Common Control Channel for Wireless UE Group Aggregation
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving low latency due to the existing structure of transmission time intervals (TTIs) in 3GPP LTE, which are not suitable for next-generation wireless communication requirements, leading to increased overhead of control signals and limited simultaneous transmission of control information for multiple UEs.
Innovation Solution
The proposed method involves mapping a common cell-radio network temporary identifier (C-RNTI) to a cyclic redundancy check (CRC) of a short PDCCH or sPDCCH in units of UE groups, allowing for simultaneous transmission of downlink and uplink control signals on a limited low-latency resource by aggregating downlink and uplink UE groups, and using a common control channel to reduce the number of bits required for CRC, thereby decreasing the overhead of control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control channels are allocated for downlink and uplink UE groups, then each group can have dedicated control information, but the overhead of control signals increases and the number of simultaneous transmissions is limited
Solution Approach 1:
The patent merges downlink and uplink control channels into a single common control channel. Multiple UE groups (both downlink and uplink) share the same control channel resources, allowing simultaneous transmission of control information to multiple UEs without increasing overall control signal overhead. This is achieved by multiplexing control information from different UE groups within the same control channel structure.
Solution Approach 2:
The common control channel is designed to serve multiple functions simultaneously - it can transmit control information for downlink UE groups, uplink UE groups, or both together. The control channel structure is universal and can accommodate different types of control information without requiring separate dedicated channels for each UE group type.
2Reliability
If separate control channels are allocated for downlink and uplink UE groups, then each group can have dedicated control information, but the number of simultaneous transmissions is limited
Solution Approach 1:
The patent merges downlink and uplink control channels into a single common control channel. Multiple UE groups (both downlink and uplink) share the same control channel resources, allowing simultaneous transmission of control information to multiple UEs without increasing overall control signal overhead. This is achieved by multiplexing control information from different UE groups within the same control channel structure.
Solution Approach 2:
The common control channel is designed to serve multiple functions simultaneously - it can transmit control information for downlink UE groups, uplink UE groups, or both together. The control channel structure is universal and can accommodate different types of control information without requiring separate dedicated channels for each UE group type.
3Quantity of substance
If a common control channel is used for multiple UE groups, then control signal overhead is reduced, but the ability to provide dedicated control information is compromised
Solution Approach 1:
The patent segments control information into different logical groups (downlink UE group control information and uplink UE group control information) while transmitting them through a common control channel. Each UE group's control information maintains its structural integrity and can be independently decoded by the corresponding UEs, even though they share the same physical transmission channel.
Solution Approach 2:
The common control channel acts as an intermediary that carries multiple types of control information simultaneously. The channel structure includes fields that can represent different UE groups and their respective control information, allowing the single channel to mediate between the need for dedicated control information and the benefit of reduced overhead.
4Quantity of substance
If a common control channel is used for multiple UE groups, then control signal overhead is reduced, but the system complexity increases
Solution Approach 1:
The patent segments control information into different logical groups (downlink UE group control information and uplink UE group control information) while transmitting them through a common control channel. Each UE group's control information maintains its structural integrity and can be independently decoded by the corresponding UEs, even though they share the same physical transmission channel.
Solution Approach 2:
The common control channel acts as an intermediary that carries multiple types of control information simultaneously. The channel structure includes fields that can represent different UE groups and their respective control information, allowing the single channel to mediate between the need for dedicated control information and the benefit of reduced overhead.
Data Source
AI summary
Provided are a method and device for transmitting control information in a wireless communication system. In particular, a base station transmits, to a terminal, an RNTI mapped to a downlink terminal group or an uplink terminal group including a terminal, and a terminal ID instructing the terminal in the downlink terminal group or the uplink terminal group. The RNTI and the terminal ID are used to set control information, and the control information includes an identification information field instructing whether scheduling information on the terminal exists, a scheduling information field for the terminals in each terminal group, and a first CRC field. The first CRC field is encoded for the scheduling information field for the terminals in each terminal group. The set control information is transmitted to the terminal.