PDCCH Resource Allocation for Sub-Band Full Duplex Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in handling interference, such as self-interference and cross-link interference, particularly in sub-band based full duplex operations, which limit uplink and downlink transmission opportunities and pose difficulties in accommodating asymmetric traffic.
Innovation Solution
Enhanced resource allocation methods for physical downlink control channels (PDCCH) are implemented, allowing for sub-band based full duplex operation by configuring one sub-band for uplink traffic and another for downlink traffic, with specific RB offsets applied to subsets of RB groups to optimize resource allocation and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If time division duplex (TDD) is used to avoid interference, then interference between uplink and downlink is reduced, but uplink and downlink transmission opportunities are limited
Solution Approach 1:
The carrier bandwidth is divided into multiple sub-bands, with different sub-bands allocated for uplink and downlink transmissions simultaneously. This segmentation allows full duplex operation by separating frequency resources, enabling concurrent UL/DL transmissions while avoiding interference through frequency isolation.
Solution Approach 2:
The system transitions from time-division multiplexing (TDD) to frequency-division multiplexing within the same time slot by introducing sub-band based full duplex operation. This dimensional change from time to frequency domain enables simultaneous UL/DL transmissions.
2Loss of time
If frequency division duplexing (FDD) with simultaneous reception and transmission is implemented, then latency is reduced, but self-interference occurs
Solution Approach 1:
Different sub-bands within the carrier are assigned different qualities/functions - some sub-bands are designated for uplink while others are for downlink. This local differentiation of frequency resources allows simultaneous UL/DL transmission while minimizing self-interference through frequency separation.
Solution Approach 2:
The sub-band allocation acts as an intermediary mechanism that separates uplink and downlink transmissions in the frequency domain. By introducing this frequency-based intermediary, the system achieves full duplex operation with reduced self-interference compared to traditional FDD.
3Adaptability or versatility
If sub-band based full duplex operation is implemented, then resource utilization flexibility is enhanced, but interference management complexity increases
Solution Approach 1:
The system dynamically configures sub-band allocations for uplink and downlink based on traffic conditions and interference levels. This dynamic resource allocation allows the network to adapt to varying traffic asymmetry while managing interference through flexible sub-band assignment, balancing versatility and complexity.
Data Source
AI summary
Various aspects of the present disclosure relate to a user equipment (UE), a base station, and methods that provide wireless communication in a full duplex bandwidth part. The UE includes a memory and a processor communicatively coupled to the memory and configured to cause the UE to receive a control resource set (CORESET) configuration that includes information of resource block (RB) offset(s) and of RBs allocated to a CORESET. Each RB offset corresponds to a respective subset of groups of a first number of RBs from among a larger set of groups of the first number of RBs of a downlink (DL) bandwidth part (BWP). The processor is further configured to cause the UE to receive a physical downlink control channel (PDCCH) based on the plurality of RBs allocated to the CORESET and to receive the PDCCH based on the plurality of RBs allocated to the CORESET.