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ePDCCH resource unit number confirming method and ePDCCH resource unit number confirming device

A resource unit and determination method technology, applied in digital transmission system, network planning, pilot signal allocation, etc., can solve problems such as no ePDCCH transmission scheme, great impact on control signaling demodulation performance, etc.

Active Publication Date: 2013-09-25
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to different CSI-RS configurations, the number of REs available in the PDSCH area is different, that is, the number of REs used to transmit ePDCCH is different, which has a great impact on the performance of control signaling demodulation
[0008] At present, there is no specific ePDCCH transmission scheme for LTErel-11 version

Method used

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  • ePDCCH resource unit number confirming method and ePDCCH resource unit number confirming device

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Embodiment 1

[0029] Embodiment 1 describes a method for determining the number of ePDCCH resource units when eCCE is used as the minimum resource unit of ePDCCH.

[0030] When eCCE is used as the minimum resource unit of ePDCCH, it can be defined that the size of eCCE is roughly the same as the size of CCE in the LTE Rel-8 / 9 / 10 system, and the size of eCCE in subframes under different configurations may be the same or slightly different. It is mainly determined by the configuration of the subframe (the number of available REs in the PDSCH region of the subframe under different configurations is different). The sizes of eCCEs in subframes with the same configuration may be the same or slightly different, which is mainly determined by the mapping method from eCCEs to REs. Specifically, a PRBpair contains an integer number of eCCEs, and the number is denoted as M. The value of M can be 2, 3 or 4. When the size of the eCCE is defined, the specific value of M depends on the number of eCCEs in a...

Embodiment 2

[0036] Embodiment 1 describes a method for determining the number of ePDCCH resource units when eREG is used as the minimum resource unit of ePDCCH.

[0037] When eREG is used as the minimum resource unit of ePDCCH, the size of eREG can be defined to be the same as the size of REG in the LTE Rel-8 / 9 / 10 system (including 4 REs) or can be defined as other values. The number of REs contained in eREG is Fixed, when different mapping methods (eREG-to-RE mapping methods) are used, the number of eREGs in the PRBpair under the same configuration may be different.

[0038] Such as Figure 4a As shown, the data region contains 52 REs available for ePDCCH. When it is defined that an eREG includes 4 REs, and the mapping method is to form a group of 4 adjacent REs in the frequency domain, there are 13 eREGs in total. for Figure 4b For the PRBpair shown, the data area contains 102 REs available for ePDCCH. If the same mapping method is used, there are 23 eREGs in total (some of the REs ...

Embodiment 3

[0041] Embodiment 3 describes a method for determining the number of ePDCCH resource units when an evenly divided resource block is used as the minimum resource unit of the ePDCCH.

[0042] In one PRB pair, there are 144 REs in total except the 24 REs occupied by the DMRS. The 144 REs in one PRB pair can be equally divided into 8, 12, 16, 24 or 36 resource blocks. In the embodiment of the present invention, such a resource block is used as the minimum resource unit of the ePDCCH to perform resource allocation for the ePDCCH.

[0043] in such as Figure 5a One of the cases shown: the first three symbols are occupied by PDCCH, there are 4 CRS ports (as shown in the squares filled with oblique lines), the REs occupied by DMRS are filled with horizontal lines in the figure, and the CSI-RS occupies RE fills the grid with vertical lines in the figure. in such as Figure 5b One of the cases shown: the previous symbol is occupied by PDCCH, there are 2 CRS ports (as shown in the di...

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Abstract

The invention discloses an ePDCCH resource unit number confirming method and an ePDCCH resource unit number confirming device. The ePDCCH resource unit number confirming method includes the following steps. The number of codes, the number of CRS ports, the number of DMRS ports and CSI-RS configuration are confirmed, wherein the number of codes, the number of CRS ports and the number of DMRS ports are occupied by a PDCCH in a subframe. According to the number of codes, the number of CRS ports and the number of DMRS ports and CSI-RS configuration, the number of REs in a PDSCH zone of the subframe is confirmed, wherein the REs can be used for transmitting an ePDCCH. According to the number of the confirmed REs, the resource unit number occupied by the ePDCCH in the subframe is confirmed. The resource unit number of the ePDCCH can be confirmed when the ePDCCH is transmitted in the PDSCH data zone according to the ePDCCH resource unit number confirming method and the ePDCCH resource unit number confirming device.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and device for determining the number of ePDCCH resource units. Background technique [0002] In the LTE (LongTermEvolution, long-term evolution) Rel-8 / 9 / 10 system, the downlink control channel PDCCH (PhysicalDownlinkControlChannel, physical downlink control channel) is sent in each radio subframe, such as figure 1 As shown, it occupies the first N OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) symbol transmissions of a subframe, where N may be 1, 2, 3, or 4. [0003] The control area for transmitting PDCCH in the LTERel-8 / 9 / 10 system is composed of logically divided CCEs (ControlChannelElement, control channel element), and one of the CCEs is composed of 9 REGs (REGroup, RE group). An REG is composed of 4 REs (ResourceElements, resource elements) that are the same in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/10H04W72/04
CPCH04L5/0023H04L5/0048H04L5/0053H04L5/0094H04B7/26H04W72/00H04W72/04H04W72/23
Inventor 拉盖施潘学明赵锐张然然
Owner DATANG MOBILE COMM EQUIP CO LTD