Uplink Control Information Multiplexing for Semi-Persistent Scheduling
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Solution Overview
Problem
In wireless communications, user equipment (UE) faces challenges in transmitting feedback bits due to collisions with downlink symbols, particularly when semi-persistent scheduling (SPS) transmissions overlap, leading to difficulties in multiplexing uplink control information (UCI) bits efficiently.
Innovation Solution
The UE employs techniques to defer and multiplex deferred and non-deferred UCI bits in the same slot, adjusting transmission based on availability and prioritizing resources to avoid collisions, allowing for efficient use of uplink symbols and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE transmits feedback bits in the first set of uplink symbols, then the feedback transmission is timely, but collisions with downlink symbols occur
Solution Approach 1:
The UE checks the availability of the first set of uplink symbols before transmitting feedback bits. If a collision with downlink symbols is detected, the UE preemptively defers the transmission to the second set of uplink symbols, avoiding the collision before it occurs.
Solution Approach 2:
The transmission timing of feedback bits is made dynamic rather than fixed. The UE adapts the transmission slot based on the availability of uplink symbols and the presence of downlink symbols, selecting between the first set of uplink symbols (when available) and the second set of uplink symbols (when collision is detected).
2Object-affected harmful factors
If the UE defers feedback bits to the second set of uplink symbols, then collision with downlink symbols is avoided, but the transmission timing is delayed
Solution Approach 1:
The UE identifies and defers to the second set of uplink symbols in advance when the first set is found to be unavailable, ensuring collision-free transmission while minimizing delay by selecting the earliest available alternative.
Solution Approach 2:
The UE changes the transmission parameter (time slot) from the first set of uplink symbols to the second set of uplink symbols based on the availability condition, optimizing the balance between timely transmission and collision avoidance.
3Productivity
If the UE multiplexes deferred and non-deferred UCI bits in the same slot, then resource utilization is improved, but the complexity of determining transmission increases
Solution Approach 1:
The UE segments UCI bits into deferred and non-deferred categories based on their transmission timing requirements. This segmentation allows the UE to apply different multiplexing rules: non-deferred bits follow original scheduling, while deferred bits are multiplexed only when the slot is determined to be available for both types.
Solution Approach 2:
The UE applies partial multiplexing by combining deferred and non-deferred UCI bits only when necessary and when the slot capacity allows. The UE does not force multiplexing in all cases, but rather applies it selectively to improve resource utilization without excessive complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may monitor for one or more semi-persistent scheduling (SPS) transmissions according to one or more SPS configurations. The UE may generate a set of feedback bits associated with the SPS transmissions, the feedback bits scheduled for transmission in a first set of uplink symbols. The UE may receive control signaling that changes an availability of the first set of uplink symbols for transmission of the set of feedback bits, and then defer transmission of the set of feedback bits to a second set of uplink symbols. The UE may determine whether to transmit at least a portion of the set of feedback bits in the second set of uplink symbols, and may transmit at least the portion of the set of feedback bits in the second set of uplink symbols and communicate in accordance with the determining.