Parallel Data Random Access Control in LTE User Equipment
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Solution Overview
Problem
The current random access procedure in LTE systems faces contention issues between uplink data transmission and random access procedures, especially when uplink carriers pass through different paths, leading to timing advance mismatches and potential interference.
Innovation Solution
The method involves controlling the transmission of random access sequences and other uplink transmissions to avoid contention by prioritizing the random access sequence transmission lower than or higher than the priority of PUCCH and PUSCH transmissions, allowing for successive or simultaneous transmission under power-limited conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the user equipment sends random access sequences selected by the user equipment to a network side over a PRACH, then the random access procedure can be initiated, but contention may occur when multiple user equipments send the same sequence over the same resource
Solution Approach 1:
The random access sequences are divided into two groups (Group A and Group B) based on the size of the message to be sent and the downlink path loss. User equipment selects from appropriate groups, segmenting the sequence space to reduce contention and improve success rate while maintaining fast access initiation.
Solution Approach 2:
Instead of having the network assign dedicated sequences (non-contention based), the invention allows user equipment to autonomously select sequences from public resources (contention-based), inverting the traditional assignment approach to enable faster random access initiation at the cost of potential contention.
2Reliability
If the user equipment performs uplink data transmission with high power, then the transmission quality is improved, but the total power may exceed the maximum power transmission capability of the user equipment
Solution Approach 1:
The invention dynamically adjusts transmission power parameters based on the priority of uplink channels. When multiple channels compete for power, the system changes power allocation parameters to ensure high-priority channels (PUCCH, then PUSCH with UCI, then PUSCH without UCI) receive sufficient power while staying within maximum power constraints, thereby maintaining transmission quality without violating power limitations.
3Adaptability or versatility
If the uplink carriers pass through different paths, then the system can support diverse transmission scenarios, but timing advance mismatches occur leading to interference
Solution Approach 1:
The network side performs timing advance adjustment in advance through the random access procedure before normal uplink data transmission begins. By pre-synchronizing the timing advance for each uplink carrier, the system enables diverse transmission scenarios through carrier aggregation while preventing timing mismatch interference from occurring during actual data transmission.
Data Source
Figure 1~3
AI summary
A method for ensuring parallel data random access and a user equipment are provided, which relate to the field of communications technologies. An embodiment of the present invention includes: controlling a random access sequence transmitted by a user equipment through a physical random access channel PRACH not to be sent with other uplink transmission in the same subframe; or, when a random access sequence transmitted by a user equipment through a PRACH is sent with other uplink transmission in the same subframe, controlling a priority of transmission power of the PRACH and a priority of transmission power of an uplink channel over which the other uplink transmission is performed, when power is limited. In the embodiment, it is implemented that the random access sequence and the other uplink transmission are controlled to be successively transmitted, or it is implemented that the random access sequence and the other uplink transmission are controlled to be simultaneously transmitted, which avoids contention between uplink transmission and a random access procedure in a parallel data random access procedure.