Mobile communication system channel structure and its construction method and radio base station and mobile station

A mobile communication system and channel structure technology, applied in the field of wireless base stations and mobile stations, can solve problems such as system capacity reduction, deterioration of reception characteristics, and the inability of mobile stations to perform downlink quality detection.

Inactive Publication Date: 2003-09-17
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the channel accuracy decreases, the receiving characteristics will not deteriorate much for low-power channels such as A-DPCH, but it may cause the receiving characteristics for channels with high transmission speed and high transmission power such as HS-DSCH. Significantly deteriorated
In addition, when using this method, the mobile station cannot perform downlink quality detection
[0016] On the other hand, when the above method (2) is adopted, the increase of interference caused by sending the S-CPICH signal to each user will deteriorate the system capacity
That is, since most of the transmission power achievable by the base station is assigned to S-CPICH, the transmission power of other channels (including HS-DSCH) becomes lower, resulting in a decrease in system capacity
In addition, the more S-CPICH is assigned, the more channel codes are used, so the time code resources become insufficient
At this time, the system capacity will deteriorate due to insufficient code resources.

Method used

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  • Mobile communication system channel structure and its construction method and radio base station and mobile station
  • Mobile communication system channel structure and its construction method and radio base station and mobile station
  • Mobile communication system channel structure and its construction method and radio base station and mobile station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 2 show figure 1 The block structure of the transmitting side of the wireless base station 100 is shown. The wireless base station 100 according to the first embodiment of the present invention only sets the S-CPICH for the mobile station 201 to which the HS-DSCH has been assigned, as a pilot channel to transmit the channel signal.

[0043] figure 2 The transmission side of the wireless base station 100 shown includes: a scheduling unit 11, an A-DPCH transmission signal processing unit 12-14, an HS-DSCH transmission signal processing unit 15, an S-CPICH transmission signal processing unit 16, and an adder 17-19 , Weight generation unit 20-22, weight multiplication unit 23-25, wireless signal transmission unit 26, and transmission antenna unit 27 1 -27 n .

[0044] Next, the operation on the transmitting side of the radio base station 100 with the above-mentioned structure will be described.

[0045] figure 2 The rough cut head in represents the parallel input a...

Embodiment 2

[0054] The structure of the radio base station according to the second embodiment of the present invention is basically the same as that of the first embodiment. Figure 6 An example of the time transfer of the S-CPICH assigned by the radio base station according to the second embodiment of the present invention is given. In Embodiment 2 of the present invention, the S-CPICH is assigned during the time period when the mobile station performs downlink line quality detection every K transmission blocks. Of course, as in the first embodiment, the S-CPICH signal can be transmitted to the mobile station to which the HS-DSCH has been assigned.

[0055] As described above, according to Embodiment 2 of the present invention, since the S-CPICH is assigned only in the time period during which each mobile station performs downlink quality detection and the HS-DSCH transmission time period, it is possible to suppress code resources caused by the use of S-CPICH And insufficient power resources...

Embodiment 3

[0057] Figure 7 Shows a mobile station according to Embodiment 3 of the present invention (such as figure 1 The block structure on the receiving side of the mobile station 201). Figure 7 The receiving side of the mobile station shown includes: receiving antenna 51, wireless signal receiving unit 52, A-DPCH despreading unit 53, S-CPICH despreading unit 54, HS-DSCH despreading unit 55, channel estimation unit (A- DPCH) 56, channel estimation unit (S-CPICH) 57, A-DPCH synchronous detection unit 58, HS-DSCH synchronous detection unit 59, A-DPCH data processing unit 60, and HS-DSCH data processing unit 61.

[0058] The operation of the receiving side of the mobile station having the above structure will be described below.

[0059] Such as Figure 7 As shown, the wireless received signal received from the receiving antenna 51 is subjected to frequency conversion, waveform shaping, sampling, and quantization by the wireless signal receiving unit 52, and then is input to each of the i...

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Abstract

The invention provides a channel structure of a mobile communication system. The mobile communication system includes a wireless base station and a mobile station. The wireless base station has a transmitting antenna capable of controlling beam orientation for each mobile station in a cell. An individual companion channel used by a common channel for wireless communication, the common channel is shared by a plurality of mobile stations, and assigned to each mobile station in a given transmission unit, wherein the pilot channel used for channel estimation of the common channel and the individual companion channel is a single channel. set, that is, set as the first pilot channel and the second pilot channel respectively.

Description

Technical field [0001] The invention relates to a mobile communication system channel structure and channel formation method, a wireless base station and a mobile station, which can improve the capacity and communication quality of the mobile communication system. Background technique [0002] Wideband-code Division MultipleAccess (W-CDMA, Wideband-code Division MultipleAccess) standards are formulated in a sample set by 3GPP (3rd Generation Partnership Project), one of the organizations related to mobile wireless communication system standards, as a multi-user (mobile One of the shared channels of the station is defined as a shared channel called DSCH (Downlink Shared Channel), which is used for downlink data communication (a line from a base station to a mobile station, also called a downlink). Since DSCH is assigned to each mobile station in a given transmission unit (for example, by frame) when in use, it is expected to be used for downlink high-speed packet transmission. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/26H04L25/02H04W16/02H04W16/28H04W48/12H04W76/02
CPCH04B7/0408H04B2201/70701H04B2201/709709H04L25/0226H04L25/0228H04W16/28H04W48/12
Inventor 臼田昌史中村武宏安部田贞行
Owner NTT DOCOMO INC
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