CN104717736B - A kind of LTE method for controlling downlink power and equipment - Google Patents

A kind of LTE method for controlling downlink power and equipment Download PDF

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Publication number
CN104717736B
CN104717736B CN201310682046.1A CN201310682046A CN104717736B CN 104717736 B CN104717736 B CN 104717736B CN 201310682046 A CN201310682046 A CN 201310682046A CN 104717736 B CN104717736 B CN 104717736B
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power
enb
offset value
service priority
link information
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CN104717736A (en
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邵泽才
边森
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/281—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account user or data type priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of LTE method for controlling downlink power and equipment, this method comprises: base station eNB is that the corresponding wireless elements RE of downlink physical DSCH Downlink Shared Channel PDSCH channel distributes transmission power；The eNB is adjusted according to the transmission power of the service priority of user equipment (UE) and the position of UE or link information RE corresponding to the UE.In the present invention, the reasonability of transmission power distribution is improved.

Description

LTE downlink power control method and equipment
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a device for controlling LTE downlink power.
Background
The main significance of the downlink power control is as follows: compensating for the path loss and shadowing of the channel, reducing intra-cell and inter-cell interference, and reducing the energy consumption of the system. An OFDMA (Orthogonal Frequency Division Multiple Access) technology is adopted in an LTE (Long Term Evolution) system, so that interference in a cell can be effectively eliminated to some extent; the LTE adopts an RNTP (Relative Narrowband transmit Power)/HII (High Interference Indication)/OI (overload indicator) Indication scheme to achieve effective cancellation of inter-cell Interference; moreover, LTE is more concerned with the increase of system capacity, i.e. the increase of system rate obtained at a certain power. Based on the above three points, the LTE adopts semi-static power allocation.
The LTE PDSCH (Physical Downlink Shared Channel) semi-static power allocation scheme is as follows:
an eNodeB (base station) determines downlink transmission energy of each RE (Radio Element). The UE considers that EPRE (energy per radio element RE) of the downlink reference symbol is not changed in the entire downlink system bandwidth and subframe until power information (reference channel power) of different reference signals is received, and the value range is Inter (INTEGER) (-60.. 50), which is a cell-specific parameter configured by a higher layer.
For each UE (User Equipment User)Device), ρ is a ratio of EPRE of data subcarrier in PDSCH that is considered not to contain CRS (Cell Reference Signal) to EPRE of CRSARepresents:
ρA＝δpower-offset+PA+10log10(2)[dB](ii) a 4-transmission system adopting diversity precoding scheme
ρA＝δpower-offset+PA[dB](ii) a Other systems
Wherein, PAIs a UE-specific parameter configured by a high layer in a semi-static way, and the value range of the UE-specific parameter is [ -6, -4.77, -3, -1.77,0,1,2,3]dB。
For each UE, the ratio of the EPRE of the data subcarrier in the PDSCH containing CRS to the EPRE of the CRS is considered as rhoBWhich can be calculated according to the following table:
table one, cell specific rhoB/ρA
Wherein, PBIs a parameter of cell-specific configured by a higher layer.
As shown above, the semi-static power allocation scheme for LTE downlink PDSCH is according to the referrencignalpower, ρAAnd ρBThus, the EPRE of each RE of each PDSCH can be obtained.
From rhoAThe expression (c) indicates that there is only a 9dB power adjustment space for each UE. Moreover, the current scheme ignores the differences between UEs and between services with the aim of improving the cell throughput, and does not comprehensively consider factors such as UE types, locations, service characteristics, and the like during power allocation.
Disclosure of Invention
The invention provides a method and equipment for controlling LTE downlink power, which are used for improving the reasonability of transmission power distribution.
In order to achieve the above object, the present invention provides a long term evolution LTE downlink power control method, which includes:
a base station eNB allocates transmission power for wireless element REs corresponding to a downlink physical downlink shared channel PDSCH channel;
and the eNB adjusts the transmitting power of the RE corresponding to the UE according to the service priority of the UE and the position or link information of the UE.
An embodiment of the present invention further provides a base station eNB, including:
the power allocation module is used for allocating transmitting power to the wireless element RE corresponding to the PDSCH channel;
and the power adjusting module is used for adjusting the transmitting power of the RE corresponding to the UE according to the service priority of the UE and the position or link information of the UE.
In the above embodiments of the present invention, after the NB allocates the transmission power to the RE corresponding to the downlink PDSCH channel, the transmission power of the RE corresponding to the UE is adjusted according to the service priority of the UE and the location or link information, and when the transmission power of the RE corresponding to the UE is determined, the service characteristics, the geographical location, and the like of the UE are comprehensively considered, so that the reasonability of transmission power allocation is improved.
Drawings
Fig. 1 is a flowchart illustrating an LTE downlink power control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a correspondence relationship between a power offset value and a service priority and a PL of a UE according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an eNB according to an embodiment of the present invention.
Detailed Description
In view of the problems in the prior art, embodiments of the present invention provide a technical solution for LTE downlink power control. In the technical scheme, after the eNB allocates the transmission power to the RE corresponding to the downlink PDSCH, the transmission power of the RE corresponding to the UE is adjusted according to the service priority and the position or the link information of the UE, and when the transmission power of the RE corresponding to the UE is determined, the service characteristics, the geographical position and the like of the UE are comprehensively considered, so that the reasonability of the transmission power allocation is improved.
The eNB may allocate the transmission power to the REs corresponding to the downlink PDSCH channel according to an existing power allocation model.
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are some, not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, a flowchart of an LTE downlink power control method provided in an embodiment of the present invention may include the following steps:
step 101, the eNB allocates transmission power to REs corresponding to a downlink PDSCH channel.
Specifically, in the embodiment of the present invention, the eNB may perform power allocation on REs corresponding to downlink PDSCH channels according to an existing power allocation model, and specific implementation thereof is not described herein again.
Step 102, the eNB adjusts the transmission power of the RE corresponding to the UE according to the service priority of the UE and the location or link information of the UE.
Specifically, considering that the requirements of different services on the transmission power may be different, and the influence of information such as the geographical location of the UE or the link on the transmission power, in the embodiment of the present invention, in order to make the allocation of the transmission power more reasonable, after the eNB allocates the REs corresponding to the downlink PDSCH channel to the UE, the transmission power of the REs corresponding to the UE (i.e., the allocated REs) needs to be adjusted according to the service priority of the UE and the location or link information.
For example, for UEs with the same traffic priority in the eNB serving cell, the transmit power of the RE corresponding to the UE at the center may be reduced and the transmit power of the RE corresponding to the UE at the edge may be appropriately increased under the condition of ensuring the traffic rate.
When the eNB adjusts the transmit power of the RE corresponding to the UE according to the service priority of the UE and the PL of the UE, the eNB may first determine a power offset value of the RE transmit power corresponding to the UE according to the service priority of the UE and the location or link information of the UE, and then offset the transmit power of the RE corresponding to the UE according to the power offset value.
Preferably, in the embodiment of the present invention, the eNB shifts the transmit power of the RE corresponding to the UE according to the power offset value, which may be specifically implemented by the following formula:
P*=P+△P；
wherein P is the transmission power after the RE offset corresponding to the UE, P is the transmission power before the RE offset corresponding to the UE, and △ P is the power offset value.
In the embodiment of the present invention, the corresponding relationship between the power offset value and the service priority of the UE and the location or link information may be preset, and when the transmission power needs to be adjusted, the power offset value of the transmission power of the RE corresponding to the UE may be determined according to the service priority of the UE and the PL query of the corresponding relationship;
preferably, in the embodiment of the present invention, the location or link information of the UE may be PL (PathLoss) of the UE, where:
when the service priorities are the same, the larger the PL of the UE is, the larger the power offset value of the transmission power of the RE corresponding to the UE is;
when PL is the same, the higher the traffic priority of the UE is, the larger the power offset value of the transmission power of the RE corresponding to the UE is.
It should be noted that, in the embodiment of the present invention, when the UE carries multiple services, the eNB may adjust the transmit power of the RE corresponding to the UE according to the service priority of the service with the highest service priority among the multiple services and the location or link information of the UE.
In order to better understand the technical solution provided by the embodiment of the present invention, the technical solution provided by the embodiment of the present invention is described in more detail below with reference to a specific application scenario.
In this embodiment, the Service priority is characterized by QCI (Quality of Service) class identifier (QoS class identifier); the position or link information of the UE is represented by PL, the value range of the power Offset value (Offset) is (-5, + 5), and the value range of PL is (0, 30); the correspondence of the power offset value to the traffic priority of the UE, and the PL can be seen in fig. 2.
As shown in FIG. 2, the ordinate is Offset, and the variation range is-5- + 5; the abscissa is PL, and the variation range is 0-30; take the service with QCI =1 as an example:
the Offset set function is:
Offset=2/12*PL+3；（0＜PL＜12）
Offset=5（12＜PL＜30）
similarly, other QCIs are also a piecewise function.
According to the corresponding relationship shown in fig. 2, after the eNB allocates power to the REs corresponding to the downlink PDSCH channel according to the existing power allocation model, when the power allocation needs to be adjusted, the eNB may determine a corresponding power Offset value (Offset) according to the service priority of the UE (represented by QCI in this embodiment) and the PL query of the UE, and further Offset the generated power of the REs corresponding to the UE according to the power Offset value.
For example, assuming that QCI =1 and PL =6 of the UE, according to the correspondence relationship shown in fig. 2, it can be determined that the power Offset value corresponding to the UE is Offset =2/12 × PL +3=4, and the transmission power P × = P +4 after the RE corresponding to the UE is Offset (the transmission power of the RE corresponding to the UE is increased).
In this embodiment, the power offset value corresponding to the QCI of high level (the smaller the value of QCI, the higher the level of QCI) is larger, and the power offset value corresponding to the QCI of low level is smaller; meanwhile, when the PL is larger, the corresponding power offset value is larger, whereas when the PL is smaller, the corresponding power offset value is smaller, even negative, that is, the transmission power is reduced.
It should be noted that the corresponding relationship between QCI, PL, and Offset provided in this embodiment is only a specific implementation of the technical solution provided in the embodiment of the present invention, and is not a limitation to the scope of the present invention, that is, when QCI is the same, the variation relationship between Offset and PL is not limited to the straight line shown in fig. 2, and a curve may be used as long as Offset is positively correlated with QCI and PL.
As can be seen from the above description, in the embodiment of the present invention, after the eNB allocates the transmission power to the RE corresponding to the downlink PDSCH channel, the transmission power of the RE corresponding to the UE is adjusted according to the service priority of the UE and the location or link information, and when the transmission power of the RE corresponding to the UE is determined, the service characteristics, the geographical location, and the like of the UE are comprehensively considered, so that the reasonability of transmission power allocation is improved.
Based on the same technical concept, the embodiment of the invention also provides an eNB, which can be applied to the method embodiment.
As shown in fig. 3, a schematic structural diagram of an eNB provided in an embodiment of the present invention may include:
a power allocation module 31, configured to allocate transmit power to a radio element RE corresponding to a PDSCH (physical downlink shared channel) channel;
a power adjustment module 32, configured to adjust the transmit power of the RE corresponding to the UE according to the service priority of the UE and the location or link information of the UE.
The power adjustment module 32 is specifically configured to determine a power offset value of the transmit power of the RE corresponding to the UE according to the service priority of the UE and the location or link information of the UE; and offsetting the transmitting power of the RE corresponding to the UE according to the power offset value.
The power adjusting module 32 is specifically configured to implement offsetting the transmit power of the RE corresponding to the UE according to the power offset value by using the following formula:
P*=P+△P；
wherein P is the transmission power after the RE offset corresponding to the UE, P is the transmission power before the RE offset corresponding to the UE, and △ P is a power offset value.
Wherein the location or link information of the UE is a path loss PL of the UE; wherein,
when the service priorities are the same, the larger the PL of the UE is, the larger the power offset value of the transmitting power of the RE corresponding to the UE is;
and when the PL is the same, the higher the service priority of the UE is, the larger the power offset value of the transmission power of the RE corresponding to the UE is.
The power adjustment module 32 is specifically configured to, when the UE carries multiple services, adjust the transmit power of the RE corresponding to the UE according to the service priority of the service with the highest service priority among the multiple services and the location or link information of the UE.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for enabling a terminal device (which may be a mobile phone, a personal computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.

Claims (8)

1. A Long Term Evolution (LTE) downlink power control method is characterized by comprising the following steps:
a base station eNB allocates transmission power for wireless element REs corresponding to a downlink physical downlink shared channel PDSCH channel;
the eNB adjusts the transmitting power of the RE corresponding to the UE according to the service priority of the UE and the position or link information of the UE;
the eNB adjusts the transmit power of the RE corresponding to the UE according to the service priority of the UE and the location or link information of the UE, specifically:
the eNB determines a power offset value of the transmitting power of the RE corresponding to the UE according to the service priority of the UE and the position or link information of the UE;
and the eNB shifts the transmitting power of the RE corresponding to the UE according to the power offset value.
2. The method of claim 1, wherein the eNB shifts the transmission power of the RE corresponding to the UE according to the power offset value, which is specifically implemented by the following formula:
P*＝P+△P；
wherein P is the transmission power after the RE offset corresponding to the UE, P is the transmission power before the RE offset corresponding to the UE, and △ P is a power offset value.
3. The method of claim 2, wherein the location or link information of the UE is a path loss PL of the UE; wherein,
when the service priorities are the same, the larger the PL of the UE is, the larger the power offset value of the transmitting power of the RE corresponding to the UE is;
and when the PL is the same, the higher the service priority of the UE is, the larger the power offset value of the transmission power of the RE corresponding to the UE is.
4. The method of claim 1, wherein the eNB adjusts the transmit power of the RE corresponding to the UE according to the service priority of the UE and the location or link information of the UE, specifically:
when the UE carries a plurality of services, the eNB adjusts the transmitting power of the RE corresponding to the UE according to the service priority of the service with the highest service priority in the services and the position or link information of the UE.
5. A base station (eNB), comprising:
the power allocation module is used for allocating transmitting power to the wireless element RE corresponding to the PDSCH channel;
the power adjusting module is used for adjusting the transmitting power of the RE corresponding to the UE according to the service priority of the UE and the position or link information of the UE;
the power adjustment module is specifically configured to determine a power offset value of the transmit power of the RE corresponding to the UE according to a service priority of the UE and a location or link information of the UE; and offsetting the transmitting power of the RE corresponding to the UE according to the power offset value.
6. The eNB of claim 5, wherein the power adjustment module is specifically configured to offset the transmit power of the RE corresponding to the UE according to the power offset value by:
P*＝P+△P；
wherein P is the transmission power after the RE offset corresponding to the UE, P is the transmission power before the RE offset corresponding to the UE, and △ P is a power offset value.
7. The eNB of claim 6 wherein said UE's location or link information is the path loss PL for said UE; wherein,
when the service priorities are the same, the larger the PL of the UE is, the larger the power offset value of the transmitting power of the RE corresponding to the UE is;
and when the PL is the same, the higher the service priority of the UE is, the larger the power offset value of the transmission power of the RE corresponding to the UE is.
8. The eNB of claim 5,
the power adjustment module is specifically configured to, when the UE carries multiple services, adjust the transmit power of the RE corresponding to the UE according to the service priority of the service with the highest service priority among the multiple services and the location or link information of the UE.
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CN108401284A (en) * 2017-02-06 2018-08-14 北京三星通信技术研究有限公司 Poewr control method and user equipment in a kind of communication system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1610273A (en) * 2003-10-24 2005-04-27 埃沃柳姆公司 A method for setting a power offset for power control of a downlink shared channel
CN1866777A (en) * 2005-11-17 2006-11-22 华为技术有限公司 Method for setting power bias and carrying out system dispatching
CN102638894A (en) * 2012-04-27 2012-08-15 电信科学技术研究院 Method and equipment for distributing PDSCH (physical downlink shared channel) power
CN102647794A (en) * 2012-05-16 2012-08-22 刘星 Uplink resource allocation method in combination with PHR (Power Headroom Report) in LTE (Long Term Evolution) system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1610273A (en) * 2003-10-24 2005-04-27 埃沃柳姆公司 A method for setting a power offset for power control of a downlink shared channel
CN1866777A (en) * 2005-11-17 2006-11-22 华为技术有限公司 Method for setting power bias and carrying out system dispatching
CN102638894A (en) * 2012-04-27 2012-08-15 电信科学技术研究院 Method and equipment for distributing PDSCH (physical downlink shared channel) power
CN102647794A (en) * 2012-05-16 2012-08-22 刘星 Uplink resource allocation method in combination with PHR (Power Headroom Report) in LTE (Long Term Evolution) system

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