Uplink Resource Allocation Indicator for Asymmetric TDD Frames
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Solution Overview
Problem
In broadband wireless communication systems, particularly in IEEE 802.16 m systems, there is a need to reduce signaling overhead and avoid resource loss when indicating uplink resource allocation, especially when only the long Transmission Time Interval (TTI) is considered in Time Division Duplex (TDD) frames with asymmetric links.
Innovation Solution
A 2-bit indicator Transmission Time Interval (TTI) and Relevance field is used to indicate the location of UpLink subframes and the burst transmission characteristic, allowing for efficient burst allocation without additional signaling overhead by defining correspondence based on the ratio of DownLink to UpLink subframes, enabling the indication of default TTI and long TTI within the same frame structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If only long TTI burst allocation is considered in TDD frames, then resource loss occurs in UL subframes, but adding separate indication for default TTI increases signaling overhead
Solution Approach 1:
The patent combines the indication of default TTI and long TTI burst allocations into a single A-MAP IE structure. By merging both allocation types into one signaling message with a unified indicator field, the system avoids the need for separate signaling messages, thereby preventing additional signaling overhead while ensuring that neither default TTI nor long TTI resources are lost.
Solution Approach 2:
The A-MAP IE is designed to serve multiple functions simultaneously: it can indicate both default TTI burst allocations and long TTI burst allocations within the same message structure. The indicator field within the A-MAP IE can differentiate between allocation types, allowing a single signaling mechanism to handle multiple burst allocation characteristics without requiring separate dedicated signaling paths.
2Reliability
If separate A-MAP IEs are used for default TTI and long TTI, then resource allocation is clear, but signaling overhead increases
Solution Approach 1:
Instead of using separate A-MAP IEs for default TTI and long TTI allocations, the patent merges both allocation types into a single A-MAP IE. This unified structure contains an indicator field that can distinguish between allocation types, providing clear resource allocation information while reducing the total signaling overhead compared to transmitting multiple separate IEs.
3Measurement precision
If 3-bit UL subframe index is used, then precise subframe location is indicated, but when combined with TTI type indication, total overhead reaches 4 bits
Solution Approach 1:
The patent merges the TTI type indication and UL subframe index indication into a single integrated indicator field within the A-MAP IE. This unified indicator provides both pieces of information (TTI type and subframe location) simultaneously, maintaining precise subframe location indication while optimizing the total bit overhead by eliminating redundant signaling structures.
Data Source
AI summary
An apparatus and a method for indicating uplink resource allocation in a broadband wireless communication system are provided. The method includes decoding an UpLink (UL) resource allocation Information Element (IE) in a received DownLink (DL) subframe, extracting an indicator field value from the decoded UL resource allocation IE, the indicator field value indicating a Transmission Time Interval (TTI) type for a resource allocated to the terminal and a UL subframe location, and transmitting UL data through a resource allocated to the terminal based on the extracted indicator field value.