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Base station, communication terminal, transmission method, and reception method

A technology of base station and channel coding method, applied in the field of wireless communication, can solve the problem of insufficient research and achieve the effect of high-efficiency transmission

Inactive Publication Date: 2009-12-30
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the transmission of control channels to meet the above-mentioned various requirements has not been sufficiently studied

Method used

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  • Base station, communication terminal, transmission method, and reception method
  • Base station, communication terminal, transmission method, and reception method
  • Base station, communication terminal, transmission method, and reception method

Examples

Experimental program
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Embodiment 1

[0094] figure 2 Indicates the frequency band used in one embodiment of the present invention. For convenience of description, specific numerical values ​​are used, but the numerical values ​​are merely examples, and various numerical values ​​may be used. As an example of the frequency band (the entire transmission frequency band) provided to the communication system, there is a bandwidth of 20 MHz. The entire transmission band includes four frequency blocks 1 to 4, and each frequency block includes a plurality of resource blocks including one or more subcarriers. In the illustrated example, a case where a plurality of subcarriers are included in each frequency block is schematically shown. In this embodiment, as the communication bandwidth, four kinds of 5MHz, 10MHz, 15MHz, and 20MHz are prepared in advance, and user equipment (including communication terminals, mobile terminals, fixed terminals, etc.) Any one of the bandwidth to communicate. A terminal communicating wit...

Embodiment 2

[0228] The common control channel (including part 0) is information required by all users. Since the data channel is decoded based on the common control channel, error detection (CRC) coding and channel coding are performed on the common control channel. In the second embodiment of the present invention, specific examples of the error detection coding and channel coding will be described. Figure 4B is a diagram corresponding to a structure in which L1 / L2 control information (part 0) and L1 / L2 control information (parts 2a and 2b) are separately channel-coded (for each control information, there are channel coding, spreading, and data modulation Unit 41, 42-A). The following describes its alternative structure.

[0229] Figure 10A Indicates the case where part 0 and parts 2a and 2b are combined to perform error detection coding, and part 0 and parts 2a and 2b are separately channel coded. Communication terminals UE1 and UE2 combine part 0 and parts 2a and 2b to perform err...

Embodiment 3

[0235] However, from the viewpoint of improving the received signal quality of the control channel, link adaptation is desired. In the third embodiment of the present invention, transmission power control (TPC: Transmission Power Control) and adaptive modulation and coding (AMC: Adaptive Modulation and Coding) control are used as methods for performing link adaptation. Figure 11 Indicates the case where transmission power control is performed, and the quality required at the receiving end is achieved by controlling the transmission power of the downlink channel. More specifically, since the channel state is expected to be poor for user 1 which is far from the base station, the downlink channel is transmitted with a large transmission power. On the contrary, for user 2 who is closer to the base station, its channel state is expected to be better. In this case, if the transmission power of the downlink channel for user 2 is increased, the reception quality for user 2 may be go...

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Abstract

A base station includes: a scheduler which performs frequency scheduling for each sub-frame; means which prepares a control channel containing common control information mapped over a system band and specific control information mapped onto at least one RB allocated to a specific user device; and means for creating a transmission signal by time-multiplexing the common control information and the specific control information according to an instruction made by the scheduler. The common control information includes a format indicator indicating which of predetermined selection values is the number of symbols occupied by the control channel inone sub-frame. The common control information includes a specified multiplexing number or a smaller number of the unit information parts of a predetermined data size. The specified multiplexing number is contained in report information.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a base station, a communication terminal, a sending method and a receiving method used in a communication system for frequency scheduling and multi-carrier transmission. Background technique [0002] In this technical field, it is increasingly important to realize broadband wireless access that efficiently performs high-speed and large-capacity communications. In particular, from the viewpoint of effectively suppressing multipath fading in the downlink and performing high-speed and large-capacity communication, the multi-carrier method, more specifically, the Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) method has attracted much attention. attention. From the viewpoint of improving the frequency utilization rate and thereby improving the throughput, a scheme of performing frequency scheduling in the next-gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W88/08H04L1/00H04L5/00H04L27/26
CPCH04W68/00H04L1/001H04L1/007H04L1/0038H04L1/0004H04L5/0023H04W72/042H04L5/0041H04L5/0053H04L5/0044H04L5/0016H04L1/0061H04L1/0028H04L5/0094H04L1/0015H04W88/08H04L2025/03414H04L25/03343H04W72/23
Inventor 三木信彦樋口健一佐和桥卫
Owner NTT DOCOMO INC
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