Hybrid Radio Frame Structure for Low Latency and Legacy Compatibility
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Solution Overview
Problem
The IEEE 802.16e TDD frame structure is too long and incapable of achieving the low latency required for IEEE 802.16m protocol, necessitating a new frame structure that supports both legacy and advanced wireless communication systems while maintaining backward compatibility.
Innovation Solution
A method of allocating radio resources in a radio frame with distinct regions for IEEE 802.16(e) and IEEE 802.16(m) protocols, including a first protocol resource region and a second protocol resource region, with specific allocation control messages and pilot sub-carriers to ensure compatibility and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a new frame structure is introduced to reduce latency for IEEE 802.16m protocol, then latency performance is improved, but compatibility with legacy IEEE 802.16e systems deteriorates
Solution Approach 1:
The radio frame is divided into distinct first and second protocol resource regions, with the first region supporting legacy IEEE 802.16e protocol and the second region supporting advanced IEEE 802.16m protocol. This segmentation allows each protocol to access its designated resources without interference, enabling low latency for 802.16m while maintaining compatibility with 802.16e devices.
Solution Approach 2:
The base station is designed with multi-functionality to serve both legacy and advanced wireless terminals within the same network. The frame structure incorporates universal elements that can be interpreted by both protocol versions, allowing a single base station to maintain backward compatibility while providing enhanced low-latency services to 802.16m capable devices.
2Device complexity
If a unified frame structure is used for both legacy and advanced protocols, then device complexity is reduced, but latency performance for advanced protocol deteriorates
Solution Approach 1:
The frame structure is segmented into distinct resource regions for legacy and advanced protocols. The first protocol resource region is configured with parameters optimized for legacy devices, while the second protocol resource region uses parameters optimized for low latency in advanced devices. This segmentation allows each region to operate with its own optimal parameters without compromising the other.
Solution Approach 2:
The frame structure incorporates dynamic elements that allow the base station to adjust resource allocation between the two protocol regions based on real-time traffic conditions. This dynamic adaptation enables the system to optimize latency performance for 802.16m traffic when needed while ensuring adequate resources for legacy 802.16e devices.
3Reliability
If distinct resource regions are allocated for different protocols, then protocol-specific performance is optimized, but frame structure complexity increases
Solution Approach 1:
The frame is segmented into clearly defined first and second protocol resource regions with designated boundaries. Each region has its own allocation control message that specifies resource details for the corresponding protocol. This clear segmentation simplifies the management of protocol-specific performance by providing structured organization rather than complex interleaving.
Solution Approach 2:
Allocation control messages serve as intermediaries between the base station and wireless terminals. These messages carry protocol-specific allocation information for each resource region, allowing terminals to correctly interpret and access their designated resources. The control messages act as mediators that manage the complexity of having multiple protocol regions without requiring direct complex interaction between protocols.
Data Source
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AI summary
A wireless communication infrastructure entity configured to allocate radio resources, in a radio frame, to a wireless terminal compliant with a first protocol and to a wireless terminal compliant with a second protocol. The radio frame including a first protocol resource region and a second protocol resource region. The radio frame including a first protocol allocation control message that allocates resources within the first protocol resource region to the wireless terminal compliant with the first protocol, and a second protocol allocation control message that allocates resources within the second protocol resource region to the wireless terminal compliant with the second protocol.