Orthogonal Resource Selection for LTE PUCCH Transmit Diversity
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Solution Overview
Problem
In LTE communication systems, the existing methods for Ack/Nack feedback using channel selection face challenges in ensuring that PUCCH resources for reference symbols and data symbols are in the same Physical Resource Block (PRB), especially when resources are signaled partly using the primary cell (PCell) and partly using secondary cells (SCells), leading to potential interference and reduced performance.
Innovation Solution
The proposed solution involves implementing STRSD codes that adjust resource allocation to ensure PUCCH resources for both reference and data symbols are in the same PRB, using time-constrained and time-varying STRSD schemes, which simplify resource allocation by signaling pairs of PUCCH resources within the same PRB without altering existing resource allocation methods, and altering signaling to place resources in the same PRB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If channel selection is used for Ack/Nack feedback with multiple PUCCH resources signaled across PCell and SCells, then carrier aggregation support is improved, but PUCCH resources for reference symbols and data symbols may end up in different PRBs causing interference and performance degradation
Solution Approach 1:
The patent changes the parameter of PUCCH resource allocation by introducing STRSD codes that map PUCCH resources to the same PRB. The time-constrained and time-varying STRSD schemes adjust resource allocation parameters dynamically while maintaining the constraint that reference and data symbols share the same PRB, thus resolving the alignment issue while preserving carrier aggregation support
Solution Approach 2:
The patent applies dynamic resource allocation through time-varying STRSD codes that adapt PUCCH resource assignment based on channel conditions and scheduling requirements. This dynamic approach allows the system to maintain PUCCH resource alignment within the same PRB while supporting flexible carrier aggregation configurations
2Adaptability or versatility
If PUCCH resources for reference symbols and data symbols are in different PRBs, then resource allocation flexibility is improved, but transmit power requirements increase and performance decreases due to interference
Solution Approach 1:
The patent changes the resource allocation parameters by constraining PUCCH resources to the same PRB through STRSD coding. This parameter adjustment reduces the frequency separation between reference and data symbols, minimizing interference and reducing the transmit power needed to achieve the same performance level
3Device complexity
If existing resource allocation methods are used without modification, then implementation complexity is reduced, but PUCCH resources cannot be guaranteed to be in the same PRB when using carrier aggregation
Solution Approach 1:
The patent segments the resource allocation process into two independent parts: (1) existing methods for signaling PUCCH resources on PCell and SCells, and (2) STRSD code-based mapping that ensures resources fall within the same PRB. This segmentation maintains the simplicity of existing allocation methods while adding the alignment guarantee through a separate coding layer
Data Source
AI summary
Methods of allocating orthogonal resources of a wireless communication network to a user equipment (UE) that uses transmit diversity are disclosed. In one or more embodiments, the UE is configured to transmit a reference symbol and a modulated symbol on multiple orthogonal resources on an antenna. The method includes: selecting, by the UE, a first and a second orthogonal resource, respectively, from a plurality of orthogonal resources according to the state of information bits to be communicated by the UE; and transmitting, by the UE, the reference and data symbols on the first and the second orthogonal resource, respectively, on one antenna. The first and the second resource are different for at least one of the states of the information bits. The first and the second resource are both in the same physical resource block.