Uplink Control Channel Resource Mapping via EPDCCH Sets
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Solution Overview
Problem
The limited resources of the control region in wireless communication systems hinder the increase in system capacity, necessitating the use of a downlink control channel in the data region to transmit downlink control information and requiring configuration and mapping of uplink control channel resources for user equipment to perform HARQ-ACK/NACK feedback.
Innovation Solution
The method involves configuring and mapping uplink control channel resources using enhanced physical downlink control channels (EPDCCH) sets, where each set includes a number of resource-block pairs in a subframe, and transmitting information indicating the uplink control channel resource starting offset to the user equipment, allowing for effective HARQ-ACK/NACK feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If downlink control information is transmitted through a control region, then downlink control channel functionality is provided, but system capacity is limited due to restricted control region resources
Solution Approach 1:
The patent moves the downlink control channel from the traditional control region to the data region, effectively transitioning from a two-dimensional control region constraint to utilizing the broader data region space. This dimensional shift allows control information to be transmitted without being constrained by the limited control region resources, thereby increasing system capacity.
2Quantity of substance
If downlink control channel is placed in data region, then control region resource limitations are overcome, but uplink control channel resource configuration and mapping complexity increases
Solution Approach 1:
The patent pre-configures uplink control channel resources by establishing a correspondence between downlink control channel resource blocks and uplink control channel resource blocks before actual data transmission. This preliminary configuration includes defining resource block pairs and establishing mapping relationships, which simplifies the subsequent resource allocation and reduces the complexity of real-time resource management.
3Quantity of substance
If EPDCCH sets are configured with multiple resource-block pairs, then downlink control information transmission capacity is improved, but uplink control channel resource mapping complexity increases
Solution Approach 1:
The patent divides the downlink control channel resources into multiple EPDCCH sets, where each set contains one or more resource block pairs. Correspondingly, uplink control channel resources are segmented and mapped to these sets. This segmentation allows the system to handle multiple resource block pairs efficiently by treating each set as an independent unit, thereby managing the complexity of resource mapping while maintaining high downlink control information capacity.
Data Source
AI summary
The disclosure is related to configuration and mapping of uplink control channel resources. Particularly, the present disclosure relates to configuring and mapping uplink control channel resources for user equipment receiving downlink control information through a downlink control channel newly defined in a data region. Furthermore, the present disclosure relates to configuring and mapping uplink control channel resources for uplink HARQ-ACK/NACK feedback of user equipment. Herein, the uplink HARQ-ACK/NACK feedback may be performed by the user equipment in response to a downlink data channel assigned according to downlink scheduling information transmitted through such new downlink control channel.