D2D Signal Transmission Subframe Segmentation for SRS Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting Device-to-Device (D2D) signals, particularly in configuring SRS transmission and determining the appropriate subframe for D2D signal transmission based on SRS configuration information and timing advance considerations.
Innovation Solution
A method and apparatus for transmitting D2D signals in a wireless communication system, where a User Equipment (UE) receives SRS configuration information from a Base Station (BS) to determine whether to transmit a D2D signal in a specific subframe, considering the Cyclic Prefix (CP) and Timing Advance (TA) to ensure efficient D2D signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D signal transmission is performed in uplink subframes, then device-to-device communication capability is enabled, but interference with uplink signals (such as SRS) transmitted to the base station occurs
Solution Approach 1:
The patent segments the uplink subframe into distinct transmission regions: D2D signal transmission in the first part and SRS transmission in the second part. This segmentation allows both D2D communication and uplink signaling to coexist in the same subframe by allocating separate time resources, thereby enabling D2D capability while preventing interference with SRS transmissions to the base station.
Solution Approach 2:
The patent applies preliminary action by configuring D2D transmission parameters and identifying suitable subframes in advance through higher-layer signaling. The network pre-configures D2D subframe patterns and timing advance values, allowing UEs to prepare and transmit D2D signals at predetermined times before potential interference with SRS occurs, ensuring coexistence through advance planning.
2Reliability
If D2D signal transmission timing is adjusted using Timing Advance (TA), then synchronization with the base station is improved, but determination of appropriate D2D subframes becomes more complex
Solution Approach 1:
The patent introduces the base station as an intermediary that centralizes the complexity of TA-based subframe determination. The base station receives UE timing advance information, calculates the appropriate D2D transmission subframes considering both TA and SRS configurations, and provides clear indications to UEs through higher-layer signaling. This mediator approach maintains synchronization accuracy while reducing UE complexity by offloading the complex determination logic to the network.
3Measurement precision
If SRS transmission is performed in uplink subframes, then uplink channel quality measurement is enabled, but available resources for D2D signal transmission are reduced
Solution Approach 1:
The patent segments the uplink subframe structure to accommodate both SRS and D2D transmissions. By dividing the subframe into distinct time regions with SRS transmitted in specific symbols and D2D signals in other symbols or regions, the system enables uplink channel quality measurement through SRS while preserving sufficient time-frequency resources for D2D communication, thus resolving the resource conflict.
Data Source
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AI summary
The present invention provides a method for transmitting a device-to-device (D2D) signal and an apparatus for the same, which are used in a wireless access system supporting D2D communication. According to one aspect of the present invention, the method for transmitting a D2D signal by a terminal comprises the steps of: receiving, from a base station, sounding reference signal configuration information instructing an uplink subframe to transmit a sounding reference signal; and determining whether to transmit the D2D signal in a D2D subframe set in a specific subframe when the specific subframe is included in the sounding reference signal configuration information.