Mobile station device in CDMA mobile communication system
A mobile communication system and mobile station technology, applied in the field of CDMA mobile communication systems, can solve the problems of long scanning time of mobile stations, congestion of control signal transmission, and weakening of related characteristics of pilot channel spreading codes.
Inactive Publication Date: 2005-07-06
NTT MOBILE COMM NETWORK INC
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[0008] However, in the conventional CDMA mobile communication system, different pilot channel spreading codes are assigned to different sectors, and thus the number of required pilot channel spreading codes increases when the number of sectors increases, and there is also a problem, that is, when the number of codes with good correlation properties is limited, the correlation properties of the pilot channel spreading codes are correspondingly weakened
[0009] In addition, there is a problem that when the number of spreading codes of the pilot channel increases, the scanning time of the mobile station becomes longer.
[0010] Another problem existing in the conventional CDMA mobile communication system is that when the number of sectors increases, the number of handovers in the sectors also increases accordingly, so that control signals need to be exchanged more frequently between the mobile station and the base station, thereby Transmission of control signals also becomes blocked
[0011] In a conventional CDMA mobile communication system, the number of sectors used is about three, but as the number of users increases, it is estimated that the number of sectors used in a future CDMA mobile communication system will increase to twelve or more, thus The above-mentioned problems related to the increase in the number of sectors are expected to become more serious
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[0042] now refer to figure 1 The first embodiment of the CDMA mobile communication mode based on the present invention is described in detail until FIG. 5 .
[0043] figure 1 The structure of the CDMA mobile communication system in the first embodiment has been described, wherein each base station 1 and 2 connected to the communication network 90 is composed of a plurality of sectors (in the first embodiment, sector 1 to sector 3), base station 1 or 2 transmits a pilot channel from sector 1 to sector 3 using a spreading code pre-assigned to each base station. exist figure 1 In , the mobile station 92 also communicates with the base station 1 . Mobile station 92 sends an uplink spreading code (code 0) to base station 1, and base station 1 sends the same downlink spreading code (code1) to mobile station 92 from sectors 2 and 3.
[0044] Figure 2 illustrates figure 1 The structure of each base station 1 or 2 in the CDMA mobile communication system is shown. As shown in Fi...
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A mobile station device in a code division multiple access mobile communication system. A CDMA mobile communication mode that increases the capacity by using a sector structure to increase the number of sectors without increasing the number of spreading codes for the pilot channel and without blocking the transmission of the control channel. A pilot channel spread by the same pilot channel spreading code is transmitted from each sector of the base station. Receive uplink signals from each mobile station on multiple sectors, use the same uplink spreading code to despread, and obtain the maximum ratio combination of despread signals. The downlink signal is spread using the same downlink spreading code, and the spread downlink signal is transmitted from a plurality of transmission sectors to each mobile station.
Description
technical field [0001] The present invention relates to a CDMA (Code Division Multiple Access) mobile communication system, the system has base stations connected to a communication network and mobile stations communicating with base stations in CDMA mode, wherein each base station has a plurality of cells for each base station partitioned sectors. More specifically, the present invention relates to a spreading code usage pattern, a sector selection pattern and a transmission power control pattern for such a CDMA mobile communication system having a sector structure. Background technique [0002] The CDMA mobile communication system is a system using the CDMA mode, which is one of the spectrum spreading modes like the radio addressing mode between the base station and the mobile station. [0003] In CDMA mode, multiple channels (mobile stations) use the same frequency, so the transmission data sequences of different channels are multiplied and multiplexed by different sprea...
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Login to View More IPC IPC(8): H04B7/08H04W16/00H04W16/02H04W16/24H04W48/12
CPCH04B7/0857H04W16/00H04W16/02H04W16/24H04W48/12H04B1/69
Inventor 中野悦宏中村武宏尾上诚藏
Owner NTT MOBILE COMM NETWORK INC