Fixed Device Random Access Optimization in LTE Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Random Access mechanisms in 3GPP LTE networks are inefficient for supporting fixed M2M devices due to reduced randomness of communications and varying access latency compared to mobile devices, leading to suboptimal performance and battery power consumption.
Innovation Solution
The proposed solution involves altering the frequency of adjusting transmit power and timing information for fixed devices in mobile broadband networks, allowing them to synchronize with base transceiver stations less frequently, and restricting random access to specific slots to minimize collisions and conserve battery power, while using dirty-paper coding techniques for contention resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current Random Access mechanisms in 3GPP LTE Rel. 8+ are used for fixed devices, then mobile device support is optimized, but fixed device performance is inefficient due to reduced randomness and varying access latency
Solution Approach 1:
The patent applies local quality by creating device-type-specific random access mechanisms. Fixed devices use deterministic access with scheduled uplink transmissions and pre-configured resources, while mobile devices continue using random access. This localized optimization tailors the access method to the specific characteristics of each device type, resolving the contradiction between mobile optimization and fixed device adaptability.
Solution Approach 2:
The system dynamically adapts the random access mechanism based on device type. Fixed devices transition from random access to deterministic scheduled access, while mobile devices maintain random access. The network dynamically allocates uplink resources and adjusts timing configurations based on whether a device is fixed or mobile, enabling the system to adapt to different device characteristics and resolve the versatility issue.
2Measurement precision
If fixed devices adjust transmit power and timing information frequently, then synchronization accuracy is improved, but battery power consumption increases
Solution Approach 1:
Fixed devices perform transmit power adjustment and timing information updates periodically rather than continuously. The network configures fixed devices with specific uplink transmission occasions where these adjustments occur, and devices remain in a low-power state between these periodic updates. This periodic action maintains necessary synchronization accuracy while dramatically reducing battery power consumption for fixed devices.
Solution Approach 2:
Fixed devices use pre-configured uplink resources and deterministic transmission patterns to self-manage their synchronization without requiring frequent network interactions. The initial configuration provides timing and power parameters that devices can use autonomously for extended periods, reducing the need for energy-consuming re-synchronization events and enabling long-term autonomous operation.
3Reliability
If fixed devices use random access channel with high randomness, then collision probability is reduced, but access latency increases due to varying requirements
Solution Approach 1:
The network performs preliminary configuration of fixed devices with dedicated uplink resources, timing information, and power parameters before actual data transmission. This preliminary setup includes allocating specific random access slots and configuring deterministic transmission patterns, allowing fixed devices to bypass the collision-prone random access phase and proceed directly to scheduled transmissions, thereby reducing access latency while maintaining high reliability.
Solution Approach 2:
The patent segments the random access procedure into device-type-specific paths. Fixed devices are separated from mobile devices in the access procedure, with fixed devices using deterministic scheduled access in dedicated time slots while mobile devices use traditional random access. This segmentation eliminates collisions between device types and allows optimized latency performance for fixed devices with predictable access patterns.
Data Source
AI summary
Briefly, in accordance with one or more embodiments, a fixed device performs a cell search to search for one or more cells on a network and determines a transmit power level to communicate with one of the cells of the network. The fixed device sets a frequency of updating the transmit power level for communication with a cell on the network, wherein the frequency of updating the transmit power level is reduced for the fixed device with respect to a mobile device.