LTE TDD Subframe Configuration for P2P Communication
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Solution Overview
Problem
Current LTE TDD systems face challenges in efficiently supporting peer-to-peer communication due to limitations in configuring subframes for optimal resource utilization, leading to suboptimal performance in handling both wide area network control signals and peer-to-peer communication.
Innovation Solution
The method involves configuring specific subframes within a radio frame for peer-to-peer communication by allocating symbols or portions of the frame for peer-to-peer use, such as in multicast broadcast single frequency network (MBSFN) subframes and special TDD subframes, allowing for dedicated resources for peer-to-peer communication without interfering with wide area network control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE TDD subframes are configured for traditional communication, then wide area network control signals can be transmitted, but peer-to-peer communication resources are limited and base station load remains high
Solution Approach 1:
The patent segments subframes into different types (first subframes for traditional communication, second subframes for peer-to-peer communication, and optional third subframes for both modes). This segmentation allows independent optimization of each subframe type for its specific communication needs, resolving the contradiction by enabling peer-to-peer efficiency without compromising traditional control signal transmission.
Solution Approach 2:
The patent implements dynamic configuration where the network can flexibly assign subframes to different communication modes based on traffic conditions. The eNodeB can dynamically determine whether to use first, second, or third subframes for peer-to-peer communication, providing adaptability that improves efficiency while managing configuration complexity through network-controlled flexibility.
2Productivity
If more subframes are allocated for peer-to-peer communication, then data rate and capacity improve, but base station load management becomes more challenging
Solution Approach 1:
The patent applies local quality by treating different subframes differently - first subframes maintain traditional communication quality for control signals, while second subframes optimize for peer-to-peer data transmission. This localized optimization allows high data rates for peer-to-peer communication in designated subframes without overloading the base station during critical control transmission periods.
Solution Approach 2:
The patent ensures continuous useful action by maintaining both traditional communication and peer-to-peer communication capabilities simultaneously through different subframe allocations. The network can continuously serve both communication needs without interruption, improving overall system productivity while distributing base station load across multiple subframe types rather than concentrating it in a single mode.
3Ease of operation
If subframe configuration is simplified, then ease of operation improves, but resource allocation optimization is reduced
Solution Approach 1:
The patent implements universality by creating third subframes that can serve dual purposes - functioning as either first subframes for traditional communication or second subframes for peer-to-peer communication based on network needs. This multi-functionality simplifies configuration by reducing the total number of distinct subframe types while maintaining optimized resource allocation for both communication modes, resolving the contradiction between simplicity and optimization.
Data Source
AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus receives a configuration indicating multicast broadcast single frequency network (MBSFN) subframes within a radio frame. The configuration indicates a number of symbols of an MBSFN subframe for receiving a wide area network (WAN) control signal and remaining symbols of the MBSFN subframe dedicated for peer-to-peer communication. The apparatus communicates with a peer via the symbols dedicated for peer-to-peer communication. Alternatively, the apparatus receives a configuration indicating a portion at a beginning and/or end of a guard period of a special time division duplex (TDD) subframe. The portion is reserved for an uplink timing advance and/or switching from transmission to reception and/or reception to transmission. The configuration also indicates a remaining portion of the guard period of the special TDD subframe for peer-to-peer communication. The apparatus communicates with a peer via the remaining portion.