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Communication system, communication device, and communication method

A communication device and new system technology, applied in wireless communication, multiplexing communication, frequency division multiplexing system, etc., can solve the problem of not being able to control the transmission rate adaptively, and achieve improved frequency utilization efficiency and coverage The effect achieved by the range

Active Publication Date: 2011-05-25
NTT DOCOMO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for control channels, the transmission rate cannot be adaptively controlled like data channels

Method used

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  • Communication system, communication device, and communication method
  • Communication system, communication device, and communication method
  • Communication system, communication device, and communication method

Examples

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Embodiment 1

[0031] image 3 Along with concrete numerical examples it is also indicated with figure 1 An example of the same frequency utilization method is used for comparison with the present invention. The first, second and third mobile communication service providers (operators) respectively provide mobile communication services through FDD. Each operator uses one frequency band for downlink indicated by "DL" and one frequency band for uplink indicated by "UL". Between the three frequency bands for "UL" and the three frequency bands for "DL", frequency bands (center gaps) for preventing interference between uplink and downlink are prepared. The three frequency bands for "UL", the three frequency bands for "DL", and the center gap are prepared in the band of 3.4 to 3.8 GHz.

[0032] The frequency band allocated to each operator is called basic bandwidth or system bandwidth. In the illustrated example, each operator has a basic bandwidth of 20 MHz in the uplink and 70 MHz in the dow...

Embodiment 2

[0043] As described above, when the frequency (carrier frequency) is high, there is concern that the path loss increases and the coverage of the cell decreases. For example, compared to the case of a carrier frequency of 2 GHz, the path loss increases by about 6 dB in the case of a carrier frequency of 3 GHz. On the other hand, for a data channel, a certain level of signal quality can be ensured by appropriately controlling the transmission rate. The transmission rate can be controlled by data modulation method, channel coding rate (or data size), code spreading frequency, etc. For control channels, on the other hand, such adaptive control (AMC) of the transmission rate is not suitable. Even if the transmission rate is controlled, it cannot be changed in various ways like a data channel. Therefore, in the second embodiment of the present invention, the data channel is communicated at a high frequency and the control channel is communicated at a low frequency.

[0044] Ima...

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Abstract

A communication device of a new system used in a region where both of an old system and a new system of the FDD method are used includes: a means for communication of at least a downlink data channel of the new system in a band belonging to a certain band (3.4 to 3.8 GHz); and a means for communication of at least an uplink control channel of the new system in a band belonging to a band lower than the certain band (band of 2 GHz). In other band, uplink / downlink communication is performed in the old system.

Description

technical field [0001] The present invention generally relates to the technical field of mobile communication, and in particular relates to a communication system, a communication device and a communication method utilizing broadband and high-frequency frequencies. Background technique [0002] In this technical field, 3GPP, a standardization body for W-CDMA, is studying W-CDMA and subsequent next-generation communication methods of HSDPA. Representative examples of next-generation communication systems are Long Term Evolution (LTE: Long Term Evolution) systems and IMT-advanced systems (fourth generation mobile communication systems). The IMT-advanced system (IMT-A) is also referred to as the LTE-advanced system (LTE-A). [0003] Along with the high-speed communication requirements, the system bandwidth is also widened. For example, in the downlink, a bandwidth of 5 MHz is used in the W-CDMA scheme, and a bandwidth of up to 20 MHz is used in the LTE scheme. In the success...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04J1/00H04W84/02H04W88/06
CPCH04L5/0053H04W16/14
Inventor 丹野元博佐和桥卫尾上诚蔵三木信彦岸山祥久田冈秀和
Owner NTT DOCOMO INC
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