TDD Switching Time Extension for P2P Spectrum Sharing
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Solution Overview
Problem
Current wireless communication systems cannot utilize the same frequency band for both infrastructure and peer-to-peer communications without causing interference, particularly in Time Division Duplexing (TDD) systems, limiting the flexibility and efficiency of device operations.
Innovation Solution
Implementing a method where devices switch between downlink and uplink modes during extended time periods, allowing peer-to-peer communications to occur within these intervals using the same frequency band as TDD systems, while adhering to cellular communication protocols by refraining from infrastructure signal transmission during switching times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the same frequency band is used for both infrastructure and peer-to-peer communications, then frequency spectrum utilization is improved, but interference between infrastructure signals and peer-to-peer signals occurs
Solution Approach 1:
The frequency band is segmented into distinct time intervals: infrastructure communication time periods and peer-to-peer communication time periods. During infrastructure time periods, only infrastructure signals are transmitted; during peer-to-peer time periods, only peer-to-peer signals are transmitted. This temporal segmentation eliminates interference while maintaining high frequency spectrum utilization.
Solution Approach 2:
The system implements periodic switching between infrastructure communication mode and peer-to-peer communication mode using TDD principles. The base station and user equipment periodically alternate between transmitting/receiving infrastructure signals and engaging in peer-to-peer communications, ensuring that both types of communications share the same frequency band without interfering with each other.
2Adaptability or versatility
If TDD switching time periods are extended to accommodate peer-to-peer communications, then peer-to-peer communication capability is improved, but infrastructure communication efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts the duration and frequency of TDD switching time periods based on peer-to-peer communication demand. When peer-to-peer communications are active, the switching time periods are extended to accommodate them; when not needed, the infrastructure communication time periods are maximized. This dynamic adjustment ensures both peer-to-peer capability and infrastructure efficiency are optimized.
Data Source
AI summary
Methods and apparatus for supporting peer to peer and infrastructure, e.g., cellular, communication in a multimode device which can operate in a cellular system are described. Methods and apparatus for supporting peer to peer devices are also described. Peer to peer communication occurs within a switching time period during which infrastructure signaling does not occur and devices switch between an uplink and a downlink mode of infrastructure operation. The time period set for the switching time period is intentionally set larger, e.g., 10, 50, 100 or even more times larger than that required based on maximum cell size. Thus, a peer to peer communications period can be introduced into a TDD system and use the same frequency band as the TDD system in a manner that can remain compliant with a cellular communications protocol which allows for a switching time period, e.g., set in the system by a parameter.