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Base station device and adaptive modulation method

An adaptive modulation, base station technology, applied in modulation carrier systems, devices dedicated to transmitters, adjustment of transmission rates, etc., can solve problems such as insufficient, regardless of the type of transmitted data

Inactive Publication Date: 2005-12-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, even if adaptive modulation is performed in consideration of the relative moving speed of the communication partner as described above, conventional devices always determine adaptive modulation parameters based on the transmission path environment regardless of the type of data to be transmitted, even for those with relatively large Data with high QoS (Quality of Service, quality of service), for example, data with strong real-time characteristics and high importance data may not necessarily correct the adaptive modulation parameters, so from satisfying the QoS data received by the receiver From our point of view this is not enough

Method used

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  • Base station device and adaptive modulation method
  • Base station device and adaptive modulation method
  • Base station device and adaptive modulation method

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Experimental program
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Embodiment approach 1

[0028] FIG. 1 is a structural block diagram showing the structure of a base station apparatus according to Embodiment 1. Referring to FIG.

[0029] The base station apparatus 100 is composed of a memory 101 , a transmission packet formation unit 102 , a coding / modulation unit 103 , a demodulation / decoding unit 104 , a scheduler 105 , and an adaptive modulation control unit 106 . Here, for simplification of description, modules that perform transmission / reception processing on radio signals used for communication between the mobile station and the base station apparatus 100 are omitted.

[0030] The feature of this embodiment is that when the transmitted packet is actually transmitted, the CQI requested by the mobile station (UE; User Equipment, user equipment) is converted to a lower value according to QoS, and then the adaptive modulation is determined according to the converted CQI parameters and perform adaptive modulation on the transmitted packet. In this way, for exampl...

Embodiment approach 2

[0049] Fig. 7 is a structural block diagram showing the structure of base station apparatus 200 according to Embodiment 2 of the present invention. This base station apparatus has the same basic structure as the base station apparatus shown in FIG. 1, and the same structural parts are assigned the same reference numerals, so descriptions related thereto will be omitted.

[0050] The feature of this embodiment is that when the CQI conversion unit 203 converts the CQI, it converts the CQI according to the QoS arrival rate (arrival degree) of the past transmitted packets. Here, we will illustrate with an example in which the packet loss rate is taken as a specific QoS arrival rate. Packet loss rate refers to the rate of discarded packets per unit time. In addition, dropped packets refer to those packets that are not transmitted within a predetermined time or those packets that are discarded because the number of times of retransmission exceeds a predetermined number of times.

...

Embodiment approach 3

[0064] Fig. 9 is a structural block diagram showing the structure of base station apparatus 300 according to Embodiment 3 of the present invention. This base station apparatus has the same basic structure as the base station apparatus shown in FIG. 1 , and the same structural parts are assigned the same reference numerals, so descriptions related thereto will be omitted.

[0065] This embodiment is characterized in that the adaptive modulation control unit 302 converts the CQI based on the QoS urgency level measured by the QoS urgency level measurement unit 301, and executes the adaptive modulation control. For example, the QoS urgency level refers to the remaining time corresponding to the allowable transmission delay time of the sending packet, and the high QoS urgency level means that the sending packet must be sent out as soon as possible.

[0066] FIG. 10 is a structural block diagram showing the internal structure of the adaptive modulation control section 302. As shown ...

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Abstract

The UE / queue selected by the scheduler is input into the offset table (111), and the corresponding offset value is output to the CQI converter (112). Using the offset value, the CQI conversion unit (112) converts the CQI output from the demodulation / decoding unit, and outputs the converted CQI to the adaptive modulation parameter determination unit (113). Based on the transformed CQI, an adaptive modulation parameter determination section (113) determines and outputs an adaptive modulation parameter in consideration of an adaptive modulation parameter table (114). Then, the transmitted packets are adaptively modulated using these adaptive modulation parameters. In this way, fast data transmission can be realized while satisfying the QoS for sending packets.

Description

technical field [0001] The present invention relates to a base station device for performing adaptive modulation in a communication system such as HSDPA (High-Speed ​​Downlink Packet Access, High-Speed ​​Downlink Packet Access) and an adaptive modulation method used in the device. Background technique [0002] As a higher-speed IMT-2000 packet transmission system, a method called "HSDPA (High-Speed ​​Downlink Packet Access, High-Speed ​​Downlink Packet Access)" is under study, which attempts to increase the peak transmission rate of the downlink , reduce transmission delay and improve throughput, etc. As a technology that constitutes HSDPA, TR25.848 "Physical layer aspects of UTRA High Speed ​​Downlink Packet Access" of 3GPP (3rd Generation Partnership Project) discloses a technology called "AMC (Adaptive Modulation and Coding, Adaptive Modulation and Coding)" technical solution, which can be used to construct HSDPA. [0003] The AMC technology can adaptively change adapti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04B7/26H04L1/00H04L1/18H04L1/20H04L12/801H04L12/851H04L12/911H04W24/10H04W28/12H04W28/18H04W36/08H04W36/22
CPCH04B7/26H04L1/0003H04L1/0009H04L1/0017H04L1/0026H04L1/0033H04L1/18H04L1/1887H04L1/20
Inventor 有马健晋伊大知仁
Owner PANASONIC CORP