5G NR Control Channel Location Indication via Broadcast Signaling
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Solution Overview
Problem
The existing LTE system lacks a defined technical solution for indicating the time-frequency location of a control channel to terminal devices in future 5G NR systems or evolved LTE systems, leading to high signaling overheads due to multiple configuration schemes for the control channel in one subframe.
Innovation Solution
A method and device are provided to indicate the time-frequency location of a control channel to terminal devices in 5G NR or future evolved LTE systems, where a network device determines the time-domain location of the control channel based on the time-domain location of a broadcast channel, reducing the need for explicit signaling of control channel locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing LTE system's technical solution for indicating control channel time-frequency location is used in 5G NR or future evolved LTE systems, then the control channel can be indicated to terminal devices, but the signaling overheads of broadcast information become relatively high due to multiple configuration schemes for the control channel in one subframe
Solution Approach 1:
The patent extracts the time-domain location indication from the broadcast information by using a pre-defined correspondence between broadcast channel time-domain locations and control channel time-domain locations. This separation removes the need to explicitly signal control channel time-domain location in broadcast information, thereby reducing signaling overhead while maintaining the capability to indicate control channel locations to terminal devices.
Solution Approach 2:
The terminal device determines the control channel time-domain location by itself based on the detected broadcast channel time-domain location and a pre-configured correspondence. This self-determination mechanism eliminates the need for the network to explicitly signal the control channel location, reducing broadcast information overhead while enabling the terminal to autonomously acquire control channel location information.
2Adaptability or versatility
If multiple configuration schemes for the control channel are supported in one subframe, then the system flexibility and adaptability are improved, but the signaling overheads of broadcast information increase
Solution Approach 1:
The patent segments the control channel configuration into multiple possible time-domain location schemes, where each scheme corresponds to a specific time-domain location of the broadcast channel. This segmentation allows the system to support multiple configuration schemes while using a compact indication method (broadcast channel location) to implicitly convey control channel location, thereby maintaining flexibility without proportionally increasing signaling overhead.
Solution Approach 2:
The broadcast channel time-domain location serves a dual function: it indicates both the broadcast channel's own location and, through a pre-defined correspondence, the control channel's time-domain location. This multi-functionality allows the system to support multiple control channel configuration schemes while using the same broadcast channel location indication mechanism, avoiding additional signaling overhead for each configuration scheme.
Data Source
AI summary
A control information sending/receiving method and device are provided, to implement indicating a time-frequency location of a control channel to a terminal device in a 5G NR system or a future evolved LTE system. The method includes: receiving, by a terminal device, broadcast information; determining, from at least two predefined time-domain locations, a time-domain location of a broadcast channel carrying the broadcast information; determining a time-domain location of a control channel based on the time-domain location of the broadcast channel; and performing control channel detection in the determined time-domain location of the control channel.