Terminal Device Random Access Response Reception in 5G Networks
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Solution Overview
Problem
In LTE systems, terminal devices cannot detect downlink control channels from non-resident cells, limiting their ability to receive Random Access Response (RAR) information from multiple cells, which is not applicable to 5G (new radio, NR) systems.
Innovation Solution
A method for a terminal device to access a network by sending a random access preamble, receiving indication information from a network device, and selectively receiving RAR information from multiple network devices, including both resident and non-resident cells, based on identification and timing advance or load ratio criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal device only receives RAR information from the resident cell, then the device complexity is reduced and the operation is simplified, but the adaptability to 5G systems deteriorates and network access efficiency is reduced
Solution Approach 1:
The patent implements dynamic RAR reception by enabling the terminal device to adaptively select whether to receive RAR information from resident cell only or from multiple cells including non-resident cells, based on received indication information. This dynamic mechanism allows the system to transition between simplified operation mode and enhanced adaptability mode, resolving the contradiction between ease of operation and 5G adaptability.
2Productivity
If the terminal device receives RAR information from multiple network devices, then the network access efficiency is improved and adaptability is enhanced, but the device complexity increases and detection difficulty increases
Solution Approach 1:
The patent introduces indication information as an intermediary that guides the terminal device's RAR reception process. The indication information, sent by the network device, specifies which cells' RAR information the terminal should monitor, thereby simplifying the complex multi-cell reception process into a guided, manageable operation that improves access efficiency without excessively increasing device complexity.
Solution Approach 2:
The patent implements partial action by having the terminal device receive RAR information from a selected subset of cells (indicated by the indication information) rather than all possible cells. This partial reception approach optimizes the balance between improving network access efficiency through multi-cell reception and managing device complexity by limiting the reception scope to necessary cells only.
3Reliability
If the terminal device monitors downlink control channels from non-resident cells, then the ability to receive RAR information from multiple cells is improved, but the use of energy increases and the detection precision requirements increase
Solution Approach 1:
The patent applies preliminary action by having the network device send indication information before the terminal device begins monitoring downlink control channels. This advance guidance allows the terminal to pre-configure its reception parameters and only monitor specific cells indicated by the network, thereby improving RAR reception reliability while reducing energy consumption compared to blind monitoring of all possible cells.
Data Source
AI summary
A method for a terminal device to access a network, a terminal device and a network device are provided. The method includes: sending a random access preamble by a terminal device; receiving, by the terminal device, indication information sent by a first network device; and receiving, by the terminal device, random access response information sent by at least one network device according to the indication information, wherein the at least one network device comprises the first network device.