Relative Grant Frequency Resource Allocation in FDMA Systems
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Solution Overview
Problem
Current FDMA systems face challenges in efficiently allocating and identifying frequency resources, leading to increased signaling overhead, particularly in scenarios where frequency resources need to be dynamically adjusted, such as in Long Term Evolution (LTE) systems with short Transmit Time Intervals (TTI).
Innovation Solution
The implementation of a method and apparatus that utilize Relative Grant (RG) messages to convey relative information about frequency resource changes based on currently used channels, reducing the need for explicit terminal ID, Channel ID, and Modulation and Coding Scheme (MCS) information, thereby minimizing signaling overhead. This includes using Absolute Grant (AG) and RG messages to manage frequency resource allocation, where RG messages provide direction and amount information for increasing or decreasing frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit terminal ID, Channel ID, and MCS information are used for frequency resource allocation, then allocation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent uses Relative Grant (RG) messages that copy reference information from previously allocated resources rather than transmitting complete allocation information. The RG message contains only the difference (delta) from the reference resource allocation, allowing terminals to reconstruct the full allocation by combining the delta with stored reference information from Absolute Grant (AG) messages. This copying approach maintains allocation accuracy while significantly reducing signaling overhead.
Solution Approach 2:
The system performs preliminary action by first transmitting complete frequency resource allocation information through Absolute Grant (AG) messages to establish a reference. Subsequent Relative Grant (RG) messages then build upon this pre-established reference, requiring only minimal additional information to convey resource adjustments. This preliminary establishment of reference information enables more efficient subsequent allocations.
2Adaptability or versatility
If frequency resources are dynamically adjusted in LTE systems with short TTI, then system adaptability is improved, but signaling overhead increases
Solution Approach 1:
The patent implements dynamic frequency resource allocation by introducing Relative Grant (RG) messages that enable flexible, real-time adjustments to resource allocations. The RG mechanism allows the system to dynamically increase or decrease frequency resources based on current channel conditions and traffic requirements, with the ability to rapidly adapt allocations across multiple TTIs without being constrained by static pre-configuration.
Solution Approach 2:
The system uses RG messages that copy and build upon previously allocated resource information, transmitting only the necessary deltas for dynamic adjustment. This approach maintains high system adaptability while minimizing the signaling overhead required to achieve dynamic resource reallocation in short TTI LTE systems.
3Reliability
If complete frequency resource information is transmitted in each scheduling message, then allocation reliability is improved, but message complexity increases
Solution Approach 1:
The patent segments frequency resource allocation information into two distinct parts: Absolute Grant (AG) messages that carry complete reference allocation information, and Relative Grant (RG) messages that carry only incremental adjustments (deltas). This segmentation allows the system to maintain allocation reliability by ensuring complete information is available in AG messages while reducing message complexity in subsequent RG messages that only need to convey changes.
Solution Approach 2:
The system performs preliminary action by transmitting complete frequency resource allocation information in advance through AG messages. This pre-transmission of reference information ensures allocation reliability is maintained, while subsequent RG messages can rely on this pre-established information rather than needing to repeat it, thereby reducing message complexity.
Data Source
AI summary
A method is provided for allocating and identifying frequency resources to a terminal in a Frequency Division Multiple Access (FDMA) system. The method includes receiving from a base station a scheduling message including frequency resource information; and calculating the allocated frequency resource based on relative information if the scheduling message is a Relative Grant (RG) message including the relative information generated on a basis of a currently used channel. The relative information includes one of an identifier of a terminal, or an identifier of a channel in use by the terminal as a terminal ID, state information indicating number of channel that stands for increase or decrease amount of frequency resources on a basis of the currently used channel, and, direction information indicating a direction of the state information.