PUSCH OCC Frequency Hopping for Concurrent UE Repetitions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing available resources due to interference and reduced throughput caused by signal repetitions, particularly in scenarios involving multiple user equipment (UEs) transmitting concurrently, which leads to increased signaling overhead and reduced capacity.
Innovation Solution
Implementing orthogonal cover code (OCC) sequences for uplink transmissions, including intra-symbol, intra-slot, and frequency hopping applications, as indicated by network entities (NEs) to UEs, allowing concurrent transmissions without interference by applying OCC sequences across time and frequency domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal repetitions are used for uplink transmissions, then reliability is improved, but interference increases and throughput decreases
Solution Approach 1:
Orthogonal cover codes serve as intermediaries between multiple UEs transmitting on the same resources. Each UE is assigned a unique OCC sequence that orthogonally separates their transmissions, allowing the base station to distinguish and decode multiple simultaneous repetitions without interference, thus maintaining both reliability and throughput
2Productivity
If multiple UEs transmit concurrently on the same resources, then system capacity is improved, but interference increases
Solution Approach 1:
OCC sequences act as intermediaries that enable multiple UEs to share the same time-frequency resources. The orthogonal properties of these codes allow the base station to separate and decode individual UE transmissions even when they occur simultaneously on identical resources, thereby increasing system capacity without introducing harmful interference
Solution Approach 2:
The system changes the code domain parameter by assigning different OCC sequences to different UEs. This code-based separation transforms the problem from frequency/time domain resource allocation to code domain multiplexing, allowing multiple UEs to coexist on the same physical resources with distinguishable signal characteristics
3Productivity
If OCC sequences are applied across time and frequency domains, then resource utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The OCC application is segmented into distinct time-domain and frequency-domain components. In the time domain, different OCC sequences are applied to different slots or symbols, while in the frequency domain, different OCC sequences are applied to different resource blocks. This segmentation allows for modular implementation and reduces overall processing complexity
Data Source
AI summary
Various aspects of the present disclosure relate to orthogonal cover code (OCC) sequence application with frequency hopping. An apparatus, such as a UE, receives signaling that indicates one or more parameters associated with at least one orthogonal cover code (OCC) sequence. The UE applies the at least one OCC sequence to a physical uplink shared channel (PUSCH) transmission based on the one or more parameters. The PUSCH transmission includes a set of repetitions of uplink data. The UE applies the OCC sequence within respective slots of a set of slots, across the respective slots, or both. At least one repetition of the set of repetitions is offset from at least one other repetition of the set of repetitions by a frequency offset. The UE transmits the PUSCH transmission using set of slots and the frequency offset.