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Combined adaptive resource allocation method and device for PDCCH (Physical Downlink Control Channel)

A resource allocation and self-adaptive technology, applied in electrical components, wireless communication and other directions, can solve the problems of limited, limited system capacity, limited number of CCEs, etc., to achieve the effect of scheduling the number of users

Active Publication Date: 2011-08-03
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0033] The disadvantage of using this solution is that when the product is implemented, it is found that the allocation of LTE downlink resources is mainly limited by the number of PDCCHs: even if there are PRB resources available for PDSCH transmission in the current subframe, when the channel condition is poor, most UEs may fail. With a higher PDCCH aggregation level, the number of CCEs used for PDCCH transmission is limited, which will lead to limited system capacity
[0034] Therefore, there is currently a lack of a technical solution to solve the conflict between PDCCH detection performance and increasing the number of supported scheduling users

Method used

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  • Combined adaptive resource allocation method and device for PDCCH (Physical Downlink Control Channel)
  • Combined adaptive resource allocation method and device for PDCCH (Physical Downlink Control Channel)
  • Combined adaptive resource allocation method and device for PDCCH (Physical Downlink Control Channel)

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Embodiment 1

[0086] This embodiment provides a non-UE-specific PDCCH adaptive allocation of time-frequency domain resources and power resources, specifically including:

[0087] 1) The load statistics module gives the load status of the cell at the current moment. When the cell load is greater than the set threshold, determine the 4 CCEs supported by the non-UE-specific PDCCH during resource allocation in the time-frequency domain; otherwise, determine the use of 8 CCEs;

[0088] 2) For non-UE-specific PDCCH power allocation to meet the principle of coverage, according to the target signal-to-interference and noise ratio SINR that the cell edge users expect to achieve target , noise power spectral density m, frequency bandwidth RE of a single resource unit RE band , Downlink noise figure NoiseFigure down , downlink interference tolerance IoT down and the path loss PL from the center of the cell to the edge of the cell O , to determine the transmission power P that meets the cell edge co...

Embodiment 2

[0099] This embodiment provides a scheme for adaptively allocating time-frequency domain resources and power resources by a UE-specific PDCCH.

[0100] When the eNodeB on the network side receives the downlink broadband channel quality indicator CQI reported by the UE, the PDCCH transmission power is based on the current PDSCH transmission power P PDSCH and the downlink broadband CQI reported by the UE are determined.

[0101] The downlink CQI defined in the LTE protocol 36.213 is calculated according to the default transmission mode of the PDSCH channel. When the eNodeB currently knows the downlink broadband CQI information reported by the UE, it needs to consider the difference between the code rate of the PDSCH indicated by the CQI and the code rate of the PDCCH. Includes the following differences:

[0102] PDCCH adopts convolutional coding, PDSCH adopts Turbo coding, and has different coding gains under the same coding rate;

[0103] PDCCH has interleaving gain, PDSCH h...

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Abstract

The invention discloses a combined adaptive resource allocation method and device for a PDCCH (Physical Downlink Control Channel). The method comprises the following steps of: determining a UE (User Equipment) dedicated PDCCH for transmitting data to single UE and a non-UE dedicated PDCCH for transmitting data to a plurality of UE in the PDCCH to be used for transmitting data in a subframe; and allocating resources to the non-UE dedicated PDCCH and the UE dedicated PDCCH from high to low according to priority respectively, wherein the resources comprise a time frequency domain resource and a power resource, and the priority of the non-UE dedicated PDCCH is higher than that of the UE dedicated PDCCH. By adopting the method and the device, the resource is preferably allocated to the non-UE dedicated PDCCH compared with the UE dedicated PDCCH, so that the non-UE dedicated PDCCH is not limited to the PDCCH allocation, and the problem of conflict between PDCCH detection performance and increase in number of supportable scheduled users is solved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a PDCCH joint adaptive resource allocation method and device. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, PDCCH (Physical Downlink Control Channel, physical downlink control channel) is used to transmit uplink and downlink scheduling control information, and determine PUSCH (Physical Uplink Shared Channel, physical uplink shared channel) and PDSCH (Physical Downlink Shared Channel, physical downlink shared channel) resource allocation, frequency hopping type, transmission mode and other control information. [0003] 1) PDCCH format [0004] The LTE protocol stipulates that the PDCCH channel adopts a QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) modulation method. In order to better adapt the PDCCH transmission of the UE (User Equipment, user equipment) to the channel conditions of the U...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/10
CPCH04W72/10H04W72/56
Inventor 任斌朱志球张凌雁李琼
Owner DATANG MOBILE COMM EQUIP CO LTD
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