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User terminal, wireless base station and wireless communication method

A technology for user terminals and wireless base stations, which is used in wireless communication, signaling distribution, and multiple use of transmission paths.

Inactive Publication Date: 2017-10-13
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It is assumed that in the unlicensed band, different operators or non-operators operate without synchronization, coordination or cooperation, etc., which may cause greater mutual interference compared with the licensed band

Method used

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  • User terminal, wireless base station and wireless communication method
  • User terminal, wireless base station and wireless communication method
  • User terminal, wireless base station and wireless communication method

Examples

Experimental program
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Embodiment Construction

[0036] figure 1 It is an explanatory diagram of carrier aggregation (CA). like figure 1 As shown, in the CA of the conventional system (until LTE Rel.12), a maximum of five component carriers (CCs) (CC#1 to CC# 5). That is, in carrier aggregation up to LTE Rel.12, the number of CCs that can be configured per user terminal (UE: User Equipment) is limited to a maximum of five.

[0037] On the other hand, in the further successor system of LTE (for example, LTE Rel.13 and later), the expansion of setting six or more CCs (cells) by relaxing the restriction on the number of CCs that can be set for each user terminal is considered. Carrier aggregation (CAenhancement). For example, if figure 1 As shown, when 32 CCs (CC#1 to CC#32) are bundled, a maximum bandwidth of 640 MHz can be secured. In this way, it is expected that more flexible and high-speed wireless communication will be realized by expanding the number of CCs that can be set to user terminals.

[0038] In addition, ...

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Abstract

In order to suitably carry out communication even in the case of expanding the carrier aggregation (CC) number configurable in the user terminal to beyond the already existing system and / or the case in which CA is performed using unlicensed CCs, this user terminal, which communicates with a wireless base station using carrier aggregation of multiple CCs, comprises a transmitting unit which transmits a UL signal over the CCs, and a control unit which controls transmission operations in the transmitting unit, wherein, when at least a first CC corresponding to the primary CC in the already existing system and a third CC different from the first CC and from a second CC corresponding to a secondary CC in the already existing system are configured as the multiple CCs, the control unit applies, to the third CC, random access operations that are different from those applied to the first and the second CCs.

Description

technical field [0001] The invention relates to a user terminal, a wireless base station and a wireless communication method in the next generation mobile communication system. Background technique [0002] In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE: Long Term Evolution) is standardized for the purpose of further increasing high-speed data rate, low delay, etc. (Non-Patent Document 1). Furthermore, for the purpose of further widening and speeding up from LTE, an LTE successor system called LTE Advanced (also called LTE-A) is being studied and standardized as LTE Rel. 10-12. [0003] The system band of LTE Rel. 10-12 includes at least one component carrier (CC: Component Carrier) having the system band of the LTE system as a unit. In this way, a technique for increasing broadband by aggregating a plurality of CCs is called carrier aggregation (CA: Carrier Aggregation). In addition, in LTE Rel.12, dual connectivity (DC: Dual Conn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W74/08
CPCH04W74/006H04W74/0833H04L5/0023H04L5/0044H04L5/0053H04L5/0082H04L5/0091H04L5/001H04W72/51H04W72/21H04W72/02H04W74/0866
Inventor 原田浩树武田一树武田和晃内野彻永田聪
Owner NTT DOCOMO INC