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Random access method, device and communication system supporting multiple transmission time intervals

A transmission time interval and random access technology, applied in the field of communication, can solve the problem of reducing service end-to-end delay and achieve the effect of reducing delay

Active Publication Date: 2020-09-15
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a shortened TTI is supported in the latest version of UE, for example, the TTI is 0.5ms or shorter, the end-to-end delay of the service will be significantly reduced

Method used

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  • Random access method, device and communication system supporting multiple transmission time intervals
  • Random access method, device and communication system supporting multiple transmission time intervals
  • Random access method, device and communication system supporting multiple transmission time intervals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] An embodiment of the present invention provides a random access method supporting multiple TTIs, which is applied to a user equipment.

[0058] figure 1 It is a schematic diagram of a random access method supporting multiple TTIs according to an embodiment of the present invention, showing the situation of the user equipment side. Such as figure 1 As shown, the random access method includes:

[0059] Step 101, the user equipment sends a preamble sequence for requesting random access to the base station through a first message; wherein the TTI type of the user equipment is indicated through the first message;

[0060] Step 102, the user equipment receives the RAR sent by the base station through the second message; where different TTI types correspond to different RARs.

[0061] figure 2 It is another schematic diagram of the random access method supporting multiple TTIs according to the embodiment of the present invention, showing the interaction between the user e...

Embodiment approach 111

[0074] The time domain resource for sending the preamble by the first user equipment is different from the time domain resource for sending the preamble by the second user equipment and is orthogonal to each other.

[0075] For example, the first user equipment uses a first time domain resource table, and the second user equipment uses a second time domain resource table; in the first time domain resource table and the second time domain resource table, The same Physical Random Access Channel (PRACH, Physical Random Access Channel) configuration index (Configuration Index) corresponds to different subframe numbers (subframe numbers).

[0076] Specifically, the traditional UE looks up the available subframe numbers in Table 5.7.1-2 in the TS 36.211 protocol according to the parameter prach-ConfigIndex configured by the base station, that is, domain resources.

[0077] Table 1: Time domain resource table used by traditional UE (same as TS 36.211 Table 5.7.1-2)

[0078]

[00...

Embodiment approach 112

[0086]The frequency domain resources used by the first user equipment to send the preamble are different from the frequency domain resources used by the second user equipment to send the preamble and are mutually orthogonal.

[0087] For example, the first user equipment uses a first parameter to select a frequency domain resource for sending the preamble, and the second user equipment uses a second parameter to select a frequency domain resource for sending the preamble.

[0088] Specifically, the traditional UE selects the frequency domain resource for sending the preamble according to the parameter prach-FreqOffset (the first parameter) configured by the base station. When the system bandwidth is greater than 1.4 MHz, new frequency domain resources can be added for UEs with short TTIs, and are orthogonal to frequency domain resources used by traditional UEs.

[0089] The base station adds a new parameter prach-FreqOffset-shorterTTI (second parameter) in the parameter PRACH-...

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Abstract

A random access method, device and communication system supporting multiple TTIs. The random access method includes: the user equipment sends a preamble sequence for requesting random access to the base station through a first message; wherein the TTI type of the user equipment is indicated through the first message; the user equipment receives the A random access response sent by the second message; where different TTI types correspond to different random access responses. Thus, the time delay of the random access procedure of the user equipment with a short TTI can be greatly reduced.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a random access method, device and communication system supporting multiple transmission time intervals (TTI, Transmission Time Interval) in a Long Term Evolution (LTE, Long Term Evolution) system. Background technique [0002] Real-time services such as automatic driving and industrial automation control that will appear in the next generation mobile communication network have high requirements on transmission delay, for example, the end-to-end delay is required to be between 1ms and 10ms. When these services are carried by the LTE system, it brings a great challenge to the delay performance of the network. In addition, for traditional Transmission Control Protocol (TCP, Transmission Control Protocol) services, reducing the end-to-end delay can significantly improve the throughput of the system. Considering these two aspects, the LTE system urgently needs to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/00H04W74/004H04W74/0833H04W74/002H04W72/51H04W72/02H04W72/0446H04W72/0453
Inventor 史玉龙徐海博周华
Owner FUJITSU LTD
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