Channel Allocation in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, particularly those using the IEEE 802.16e standard with OFDMA and TDD, face inefficiencies due to large signaling overhead and reduced MAC efficiency caused by separate allocation messages for downlink and uplink channels, leading to a rigid frame structure.
Innovation Solution
Allocating downlink and uplink traffic channels and their associated control channels in a single message, allowing flexible positioning within the frame, thereby reducing signaling overhead and enhancing MAC efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate allocation messages are used for downlink and uplink channels, then channel allocation can be performed independently for each direction, but signaling overhead increases and MAC efficiency decreases
Solution Approach 1:
The patent combines the allocation of downlink traffic channel and uplink control channel into a single allocation message. The base station allocates both channels simultaneously using one message instead of separate messages, reducing signaling overhead while maintaining the ability to independently control each channel's resources and parameters
2Device complexity
If separate allocation messages are used for downlink and uplink channels, then channel management is simplified, but MAC efficiency is reduced
Solution Approach 1:
The patent merges the allocation process into a single message that simultaneously assigns downlink traffic channel and uplink control channel. This reduces the number of MAC processing steps and messages handled, improving MAC efficiency while keeping the allocation logic integrated and manageable
3Device complexity
If predetermined relative locations are used for traffic and control channels, then allocation is simplified, but frame structure flexibility is reduced
Solution Approach 1:
The patent implements dynamic channel allocation where the relative positions of downlink traffic channels and uplink control channels within the frame are not fixed but can be flexibly determined based on current system conditions, traffic demands, and resource availability, allowing the frame structure to adapt to varying operational requirements
4Manufacturing precision
If multiple messages are used for allocating logically paired channels, then precise control is achieved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple allocation messages into a single message that simultaneously allocates downlink traffic channel and uplink control channel. The message includes separate field sets for each channel type, allowing precise control over each channel's parameters, resources, and characteristics while reducing the total number of messages and associated signaling overhead
Data Source
AI summary
Systems and methods for allocating traffic and associated control channels are provided. A downlink traffic control message can include an identification of a downlink traffic channel and an identification of an associated uplink control channel. An uplink traffic control message can include an identification of an uplink traffic channel and an identification of an associated downlink control channel in a frame subsequent to the frame of the uplink traffic channel. The associated control channels can be a feedback channel, which can provide power control information, retransmission request information, channel quality indication information and/or the like.