Mobile communication system and mehtod of controlling receiving quality

A technology for mobile communication systems and reception quality, applied in the field of mobile communication systems, can solve problems such as lowering transmission efficiency and difficulty in using effective power amplifiers, and achieve the effect of improving reception quality

Inactive Publication Date: 2002-06-12
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, a new problem arises: the overhead of sending control signals for power control reduces transmission efficiency
Therefore, it is not easy to use effective power amplifier

Method used

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  • Mobile communication system and mehtod of controlling receiving quality
  • Mobile communication system and mehtod of controlling receiving quality
  • Mobile communication system and mehtod of controlling receiving quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Fig. 2A shows a mobile communication system for realizing downlink reception quality control. In the figure, reference numerals RNC, BS and MS denote a radio network controller, a base station and a mobile station, respectively. More specifically, FIG. 2A shows how the base station BS (including base stations #0-#N), mobile station MS#0, and radio network control station RNC are connected together according to Embodiment 1, and FIG. 2B shows The communication control flow according to Embodiment 1 is shown.

[0042] In Embodiment 1, the mobile station MS#0 measures the power received from surrounding base stations in order to determine which base stations to connect to in order to satisfy the desired downlink reception quality (step S1).

[0043] The mobile station MS#0 notifies the radio network control station RNC of desired base stations to which the mobile station will connect using the signal format shown in FIG. 3 (step S2). Fig. 3 shows a signal format used by ...

Embodiment 2

[0047] Fig. 4A shows another mobile communication system for realizing downlink reception quality control. The system includes a QoS (Quality of Service) agent in addition to the radio network control station RNC, the base station BS and the mobile station MS. More specifically, FIG. 4A shows how the base station BS (including base stations #0 to #N), the mobile station MS#0, the radio network control station RNC and the QoS agent are linked together according to Example 2, and FIG. 4B The communication control flow according to Example 2 is shown.

[0048] In Embodiment 2, the mobile station MS#0 notifies the QoS agent of its desired downlink reception quality and its location using the signal format shown in FIG. 5A (step S11). Fig. 5A shows a signal format used by the mobile station MS#0 for notifying a QoS proxy (=signal indicating reception quality desired by the mobile station and information on the location of the mobile station). The signal format includes a QoS prox...

Embodiment 3

[0056] FIG. 8A shows a mobile communication system for realizing uplink reception quality control. The system includes a radio network control station RNC, a base station BS, a mobile station MS and a QoS proxy. More specifically, FIG. 8A shows how the base station BS (including base stations #0 to #N), the mobile station MS#0, the radio network controller RNC, and the QoS agent are connected together according to Embodiment 3. FIG. 8B shows The communication control flow according to Embodiment 3 is shown.

[0057] In Embodiment 3, before sending information, mobile station MS#0 uses the signal format shown in FIG. Transmission power (step S41). In order to meet the quality requirements, the QoS agent selects the base stations connected to the mobile station (step S42) in such a way that the maximum transmission power of the mobile station MS#0 is not exceeded (step S42), and uses the signal format shown in FIG. The power is notified to the mobile station (step S43). Furt...

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Abstract

The present invention improves receiving quality compared to the prior art even if instantaneous control of transmission power is not executed. A mobile station MS#0 measures signal level received from surrounding base stations and determines to which base stations it is to be connected in order to satisfy a desired downlink receiving quality (step S1). The mobile station MS#0 notifies a radio network control station RNC of the desired based stations to which the mobile station is to be connected (step S2). Upon receiving the notification from the mobile station MS#0, the radio network control station RNC duplicates a downlink transmitted signal for the mobile station MS#0, if any, and transmits it to the selected base stations (step S3). The mobile station MS#0 receives signals transmitted by the base stations (step S4) and synthesizes these signals (step 5), thereby satisfying the desired downlink receiving quality.

Description

technical field [0001] The present invention relates to a mobile communication system and a method for controlling reception quality in a mobile communication system. More particularly, the present invention relates to a mobile communication system that provides a communication service from a base station to a mobile station through a wireless channel, and a method for controlling reception quality in the mobile communication system. Background technique [0002] In known mobile communication systems, the desired reception quality is obtained mainly by controlling the transmission power to compensate for momentary variations in the received signal level. [0003] FIG. 1A to FIG. 1C illustrate problems existing in using conventional transmit power control to perform reception quality control. Assume that, as shown in FIG. 1A, the reception range varies over a wide range. In this case, if the transmission power is controlled with a small change (see FIG. 1B ), the transmissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/005H04B7/02H04W52/40
CPCH04B7/022H04W52/40H04W28/24H04W48/20H04W52/04
Inventor 池田武弘冈岛一郎梅田成视
Owner NTT DOCOMO INC
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