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PDCCH (Physical Downlink Control Channel) adaptive blind detection method based on power measurement in 5G system

A power measurement and self-adaptive technology, applied in the field of mobile communication, can solve the problems affecting UE user experience, uncertainty, missed detection, etc.

Active Publication Date: 2019-04-23
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these changes have greatly reduced the number of blind detections, in the case of exhaustion, the maximum number of PDCCH blind detections in a time slot may still reach 44 times. If the blind detection time is too long, the performance of the entire system will be reduced. , while affecting the user experience of the UE
[0005] Feasible algorithms in existing LTE systems include correlation detection algorithms, power measurement algorithms, and self-adaptive algorithms. Among them, correlation detection algorithms are only applicable to situations with high aggregation levels, and cannot reach the real maximum, and the complexity is high. Existing simple The power measurement algorithm of the method only performs blind detection on the candidate with the largest power value, and ends when it fails. This can indeed greatly reduce the number of blind detections, but when there are many users, there is a possibility of missed detection, and the Unstable performance at poor times
The adaptive algorithm has uncertainty due to the change of channel quality.

Method used

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  • PDCCH (Physical Downlink Control Channel) adaptive blind detection method based on power measurement in 5G system
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  • PDCCH (Physical Downlink Control Channel) adaptive blind detection method based on power measurement in 5G system

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Embodiment 1

[0036] Due to the variability of the channel quality status, the current aggregation level of the UE cannot be accurately determined from the CQI value alone. In order to compensate for this uncertainty of the adaptive algorithm, the power measurement is performed on the candidate sets of all aggregation levels in the space. Sort in descending order, and filter the sorted candidate sequence numbers according to the situation, and perform blind detection on the candidates corresponding to the maximum power value in the order of blind detection according to the public or UE-specific search space; this embodiment provides a process for distinguishing search spaces The screening methods for removing part of candidate serial numbers in, include:

[0037] S41. Eliminate the candidate set sequence numbers without data transmission, that is, eliminate the average power value of the current candidate set

[0038] S42. Remove the candidate set sequence number that does not meet the lowest p...

Embodiment 2

[0041] In this embodiment, a method for adaptively determining the aggregation level order of the current blind detection by using the CQI value is provided. In this embodiment, the channel quality information measured in the last time slot of the UE is used as the CQI value, and the value is 4 bits. , The value ranges from 0 to 15. If a CQI value is detected, the current blind detection aggregation level sequence is determined according to the current channel environment quality and CQI value, where:

[0042] When 0 <=CQI When <=2, the channel environment quality is poor, select the aggregation level 16 as the first value of the current blind inspection order, and decrease the aggregation level in turn, that is, the order of the aggregation level for blind inspection is: 16, 8, 4, 2, 1;

[0043] When 2

Embodiment 3

[0048] This embodiment is based on embodiment 2, such as figure 2 , According to the current aggregation level order, perform blind inspection on the candidate set with the highest average power at each aggregation level. In this embodiment, according to the blind inspection aggregation level order obtained in Example 2, the aggregation level is selected horizontally, and the maximum power value of each level is selected vertically. The corresponding candidate undergoes blind inspection; if the blind inspection is successful, it ends, otherwise it is judged whether to traverse all the candidates that have not been eliminated. If the candidate is not traversed, the candidate corresponding to the second highest power value is selected in the blind inspection order for blind inspection; If the candidate is eliminated and the CRC check still fails, it means that the DCI format detection has failed. It is judged whether the second DCI format needs to be detected in the space. If yes,...

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Abstract

The invention belongs to the technical field of mobile communication, and in particular relates to a PDCCH (Physical Downlink Control Channel) adaptive blind detection method based on power measurement in a 5G system. The method comprises the steps of: performing judgement of a current search space according to the RNTI type and related high-level parameters, and determining a DCI format to be detected and a corresponding search space; solving PDCCH resource mapping in the search space, taking out a control resource set in a current monitoring occasion, and solving REG bundle interweaving; performing power measurement on all candidate sets in the aggregation level in the current search space, performing descending sorting, recording the serial number of the corresponding candidate set, namely the CCE initial position, and removing a part of candidate serial numbers according to a screening rule; and, adaptively determining the current blind detection aggregation level sequence by utilizing channel quality information CQI, and performing blind detection according to the average power value of the candidate sets in the current aggregation level. By means of the method disclosed by the invention, the average blind detection time can be effectively reduced; and simultaneously, detection leakage is avoided.

Description

Technical field [0001] The invention belongs to the technical field of mobile communication, and particularly relates to a method for adaptive blind detection of a physical downlink control channel (Physical Downlink Control Channel, PDCCH) based on power measurement in a 5G system. Background technique [0002] In the 5G system, the physical downlink control channel mainly performs uplink and downlink scheduling, power control, etc., and the network knows the current UE channel environmental quality status according to the channel quality indicator (CQI) value reported by the current UE, so as to select the appropriate The aggregation level is the number of control channel elements (control channel elements, CCEs) that carry the PDCCH. However, at the terminal, the UE does not know the required DCI format for receiving the PDCCH, the number of CCEs carrying the DCI information, the location of the information, etc. The UE only knows the information it currently needs, such as: t...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04L1/00H04L5/00
CPCH04L1/0038H04L5/0057H04W72/23
Inventor 王丹曾艳辉李小文陈发堂王华华
Owner CHONGQING UNIV OF POSTS & TELECOMM
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