Frame Allocation for Legacy Wireless Protocol Coexistence
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Solution Overview
Problem
The coexistence of legacy 802.16(e) and advanced 802.16(m) wireless communication systems poses a challenge due to differences in frame structures, particularly in subchannelization modes, leading to increased complexity for 802.16(m) mobile stations when trying to support both protocols without altering the system's complexity.
Innovation Solution
A frame structure is designed with concatenated subframes, where the first subframe is divided into two portions to support legacy PUSC control channels and Band-AMC data channels, while the second subframe is allocated for both legacy and advanced protocol data channels using frequency division multiplexing, ensuring compatibility and reducing system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both 802.16(e) and 802.16(m) protocols are supported in the same system, then backward compatibility is improved, but system complexity increases due to different frame structures and subchannelization modes
Solution Approach 1:
The frame structure is segmented into two distinct portions: a first portion that supports legacy 802.16(e) PUSC control channels with 4-subcarrier tiles, and a second portion that supports both legacy Band-AMC data channels and advanced 802.16(m) channels. This segmentation allows each portion to be optimized for its specific protocol requirements without forcing the entire system to accommodate both, thereby reducing overall system complexity while maintaining backward compatibility.
Solution Approach 2:
Different subchannelization modes are applied to different portions of the frame based on local requirements. The first portion uses PUSC mode with 4-subcarrier tiles specifically for legacy control channels, while the second portion uses a unified 6-subcarrier tile structure for both legacy and advanced data channels. This local differentiation resolves the contradiction by allowing protocol-specific optimizations in appropriate regions without propagating complexity system-wide.
2Adaptability or versatility
If 802.16(m) data channels use 6-subcarrier tiles while supporting legacy 802.16(e) PUSC mode with 4-subcarrier tiles, then protocol evolution is achieved, but mobile station complexity increases due to supporting multiple tile sizes
Solution Approach 1:
The legacy PUSC control channel requirement is extracted and isolated into the first portion of the frame, where it can be handled separately from the advanced 802.16(m) data channels in the second portion. This extraction allows mobile stations to process legacy control information without needing to simultaneously manage multiple tile size interpretations for data channels, thereby reducing mobile station complexity while preserving protocol evolution capabilities.
Solution Approach 2:
The system dynamically adapts tile size based on the channel type and portion of the frame. Control channels in the first portion use 4-subcarrier tiles, while data channels in the second portion use 6-subcarrier tiles. This dynamic adaptation is managed through clear frame structure signaling, allowing mobile stations to switch between tile size interpretations based on the current transmission context rather than supporting all tile sizes simultaneously, thus reducing complexity.
3Adaptability or versatility
If control channels use PUSC mode with 4-subcarrier tiles and data channels use Band-AMC mode with 9-subcarrier bins, then protocol functionality is maintained, but frame structure complexity increases due to multiple resource allocation units
Solution Approach 1:
In the second portion of the frame, legacy Band-AMC data channels and advanced 802.16(m) data channels are merged into a unified resource allocation structure using 6-subcarrier tiles. This merging eliminates the need to separately manage 9-subcarrier bins and 6-subcarrier tiles, reducing frame structure complexity while maintaining support for both legacy and advanced data channel functionalities through a common resource grid.
Data Source
AI summary
A frame (200) and a method for allocating resources that is used in a wireless communication network is provided. The frame includes a first subframe (202) concatenated to a second subframe (204). A first portion (206) of the first subframe allocated for a control channel of a first protocol. A second portion (208) of the first subframe and the second subframe are allocated for a data channel for the first protocol. In an embodiment second portion of the first subframe and the second subframe are allocated for a data channel of the second protocol that are multiplexed with the data channel of the first protocol using frequency division multiplexing (FDM).