Mobile communication system, base station device, user device, and method

A mobile communication system and user device technology, applied in the field of mobile communication systems, can solve problems such as unsatisfactory transmission, and achieve the effects of improving reception quality and transmission efficiency

Inactive Publication Date: 2011-01-26
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the viewpoint of transmission efficiency, it is not ideal to divide 1-bit information such as ACK / NACK into an in-phase component (I-ch) and a quadrature component (Q-ch) for transmission.

Method used

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  • Mobile communication system, base station device, user device, and method
  • Mobile communication system, base station device, user device, and method
  • Mobile communication system, base station device, user device, and method

Examples

Experimental program
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Embodiment 1

[0081]

[0082] Image 6 It is a flowchart showing an example of operation of an embodiment of the present invention. In step S1, the base station performs scheduling, and establishes a radio resource allocation plan for downlink and uplink. How to allocate radio resources is indicated by downlink scheduling information for downlink and uplink scheduling information (uplink scheduling grant) for uplink. Downlink and uplink scheduling information is contained in a physical downlink control channel (PDCCH).

[0083]In this embodiment, a mobile communication system using the SC-FDMA scheme for uplink is used. Therefore, when a plurality of resource blocks are allocated to one user, scheduling is restricted so that the plurality of resource blocks occupy a continuous frequency band. When using a multi-carrier scheme such as the OFDM scheme, such restrictions are not required.

[0084] In step S2, a downlink control signal including at least PCFICH and PDCCH and a physical do...

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Abstract

A base station device comprises a means for preparing PHICHs, a means for mapping, according to a predetermined mapping table, each of the PHICHs of the number of user multiplexes to an I-channel or a Q-channel, and a means for notifying each of the users of a PHICH. A user device comprises a means for demodulating a downlink control signal including the allocation information of uplink radio resources, a means for transmitting, according to the allocation information, a shared data channel by using an uplink, and a means for retrieving a PHICH indicating necessity or unnecessity of retransmission of the shared data channel from the downlink control signal according to the predetermined mapping table. The mapping table indicates that when the number of user multiplexes is a predetermined number or less, a PHICH is made to be corresponding to only the I-channel or the Q-channel and when the number of user multiplexes is greater than the predetermined number, the PHICH is made to be corresponding to the I-channel and the Q-channel.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a mobile communication system, base station device, user device and method using the next generation mobile communication technology. Background technique [0002] In this technical field, a so-called third-generation successor mobile communication system is being studied by 3GPP, a standardization body of the Wideband Code Division Multiple Access (W-CDMA) system. In particular, studies on Long Term Evolution (LTE: Long Term Evolution) are rapidly advancing as successors to W-CDMA, High Speed ​​Downlink Packet Access (HSDPA), and High Speed ​​Uplink Packet Access (HSUPA). . The downlink radio access scheme in LTE is an Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) scheme. For the uplink, a single-carrier frequency division multiple access (SC-FDMA: Single-Carrier Frequency Division Multiple Access) scheme is ...

Claims

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Application Information

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IPC IPC(8): H04J11/00
CPCH04L1/1607H04L1/1861H04L27/2608H04L5/0053H04L27/34H04L5/0055H04L27/3405H04W72/121
Inventor 三木信彦佐和桥卫樋口健一
Owner NTT DOCOMO INC
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