CoMP Resource Element Allocation for Modulation Consistency
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Solution Overview
Problem
Coordinated Multipoint (CoMP) transmission schemes in wireless communication systems face challenges due to differences in data resource elements (REs) used by various base stations, leading to reduced performance and potential conflicts in modulation symbols across subframes, which can offset the gains in spectral efficiency and quality of the air interface.
Innovation Solution
The method involves determining and ensuring that only data REs common to all participating base stations are used for CoMP operations, with signaling providing a starting symbol index for data channels, allowing UEs to process modulation symbols consistently across all involved base stations, and base stations adjusting their transmissions to match these common REs, particularly suitable for joint transmission schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different base stations use different data resource elements (REs) for CoMP operations, then each base station can optimize its own transmission, but conflicts in modulation symbols occur across subframes reducing overall performance
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the data RE allocation parameters across different base stations to ensure they use identical REs for CoMP operations. This involves modifying the resource element mapping parameters and transmission configuration parameters to achieve consistency, thereby resolving the contradiction between individual optimization and overall performance consistency.
Solution Approach 2:
The patent implements universality by establishing a common data RE allocation scheme that all participating base stations must follow for CoMP operations. This universal approach ensures that modulation symbols remain consistent across all base stations while still allowing each station to participate in the coordinated transmission, thus maintaining both spectral efficiency and performance reliability.
2Reliability
If base stations use common data REs for CoMP operations, then modulation symbol consistency is achieved, but flexibility in optimizing individual base station transmissions is reduced
Solution Approach 1:
The patent applies segmentation by dividing the transmission resources into common data REs (used by all base stations for consistency) and non-common data REs (where individual base stations can optimize independently). This segmentation allows the system to maintain modulation symbol consistency on shared REs while preserving flexibility for individual optimization on dedicated REs.
Solution Approach 2:
The patent implements local quality by allowing different transmission optimization strategies to be applied to different portions of the resource elements. Specifically, common data REs use standardized modulation for consistency, while other REs can use base station-specific optimization techniques, thus achieving both consistency and flexibility in different locations of the resource spectrum.
3Productivity
If base stations coordinate transmissions on shared data REs, then spectral efficiency is enhanced, but complexity in determining and managing common REs increases
Solution Approach 1:
The patent applies preliminary action by pre-determining and configuring the common data RE allocation parameters before CoMP operations begin. The base stations exchange and agree upon the common RE configuration in advance, which simplifies the actual transmission process and reduces the complexity of real-time RE determination during coordinated operations.
Solution Approach 2:
The patent introduces an intermediary mechanism through the exchange of transmission configuration parameters between base stations. This intermediary process involves signaling and coordination protocols that facilitate the agreement on common data REs, managing the complexity through structured communication and parameter sharing rather than ad-hoc negotiations.
Data Source
AI summary
Certain aspects of the present disclosure relate to techniques for determining resource elements REs used for Coordinated Multipoint (CoMP) transmission schemes. The techniques generally include determining, by a User Equipment (UE), a set of data REs used for Coordinated Multipoint (CoMP) operation. The determination is based on a CoMP scheme and data REs available to particular base stations involved in the CoMP operation. The technique further includes processing data received via the CoMP operation on the determined set of data REs.