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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: 2015-07-08
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 this 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 according to this embodiment, allocation control information is transmitted from base station 100 to terminal 200 using PDCCH and R-PDCCH. PDCCH uses CRS, which is a common reference signal receivable by all terminals. DM-RS for the dedicated reference signal.

[0133] Figure 4 Main structural elements of the base station 100 according to this embodiment are shown. exist Figure 4 In the illustrated base station 100, the search interval setting unit 103 sets a search interval having a plurality of DCI allocation area candidates in the PDCCH area and the R-PDCCH area, and the allocation unit 106 allocates allocation control information (that is, DCI) to the search area. Resources in one DCI allocation area c...

Embodiment approach 2

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

[0238] Next, methods 1 to 3 for setting search intervals 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, so citing Figure 6 and Figure 8 Be explained.

[0240] In addition, in the following description, as in Embodiment 1, as the C-SS, a total of 6 candidate DCI allocation areas are set with 4 candidates (16CCE) for CCE aggregation number 4 and 2 candidates (16CCE) for CCE aggregation number 8. (ie, blindly decoded region candidates). In addition, as the UE-SS, 6 candidates (6CCE), 6 candidates (12CCE), 2 candidates (8CCE), and 2 c...

Embodiment approach 3

[0280] In this embodiment, a case where a search interval is 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, so citing Figure 6 and Figure 8 Be explained.

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

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Abstract

A base station device causing no decrease in system throughput and guaranteeing the reception quality at a terminal when a DCI directed toward the terminal is mapped to a PDCCH region and an R-PDCCH region. A search space setting unit (103) sets a search space having a plurality of allocation candidates, in both regions. An allocation unit (106) allocates control information to a resource in one allocation candidate in the search space. The ratio of the number of allocation candidates in the R-PDCCH region to the number of allocation candidates in the PDCCH region in the search space 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 to the number of allocation candidates in the PDCCH region in the search space for a terminal using CRS in the R-PDCCH region.

Description

technical field [0001] The present invention relates to a base station device, a terminal device, 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 Multiple Access, Orthogonal Frequency Division Multiple Access), adopt SC-FDMA (Single Carrier Frequency Division Multiple Access, single carrier frequency division multiple access) as the communication method of uplink (for example, refer to non-patent documents 1, 2, 3 ). [0003] In LTE, a radio communication base station device (hereinafter referred to as "base station") allocates a resource block (Resource Block: RB) within a system frequency band to a radio communication terminal device (hereinafter referred to as "subframe") in each time unit called a subframe....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04J1/00H04J11/00
CPCH04L5/0094H04L5/0053H04W72/042H04L5/001H04J11/0079H04L5/0051H04W72/23
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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