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Collision avoidance method under CELL_FACH state, base station and terminal thereof

A conflict avoidance and base station technology, applied in wireless communication, electrical components, etc., can solve problems such as increasing system processing flow and delay, and decreasing system work efficiency

Inactive Publication Date: 2013-12-25
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above conflict avoidance process will increase the system processing flow and delay, which will lead to a decrease in system work efficiency. Therefore, it is necessary to discuss and explore the conflict avoidance method and implementation significance in the HSDPA system CELL_FACH state

Method used

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  • Collision avoidance method under CELL_FACH state, base station and terminal thereof
  • Collision avoidance method under CELL_FACH state, base station and terminal thereof
  • Collision avoidance method under CELL_FACH state, base station and terminal thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] This embodiment introduces the collision avoidance method used in the HSDPA system CELL_FACH state, and the processing performed by the base station side, such as figure 1 shown, including the following steps:

[0072] Step 110, when activating the independent HS-DPCCH transmission, the base station sends an instruction to activate the independent HS-DPCCH transmission to the user terminal through the HS-SCCH order, and the HS-SCCH order carries the signature information assigned by the base station to the user and the user temporary group Internal identification information (U-ITI), the base station assigns different U-ITIs to users with the same signature information, and needs to ensure that the signature information of users with the same U-ITI is different;

[0073] The U-ITI is used to avoid resource conflicts among users. For the specific implementation of carrying the U-ITI through the HS-SCCH order, refer to the description of Embodiment 3. The base station a...

Embodiment 2

[0085] This embodiment introduces the collision avoidance method used in the HSDPA system CELL_FACH state, and the processing performed by the terminal side, such as image 3 shown, including the following steps:

[0086] Step 210, the user terminal receives the HS-SCCH order sent by the base station, obtains the instruction for activating independent HS-DPCCH transmission, and obtains the signature information and U-ITI allocated by the base station for the user;

[0087] Step 220, the user terminal uses the signature information and the preamble scrambling code to generate a preamble sequence and send it to the base station;

[0088] Step 230, the user terminal receives the AICH sent by the base station to the terminal, obtains the U-ITI of the user set that has successfully competed for resources, compares the U-ITI of the user, and if they are the same, the user terminal prepares to send the HS-DPCCH (using AICH HS-DPCCH transmission with the indicated resources).

[008...

Embodiment 3

[0097] This embodiment introduces how to carry signature information and U-ITI through HS-SCCH order.

[0098] The HS-SCCH order is a related instruction sent by the base station to the user through the HS-SCCH channel, and it is not associated with any specific downlink data. Table 1 is a schematic diagram of bit allocation of HS-SCCH order in the existing protocol. In the prior art, the HS-SCCH order has a total of 24 bits. Among them, 16 bits are used to carry user identification information (HS-DSCH Radio Network Identifier, H-RNTI) indicating that a specific user is in the network. The other 8 bits are used to carry instruction information, among which 2 bits are used to indicate the extended instruction type, 3 bits are used to indicate the basic instruction type (the instruction type in Table 1); and the remaining 3 bits are used to indicate specific instructions content. In the existing CELL_FACH state, since multi-carrier operation is not configured, and the premis...

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Abstract

The invention discloses a collision avoidance method under a CELL_FACH state of a HSDPA system, a base station and a terminal thereof. By using the method, the base station and the terminal of the invention, time delay existing in the system is reduced and system working efficiency is increased. A base station execution method comprises the following steps that when independent HS-DPCCH transmission is activated, the base station sends an instruction of activating the independent HS-DPCCH transmission to a user terminal through a HS-SCCH command, wherein the HS-SCCH command carries signature information distributed by the base station for a user and U-ITI; the U-ITI of the users with the same signature information is different and the signature information of the users with the same U-ITI is different; after receiving a leader sequence sent by the user terminal, the base station determines one U-ITI in which the U-ITI is served as a resource competition success user set according to the signature information contained in the leader sequence; through an AICH, the U-ITI of the resource competition success user set is sent to one or more user terminals.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a collision avoidance method, a base station and a terminal in a CELL_FACH state in a high-speed downlink packet access (HSDPA) system. Background technique [0002] High Speed ​​Downlink Packet Access (HSDPA) is an enhanced technology introduced in 3GPP Release 5, which aims to increase the transmission rate of the downlink, and is an enhancement and extension of the performance of the Wideband Code Division Multiple Access (WCDMA) downlink system. HSDPA improves the transmission performance of the downlink system by introducing the downlink hybrid retransmission (HARQ) mechanism based on soft combining, the downlink scheduling based on the base station (NodeB), and the more flexible rate control and high-order modulation compared with the previous version, so that the downlink can be used in a single antenna. The maximum peak transfer rate can reach 14.4 megabits per secon...

Claims

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Application Information

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IPC IPC(8): H04W74/08
Inventor 刘俊强杨光张弛王广德常永宇
Owner ZTE CORP
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