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Method for sending PDCCHs (Physical Downlink Control Channels) and equipment for sending PDCCHs

A technology of equipment and user equipment, applied in network traffic/resource management, electrical components, wireless communication, etc., can solve problems such as strong interference between cells in the downlink control area, and achieve the effect of improving coverage performance

Active Publication Date: 2012-04-04
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Embodiments of the present invention provide a method and device for sending PDCCH to solve the problem of relatively strong inter-cell interference in the downlink control area in the prior art

Method used

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  • Method for sending PDCCHs (Physical Downlink Control Channels) and equipment for sending PDCCHs
  • Method for sending PDCCHs (Physical Downlink Control Channels) and equipment for sending PDCCHs
  • Method for sending PDCCHs (Physical Downlink Control Channels) and equipment for sending PDCCHs

Examples

Experimental program
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Effect test

example 1

[0124] Assume that two sets of users are divided, that is, the strong interference set U high and the low interference set U low . At the same time, the subframes bearing the PDCCH are divided into sets R1, R2, R3, and R4, and the second method is selected when determining the transmission parameters. Assuming that the original UE priority queues are UE1, UE2, UE3, UE4, and UE5 in sequence, UE2 and UE5 need to transmit PDCCH with higher power, and belong to the strong interference set U high , UE1, UE3, UE5 belong to the low interference set U low .

[0125] For cells in C1:

[0126] In each subframe in R1, the original UE priority queues are adjusted according to the user set to which they belong. The adjusted UE priority queues are UE2, UE5, UE1, UE3, and UE4; each UE in the adjusted queues in turn allocate PDCCH resources and allow U low UEs in (UE1, UE3, UE4) transmit PDCCH with lower aggregation level and higher power.

[0127] In other subframes, the original UE p...

example 2

[0135] Assume that two sets of users are divided, that is, the strong interference set U high and the low interference set U low . At the same time, the subframes bearing the PDCCH are divided into sets R1, R2, R3, and R4, and mode 1 is selected when determining transmission parameters. Assuming that the original UE priority queues are UE1, UE2, UE3, UE4, and UE5 in sequence, UE2 and UE5 need to transmit PDCCH with higher power, and belong to the strong interference set U high , UE1, UE3, UE5 belong to the low interference set U low .

[0136] For cells in C1:

[0137] In each subframe in R1, PDCCH resources are allocated to UEs in sequence according to the original UE priority queue, and U low The UEs in transmit PDCCH with lower aggregation level and higher power;

[0138] In other subframes, PDCCH resources are allocated to UEs in sequence according to UE priority queues, and U high Limit the PDCCH transmission power of the UEs (ie UE2, UE5) in the middle, and select...

example 3

[0141] Assume that three user sets are divided, that is, the strong interference set U exter , medium interference set U mediate , low interference set U int er . At the same time, divide the subframes carrying PDCCH into sets R1, R2, and R3. When determining the transmission parameters, choose method 2, and use the method of reducing power and increasing the aggregation level on subframes carrying non-strong interference PDCCH to try to be U exter PDCCH resources are allocated to UEs in . Assume that the original UE priority queues are UE1, UE2, UE3, UE4, UE5, and UE6 in sequence. Among them, UE2 and UE5 need to transmit PDCCH with higher power and belong to the strong interference set U exter , UE1 and UE6 belong to the low interference set U int er , UE3 and UE4 belong to the medium interference set U mediate .

[0142] For each subframe belonging to R1:

[0143] For the cell belonging to C1, the original UE priority queue is adjusted according to the user set to wh...

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Abstract

The embodiment of the invention relates to the technical field of wireless communications and particularly relates to a method for sending PDCCHs (Physical Downlink Control Channels) and equipment for sending the PDCCHs which are used for solving the problem that the inter-cell interference (ICI) of a downlink control area is strong in the prior art. The method comprises the following steps of: dividing all subframes in a resource planning time period into a plurality of subframe sets according to normalized transmitting power values of the PDCCHs; and determining transmitting parameters which bear subframes of the PDCCHs in each subframe set according to a compared result of the transmitting power values and normalized power threshold values of the PDCCHs with strong interference, and further, sending the PDCCHs according to corresponding transmitting parameters, wherein the PDCCHs with the strong interference are the PDCCHs of which the transmitting power values are larger than first threshold values correspondingly. When the transmitting parameters which bear the subframes of the PDCCHs are determined, the ICI is considered; therefore, the ICI of the downlink control area is lowered.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and equipment for sending PDCCH. Background technique [0002] The LTE (Long Term Evolution, long-term evolution) system adopts OFDM (Orthogonal Frequency Division Multiplexing) technology in the downlink, and the problem of intra-cell interference is basically solved, but at the cost of inter-cell interference (ICI, Inter -Cell Interference) may be more serious than traditional 3G systems. [0003] A common solution to inter-cell interference is to use frequency reuse, that is, adjacent cells use different frequency bands to form a network. The traditional networking mode with frequency reuse coefficients of 3, 4, and 7 poses a great challenge to the LTE system with a system bandwidth of up to 20MHz: in a scenario with a bandwidth of 20MHz, if the frequency reuse coefficient is 3, a The bandwidth required by the LTE system is as high as 60MHz. O...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W72/12
CPCH04W28/048H04W28/18H04W72/00H04W52/243
Inventor 朱志球
Owner DATANG MOBILE COMM EQUIP CO LTD
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