T-RNTI Allocation for 2-Step Random Access Latency Reduction
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Solution Overview
Problem
Current mobile communication systems face increased latency in uplink data transmission due to resource allocation scheduling, which hinders efficient data transmission and reception, especially in high-traffic scenarios.
Innovation Solution
A method is introduced to allocate a temporary radio network temporary identifier (T-RNTI) to user equipment (UE) within a 2-step random access procedure, allowing for data transmission on a contention-based physical uplink shared channel without prior resource allocation, and utilizing random values to prevent collisions between terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base station scheduling is used for resource allocation, then resource utilization is maximized, but uplink data transmission latency increases
Solution Approach 1:
The patent pre-allocates contention-based PUSCH resource blocks for uplink data transmission before the actual data needs to be sent. These resource blocks are reserved in advance for random access procedures, eliminating the need for real-time scheduling when data transmission is urgently needed, thus reducing latency while maintaining overall resource efficiency.
Solution Approach 2:
The patent segments the PUSCH resources into dedicated contention-based resource blocks separate from scheduled resources. This segmentation allows terminals to directly access pre-allocated resources for random access without going through the full scheduling process, while other resources continue to be used for scheduled transmissions, thereby resolving the contradiction between resource utilization and transmission speed.
2Reliability
If 4-step random access procedure is used, then resource allocation is controlled, but access latency increases
Solution Approach 1:
The patent merges the random access preamble transmission and uplink data transmission into a single 2-step procedure. The terminal transmits both the random access preamble and uplink data together on the contention-based PUSCH resource blocks, eliminating the need for separate scheduling requests and resource allocations, thus reducing access latency while maintaining resource control through pre-allocation.
3Productivity
If multiple terminals share the same radio resources for random access, then resource efficiency improves, but contention resolution failures increase
Solution Approach 1:
The patent introduces T-RNTI (Temporary Radio Network Temporary Identifier) as an intermediary mechanism for contention resolution. Each terminal is allocated a unique T-RNTI associated with its contention-based PUSCH resource block, allowing the base station to identify and resolve collisions between multiple terminals sharing the same resources, thereby maintaining high resource efficiency while improving contention resolution reliability.
Data Source
Figure 1~2(b)
Figure 3
Figure 4(a)~4(b)
AI summary
Provided are a method for allocating a temporary radio network temporary identifier to a terminal within a random access procedure in a wireless communication system, and an apparatus supporting the same. The method for allocating a temporary radio network temporary identifier (T-RNTI) to a user equipment (UE) within a random access procedure in a wireless communication system, includes transmitting, by the UE, a random access preamble to a base station (BS), transmitting, by the UE, a radio resource control (RRC) request message to the BS through a contention-based physical uplink shared channel (PUSCH) resource block in which uplink data can be transmitted without uplink resource allocation scheduling, and receiving, by the UE, an RRC connection setup message identified by a T-RNTI allocated to the UE in response to the RRC request message, wherein the T-RNTI is allocated on the basis of the contention-based PUSCH resource block in which the RRC request message has been transmitted.