre-defined values, maintaining ease of operation through automated adaptation while achieving high flexibility to accommodate varying bandwidth needs of different services.
Data Source
AI summary
Methods and apparatus are provided for requesting uplink Bandwidth (BW) over a BW Request (REQ) channel in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system. A BW REQ indicator is transmitted with a BW REQ message over the BW REQ channel from a Mobile Station (MS) to a Base Station (BS) to request an uplink resource for uplink traffic of a delay sensitive service. A grant of the requested uplink resource is received from the BS in accordance with the transmitted BW REQ indicator and the BW REQ message. The uplink traffic is transmitted from the MS to the BS using the granted uplink resource.