PDCCH Blind Decoding Budget Allocation in Dual Connectivity
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Solution Overview
Problem
In wireless communication systems, particularly in dual connectivity mode, there is a challenge in allocating physical downlink control channel (PDCCH) blind decoding candidates among master and secondary cell groups, leading to processing resource limitations and potential overbooking of user equipment (UE) with PDCCH candidates, which affects control signaling performance and battery life.
Innovation Solution
The solution involves allocating a resource budget among cell groups, including PDCCH blind decoding candidates and control channel elements (CCEs), to optimize the number of candidates monitored by the UE, thereby avoiding overbooking and improving control signaling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors all PDCCH candidates from both master and secondary cell groups, then control signaling coverage is improved, but processing resources are exceeded and overbooking occurs
Solution Approach 1:
The patent segments the total PDCCH candidate pool into separate master cell group (MCG) and secondary cell group (SCG) portions. The UE determines a first number of PDCCH candidates for MCG and a second number for SCG based on its total processing capability. This segmentation allows the UE to distribute monitoring tasks across both cell groups while staying within its processing resource limits, preventing overbooking while maintaining comprehensive control signaling coverage.
2Reliability
If the UE monitors more PDCCH candidates to improve control signaling performance, then reliability is improved, but battery consumption increases
Solution Approach 1:
The patent implements dynamic adaptation by allowing the UE to adjust its PDCCH monitoring strategy based on allocated resource budgets for MCG and SCG. The UE dynamically determines the number of candidates to monitor in each cell group according to its processing capabilities and network allocations, rather than uniformly monitoring all candidates. This dynamic approach optimizes battery consumption by avoiding unnecessary processing of excessive PDCCH candidates while maintaining adequate control signaling performance.
3Productivity
If the network allocates more PDCCH candidates to the UE, then control signaling efficiency is improved, but the risk of overbooking increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the UE reports its processing capabilities and monitoring status to the network. Based on this feedback, the network can adjust the allocation of PDCCH candidates between MCG and SCG to match the UE's actual processing capacity. This feedback loop prevents overbooking by ensuring that allocated candidates do not exceed what the UE can actually process, while still maximizing control signaling efficiency within feasible limits.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for allocating a number of physical downlink control channel (PDCCH) blind decoding candidates to a user equipment (UE) in dual connectivity mode. An example method generally includes allocating a resource budget among a first cell group and a second cell group, wherein the resource budget includes a number of physical downlink control channel (PDCCH) blind decoding candidates and a number of control channel elements (CCEs) supported by the UE, and monitoring for PDCCH candidates in the first cell group and second cell group in accordance with the allocated resource budget.