Carrier Indication Field Segmentation for LTE-Advanced Scheduling
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Solution Overview
Problem
In wireless communication systems supporting multiple carriers, existing technologies face challenges in efficiently transmitting and receiving carrier identification information, particularly in determining whether a specific carrier belongs to uplink or downlink, and in effectively scheduling carriers for user equipment (UE) in LTE-Advanced systems.
Innovation Solution
The method involves using a carrier offset value as identification information, transmitted through a carrier indication field (CIF), to enable the UE to determine the location and type of specific carriers, with index mapping rules that differentiate between uplink and downlink carriers, and reinterpretation processes for carrier groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier identification information is transmitted using existing technologies, then the system can support multiple carriers, but it faces challenges in efficiently determining whether a specific carrier belongs to uplink or downlink and in effectively scheduling carriers for user equipment
Solution Approach 1:
The carrier indication field is segmented into a carrier indicator value and a carrier type indicator value. This segmentation allows the system to separately identify the specific carrier and its type (uplink or downlink), simplifying the determination process while maintaining support for multiple carriers and their scheduling.
Solution Approach 2:
The patent adds a new dimension to carrier identification by including a carrier type indicator value that explicitly specifies whether the carrier is for uplink or downlink. This additional dimension resolves the ambiguity in existing technologies and enables more efficient carrier scheduling without increasing overall system complexity.
2Ease of operation
If carrier identification information is transmitted without explicit carrier type indication, then the transmission format remains simple, but the receiver cannot efficiently determine whether a specific carrier belongs to uplink or downlink
Solution Approach 1:
The carrier type indicator value is included in advance within the carrier indication field, allowing the receiver to immediately determine the carrier type (uplink or downlink) without additional signaling or complex inference. This preliminary inclusion of carrier type information prevents information loss and simplifies the determination process.
3Adaptability or versatility
If existing carrier indication methods are used, then the system can transmit carrier identification information, but it lacks effective mechanisms for reinterpretation processes for carrier groups in LTE-Advanced systems
Solution Approach 1:
The carrier indication field is designed with multi-functionality to serve both individual carrier identification and carrier group scheduling. By including both carrier indicator value and carrier type indicator value, the field can effectively identify carriers within groups and support reinterpretation processes, preventing loss of carrier group identification information while maintaining adaptability for LTE-Advanced systems.
Data Source
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AI summary
The present invention relates to a method for receiving a terminal signal in a wireless communication system that supports plural component carriers, the method comprising: receiving a subframe including a plurality of OFDM symbols from a base station (BS); and receiving identification information indicative of a particular component carrier, from one or more consecutive OFDM symbols located at the front of the subframe, wherein the identification information indicative of the particular component carrier includes a carrier offset value with respect to a reference component carrier.