Dynamic Contention-Based PUSCH Zone Configuration for Low Latency Uplink
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting high data traffic, increased transfer rates, low latency, and energy efficiency due to resource shortages and inefficient uplink data transmission methods.
Innovation Solution
A method for dynamically configuring a Contention-based PUSCH Zone (CP zone) by defining a basic CP zone and resource blocks, allowing for the transmission of uplink data without explicit scheduling from the enhanced Node B, using control messages to inform resource changes and utilizing specific RNTIs for CRC masking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional scheduled uplink resource allocation is used, then resource management is controlled and reliable, but transmission latency increases and resource efficiency decreases
Solution Approach 1:
The patent implements dynamic CP zone configuration where the eNB can adjust the size, position, and existence of CP zones on a per-subframe basis through second control messages. This allows the system to adapt resource allocation dynamically rather than using fixed scheduled allocation, reducing latency by enabling UE to transmit immediately when CP zones are available while maintaining eNB control through dynamic reconfiguration.
Solution Approach 2:
The uplink resource is segmented into CP zones and non-CP zones within the PUSCH region. CP zones are specifically designated for low-latency transmissions where UE can autonomously select resources without scheduling requests, while non-CP zones maintain traditional scheduled allocation. This segmentation allows simultaneous operation of both transmission modes to address different latency requirements.
2Productivity
If CP zone resources are statically allocated, then resource management is simple, but resource efficiency decreases due to unnecessary resource consumption
Solution Approach 1:
The eNB dynamically adjusts CP zone configuration through second control messages sent in (N-x)th subframes to affect Nth subframes. The configuration can change the number of CPRBs, their frequency position, and the overall CP zone structure based on current traffic conditions and resource availability, optimizing resource efficiency while maintaining simple UE operation.
Solution Approach 2:
The system implements feedback mechanisms where the eNB monitors uplink traffic conditions and resource usage, then sends second control messages to adjust CP zone configurations accordingly. This closed-loop control allows the system to respond to changing conditions and optimize resource allocation efficiency without requiring complex UE-side decision-making.
3Loss of time
If dynamic CP zone configuration is implemented, then transmission latency is reduced, but control message overhead increases
Solution Approach 1:
The patent combines basic CP zone configuration (first control message) with dynamic reconfiguration (second control message) into a unified framework. The second control message builds upon the basic configuration rather than replacing it entirely, allowing efficient updates with reduced overhead. The merged approach enables dynamic adaptation while reusing existing configuration parameters to minimize message size.
Solution Approach 2:
The system uses parameter-based configuration where the second control message contains specific parameters (such as resource block offsets, CPRB counts, frequency positions) that modify the basic CP zone configuration. By changing only necessary parameters rather than transmitting complete configuration messages, the overhead is significantly reduced while still achieving dynamic reconfiguration for low-latency transmission.
Data Source
AI summary
A method for transmitting uplink (UL) data requiring low latency in a wireless communication system is disclosed. The method performed by a user equipment (UE) includes receiving a first control message for informing a basic Contention-based PUSCH (Physical Uplink Shared Channel) Zone (CP zone) allocated to each subframe from an enhanced Node B (eNB), receiving a second control message for informing changes in a CP zone allocated to a specific subframe from the eNB, and transmitting UL data to the eNB through a CPRB (Contention PUSCH Resource Block) of the changed CP zone based on the received second control message. The first control message includes basic CP zone resource information indicating resource information of the basic CP zone, and the second control message includes changed CP zone resource information indicating resource information of the changed CP zone.