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Enhanced pdcch search space processing method based on dm-rs

A DM-RS and search space technology, applied in network traffic/resource management, digital transmission systems, electrical components, etc., can solve problems such as search space design, inability to obtain frequency domain diversity gain, and frequency domain channel deep fading

Inactive Publication Date: 2016-05-04
POTEVIO INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for the enhanced PDCCH based on DM-RS, its search space cannot be designed according to the traditional PDCCH search space. The reason is that the traditional PDCCH covers the full bandwidth, and its search space design adopts the CCE sequential ordering method to obtain frequency domain diversity through interleaving. gain; and the enhanced PDCCH uses DM-RS to obtain beamforming gain, which requires that the control information of each UE occupy the time-frequency resources to be consistent with the PDSCH, that is, continuously occupy all OFDM symbols in the PDSCH area and concentrate on several consecutive In this way, if the traditional PDCCH search space design is adopted, the UE's control information cannot obtain frequency domain diversity gain, and is easily affected by deep channel fading in the frequency domain, so reliability cannot be guaranteed

Method used

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  • Enhanced pdcch search space processing method based on dm-rs
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  • Enhanced pdcch search space processing method based on dm-rs

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Embodiment 1

[0037] In this embodiment 1, the search space is designed based on CCE interleaving sorting, specifically including figure 2 The flow shown:

[0038] In step 201, all CCEs in the enhanced PDCCH are sequentially sorted in ascending order of frequency to obtain a CCE sequence.

[0039] Step 202, performing interleaving and sorting on the CCE sequence to obtain a search space.

[0040] Take the number of all CCEs of the enhanced PDCCH as N CCE example pair figure 2 The flow shown is described:

[0041] First, for all N in the enhanced PDCCH CCE CCEs are sorted. Here, all N in the enhanced PDCCH are sorted according to the traditional PDCCH sorting method. CCE CCEs are sequentially sorted, that is, all CCEs are sorted in ascending order of frequency to obtain a CCE sequence, and the sequence numbers of the CCEs in the CCE sequence are 0, 1, ..., N CCE -1.

[0042] Afterwards, perform interleaving and sorting on the obtained CCE sequences, that is, perform interleaving pro...

Embodiment 2

[0056] This embodiment 2 is different from embodiment 1. In this embodiment 2, it defines respective search spaces for different aggregation levels, specifically including Figure 4 The flow shown:

[0057] Step 401 , for the aggregation level L, group all CCEs in the enhanced PDCCH in units of L, where the value of L is 1, 2, 4, or 8.

[0058] Step 402, interleaving and sorting the sequence numbers of all CCE groups to obtain a search space.

[0059] In this step 402, the specific operation of interleaving and sorting the sequence numbers of all CCE groups is: according to the principle of row-by-row writing, the sequence numbers of all CCE groups are sent to the block interleaver whose column number is a set value G, The principle of reading is to use the obtained sequence numbers of all CCE groups as the sequence numbers of all CCE groups after interleaving and sorting.

[0060] It can be seen that in this embodiment 2, for the aggregation level L, all CCEs are grouped in...

Embodiment 3

[0069] In the above-mentioned embodiment 1 and embodiment 2, the distribution of the RB pairs carrying the enhanced PDCCH is not limited, and it does not need to perform any processing on the CCEs defined above.

[0070] However, in Embodiment 3, it is applied to a scenario where the RB pairs carrying the enhanced PDCCH are symmetrically distributed on both sides of the system bandwidth, and the search space is mainly designed based on frequency hopping. In this solution, it is necessary to further perform processing on the CCE: to divide the CCE into two CCE segments (CCEsegment), specifically as Figure 5 shown. Based on this, when defining CCE above, the must be divisible by 2.

[0071] In the mth CCE, the resource positions of the two CCE segments obtained by dividing the CCE (n PRB , i) is:

[0072]

[0073] Among them, n PRB Indicates the RB number, i indicates the number of the CCE segment in the RB, is the number of RB pairs in the downlink system bandwidth,...

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Abstract

The invention provides a DM-RS (demodulation reference signal) based method for processing a search space of an enhanced PDCCH (physical downlink control channel). The DM-RS based processing method includes the steps of continuously sequencing all control channel elements (CCE) in the enhanced PDCCH in a frequency-ascending sequence to obtain CCE sequences, and interleaving and sequencing the CCE sequences to obtain the search space.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a search space processing method of an enhanced downlink control channel (PDCCH) based on a pilot frequency for demodulation (DM-RS). Background technique [0002] The traditional PDCCH is the PDCCH of version 8 (referred to as R8) or R9 or R10, occupying 1 to 3 OFDM symbols, and its control channel element (CCE) consists of 9 resource element groups (REG), a total of 36 resource elements ( RE). In order to support blind detection, traditional PDCCH introduces a search space, and each UE completes blind detection of control information with aggregation levels 1, 2, 4, and 8 in the search space. The CCEs in the traditional PDCCH are arranged continuously, and scrambling and interleaving processing are required before physical resource mapping to ensure better frequency domain diversity gain and achieve inter-cell interference randomization. [0003] With the intro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04W28/16
Inventor 陈哲池连刚鲁智李婧吴联海王浩
Owner POTEVIO INFORMATION TECH CO LTD