Method and system for random access on small cell under dual connectivity

A technology of random access and random access preamble, which is applied in the field of communication, and can solve problems such as UE random access under dual connectivity that no one has proposed

Inactive Publication Date: 2015-04-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under dual connectivity, the UE can maintain data connections with more than two base stations at the same time, but the control plane connection is only connected to the cell to which one of the base stations belongs, such as a macro cell
[0008] At present, no one has proposed a technical solution for UE to perform random access on a small cell under dual connectivity

Method used

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  • Method and system for random access on small cell under dual connectivity
  • Method and system for random access on small cell under dual connectivity
  • Method and system for random access on small cell under dual connectivity

Examples

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Embodiment 1

[0122] The application scenario of this embodiment is: under dual connectivity, base station 1 is a macro base station and has one cell, namely cell 1, base station 2 is a small cell base station, and has two cells, namely cell 3 and cell 4; among them, the control connection On the macro base station, that is, the control is connected to base station 1.

[0123] The method for performing random access on a small cell in this embodiment is as follows: Figure 4 shown, including the following steps:

[0124] Step 400: After the UE establishes a connection with the cell 1, the base station 1 to which the cell 1 belongs sends a measurement task to the UE, and receives the measurement report reported by the UE, and then performs step 401;

[0125] Step 401: Base station 1 finds that the traffic volume increases according to the measurement report, and needs to add a cell to the UE, so it sends a configuration command for adding cell 3 to the UE;

[0126] Step 402: After receivin...

Embodiment 2

[0143] The application scenario of this embodiment is: under dual connectivity, base station 1 is a macro base station and has one cell, namely cell 1, base station 2 is a small cell base station, and has two cells, namely cell 3 and cell 4; among them, the control connection On the macro base station, that is, the control is connected to base station 1.

[0144] The method for performing random access on a small cell in this embodiment is as follows: Figure 5 shown, including the following steps:

[0145] Step 500: After the UE establishes a connection with the cell 1, the base station 1 to which the cell 1 belongs sends a measurement task to the UE, and receives the measurement report reported by the UE, and then performs step 501;

[0146] Step 501: Base station 1 finds, according to the measurement report, that the traffic volume increases and needs to add a cell to the UE, so it sends a configuration command for adding cell 3 to the UE, and at the same time notifies the...

Embodiment 3

[0163] The application scenario of this embodiment is: under dual connectivity, base station 1 is a macro base station and has one cell, namely cell 1, base station 2 is a small cell base station, and has two cells, namely cell 3 and cell 4; among them, the control connection On the macro base station, that is, the control is connected to base station 1.

[0164] The method for performing random access on a small cell in this embodiment is as follows: Image 6 shown, including the following steps:

[0165] Step 600: After the UE establishes a connection with the cell 1, the base station 1 to which the cell 1 belongs sends a measurement task to the UE, and receives the measurement report reported by the UE, and then performs step 601;

[0166] Step 601: Base station 1 finds, according to the measurement report, that the traffic volume increases and needs to add a cell to the UE, so it sends a configuration command for adding cell 3 to the UE;

[0167] Step 602: After receivin...

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Abstract

Disclosed is a method for conducting random access on a small cell under dual connections. The method comprises: on a designated small cell, a user equipment (UE) sending a dedicated random access preamble code corresponding to the designated small cell to a base station to which the designated small cell belongs; and the UE receiving a random access response message sent by a base station to which a main control cell belongs in dual connections or the base station to which the designated small cell belongs. Also disclosed, at the same time, are a system for conducting random access on a small cell under dual connections, a base station, a UE and a computer storage medium.

Description

technical field [0001] The present invention relates to the field of communications, and in particular, to a method and system for random access on a small cell under dual connectivity. Background technique [0002] In a Long Term Evolution (LTE, Long Term Evolution) system, before a connected user equipment (UE, User Equipment) sends data to a base station, it needs to obtain uplink synchronization and downlink synchronization with the base station. Here, uplink synchronization is implemented by performing a random access procedure (at the same time, a transmission time advance (TA, Time Advance) is obtained), and downlink synchronization is implemented by UE measuring a certain cell. Among them, TA is mainly used to let the UE determine the data transmission time. [0003] After the UE obtains the uplink synchronization, it will start the uplink synchronization timer (TAT, Time Alignment Timer). If the UE receives the TA sent by the base station before the TAT times out, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04B7/02H04W74/08H04W48/20H04W74/0833H04W88/06
Inventor 陈中明
Owner ZTE CORP
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