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Communication system, base station, and communication terminal

a communication system and base station technology, applied in the field of radio communication technology, can solve problems such as collision risk, and achieve the effect of maintaining reliability and communication ra

Pending Publication Date: 2021-07-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention prevents collisions between base stations that provide dual connectivity to a communication terminal, which helps maintain reliable communication and high communication rates. Additionally, it ensures consistency in the transmission timing of the communication terminal and the reception timing of the base station, further enhancing the reliability and communication rates.

Problems solved by technology

The RACH involves a collision risk.

Method used

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  • Communication system, base station, and communication terminal
  • Communication system, base station, and communication terminal
  • Communication system, base station, and communication terminal

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

The First Embodiment

[0113]FIG. 2 is a block diagram showing an overall configuration of an LTE communication system 200 which is under discussion of 3GPP. FIG. 2 is described here. A radio access network is referred to as an evolved universal terrestrial radio access network (E-UTRAN) 201. A user equipment device (hereinafter, referred to as a “user equipment (UE)”) 202 that is a communication terminal device is capable of radio communication with a base station device (hereinafter, referred to as a “base station (E-UTRAN Node B: eNB)”) 203 and transmits and receives signals through radio communication.

[0114]Here, the “communication terminal device” covers not only a user equipment device such as a mobile phone terminal device, but also an unmovable device such as a sensor. In the following description, the “communication terminal device” may be simply referred to as a “communication terminal”.

[0115]The E-UTRAN is composed of one or a plurality of base stations 203, provided that a ...

second embodiment

The Second Embodiment

[0180]In switching between the BWPs in the UE, the base station includes information on a use BWP in an uplink scheduling grant to notify the UE of the information. The UE switches between the use BWPs in the uplink using the information to perform uplink transmission. The UE may be provided with a predetermined time, and switch between the use BWPs during the predetermined time. The predetermined time may be, for example, the time until the uplink transmission frequency in the UE is stabilized, or determined using another method.

[0181]Such a method causes the following problem. Specifically, the base station does not recognize the predetermined time in the UE. This causes inconsistency between the transmission timing of the UE and the reception timing of the base station in the communication between the UE and the base station before and after switching between the BWPs. This results in problems of decrease in the reliability and the communication rate in the c...

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Abstract

Provided is a technology that can maintain the reliability and the transmission rate in the communication. A communication system includes a communication terminal, and a first base station and a second base station that are configured to perform radio communication with the communication terminal. The first base station notifies the second base station of information on a numerology to be used for communication between the first base station and the communication terminal when the first base station and the second base station provide the communication terminal with dual connectivity using a same frequency band (Steps ST1501 and ST1502).

Description

TECHNICAL FIELD[0001]The present invention relates to a radio communication technology.BACKGROUND ART[0002]The 3rd generation partnership project (3GPP), the standard organization regarding the mobile communication system, is studying communication systems referred to as long term evolution (LTE) regarding radio sections and system architecture evolution (SAE) regarding the overall system configuration including a core network and a radio access network which is hereinafter collectively referred to as a network as well (for example, see Non-Patent Documents 1 to 5). This communication system is also referred to as 3.9 generation (3.9 G) system.[0003]As the access scheme of the LTE, orthogonal frequency division multiplexing (OFDM) is used in a downlink direction and single carrier frequency division multiple access (SC-FDMA) is used in an uplink direction. Further, differently from the wideband code division multiple access (W-CDMA), circuit switching is not provided but a packet co...

Claims

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Application Information

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IPC IPC(8): H04W76/15H04W72/04
CPCH04W76/15H04W92/20H04W72/0453H04W76/16H04L5/001H04L5/0053H04L5/0023
Inventor ONAKA, YASUHIROSHIMODA, TADAHIROMOCHIZUKI, MITSURUSUZUKI, KUNIYUKI
Owner MITSUBISHI ELECTRIC CORP