Subscriber Station Uplink Resource Segmentation for Direct Data Exchange
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Solution Overview
Problem
Current Time Division Duplexing (TDD) wireless communication systems, such as IEEE 802.16 and LTE, do not support direct data transmission between subscriber stations, requiring all data to be relayed through a base station, which is inefficient and lacks direct subscriber-to-subscriber communication capabilities.
Innovation Solution
A method where a subscriber station uses uplink resources assigned for communication with an infrastructure station to exchange data with a neighboring subscriber station by embedding a subscriber-to-subscriber message payload within a transmission structured to be processed as if it were part of an uplink message to the infrastructure station, using a different modulation and coding scheme for the payload, allowing the infrastructure station to remain unaware of the direct communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all data is relayed through the base station between subscriber stations, then the existing TDD system architecture is maintained, but the data transfer efficiency and network capacity are reduced
Solution Approach 1:
The patent segments the communication path into two types: traditional SS-BS-SS paths for general traffic, and direct SS-SS paths for localized subscriber-to-subscriber traffic. This segmentation allows efficient direct communication between nearby subscriber stations while maintaining the existing base station infrastructure for other communications, thereby improving data transfer efficiency without requiring complete system redesign
Solution Approach 2:
The base station acts as an intermediary that enables direct SS-SS communication by allocating uplink resources and managing the communication framework, without requiring modification to the subscriber stations themselves. The BS provides control signals and resource allocation while the actual data transfer occurs directly between subscriber stations, resolving the contradiction by maintaining infrastructure complexity while improving productivity
2Productivity
If direct subscriber-to-subscriber communication is implemented, then data transfer capacity increases, but the existing communication standards and infrastructure require modification
Solution Approach 1:
Subscriber stations utilize their existing uplink transmission capabilities to communicate directly with each other, making the subscriber stations self-sufficient for direct communication without requiring additional infrastructure or modifications to the base station hardware. The BS simply allocates resources and the SSs handle their own direct communication, improving data transfer capacity while maintaining ease of implementation
Solution Approach 2:
The uplink resources allocated by the base station serve dual purposes: traditional uplink communication with the base station and direct subscriber-to-subscriber communication. This multi-functionality allows the same physical resources to support both communication modes, increasing data transfer capacity without requiring separate infrastructure or complex implementation
3Adaptability or versatility
If uplink resources are used for subscriber-to-subscriber communication, then direct link capabilities are enabled, but the infrastructure station must process and interpret the transmitted messages
Solution Approach 1:
The patent extracts the subscriber-to-subscriber message payload from the base station's processing domain by embedding it within the uplink message structure. The base station processes only the necessary control and routing information, while the actual S2S communication content is handled directly between subscriber stations, enabling direct link capability without increasing infrastructure processing complexity
Data Source
AI summary
A subscriber station (SS) utilizes uplink resources that have been assigned to it for communicating with an infrastructure station to exchange data with a neighboring SS while maintaining its link to the infrastructure station. This is accomplished by the SS receiving an uplink allocation from the infrastructure station, transmitting a subscriber-to-infrastructure station header and trailer to the infrastructure station using the modulation and coding scheme (MCS) assigned by the infrastructure station and also transmitting a subscriber-to-subscriber (S2S) message payload, optionally using a second MCS level appropriate for the link between itself and the receiving SS. The subscriber to infrastructure station message is composed so that it occupies the first m codewords and contains a header that describes the length of the subscriber to infrastructure station message. The subscriber to infrastructure station message, then, is followed by the S2S message, composed to occupy the remaining symbols of the allocation.