WO2012024856A1

WO2012024856A1 - Power configuration method and device in multiple-input multiple-output (mimo) open loop region

Info

Publication number: WO2012024856A1
Application number: PCT/CN2010/078091
Authority: WO
Inventors: 关艳峰; 宁丁; 陈宪明; 方惠英; 鲁照华
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-08-23
Filing date: 2010-10-25
Publication date: 2012-03-01
Also published as: CN102378335A; CN102378335B

Abstract

A power configuration method in a multiple-input multiple-output (MIMO) open loop region is provided by the present invention, which includes that: when the available subcarriers of a base station are mapped to F frequency subregions and the MIMO open loop region is set in the ith frequency subregion, then the data subcarrier power p₂ of the MIMO open loop region in the ith frequency subregion satisfies: (I), (II); wherein Δ_Fi is the power difference of the frequency subregion F_i and the frequency subregion F₀, 0 ≤ i < F, and F ≥ 1, P_max is the maximum value of the total transmission power of each Orthogonal Frequency Division Multiplexing (OFDM) symbol, P_out is the total actual transmission power of each OFDM symbol; N_used is the number of available subcarriers in each OFDM symbol; Δ_lp and Δ_2p are power restraint values, Δ_lp and Δ_2p are all greater than or equal to 0. A power configuration device in a MIMO open loop region is also provided by the present invention. The service quality for the cell-edge users and the spectrum efficiency of the whole network can be ensured by the present invention.

Description

Power configuration method and device for multiple input multiple output open loop region

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a multiple input multiple output in a communication system

(Multiple Input Multiple Output, MIMO for short) The power configuration method of Open Loop Region (or Open Loop Region, OL Region for short).

BACKGROUND OF THE INVENTION In a wireless communication system, a base station generally refers to a radio transceiver station capable of transmitting information through a mobile switching center and a terminal in a certain radio coverage area. In practical applications, the base station can communicate with the terminal through the uplink and the downlink, where the downlink refers to the transmission direction of the base station to the terminal, and the uplink refers to the transmission direction of the terminal to the base station. Moreover, a plurality of terminals may simultaneously transmit data to the base station through the uplink, or may simultaneously receive data from the base station through the downlink. In addition, the transmitted data can be relayed between the base station and the terminal through the relay station. The quality of communication between a base station, a terminal, and a relay station is primarily related to the quality of the wireless link and the interference experienced. For interference, the same-frequency interference of terminals in other cells received by the base station in the cell is uplink inter-cell interference; the same-frequency interference of the base stations in other cells received by the terminals in the cell is downlink inter-cell interference. The uplink inter-cell interference and the downlink inter-cell interference are collectively referred to as inter-cell interference. If inter-cell interference is severe, the system capacity will be greatly reduced, especially the transmission capacity of the cell edge users will be reduced, thereby affecting the coverage capability of the system and the user's feelings. Therefore, reducing the impact of inter-cell interference on performance is an important goal of cellular system design. However, reducing inter-cell interference is a communication system based on Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Address (OFDMA) technologies. Very difficult and complicated, mainly because the OFDM system is a multi-carrier system, which is very different from the single-carrier technology. For example, in a wireless communication system such as Long Term Evolution (LTE), Ultra Mobile Broadband (UMB), and IEEE 802.16m, radio resources are also divided into frames for management, but each Each OFDMA symbol contains multiple mutually orthogonal subcarriers, and The terminal usually occupies part of the subcarriers, so that technologies such as Fractional Frequency Reuse (FFR) can be used to reduce interference and improve coverage. Second, because the radio channel environment changes frequently, the base station obtains frequency diversity gain and frequency. The selective scheduling gain is used to divide the available physical sub-carriers into physical resource units (PRUs), and then map the physical resource units into a contiguous resource unit (CRU) and a distributed resource unit (Distributed). Resource Unit (referred to as DRU) to improve transmission performance, wherein subcarriers in consecutive resource units are continuous, and subcarriers in distributed resource units are completely discontinuous or incompletely continuous; With increasingly scarce resources, base stations need to support multiple different bandwidths (eg, 5MHz, 10MHz or 20MHz) or multi-carrier operation to take advantage of different frequency resources and meet the needs of different operators. The interference suppression of the uplink is similar to that of the downlink, so only the interference suppression method of the downlink is introduced. At present, from the perspective of inter-cell interference cancellation, the techniques for small-area interference cancellation can be divided into the following three categories: Inter-cell-interference randomization (OFDM) technology, Inter-cell-interference cancellation (Inter-cell-interference cancellation) Inter-cell-interference co-ordination/ avoidance technology. Interference randomization is widely used in the 3rd generation mobile communication (3G) system. The main advantage is that it does not affect the complexity of receiving and receiving processing at the receiving end, and whitens the interference of neighboring cells ( The inter-cell interference is randomized into white noise), so that the interference is reduced by the terminal receiving process. For the downlink channel, the specific methods of interference randomization are base station based scrambling code, base station based interleaved multiple access (IDMA) and megabit technology. The principle of the interference cancellation technique is to eliminate the interference signal between cells by the signal processing mode of the terminal. Since the interference cancellation technique is handled by the receiving end and eliminates the strongest interference in all interfering cells, it has great flexibility. At the same time, since the interference cancellation is processed by the terminal, it is a very effective method in engineering practice, which can effectively eliminate interference and greatly improve the performance of the system and the cell edge. For downlink interference cancellation technology, it mainly refers to interference cancellation based on spatial signal processing; % technology. Interference coordination technology mainly coordinates spatial, temporal and frequency channel resources and power among multiple cells, thereby reducing interference between adjacent cells. Interference coordination technology is a base station based Interference cancellation technology. The downlink interference coordination technology mainly includes interference coordination in the time-frequency domain and interference coordination in the space-time frequency domain, especially the interference coordination technology using multi-antenna technology. Smart antennas and precoding-based beamforming techniques are typical interference coordination techniques. In addition, by setting a specific transmission mode at a specific resource location, it is also possible to reduce system interference. Specifically, between adjacent cells, a part (may be all) of the inter-cell-specific or shared time-frequency resources is divided into multiple sub-sets, and each cell occupies one or more sub-set time-frequency resources for the cell edge. User data and signaling transmission. The time-frequency resource subsets occupied by neighboring cells at the cell edge do not coincide. Time-frequency domain interference coordination generally needs to be combined with power control. For example, for a cell edge terminal, a larger transmission power can be used, and for a cell center user, a lower transmission power needs to be used. For example, the same MIMO mode or the like is enabled at the same physical resource location between base stations that interfere with each other. In existing communication standards, the system's open-loop MIMO mode has been set up between different cells, and resource alignment is used to control interference. The difference between the open loop and the closed loop is: If the information transmission method of Channel State Information (CSI) is completely unknown at the transmitting end, it is called Open-Loop transmission, and there is no information feedback from the receiving end to the transmission. At the end, the power is equally distributed among the antennas at the transmitting end (eg, open-loop spatial multiplexing and Alamouati space-time coding); if the information transmission mode of the CSI is completely or partially known at the transmitting end, it is called closed-loop transmission. The terminal needs to obtain feedback of the downlink channel state from the receiving end to form a feedback channel, and accordingly, the transmission power is adjusted between the data streams, for example, a beamforming technique and a codebook-based precoding technique. The area in which resources are aligned between different cells is called an open-loop area of MIMO, and the cell base station uses the same or similar MIMO feedback mode and transmission mode for the physical resource. However, the technical problems existing in the current MIMO open-loop area are as follows: The power control in the open-loop area is not different from the power control mode in the open-loop area, that is, the transmission power of the resources occupied by the open-loop area is still the same as the channel. The conditions are directly related and are adjusted according to the channel conditions of the terminal. Therefore, the total transmit power in the open loop region cannot be controlled, and the interference level between cells in the MIMO open loop region cannot be achieved.

SUMMARY OF THE INVENTION The present invention provides a power configuration method for a MIMO open loop region capable of effectively controlling interference And means capable of limiting the power in the MIMO open loop region over the entire physical frequency band to provide a stable interference level, control system interference, and thereby improve spectral efficiency at the cell edge. In order to solve the above problem, the present invention provides a power configuration method for a multiple-input multiple-output open-loop region, including: when a base station's available subcarriers are mapped to F frequency partitions, and an i-th frequency partition is set with multiple input and multiple outputs. (MIMO) open-loop region, then the MIMO open-loop region in the i-th frequency partition

+ Δ _Ρί + Δ _2ρ ;

Pout^Pmax; where Δ _Λ · is the power difference between the frequency partition and the frequency partition F ₀ , 0 ≤ < ^ , and ^^ ≥ 1 , P _max is the total of each Orthogonal Frequency Division Multiplexing (OFDM) symbol The maximum value of the transmit power, Pout is the total actual transmit power of each Orthogonal Frequency Division Multiplexing (OFDM) symbol; N _used is the number of available subcarriers within each OFDM symbol; Δ _1ρ and Δ _2ρ are power constraint values, Δ _1ρ and Δ _2ρ are both greater than or equal to zero. When F=l, Δ. = 0, each data subcarrier power p _{2 of the} MIMO open loop region satisfies:

The used method further includes: negotiating between different base stations, so that the MIMO open-loop area needs to meet one or a combination of the following requirements: the same type of MIMO open-loop area between different base stations occupies the same physical resource location and/or quantity And the power constraint values Δ _1ρ and Δ _{2ρ in the} same type of MIMO open-loop region between different base stations are the same. The different base stations refer to different base stations within a cluster, or different base stations within a frequency reuse set. Different base stations negotiate @ι _ρ and/or A _2p through management messages or backhauls. The management message is: a multi-base station MIMO cooperative management message, an inter-base station interference coordination management message, or a neighboring area broadcast management message. The method further includes: the base station notifying the terminal of the power constraint values Δ _1ρ and Δ _2ρ by a broadcast manner or other predefined manner, and the terminal controls the power amplifier of the receiving end according to the Δ _1ρ and/or Δ _{2ρ to} make The amplifier gain matching required to receive the signal. The method further includes: the base station carrying the indication information of the MIMO open loop area to the terminal by using a broadcast control channel or a management message, where the indication information includes one or a combination of the following: a resource type in the MIMO open loop area, and an MIMO open loop The resource location occupied by the region, the number of resources occupied by the MIMO open-loop region, and whether the MIMO open-loop region is enabled. The method further includes the base station indicating that the physical resource of the MIMO open loop area of the terminal is only used to send data. The present invention also provides a power configuration apparatus for a multiple-input multiple-output open-loop region, where the power configuration apparatus is configured to: when a available subcarrier of a base station is mapped to F frequency partitions, and an MIMO open loop is set for the i-th frequency partition In the region, the data subcarrier power p ₂ of the MIMO open loop region in the i-th frequency partition satisfies:

Pout^Pmax; where Δ _Λ · is the power difference between the frequency partition and the frequency partition F ₀ , 0 ≤ < ^ , and ^^ ≥ 1 , P _max is the total of each Orthogonal Frequency Division Multiplexing (OFDM) symbol The maximum value of the transmit power, Pout is the total actual transmit power of each Orthogonal Frequency Division Multiplexing (OFDM) symbol; N _used is the number of available subcarriers within each OFDM symbol; Δ _1ρ and Δ _2ρ are power constraint values, Δ _1ρ and Δ _2ρ are both greater than or equal to zero. The invention provides a power configuration method for effectively controlling the transmission power of a base station and effectively controlling inter-base station interference, thereby reducing the interference of the entire network to a certain level and ensuring the service quality of the cell edge users. And the spectrum efficiency of the whole network.

BRIEF abstract The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. 1 is a schematic diagram of a frame structure of a wireless communication system according to the related art; FIG. 2 is a schematic diagram of an open loop area of a frequency partition according to an embodiment of the present invention; FIG. 3 is a frequency partitioning method according to an embodiment of the present invention. FIG. 4 is a schematic diagram of an open loop area of a plurality of frequency partitions according to an embodiment of the present invention; and FIG. 5 is a schematic diagram of power control of an open loop area when multiple frequency partitions are performed according to an embodiment of the present invention.

A preferred embodiment of the present invention provides a power configuration method for a MIMO open-loop region, including: when a available subcarrier of a base station is mapped to F frequency partitions, and a MIMO open loop region is set for each frequency partition, Each data subcarrier power P2 of the MIMO open loop region within the i frequency partitions satisfies:

10 + Δ _2ρ

Used used

Pout= [pi+101ogio(N _Pl iot)]+ Po-oL+ [p ₂ +101ogio(Ni _-0 L)]

Pout^Pmax where 0 ≤ i < F , F ≥ l , Α _Λ is the frequency partition and the frequency partition F. Power difference, P _max is the maximum value of the total transmit power of each OFDM symbol base station, Pout is the total actual transmit power of each orthogonal frequency division multiplexing (OFDM) symbol; N _used is within each OFDM symbol The number of available subcarriers; Δ _1ρ and Δ _2ρ are power constraint values, and Δ _1ρ and Δ _2ρ are both greater than or equal to zero. Where Δ. = 0 . The number of data subcarriers is N _Data , and the number of symbols of the pilot subcarriers is N _P11 . _t , the power on each pilot subcarrier is dBm, the number of subcarriers outside the open loop region is N _oL and the transmission power is P _oL dBm, and the number of data subcarriers in the open loop region is Νκ and each data subcarrier The power is ρ ₂ dBm. Because Pout is the actual transmit power, p2 satisfies:

Used used

The base station notifies the terminal of the power constraint value Δ _1ρ and by a broadcast method or other predefined manner

The terminal _adjusts the power amplifier of the receiving end according to the constraint value Δ _1ρ and/or Δ _2ρ sent by the base station to match the power amplifier gain required by the received signal, thereby achieving the purpose of energy saving and sensitivity improvement. In addition, the terminal can also perform uplink power control based on Δ _1ρ and/or Δ _{2ρ of the} downlink. Can be divided into two situations:

1) When F=l, that is, when the base station maps all available subcarriers in one subframe to one frequency partition,

Used used

Where ^Δ _1ρ and ^Δ 2 _Ρ are both greater than or equal to 0, and the unit is dB. A _lp is equal to or not equal to A _2p . Preferably, Δ _1ρ = Δ _2ρ = _{3 (} ΐΒ, ie the data subcarrier power is doubled or reduced by a factor of two.

2) When? >1, when the available subcarriers in one subframe are mapped into multiple frequency partitions, each data subcarrier power p ₂ of the MIMO open loop region in the i th frequency partition satisfies:

Used used where each data subcarrier power p ₂ of the MIMO open loop region within the 0th frequency partition satisfies:

Used used

In the case of multiple frequency partitions, Δ _1ρ and Δ _2ρ between different frequency partitions may be the same or different. When the same, the power constraint of the MIMO open-loop area is simple, and the interaction information between the base stations is reduced; When the resource type of the MIMO open-loop region in different frequency partitions is selected, the corresponding Δ _1ρ and

2ρ.

Negotiation between different base stations, so that the MIMO open-loop area needs to meet one or a combination of the following requirements: The same type of MIMO open-loop area between different base stations occupies the same physical resource location and/or number, and the same type between different base stations The power constraint values Δ _1ρ and Δ _{2ρ in the} MIMO open loop region are the same. The different base stations refer to different base stations within a cluster, or different base stations within a frequency reuse set. Different base stations can negotiate through management messages or through backhaul (Backhaul) for background negotiation. The management message may be a multi-base station MIMO cooperative management message, an inter-base station interference coordination management message, or a neighboring area broadcast management message. The method further includes: the base station transmitting the indication information of the MIMO open-loop physical resource to the terminal by using the broadcast control channel or the management message, where the indication information includes one or a combination of the following: a resource type and a backhaul line resource in the MIMO open-loop area. Location, number of resources occupied by the MIMO open-loop region, and whether the MIMO open-loop region is enabled. In addition, the control channel may be located in the open loop area. To ensure effective coverage of the user, the transmit power of the control channel is strictly based on the overall interference and the channel quality of the user. Therefore, in some strong interference environments, in order to ensure the control channel. For efficient transmission, the transmission power is greatly increased, so that the transmission power in the open loop area cannot be controlled to a specific level. In the present invention, in order to ensure the coverage capability of the control channel, the MIMO open-loop physical resource of the terminal is not used for the control channel by using the broadcast control channel or the management message, and is only used for transmitting data, and the control channel includes a physical downlink control channel. . Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. The features in the embodiments and the embodiments of the present application may be combined with each other if they do not conflict. 1 is a schematic diagram of a frame structure of a wireless communication system according to the related art. A radio resource is divided into superframes in a time domain, each superframe includes 4 frames, and each frame includes 8 subframes. (subframe), the subframe is composed of 6 basic OFDMA symbols (symbols), and the actual system determines how many OFDMA symbols are included in each level unit in the frame structure according to factors such as bandwidth to be supported and/or cyclic prefix length of the OFDMA symbol. In addition, the system can Setting a broadcast control channel (Broadcast Control Channel, hereinafter referred to as BCCH) in the first downlink subframe in the superframe (because it is located in the superframe header, also called a superframe header) and transmitting a resource map, etc. System information; and the system can also set up a unicast and/or multicast scheduling (MAP) channel to control the transmission of data. In a communication system, a plurality of different types of resource units can be designed according to the degree of matching of factors such as channel conditions to support different transmission modes. The process of resource mapping is the process of mapping physical resources to different types of logical resources. For example, according to factors such as networking technology, interference suppression technology, and service type, the resource structure divides the bandwidth available in the frequency domain into multiple frequency partitions.

(Frequency Partition, abbreviated as FP), and then divide the frequency resources in the frequency partition into consecutive resource units and/or distributed resource units for scheduling. For example, as shown in FIG. 2, the available physical subcarriers of one subframe are divided into one frequency partition, and each frequency partition is divided into consecutive logical resource units.

(Contiguous Logical Resource Unit, CLRU) and Distributed Logical Resource Unit (DLRU), continuous logical resource units are used for frequency selective scheduling, and distributed logical resource units are used for frequency diversity scheduling.

In the first embodiment of FIG. 2, the available subcarriers are mapped to one frequency partition according to the conditions of the current system, and an open loop region is set on the resource type 2 in order to control interference between different cells. The enabling of the open-loop area is to notify the terminal resource allocation whether to support the use of the open-loop area by setting a signaling "OL Region Enable" in the broadcast control information sent by the base station to the terminal, as shown in Table 1.1. Table 1.1

If OL Region Enable = 1 , it means that the open loop region can be supported, but there is no need for an open loop region. The size of the open loop area can be notified by other broadcast control information. If it is greater than 0, the open loop area of the size is considered to be activated, as shown in Table 1.2. Table 1.2

In order to control the transmission power of the open-loop area, the power control method is as shown in FIG. 3, as follows: For each OFDM symbol, the maximum value of the total transmission power of the base station is P _max =43 dBw, and the actual transmission power value is P. _ut dBw, the total number of subcarriers is 1024, the number after removing the guard subcarriers and the DC subcarriers carrier data Ndata = 864, the number of symbols for the pilot subcarriers of Npilot = 96, if the power of the subcarriers for each pilot Power up on the pilot subcarriers by increasing Boosted by 3 dB relative to the average subcarrier power

The average power of all available subcarriers is: (^^) = 23.09mW

864

When transmitting at full power, the power used for data transmission after removing the pilot power is:

Then the power of each data subcarrier in the open loop region is p ₂ dBmw, and p ₂ satisfies:

15426.33 _{Λ ΛΛ Τ7}

ρ ₇ = =20.09mW

² 864 -96

According to 10 Δ _2ρ , Δ _1ρ and

Δ _2ρ controls the transmission power of the open loop region. For example, A _lp =_3dB , A _2p =0dB. When fully loaded and A _2p =0 dB, Pout = Pmax = 43 dBW. In order to control the transmission power in the open loop region to be lower and more flexible, the initial transmission power of each data subcarrier in the open loop region can be set to 15 mW, and then Δ _1ρ =- can be set at this time. 3άΒ, A _2p =ldB, at this time, the dynamic range of the transmission power of each data subcarrier in the open loop region is 4 dB. Embodiment 2 In FIG. 4, if the entire available subcarrier of the base station is mapped to 4 frequency partitions, if the frequency partition (0<i<4) is relative to F. The power Boosted value is 3dB, -3dB, -3dB, ie:

A _F0 =0dB, A _F1 = 3dB, A _F2 = -3dB, A _F3 = -3dB. If Pout=Pmax=43dBW, if the 10MHz bandwidth is still taken as an example, the available subcarriers are 864, and the size of each frequency partition is the same. Then the subcarrier power in the frequency partition 0 sets the pilot subcarrier power and the data subcarrier power. Equal, for example only, in other embodiments, may also be unequal) power:

Then, the power of the subcarrier power in the frequency partition 1 is equal to the pilot subcarrier power and the data subcarrier power):

23·09·10 ⁽ ^ )=46.18mW The power of the subcarrier power in the frequency partitions 2 and 3 is equal to the pilot subcarrier power and the data subcarrier power):

23.09-10 ^(?) = 11.55mW Since the present embodiment and _Δ Ώ _Δ Ρ2 equal, it is used directly in place of _Δ Ώ _Δ Ρ2 calculated. If the system is not fully loaded, depending on the strength of the interference, each data subcarrier power ρ _{2 of the} open loop region in each frequency partition satisfies:

10 ¹⁰ 10 ¹⁰

10 log [― -—] + Δ _κ -Δ _1ρ <ρ ₂ <10 log [― -—] + Δ _κ + Δ _2ρ For example, each data subcarrier power p ₂ of the MIMO open loop region within frequency partition 0 satisfies:

Each data subcarrier power ρ ₂ of the MIMO open loop region in frequency partition 1 satisfies: ρ ρ

10 ¹⁰ 10 ¹⁰

10 log[ ] + 3-Δ _1ρ ≤ρ ₂ <10 log[ ] + 3 + Δ _2ρ

864 ^{ρ 2} 864 Each data subcarrier power p ₂ of the MIMO open loop region within frequency partition 2 or 3 satisfies:

10 ¹⁰ 10 ¹⁰

10 log[ ] -3-Δ _1ρ ≤ρ ₂ <10 log[ ]— 3 + Δ _2ρ

864 ^{ρ 2} 864 As shown in FIG. 5, similar to the first embodiment, in order to control the transmission power in the open loop region to be lower and more flexible, each data subcarrier in the open loop region can be set. The initial transmit power is 15mW, then Aip and A _2p can be set at this time to adjust the dynamic range of the transmit power of each data subcarrier in the open loop region. For the above four frequency partitions ( 0 < i < 4 ) relative to F. The Boosted value of the power is 3dB, -3dB, -3dB. It should be noted that: For different base stations or cells, these values may be different, which are related to the scheduling and interference of the base station or the cell. For example, cell 0 can be:

A _F0 =0dB, A _F1 =3dB, A _F2 =-3dB, Δ _Ρ3 =-3dB; Cell 1 can be: ie A _FO = odB, A _F1 = -3dB, A _F2 = 3dB, Δ _Ρ 3 = -3dB; Cell 2 is: A _FO = odB, A _F1 = -3dB, A _F2 = -3dB, A _F3 = 3dB. The same type of MIMO open-loop area between different base stations occupies the same physical resources and needs to meet the same Δ _1ρ and Δ _2ρ requirements. The base stations can negotiate or pass management messages.

Backhaul conducts background negotiations. It should be noted that the principle of the above method has no absolute relationship with the system bandwidth. When the system bandwidth changes, the maximum transmit total power Pmax also changes. For example, if the total transmit power of a 10 MHz system is 43 dBmW, the total transmit rate of the 20 MHz system is 46 dBmW, and the total transmit power of the 5 MHz system is 40 dBmW, which can keep the average power of the subcarriers unchanged. The present invention also provides a power configuration apparatus for a multiple-input multiple-output open-loop region, where the power configuration apparatus is configured to: when a available subcarrier of a base station is mapped into F frequency partitions, and a MIMO open loop region is set for each frequency partition When configuring, each data subcarrier power p ₂ of the MIMO open loop region in the i th frequency partition satisfies:

Used used

Where Δ _Λ · is the power difference between the frequency partition and the frequency partition F ₀ , 0 ≤ < ^ , and ^^ ≥ 1 ,

Pmax is the maximum value of the total transmission power of each Orthogonal Frequency Division Multiplexing (OFDM) symbol, N ^ is the number of available subcarriers per OFDM symbol; Δ _1ρ and Δ _2ρ are power constraint values, Δ _1ρ and Δ _2ρ is greater than or equal to zero. The power constraint values Δ _1ρ and Δ _2ρ between different frequency partitions are the same or different. The power configuration apparatus further notifies the terminal of the power constraint values Δ _1ρ and Δ _2ρ by a broadcast manner or other predefined manner. The power configuration device further negotiates with other power configuration devices, so that the MIMO open-loop region needs to meet one or a combination of the following: the physical resource location and/or quantity occupied by the same type of MIMO open-loop region between different base stations. The power constraint values Δ _1ρ and Δ _{2ρ in the} same type of MIMO open-loop region between the same and different base stations are the same. Specifically, the negotiation is performed through a management message or a backhaul line. The power configuration device further carries the indication information of the MIMO open loop area to the terminal by using a broadcast control channel or a management message, where the indication information includes one or a combination of the following: MIMO open loop The resource type in the area, the resource location occupied by the MIMO open-loop area, the number of resources occupied by the MIMO open-loop area, and whether the MIMO open-loop area is enabled. One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial Applicability The present invention provides a power configuration method and apparatus for effectively controlling a base station transmit power, thereby effectively controlling inter-base station interference, thereby reducing interference of the entire network to a specific level and securing services of cell edge users. Quality and spectral efficiency of the entire network.

Claims

Claim

A power configuration method for a multiple input multiple output open loop region, comprising: mapping a available subcarrier of a base station to F frequency partitions, and setting a multiple input multiple output (MIMO) open loop region in the i th frequency partition Then, the data subcarrier power p ₂ of the MIMO open loop region in the i-th frequency partition satisfies:

Pout^Pmax; where Δ _Λ · is the power difference between the frequency partition and the frequency partition F ₀ , 0 ≤ < ^ , and ^^ ≥ 1 , P _max is the total of each Orthogonal Frequency Division Multiplexing (OFDM) symbol The maximum value of the transmit power, Pout is the total actual transmit power of each Orthogonal Frequency Division Multiplexing (OFDM) symbol; N _used is the number of available subcarriers within each OFDM symbol; Δ _1ρ and Δ _2ρ are power constraint values, Δ _1ρ and Δ _2ρ are both greater than or equal to zero.

2. The method of claim 1 wherein: when F = 1, Δ . = 0, each data subcarrier power p _{2 of the} MIMO open loop region satisfies:

Used used

3. The method according to claim 1, wherein the method further comprises: negotiating between different base stations, so that the MIMO open-loop area needs to meet one or a combination of the following requirements: the same type of MIMO open loop between different base stations The location and/or number of physical resources occupied by the area are the same, and the power constraint values Δ _1ρ and Δ _{2ρ in the} same type of MIMO open-loop region between different base stations are the same.

The method according to claim 3, wherein the different base stations refer to different base stations in one cluster, or different base stations in a frequency reuse set.

The method according to any one of claims 1 to 4, wherein different base stations pass management Negotiate or backhaul (backhaul) to negotiate Αι _ρ and / or A _2p .

The method according to claim 5, wherein the management message is: a multi-base station MIMO cooperative management message, an inter-base station interference coordination management message or a neighboring area broadcast management message.

The method according to any one of claims 1 to 4, wherein the method further comprises: the base station notifying the terminal of the power constraint values Δ _1ρ and Δ _2ρ by a broadcast method or other predefined manner, the terminal The power amplifier at the receiving end is modulated according to the Δ _1ρ and / or Δ _{2ρ to} match the power amplifier gain required to receive the signal.

The method according to any one of claims 1 to 4, wherein the method further comprises: the base station carrying the indication information of the MIMO open loop area to the terminal by using a broadcast control channel or a management message, the indication information The one or the combination includes: a resource type in the MIMO open-loop region, a resource location occupied by the MIMO open-loop region, a quantity of resources occupied by the MIMO open-loop region, and whether the MIMO open-loop region is enabled.

The method according to any one of claims 1 to 4, wherein the method further comprises: the base station indicating that the physical resource of the MIMO open loop area of the terminal is only used for transmitting data.

10. A power configuration apparatus for a multiple input multiple output open loop area, configured to: when an available subcarrier of a base station is mapped to F frequency partitions, and an ith open frequency area is set in an i th frequency partition, an i th The data subcarrier power 2 of the MIMO open loop region within the frequency partition satisfies:

Pout^Pmax; where Δ _Λ · is the power difference between the frequency partition and the frequency partition F ₀ , 0 ≤ < ^ , and ^^ ≥ 1 , P _max is the total of each Orthogonal Frequency Division Multiplexing (OFDM) symbol The maximum value of the transmitted power, Pout is per The total actual transmit power of orthogonal frequency division multiplexing (OFDM) symbols; N _used is the number of available subcarriers in each OFDM symbol; Δ _1ρ and Δ _2ρ are power constraint values, and Δ _1ρ and Δ _2ρ are both greater than or equal to 0 .