V2X UE Synchronization and Power Control for Reliable Decoding
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Solution Overview
Problem
In LTE Rel-14 V2X communication, the existing MCS table limits decoding capabilities, and the power relationship between PSCCH and PSSCH is not optimal, leading to incorrect decoding of data packets when the coding rate exceeds 0.93, and interference issues in V2X communications due to unsynchronized PSBCH transmission.
Innovation Solution
A method and device for V2X communications that adjust the MCS table and power control parameters to ensure correct decoding and reduce interference by determining the search space for S-DCI, optimizing power control for PSCCH and PSSCH, and synchronizing SLSS and PSBCH transmission based on cellular network coverage and reference synchronization sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing MCS table is used in LTE Rel-14 V2X communication, then the system maintains compatibility with existing standards, but the decoding capability is limited and incorrect decoding occurs when the coding rate exceeds 0.93
Solution Approach 1:
The patent introduces a new MCS table with modified parameters specifically designed for V2X communication scenarios. This new table extends the supported coding rate range beyond 0.93 while maintaining appropriate decoding accuracy, allowing the system to adapt to higher coding rates required in certain V2X conditions without being constrained by the existing LTE Rel-14 MCS table limitations.
2Productivity
If the power relationship between PSCCH and PSSCH is maintained at existing levels, then the control channel maintains its standard power allocation, but the data channel transmission efficiency is suboptimal
Solution Approach 1:
The patent implements dynamic power adjustment mechanisms where the power allocation between PSCCH and PSSCH is no longer fixed but can be adaptively changed based on channel conditions, traffic requirements, and interference levels. This allows the system to optimize data transmission efficiency by allocating more power to PSSCH when needed while ensuring sufficient power for PSCCH control functions.
3Ease of operation
If PSBCH transmission is performed without synchronization, then each UE can transmit independently according to its own timing, but interference issues occur and PSBCH detection fails
Solution Approach 1:
The patent establishes a common timing reference and synchronization mechanism for PSBCH transmissions across multiple UEs. By aligning all UEs to the same time-frequency resources and transmission timing based on a reference signal, the system eliminates interference between simultaneous transmissions while maintaining the ability of each UE to transmit PSBCH independently according to its data needs.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present invention provides a method and device for vehicle to everything (V2X) communications. The method comprises: receiving configuration signaling transmitted by an eNB, and then determining, according to the configuration signaling, at least one of a search space corresponding to S-DCI_C, a transmission carrier of S-DCI_C, and the number of bits corresponding to S-DCI_C; or determining, according to the configuration signaling, at least one optional time position information for transmitting a Side Link Synchronization Signal (SLSS) and a Physical Sidelink Broadcast CHannel (PSBCH), and then, based on coverage state about whether a first UE is within cellular network coverage, according to the type of a reference synchronization source, determining time position information from the at least one optional time position information for transmitting the SLSS and the PSBCH, identity information of the SLSS to be transmitted, and the value of the inCoverage field in the PSBCH to be transmitted. The present application also provides a transmitting and receiving method in V2X communication, comprising the steps of: detecting, by a first-type UE, a PSCCH in format of SCI X transmitted by other UEs, and determining, according to the SCI X, whether to further measure PSSCH-RSRP of a PSSCH scheduled by the SCI X and whether to further decode the PSSCH scheduled by the SCI X. The method provided by the present application further comprises the steps of: detecting, by a second-type UE, a PSCCH in format of SCI X transmitted by other UEs, and determining, according to a modulation and coding bit field in the SCI X and a predefined TBS mapping rule, a TBS of a PSSCH scheduled by the SCI X. The method provided by the present application further comprises the step of: determining, by the second-type UE and according to a modulation scheme, the transmitting power of the PSCCH of the SCI X and the transmitting power of the PSSCH scheduled by the SCI X. By the above method, the coexistence of a first-type V2X UE and a second-type V2X UE can be better realized, and the transmission efficiency of the second-type V2X UE can be improved.