OCC-Based PUSCH Multiplexing With Pi/2 BPSK Modulation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing uplink communications using orthogonal cover code (OCC) based physical uplink shared channel (PUSCH) schemes with π/2 binary phase shift keying (BPSK) modulation, leading to poor spectral efficiency, decreased network capacity, and high communication errors.
Innovation Solution
A method and apparatus for wireless communication that enable a user equipment (UE) to communicate with a network node using an OCC-based PUSCH multiplexing scheme while employing π/2 BPSK modulation. This is achieved by transmitting and receiving indications of OCC parameters, allowing the UE to transmit PUSCH communications based on these parameters and using π/2 BPSK modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If OCC-based PUSCH multiplexing is used with conventional modulation, then network capacity is improved, but spectral efficiency deteriorates when using π/2 BPSK modulation
Solution Approach 1:
The patent changes the modulation parameter from conventional QPSK to π/2 BPSK modulation, which uses a different constellation diagram and phase transitions. This parameter change enables the system to achieve both OCC-based multiplexing capability and improved spectral efficiency by exploiting the unique properties of π/2 BPSK where the phase transitions occur at ±π/2 rather than 0 and π, thereby resolving the contradiction between maintaining network capacity through OCC multiplexing and improving spectral efficiency
Solution Approach 2:
The patent introduces dynamic OCC parameter configuration where the network can adaptively select OCC parameters based on channel conditions and traffic requirements. This dynamic adjustment allows the system to optimize the balance between network capacity and spectral efficiency by selecting appropriate OCC lengths and patterns that work well with π/2 BPSK modulation under different operating conditions
2Device complexity
If OCC parameters are not properly configured for π/2 BPSK, then device complexity is reduced, but communication reliability deteriorates
Solution Approach 1:
The patent implements preliminary configuration of OCC parameters through network signaling before actual data transmission. The network node provides OCC parameter indications to the UE in advance, allowing the device to prepare the appropriate multiplexing configuration without increasing operational complexity. This preliminary action ensures that the correct OCC parameters are used for π/2 BPSK modulation, thereby maintaining communication reliability while keeping device complexity manageable
Solution Approach 2:
The patent introduces an intermediary signaling mechanism where the network node mediates the OCC parameter configuration between the standard specification and the actual transmission. This intermediary layer translates high-level multiplexing requirements into specific OCC parameters suitable for π/2 BPSK modulation, reducing the complexity burden on UEs while ensuring reliable communication through proper parameter selection
3Loss of information
If conventional multiplexing is used without OCC parameter indication, then signaling overhead is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent makes the existing OCC parameter indication mechanism universal by enabling it to work with both conventional modulation schemes and π/2 BPSK modulation. The same signaling framework is used to convey OCC parameters regardless of the modulation type, allowing the system to achieve improved spectral efficiency through π/2 BPSK while maintaining acceptable signaling overhead by reusing existing universal signaling structures rather than creating modulation-specific signaling
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of one or more orthogonal cover code (OCC) parameters associated with an OCC-based physical uplink shared channel (PUSCH) multiplexing scheme using π/2 binary phase shift keying (BPSK) modulation. The UE may transmit a PUSCH communication based at least in part on the one or more OCC parameters and by using the π/2 BPSK modulation. Numerous other aspects are described.