RRC Connection Request Beam Mapping for LTE Contention Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the random access procedure faces challenges in uplink synchronization and contention between terminals, leading to decoding performance issues due to the lack of efficient beam management and resource allocation.
Innovation Solution
A method where a terminal receives information about base station beam indices and their mapping to uplink reference signal ports, selects a preferred beam index based on received signal quality, and transmits an RRC connection request message indicating this index, thereby reducing contention and improving decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals use the same beam for transmission during random access procedure, then transmission simplicity is maintained, but contention between terminals increases and decoding performance deteriorates
Solution Approach 1:
The patent segments the transmission resources by dividing them into multiple beams. Each terminal is assigned to transmit RRC connection request messages through different beams, which segments the shared transmission medium into distinct spatial channels. This segmentation reduces contention between terminals while maintaining operational simplicity, as terminals follow beam assignment instructions without complex decision-making.
Solution Approach 2:
The patent introduces a spatial dimension (beam dimension) to the random access procedure. Instead of terminals competing in a single shared channel, the system adds beam diversity as another dimension for resource allocation. Terminals transmit on different beams corresponding to their preferred beam indices, transforming a one-dimensional contention problem into a multi-dimensional resource allocation solution that improves decoding performance.
2Productivity
If multiple terminals transmit simultaneously through the same beam, then resource utilization is maximized, but contention resolution becomes difficult and message reception reliability decreases
Solution Approach 1:
The patent segments the shared transmission resource into multiple beam-specific channels. By assigning terminals to different beams based on their preferred beam indices, the system divides the crowded transmission medium into separate spatial lanes. This maintains high resource utilization across the system while ensuring reliable message reception within each beam segment, as fewer terminals contend for each beam resource.
Solution Approach 2:
The patent applies local quality by optimizing transmission characteristics for each specific beam. Each beam is treated as a distinct transmission channel with its own quality characteristics. Terminals transmit through beams matched to their preferred directions, ensuring that each transmission occurs in an optimized local environment rather than competing in a uniform shared channel, thereby improving reception reliability.
3Device complexity
If beam management information is not provided to terminals, then system complexity is reduced, but terminals cannot select optimal beams for transmission
Solution Approach 1:
The patent implements preliminary action by providing beam management information to terminals before the random access procedure begins. The base station pre-configures beam indices and their corresponding uplink reference signal port mappings, so terminals have the necessary information ready to select optimal beams. This preliminary provision of information enables reliable beam-based transmission without adding complex real-time decision-making requirements during the actual access procedure.
Solution Approach 2:
The patent introduces beam index information as an intermediary that bridges the gap between simple terminal operation and optimal transmission quality. Rather than requiring terminals to perform complex beam selection algorithms, the base station provides beam index mappings that act as intermediaries, guiding terminals to select appropriate beams based on pre-configured information. This intermediary mechanism maintains system simplicity while enabling reliable beam-based transmission.
Data Source
AI summary
A method by which a terminal transmits an RRC connection request in a wireless communication system can comprise the steps of: receiving, from a base station, information of the base station beam index; receiving information on a mapping relationship between the base station beam index and an uplink reference signal port; selecting a preferred base station beam index on the basis of the information of the base station beam index; and transmitting an RRC connection request message on the basis of the information on a mapping relationship by using the uplink reference signal port corresponding to the selected base station beam index.