Movable communication system, base station equipment and movable communication system controlling method

A technology of mobile communication system and base station equipment, which is applied in the direction of wireless communication, telephone communication, on-line telephone system, etc., and can solve the problems of lower communication quality, large amount of interference, and lower communication quality, etc.

Inactive Publication Date: 2003-03-05
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the downside, communication quality degrades when maximum transmit power is reached
[0011] In addition, the CDMA / TDMA / TDD system in which transmission power control is not performed has the disadvantage of lowering the communication quality when the amount of interference is large

Method used

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  • Movable communication system, base station equipment and movable communication system controlling method
  • Movable communication system, base station equipment and movable communication system controlling method
  • Movable communication system, base station equipment and movable communication system controlling method

Examples

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no. 1 example

[0043] A first embodiment of the present invention will be described below. The wireless access method in this embodiment is assumed to be a combination of three methods: CDMA method, TDMA method and TDD method. The following will describe this embodiment according to the situation of performing transmit power control through downlink channel transmission.

[0044] For example Figure 9 One frame configuration shown can be used in this embodiment. As mentioned above, Figure 9 An example of the CDMA / TDMA / TDD method is shown, in which one frame is composed of 15 slots, and a maximum of eight codes can be multiplexed per slot. Since the wireless access method in this embodiment is a combination of the CDMA method, the TDMA method and the TDD method, the allocation of wireless resources according to the communication traffic is described as follows.

[0045] (1) According to the TDD method, fifteen time slots are allocated between an uplink channel and a downlink channel.

[0...

no. 2 example

[0063] Hereinafter, a second embodiment of the present invention will be described. As in the first embodiment, the radio access method of the present embodiment assumes a combination of the CDMA method, the TDMA method, and the TDD method. In this embodiment, the transmission power control for transmission through the downlink channel is not performed, but the transmission power is set to different levels according to time slots or shared channels. Figure 7 An example is shown in which the transmission power is set to a different level according to a slot or a shared channel.

[0064] Figure 8 shows the relationship between transmit power and priority in the presence of multiple base stations, where the transmit power of each base station is set similar to Figure 7 Proceed as shown. As shown in 8, in base station A, among shared channels SC1 to SC3, the highest level of transmission power is set for transmission over shared channel SC1, while the lowest level of transmi...

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Abstract

In a mobile communication system, interference power from adjacent cells is effectively reduced and transmission power is limited. A transmission loss estimation unit 202 and a transmission power estimation unit 204 estimate transmission power necessary for transmission of a downstream signal. According to an upstream signal from each of plurality of mobile terminal devices to a base station, a grouping unit 206 divides a plurality of mobile terminal devices into groups sharing a plurality of wireless resources according to the estimated transmission powers. Downstream signals to be transmitted to mobile terminal devices belonging to each of the groups formed by the grouping means are transmitted simultaneously with each other. Also, priorities are set for the plurality of wireless resources and the mobile terminal devices belonging to the groups divided by the grouping unit 206 are assigned according to the set priorities. Accordingly, transmission to one of the groups requiring higher transmission power in one of cells adjacent to each other and transmission to one of the groups requiring higher transmission power in another of the cells are performed at different times, thereby reducing interference power received in each cell from the adjacent cells.

Description

technical field [0001] The present invention relates to a mobile communication system, a base station device and a method for controlling a mobile communication system, and in particular to a mobile communication system in which three methods are used: Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA) and Time Division Duplex A combination of (TDD) as an access method, and in which one frequency or a frequency with possibility of interference is used in two cells adjacent to each other, is suitable for communication by a base station device of a mobile communication system and a method of controlling the mobile communication system. Background technique [0002] In a CDMA system, a radio resource called a shared channel is defined. This shared channel is mainly used for grouping users, and the way is to share a channel by multiple users. Through this shared channel, corresponding users transmit at different times, and call setting control can be eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04B7/005H04B7/26H04J3/00H04J13/00H04W52/24H04W72/04H04W72/10
CPCH04W52/50Y02B60/50H04W52/346H04W52/10
Inventor 二方敏之文盛郁
Owner NTT DOCOMO INC
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