Short TTI Control Channel Resource Determination
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Solution Overview
Problem
Current mobile communication systems lack a solution for determining and mapping a control channel resource in a short Transmission Time Interval (TTI), which is essential for supporting diverse services and increasing network capacity as mobile traffic grows exponentially.
Innovation Solution
A method and apparatus for determining a channel resource and mapping to a resource in a Long Term Evolution (LTE) system, where user equipment and base stations use higher-layer signaling or bit information from the legacy control region to identify and allocate resources for control channels within a short TTI, allowing flexible configuration of uplink and downlink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a short TTI is used to reduce network delay and support diverse services, then the network capacity and service diversity are improved, but there is no existing solution for determining and mapping control channel resources in the short TTI
Solution Approach 1:
The patent applies the copying principle by reusing the resource determination methods from legacy LTE systems (Frame Structure Type 1 and Type 2) for short TTI control channels. The base station and user equipment use existing higher-layer signaling mechanisms and bit information from legacy control regions to determine control channel resources in short TTIs, rather than designing entirely new resource allocation methods. This allows short TTI operations to benefit from proven legacy solutions while adapting to the shortened time interval requirements.
2Loss of time
If the control region is limited to some sub-band in the system bandwidth for short TTI, then the transmission time interval is reduced, but the transmission bandwidth of the control channel becomes uncertain
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure and notify the user equipment of the control region resource set through higher-layer signaling before short TTI transmissions occur. The resource set, which defines the frequency resources for control channels in the short TTI, is determined in advance and communicated to the user equipment using existing signaling mechanisms. This preliminary configuration ensures that both the base station and user equipment have consistent knowledge of control channel bandwidth and location before actual data transmission begins, eliminating uncertainty about transmission bandwidth.
3Adaptability or versatility
If flexible configuration of uplink and downlink resources is implemented to support diverse services, then service diversity and network capacity are improved, but the resource allocation complexity increases
Solution Approach 1:
The patent applies the universality principle by using a unified resource determination approach that works across different service types and TTI configurations. The same higher-layer signaling mechanisms and resource set definitions are used whether the system is operating with long TTIs, short TTIs, various uplink-downlink configurations, or different service requirements. This universal method simplifies the overall system complexity by providing a single framework that adapts to diverse services rather than requiring separate complex allocation schemes for each service type.
Data Source
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AI summary
Disclosed are a method and apparatus for channel resource determining and resource mapping, used for enabling a user equipment to be able to determine a resource position used by a control channel of the user equipment in a resource set used by a control region of a short TTI. The method for channel resource determining provided in the present application comprises: a user equipment determining a resource set used by a control region of a short transmission time interval; and the user equipment determining a resource position used by a control channel of the user equipment in the resource set.