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

A terminal device and base station technology, applied in the direction of transmission path separation device, frequency division multiplexing system, orthogonal multiplexing system, etc., can solve the problem of unable to allocate CCE to PDCCH

Active Publication Date: 2013-03-20
SUN PATENT TRUST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, when the UE-SS for the next PDCCH (CCE aggregation number = 1) is CCE4 to CCE9, CCEs cannot be assigned to the PDCCH as described above.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0130] [Outline of Communication System]

[0131] The communication system of the present embodiment includes a base station 100 and a terminal 200 . The base station 100 is an LTE-A base station, and the terminal 200 is an LTE-A terminal.

[0132] In the communication system of the present embodiment, allocation control information is transmitted from the base station 100 to the terminal 200 using the PDCCH and the R-PDCCH, the PDCCH uses the CRS which is a common reference signal that all terminals can receive, and the R-PDCCH uses the CRS or the CRS for each terminal. DM-RS of the dedicated reference signal.

[0133] Figure 4 The main components of the base station 100 according to the present embodiment are shown. exist Figure 4 In the illustrated base station 100, the search interval setting unit 103 configures a search interval having a plurality of DCI assignment area candidates in the PDCCH region and the R-PDCCH region, and the assignment unit 106 assigns assignme...

Embodiment approach 2

[0237] In Embodiment 1, the case where the terminal using the CRS and the terminal using the DM-RS coexist in the R-PDCCH region has been described. On the other hand, in the present embodiment, the case where the reference signal used by each terminal in the R-PDCCH region is fixedly set will be described.

[0238] Hereinafter, the setting methods 1 to 3 of the search area according to the present embodiment will be specifically described.

[0239] In addition, the basic structures of the base station and the terminal in this embodiment are the same as those in Embodiment 1, and therefore are cited Image 6 and Figure 8 Be explained.

[0240] In addition, in the following description, as in the first embodiment, as the C-SS, a total of 6 candidate DCI allocation areas with 4 candidates (16CCE) for the CCE aggregation number 4 and 2 candidates (16CCE) for the CCE aggregation number 8 are set as the C-SS (ie, blind decoding region candidates). In addition, as the UE-SS, 6 ...

Embodiment approach 3

[0280] In the present embodiment, a case where search intervals are set for each DCI format will be described.

[0281] In addition, the basic structures of the base station and the terminal in this embodiment are the same as those in Embodiment 1, and therefore are cited Image 6 and Figure 8 Be explained.

[0282] In addition, in the following description, as in the first embodiment, as the C-SS, a total of 6 candidate DCI allocation areas with 4 candidates (16CCE) for the CCE aggregation number 4 and 2 candidates (16CCE) for the CCE aggregation number 8 are set as the C-SS (ie, blind decoding region candidates). In addition, as the UE-SS, 6 candidates (6CCE), 6 candidates (12CCE), 2 candidates (8CCE), and 2 candidates (16CCE) corresponding to the CCE aggregation numbers of 1, 2, 4, and 8, respectively, are configured, totaling 16 Candidate DCI allocation regions (ie blind decoding region candidates). That is, a search interval (C-SS and UE-SS) composed of a total of 22...

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Abstract

Disclosed is a base station device which does not cause a decrease in system throughput and can guarantee the desired reception quality at a terminal even when the DCI directed toward a terminal connected to the base station is mapped to both a PDCCH region and an R-PDCCH region. In this device, a search space setting unit (103) sets a search space, which has a plurality of allocation candidates, in the PDCCH region and the R-PDCCH region. An allocation unit (106) allocates control information to a resource in one allocation candidate from among a plurality of allocation candidates in the search space. At this time, the ratio of the number of allocation candidates in the R-PDCCH region with respect to the number of allocation candidates in the PDCCH region in the search space set for a terminal using DM-RS in the R-PDCCH region is equal to or greater than the ratio of the number of allocation candidates in the R-PDCCH region with respect to the number of allocation candidates in the PDCCH region in the search space set for a terminal using CRS in the R-PDCCH region.

Description

technical field [0001] The present invention relates to a base station apparatus, a terminal apparatus, a transmission method, and a reception method. Background technique [0002] In 3GPP-LTE (3rd Generation Partnership Project Radio Access Network Long Term Evolution, 3rd Generation Partnership Project Radio Access Network Long Term Evolution, hereinafter referred to as "LTE"), OFDMA (Orthogonal Frequency Division) is used as a downlink communication method. Multiple Access, Orthogonal Frequency Division Multiple Access), and SC-FDMA (Single Carrier Frequency Division Multiple Access) is used as an uplink communication method (for example, see Non-Patent Documents 1, 2, and 3). [0003] In LTE, a radio communication base station apparatus (hereinafter abbreviated as "base station") allocates resource blocks (RBs) within a system frequency band to a radio communication terminal apparatus (hereinafter abbreviated as subframe) for each time unit called a subframe. "Terminal"...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04J1/00H04J11/00
CPCH04L5/001H04L5/0094H04J11/0079H04W72/042H04L5/0051H04W72/1289H04L5/0053H04W72/23
Inventor 齐藤佳子堀内绫子中尾正悟西尾昭彦今村大地A.戈里谢克埃德勒冯埃布瓦特冯素娟
Owner SUN PATENT TRUST
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