PDSCH Resource Assignment for Subsequent TTI Data Transmission
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is inefficiency in the use of PDSCH resources due to partial utilization of assigned segments and limited PDCCH capacity, leading to unused resources and potential delays in data transmission, which affects throughput.
Innovation Solution
A method where a base station assigns PDSCH segments not only for current data transmission but also includes an assignment for subsequent TTI, allowing for the transmission of DCI messages in spare capacity, thereby optimizing resource use and reducing PDCCH congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDSCH segments are assigned for current TTI data transmission, then data transmission capacity is improved, but resource utilization efficiency deteriorates due to partial utilization of assigned segments
Solution Approach 1:
The patent applies preliminary action by including a DCI message in the current TTI's PDSCH segment that pre-assigns PDSCH resources for the subsequent TTI. This allows the UE to know in advance the resource allocation for the next TTI, enabling the base station to utilize spare capacity in the current PDSCH segment for control information transmission, thereby improving overall resource utilization efficiency while maintaining data transmission capacity.
2Reliability
If PDCCH is used for control signaling transmission, then control information delivery is ensured, but PDCCH congestion occurs leading to transmission delays
Solution Approach 1:
The patent merges the control information transmission function from the PDCCH into the PDSCH segment by including a DCI message within the data channel. This combines the data transmission and control signaling functions in the same channel, reducing PDCCH congestion and eliminating the need for separate control channel resources, thereby improving reliability while reducing transmission delays.
Solution Approach 2:
The PDSCH segment is given multi-functionality by serving both as a data transmission channel and as a carrier for control information (DCI message). This universal usage of the PDSCH for both data and control purposes eliminates the bottleneck in the PDCCH, ensuring reliable control information delivery without causing congestion-related delays.
3Ease of manufacture
If PDSCH spare capacity is left unused, then current TTI data transmission is simplified, but subsequent TTI resource allocation efficiency deteriorates
Solution Approach 1:
The patent uses preliminary action by utilizing the spare capacity in the current PDSCH segment to transmit a DCI message that contains the resource allocation information for the subsequent TTI. This preliminary transmission of control information simplifies the current TTI data transmission while simultaneously improving future resource allocation efficiency, as the UE already has the allocation details before the next TTI begins.
Data Source
AI summary
Disclosed is a method and system in which a PDSCH segment assigned to a UE in a particular TTI not only carries data to the UE but also carries an assignment to the UE of a PDSCH in a subsequent TTI for carrying additional data to the UE in that subsequent TTI. Such an arrangement can help make good use of possibly otherwise unused PDSCH capacity and can help to manage PDCCH capacity in the subsequent TTI.