Multi-TRP PDCCH Repetitions for Reliable Control Signaling
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Solution Overview
Problem
Existing systems face challenges in determining how a UE knows which PDCCH candidates in multiple CORESETs carry the same DCI for soft combining, and defining the time offset between PDCCH reception and the corresponding PDSCH in scenarios with PDCCH repetition.
Innovation Solution
Implementing PDCCH repetitions over multiple CORESETs with either different or same channel encoding, and defining a time offset based on the last symbol of the PDCCH repetitions for scheduling PDSCH or PUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetitions are transmitted over multiple CORESETs, then PDCCH reliability is improved through soft combining, but the complexity of determining which PDCCH candidates carry the same DCI increases
Solution Approach 1:
The network pre-configures the UE with multiple CORESETs and associated search space sets before PDCCH transmission. The UE is provided with configuration parameters including CORESET identifiers, frequency resources, time durations, and associations with search space sets, enabling the UE to prepare the correct reception resources in advance without complex real-time determination
Solution Approach 2:
The PDCCH transmission is segmented across multiple CORESETs, each with its own search space set. The UE monitors PDCCH candidates in each search space set independently, and the network ensures that corresponding PDCCH candidates across different search space sets carry the same DCI for soft combining, dividing the complex task into manageable segments
2Reliability
If PDCCH repetitions use different channel encoding, then diversity gain is improved, but the difficulty of determining time offset between PDCCH and PDSCH increases
Solution Approach 1:
The network pre-defines the time offset relationship between PDCCH repetitions and the scheduled PDSCH/PUSCH. The time offset is determined based on the last symbol of the PDCCH repetitions, and this relationship is established through configuration parameters provided to the UE in advance, eliminating the need for complex real-time measurement
Solution Approach 2:
The patent introduces an intermediary mechanism where the time offset is not directly measured but derived through configured parameters and rules. The network provides configuration information that mediates the time offset determination, allowing the UE to calculate the correct offset without direct measurement, thus simplifying the detection process
Data Source
AI summary
Systems and methods are disclosed herein for improving the reliability of a physical downlink control channel (PDCCH) transmission and reception. In one embodiment, a method performed by a wireless communication device for reception of PDCCH repetitions over multiple control resource sets (CORESETs) in a cellular communications system comprises receiving a configuration of a first CORESET and a second CORESET. The method further comprises receiving, from one or more network nodes, a first repetition of a PDCCH carrying downlink control information (DCI) in the first CORESET and a second repetition of the PDCCH carrying the same DCI in the second CORESET, wherein the first and second repetitions of the PDCCH have either: (a) different channel encoding or (b) a same channel encoding. The method further comprises decoding the DCI based on the first repetition of the PDCCH and/or the second repetition of the PDCCH.