CN102378335A - Power allocation method and device in multiple input multiple output open loop region - Google Patents

Abstract

The invention discloses a power allocation method and a power allocation device in a multiple input multiple output open loop region. The method comprises that: when the available subcarriers of a base station are mapped to F frequency subregions, and a multiple input multiple output (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 is in accordance with the following condition: Pout is less than or equal to Pmax; wherein detaFi is power difference between a frequency subregion Fi and a frequency subregion F0, i is more than or equal to 0 and less than or equal to F, and the F is more than or equal to 1, the Pmax is the maximum value of the total transmission power of each orthogonal frequency division multiplexing (OFDM) symbol, the Pout is the total actual transmission power of each OFDM symbol; Nused is available subcarrier quantity in each OFDM symbol; and deta1p and deta2p are power constraint values, and are more than or equal to zero. The invention also provides a power allocation device in the multiple input multiple output open loop region. By the method and the device, the interference of the whole network can be reduced to a certain level so that the service quality of cell-edge users and the frequency spectrum efficiency of the whole network are ensured.

Description

The power distribution method and the device in a kind of multiple-input and multiple-output open loop zone

Technical field

The present invention relates to the communications field, multiple-input and multiple-output in a kind of communication system (Multiple Input Multiple Output, MIMO) open loop zone (Open Loop Region, power distribution method OLRegion).

Background technology

In wireless communication system, the base station typically refers in certain area of radio coverage can believe the radio station through the transceiving that mobile switching center and the terminal information of carrying out is transmitted.In practical application, the base station can communicate through Uplink/Downlink and terminal, and wherein, down link is meant the transmission direction of base station to the terminal, and up link is meant the transmission direction of terminal to base station.And data can be sent to the base station simultaneously through up link in a plurality of terminals, also can receive data simultaneously from the base station through down link.In addition, between base station and terminal, can carry out relaying to the data of transmission through relay station.

The quality of the main and Radio Link of the communication quality between base station and terminal, relay station is relevant with the interference that receives.For interference, the same frequency at terminal disturbs in other sub-districts that the base station in this sub-district receives, for disturbing between uplink cells; The same frequency of base station disturbs in other sub-districts that terminal in this sub-district receives, and is descending presence of intercell interference.Interference and descending presence of intercell interference are referred to as presence of intercell interference between uplink cells.If minizone serious interference; The transmittability of power system capacity, particularly Cell Edge User be will greatly reduce, thereby the covering power of system and user's impression had influence on; Therefore, reducing presence of intercell interference is an important goal of cellular system design to Effect on Performance.But; Reduce presence of intercell interference to based on OFDM (Ortogonal Frequency Division Multiplexing; Abbreviate OFDM as) and OFDM (Orthogonal Frequency Division Multiple Address; Abbreviating OFDMA as) communication system of technology is that very difficulty is with complicated, this mainly is because ofdm system is a multicarrier system, has very large different with single-carrier technology.For example; In wireless communication systems such as Long Term Evolution (LongTerm Evolution abbreviates LTE as), Ultra-Mobile Broadband (Ultra Mobile Broadband abbreviates UMB as) and IEEE 802.16m; Though Radio Resource also is divided into frame and manages; But each OFDMA symbol all comprises a plurality of mutually orthogonal subcarriers, and the terminal takies the parton carrier wave usually, thereby can adopt partial frequency multiplexing (Fractional Frequency Reuse; Abbreviate FFR as) etc. technology reduce interference, improve to cover; Secondly, because wireless channel environment changes frequently, the base station is in order to obtain the gain of frequency diversity gain and frequency selective scheduling; The available physical subcarrier is divided into physical resource unit (Physical Resource Unit abbreviates PRU as), and then physical resource unit is mapped as continuous resource unit (Contiguous Resource Unit; Abbreviate CRU as) and distributed resource unit (Distributed Resource Unit; Abbreviate DRU as), to improve transmission performance, wherein; Subcarrier in the continuous resource unit is continuous, and the subcarrier in the distributed resource unit is discontinuous fully or not exclusively continuous; In addition, along with frequency resource is rare day by day, multiple different bandwidth (for example, 5MHz, 10MHz or 20MHz) or multi-carrier operation need be supported in the base station, to utilize different frequency resources and to satisfy the demand of different operators.

The interference inhibition of up link is similar with down link, so only introduce the disturbance restraining method of down link.At present; From the processing of inter-cell interference cancellation mode, the technology of inter-cell interference cancellation can be divided into following three types: interference randomization technology (Inter-cell-interference randomization), interference cancellation techniques (Inter-cell-interference cancellation) and interference coordination technique (Inter-cell-interference co-ordination/avoidance).

Interference randomization is widely used in the 3G system; Major advantage is can not influence the receiving terminal scheduling and receives the complexity of handling; Through interference whitening, reduce interference thereby receive processing, for down channel through the terminal with neighbor cell; The concrete grammar of interference randomization have scrambler based on the base station, based on the interlacing multi-address of base station (Interleave Division Multiple Access, IDMA) and frequency hopping.

The principle of interference cancellation techniques is the interference signal with the minizone, and the signal processing mode through the terminal falls interference eliminated.Because interference cancellation techniques is to be handled by receiving terminal, several interference the strongest in all interfered cells are eliminated, therefore have very big flexibility.Simultaneously, because interference eliminated is based on the terminal and handles, in engineering practice a kind of efficient and simple method therefore; Can effectively eliminate interference; Greatly improve the performance of system and cell edge,, mainly refer to the interference cancellation techniques of handling based on spacing wave for descending interference cancellation techniques.

Interference coordination technique mainly is in a plurality of minizones space, time and frequency channels resource and power to be coordinated, thereby reduces interference among adjacent cells.Interference coordination technique is a kind of interference cancellation techniques based on the base station, and the downlink interference collaboration technology mainly comprises the interference coordination of time-frequency domain and the interference coordination of empty time-frequency domain, especially utilizes the interference coordination technique of multi-antenna technology.Smart antenna and all be typical interference coordination technique based on the beam shaping technology of precoding.In addition, through on specific resource location, the specific transmission pattern is set also can plays the purpose that reduces system interference.Particularly, between neighbor cell, a minizone part (can be whole) proprietary or total running time-frequency resource is divided into a plurality of subclass, each sub-district takies data and the signaling transmission that one or more subclass running time-frequency resources are used for Cell Edge User.Neighbor cell does not overlap at the running time-frequency resource subclass that cell edge takies.Generally speaking the time-frequency domain interference coordination all need combine with power control, like the terminal for cell edge, can adopt bigger transmitted power, and for the user of center of housing estate, then need adopt lower transmitted power.For example, through between the base station of phase mutual interference, on identical physical resource position, launch identical MIMO pattern etc.

In existing communication standard, begun the open loop MIMO pattern of the system that is provided with in different minizones, and resource is alignd and is controlled interference.The difference of open loop and closed loop is: if at the complete unknown channel state information of transmitting terminal (Channel State Information; CSI) information transmission mode is called open loop (Open-Loop) transmission; Have no feedback information to give transmitting terminal from receiving terminal; Power each antenna mean allocation of transmitting terminal (as, Open-Loop Spatial Multiplexing and Alamouati Space Time Coding); If transmitting terminal completely or partially the information transmission mode of known CSI be called closed loop (closed-loop) transmission; Transmitting terminal need obtain the feedback of down channel state from receiving terminal; Constitute feedback channel; Also will between each data flow, adjust transmitting power according to this, for example, beam forming technique and based on the precoding technique of code book.The resource region aligned is called the open loop zone of MIMO between this different districts, and cell base station all uses identical or similar MIMO feedback model and transmission means to this piece physical resource.But the technical problem that present MIMO open loop zone exists mainly contains:

Power control in the open loop zone is compared with the extra-regional power control mode of open loop; There is not difference; The transmitted power that is the occupied resource in open loop zone is still directly related with channel condition, according to the channel condition adjustment at terminal, therefore; Can not play the total transmitting power in the control open loop zone, also can't reach purpose through the interference level of MIMO open loop Region control minizone.

Summary of the invention

The present invention proposes a kind of power distribution method and the device that can effectively control the MIMO open loop zone of interference; Can the power in the MIMO open loop zone on the whole physics frequency band be limited; Thereby a stable interference level is provided; The interference of control system, thereby the spectrum efficiency of raising cell edge.

In order to address the above problem, the invention provides the power distribution method in a kind of multiple-input and multiple-output open loop zone, comprising:

Available subcarrier when the base station is mapped as F frequency partition, and i frequency partition be provided with multiple-input and multiple-output (MIMO) open loop zone, then the regional data subcarrier power p of MIMO open loop in i frequency partition ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p};$

Pout Pmax；

Wherein, Δ _FiBe frequency partition F _iWith frequency partition F ₀The power difference, 0≤i＜F, and F>=1, P _MaxBe the maximum of the total transmitted power of each OFDM (OFDM) symbol, Pout is the total actual transmission power of each OFDM (OFDM) symbol; N _UsedIt is the available subcarrier number in each OFDM symbol; Δ _1pAnd Δ _2pBe power constraint numerical value, Δ _1pAnd Δ _2pAll more than or equal to 0.

Further, said method also can have following characteristics, when F=1, and Δ _F0=0, each data subcarrier power p in MIMO open loop zone ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{2p}.$

Further; Said method also can have following characteristics; Said method also comprises: also hold consultation between different base station, make MIMO open loop zone need to satisfy following one of the requirement or combination: the physical resource position that the MIMO open loop zone of the same type between different base station takies and/or quantity is identical, the power constraint numerical value Δ between different base station in the MIMO open loop zone of same type _1pAnd Δ _2pIdentical.

Further, said method also can have following characteristics, and said different base station is meant the different base station in bunch, perhaps the interior different base station of frequency reuse set.

Further, said method also can have following characteristics, and different base station is through administrative messag or back haul link (backhaul) Δ of holding consultation _1pAnd/or Δ _2p

Further, said method also can have following characteristics, and said administrative messag is: MIMO cooperation management message, inter-station interference coordinating administrative messag or adjacent area broadcast management messages between many base stations.

Further, said method also can have following characteristics, and said method also comprises:

Terminal said power constraint numerical value Δ is notified through broadcast mode or other predefine modes in the base station _1pAnd Δ _2p, said terminal is according to said Δ _1pAnd/or Δ _2pRegulate and control the power amplifier of receiving terminal, make it and receive the power amplifier gain coupling of signal demand.

Further; Said method also can have following characteristics; Said method also comprises; The terminal is given through the indication information that BCCH or administrative messag carry MIMO open loop zone in said base station, and said indication information comprises one of following or combination: the resource quantity that the resource location that the resource type MIMO open loop zone in, MIMO open loop zone occupy, MIMO open loop zone occupy and whether to enable the MIMO open loop regional.

Further, said method also can have following characteristics, and said method comprises that also said base station indicates the physical resource in said MIMO open loop zone, said terminal only to be used to send data.

The present invention also provides the power configuration device in a kind of multiple-input and multiple-output open loop zone; Said power configuration device is used for: the available subcarrier when the base station is mapped as F frequency partition; And when i frequency partition is provided with MIMO open loop zone, i the regional data subcarrier power p of MIMO open loop that frequency partition is interior ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p};$

Pout Pmax；

Wherein, Δ _FiBe frequency partition F _iWith frequency partition F ₀The power difference, 0≤i＜F, and F>=1, P _MaxBe the maximum of the total transmitted power of each OFDM (OFDM) symbol, Pout is the total actual transmission power of each OFDM (OFDM) symbol; N _UsedIt is the available subcarrier number in each OFDM symbol; Δ _1pAnd Δ _2pBe power constraint numerical value, Δ _1pAnd Δ _2pAll more than or equal to 0.

Beneficial effect of the present invention is to propose a kind ofly can effectively control base station transmitting power; And then effectively control the power distribution method in the MIMO open loop zone of inter base station interference; Thereby the interference of the whole network is reduced to specified level, ensures the service quality of Cell Edge User and the spectrum efficiency of the whole network.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the frame structure sketch map according to the wireless communication system of correlation technique;

Open loop area schematic when Fig. 2 is 1 frequency partition;

The power control sketch map in the open loop zone when Fig. 3 is 1 frequency partition;

Open loop area schematic when Fig. 4 is a plurality of frequency partition;

The power control sketch map in the open loop zone when Fig. 5 is a plurality of frequency partition.

Embodiment

The present invention provides the power distribution method in a kind of MIMO open loop zone, comprising:

Available subcarrier when the base station is mapped as F frequency partition, and each frequency partition is provided with MIMO open loop zone, then each the regional data subcarrier power p of MIMO open loop in i frequency partition ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p}$

Pout＝[p ₁+10log ₁₀(N _Pilot)]+P _O-OL+[p ₂+10log ₁₀(N _I-OL)]

Pout Pmax

Wherein, 0≤i＜F, F>=1, Δ _FiBe frequency partition F _iWith frequency partition F ₀The power difference, P _MaxBe the maximum of the total transmitted power in each OFDM symbol base station, Pout is the total actual transmission power of each OFDM (OFDM) symbol; N _UsedIt is the available subcarrier number in each OFDM symbol; Δ _1pAnd Δ _2pBe power constraint numerical value, Δ _1pAnd Δ _2pAll more than or equal to 0.Wherein, Δ _F0=0.Each data subcarrier number is N _Data, the number of symbols of pilot sub-carrier is N _Pilot, the power on each pilot sub-carrier is p ₁DBm, the extra-regional sub-carrier number of open loop is N _O-OLAnd transmitted power is P _O-OLDBm, the data subcarrier number in the open loop zone is N _I-OLAnd each data subcarrier power is p ₂DBm.Because Pout is an actual transmission power, so p2 satisfies:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p}$

Terminal said power constraint numerical value Δ is notified through broadcast mode or other predefine modes in the base station _1pAnd Δ _2p

The constraint numerical value Δ that send according to the base station at the terminal _1pAnd/or Δ _2pThe power amplifier of regulation and control receiving terminal makes it and receives the power amplifier gain coupling of signal demand, thereby reaches the energy-conservation purpose that promotes with sensitivity.In addition, the terminal also can be according to the Δ of down link _1pAnd/or Δ _2pCarry out uplink power control.

Can be divided into two kinds of situation:

1) when F=1, when promptly the base station is mapped as 1 frequency partition with all available subcarriers in the sub-frame,

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{2p}$

Wherein, Δ _1pAnd Δ _2pAll more than or equal to 0, unit is dB.Δ _1pEqual or be not equal to Δ _2p

Preferably, Δ _1p=Δ _2p=3dB, promptly data subcarrier power doubles or reduces by one times.

2) when F＞1, when promptly the available subcarrier in the sub-frame is mapped as a plurality of frequency partition, each the regional data subcarrier power p of MIMO open loop in i frequency partition ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p}$

Wherein, the 0th each regional data subcarrier power p of MIMO open loop that frequency partition is interior ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{2p}$

Under the situation of a plurality of frequency partition, the Δ between the different frequency subregion _1pAnd Δ _2pCan be identical or different.When identical, the power constraint in MIMO open loop zone is simple, and interactive information reduces between the base station; Not simultaneously, can not select corresponding Δ according to the resource type in MIMO open loop zone in the different frequency subregion _1pAnd Δ _2p

Also hold consultation between different base station, make MIMO open loop zone need to satisfy following one of the requirement or combination: the physical resource position that the MIMO open loop zone of the same type between different base station takies and/or quantity is identical, the power constraint numerical value Δ between different base station in the MIMO open loop zone of same type _1pAnd Δ _2pIdentical.Said different base station is meant the different base station in bunch, perhaps the different base station in the frequency reuse set.

Can hold consultation or carry out the backstage through Backhaul (back haul link) and consult through administrative messag between different base station.Said administrative messag can be MIMO cooperation management message, inter-station interference coordinating administrative messag or an adjacent area broadcast management messages between many base stations.

Said method also comprises; The physical resource of MIMO open loop is carried in the base station through BCCH or administrative messag indication information comprises one of following or combination for terminal, said indication information: the resource quantity that the resource type MIMO open loop zone in, back haul link resource location, MIMO open loop zone occupy and whether to enable the MIMO open loop regional.

In addition, control channel might be positioned at the open loop zone, in order to guarantee effective covering of user; The transmitted power of control channel is a strict channel quality according to overall interference and user and fixed; Therefore, at some strong interference environments, in order to guarantee effective transmission of control channel; Transmitted power can increase greatly, thereby makes that the transmitted power in the open loop zone is uncontrollable at a specified level.Among the present invention, in order to ensure the covering power of control channel, the physical resource through BCCH or the said MIMO open loop of administrative messag indicating terminal is not used in control channel, only is used to send data, and said control channel comprises Physical Downlink Control Channel.

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described.If do not conflict, characteristic can make up each other among the application embodiment and the embodiment.

Shown in Figure 1 is frame structure sketch map according to the wireless communication system of correlation technique; Radio Resource is divided into superframe on time domain; Each superframe comprises 4 frames; Each frame comprises 8 sub-frame, and subframe is made up of 6 basic OFDMA symbols, and what OFDMA symbols are the factors such as circulating prefix-length of bandwidth that real system is supported as required and/or OFDMA symbol confirm specifically to comprise in each grade unit in the frame structure; In addition; System can be provided with BCCH (Broadcast Control Channel in first descending sub frame in superframe; BCCH) (owing to be positioned at the superframe head, be also referred to as superframe head (Superframe Header)) and send system information such as resource mapping; And system can also be provided with the transmission that scheduling (MAP) channel of clean culture and/or multicast comes control data.

In communication system, can be according to the Resource Unit of the matching degree of factors such as channel condition being designed number of different types, to support different transmission modes.What the resource mapping process was accomplished is exactly the process that physical resource is mapped as dissimilar logical resources.For example; According to factors such as networking technology, interference mitigation technology and types of service; Resource structures is divided into a plurality of frequency partition (FrequencyPartition with bandwidth available on the frequency domain; Abbreviate FP as), and then the frequency resource in the frequency partition is divided into the continuous resource unit and/or the distributed resource unit is dispatched.For example; As shown in Figure 2, the available physical subcarrier of a sub-frame is divided into 1 frequency partition, and each frequency partition is divided into continuous logic Resource Unit (Contiguous Logical Resource Unit; CLRU) and distributed logic Resource Unit (DistributedLogical Resource Unit; DLRU), the continuous logic Resource Unit is used for frequency selective scheduling, and the distributed logic Resource Unit is used for frequency diversity scheduling.

Embodiment one

Among Fig. 2, according to the condition of current system, available subcarrier is mapped as 1 frequency partition, and, on resource type 2, is provided with the open loop zone in order to control the interference between different districts.The enable pass in open loop zone is crossed in the broadcast control information that the terminal is sent in the base station signaling OL RegionEnable is set, and the notice terminal resource distributes the use of whether supporting the open loop zone, shown in table 1.1.

Table 1.1

If OL Region is Enable=1, expression can be supported the open loop zone, but not necessarily has the open loop zone.Can be through other the size in broadcast control information notice open loop zone, if greater than 0, then think started should size the open loop zone, shown in table 1.2.

Table 1.2

Describe	Size (bit)	Remarks
			OL?Region?Type?0	8 distributed resource units	(resource type 2)

In order to control the transmitted power in open loop zone, its Poewr control method is following:

For each OFDM symbol, the maximum of total transmitted power of base station is P _Max=43dBw, actual transmission power value is P _OutDBw; Total sub-carrier number is 1024; Remove that the data subcarrier number is Ndata=864 behind protection subcarrier and the direct current carrier wave; The number of symbols of pilot sub-carrier is Npilot=96, if the power on each pilot sub-carrier is with respect to average sub-carrier power make progress Boosted (increase) 3dB, then the power p on the pilot sub-carrier ₁=16dBmw.

The average power of all available subcarriers is:

When full power was sent, the power that is used for the data transmission behind the removal pilot power was:

${10}^{\left(\frac{43}{10}\right)}-96*2*\left(\frac{{10}^{\left(\frac{43}{10}\right)}}{864}\right)=15426.33\mathrm{mW}$

Then each the data subcarrier power in the open loop zone is p ₂DBmw, p ₂Satisfy:

$p_2=\frac{15426.33}{864-96}=20.09\mathrm{mW}$

According to,

Δ can be set _1pAnd Δ _2pControl the transmitted power in open loop zone.For example, Δ _1p=-3dB, Δ _2p=0dB.When fully loaded and Δ _2pDuring=0dB, Pout=Pmax=43dBW.

For the lower of the transmission power control in the open loop zone had higher flexibility again, the initial transmission power that can set each data subcarrier in the open loop zone is 15mW, then can set Δ this moment _1p=-3dB, Δ _2p=1dB, the dynamic range of the transmitted power of each data subcarrier is 4dB in the zone of open loop at this moment.

Embodiment two

When if the whole available subcarrier of base station is mapped as 4 frequency partition, if frequency partition F _i(0＜i＜4) are with respect to F ₀Power Boosted value be 3dB ,-3dB ,-3dB, that is:

Δ _F0＝0dB，Δ _F1＝3dB，Δ _F2＝-3dB，Δ _F3＝-3dB。

If Pout=Pmax=43dBW; If be example with the 10MHz bandwidth still, available subcarrier is 864, and each frequency partition size is identical; Then the sub-carrier power in the frequency partition 0 (supposes that pilot sub-carrier power and data subcarrier power equate; Be merely example, in other embodiments, also can be unequal) power be:

$\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{216+216\·{10}^{\left(\frac{{\mathrm{\Δ}}_{F1}}{10}\right)}+216\·{10}^{\left(\frac{{\mathrm{\Δ}}_{F2}}{10}\right)}+216\·{10}^{\left(\frac{{\mathrm{\Δ}}_{F2}}{10}\right)}}=23.09\mathrm{mW}$

Then the power of the sub-carrier power in the frequency partition 1 (supposing that pilot sub-carrier power and data subcarrier power equate) is:

$23.09\·{10}^{\left(\frac{{\mathrm{\Δ}}_{F1}}{10}\right)}=46.18\mathrm{mW}$

The power of the sub-carrier power in the frequency partition 2 and 3 (supposing that pilot sub-carrier power and data subcarrier power equate) is:

$23.09\·{10}^{\left(\frac{{\mathrm{\Δ}}_{F2}}{10}\right)}=11.55\mathrm{mW}$

Because Δ in the present embodiment _F2And Δ _F3Equate, so directly use Δ _F2Replace Δ _F3Calculate.

If system is not under the situation about being fully loaded with, according to the power of disturbing, each data subcarrier power p in the MIMO open loop zone in each frequency partition ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p}$

For example,

Each data subcarrier power p in the MIMO open loop zone in the frequency partition 0 ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]+{\mathrm{\Δ}}_{2p}$

Each data subcarrier power p in the MIMO open loop zone in the frequency partition 1 ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]+3-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]+3+{\mathrm{\Δ}}_{2p}$

Each data subcarrier power p in the MIMO open loop zone in the frequency partition 2 or 3 ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]-3-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\max }}{10}\right)}}{864}\right]-3+{\mathrm{\Δ}}_{2p}$

Similar with embodiment one, for the lower of the transmission power control in the open loop zone had higher flexibility again, the initial transmission power that can set each data subcarrier in the open loop zone is 15mW, then can set Δ this moment _1pAnd Δ _2pRegulate the dynamic range of the transmitted power of each data subcarrier in the open loop zone.

For above-mentioned 4 frequency partition F _i(0＜i＜4) are with respect to F ₀Power Boosted value be 3dB ,-3dB ,-3dB needs explanation: to different base stations or sub-district, this several values maybe be different, and is specifically relevant with the scheduling of base station or sub-district, interference etc.For example,

Sub-district 0 can be:

Δ _F0＝0dB，Δ _F1＝3dB，Δ _F2＝-3dB，Δ _F3＝-3dB；

Sub-district 1 can be:

It is Δ _F0=0dB, Δ _F1=-3dB, Δ _F2=3dB, Δ _F3=-3dB;

Sub-district 2 is:

It is Δ _F0=0dB, Δ _F1=-3dB, Δ _F2=-3dB, Δ _F3=3dB.

The physical resource that the MIMO open loop zone of the same type between different base station takies is identical, and need satisfy identical Δ _1pAnd Δ _2pRequirement can be held consultation through administrative messag between the base station and perhaps carried out the backstage negotiation through Backhaul.

Need to prove, the not absolute relation of the principle of said method and system bandwidth, when system bandwidth changed, the maximum gross power Pmax that sends also can change.For example, if total transmitted power of 10MHz system is 43dBmW, then total transmission rate of 20MHz system then is 46dBmW, and total transmitted power of 5MHz system then is 40dBmW, can keep the average power of subcarrier constant.

The present invention also provides the power configuration device in a kind of multiple-input and multiple-output open loop zone; Said power configuration device is used for: the available subcarrier when the base station is mapped as F frequency partition; And when each frequency partition is provided with MIMO open loop zone, dispose each data subcarrier power p in the MIMO open loop zone in i the frequency partition ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p}$

Wherein, Δ _FiBe frequency partition F _iWith frequency partition F ₀The power difference, 0≤i＜F, and F>=1, P _MaxBe the maximum of the total transmitted power of each OFDM (OFDM) symbol, N _UsedIt is the available subcarrier number in each OFDM symbol; Δ _1pAnd Δ _2pBe power constraint numerical value, Δ _1pAnd Δ _2pAll more than or equal to 0.Power constraint numerical value Δ between the different frequency subregion _1pAnd Δ _2pIdentical or different.

Wherein, said power configuration device is also notified terminal said power constraint numerical value Δ through broadcast mode or other predefine modes _1pAnd Δ _2p

Wherein, Said power configuration device is also held consultation with other power configuration devices, makes MIMO open loop zone need to satisfy following one of the requirement or combination: the physical resource position that the MIMO open loop zone of the same type between different base station takies and/or quantity is identical, the power constraint numerical value Δ between different base station in the MIMO open loop zone of same type _1pAnd Δ _2pIdentical.Particularly, hold consultation through administrative messag or back haul link.

Wherein, Said power configuration device is also given the terminal through the indication information that BCCH or administrative messag carry MIMO open loop zone, and said indication information comprises one of following or combination: the resource quantity that the resource location that the resource type MIMO open loop zone in, MIMO open loop zone occupy, MIMO open loop zone occupy and whether to enable the MIMO open loop regional.

Claims (10)

1. the power distribution method in a multiple-input and multiple-output open loop zone is characterized in that, comprising:

Available subcarrier when the base station is mapped as F frequency partition, and i frequency partition be provided with multiple-input and multiple-output (MIMO) open loop zone, then the regional data subcarrier power p of MIMO open loop in i frequency partition ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p};$

Pout≤Pmax；

Wherein, Δ _FiBe frequency partition F _iWith frequency partition F ₀The power difference, 0≤i＜F, and F>=1, P _MaxBe the maximum of the total transmitted power of each OFDM (OFDM) symbol, Pout is the total actual transmission power of each OFDM (OFDM) symbol; N _UsedIt is the available subcarrier number in each OFDM symbol; Δ _1pAnd Δ _2pBe power constraint numerical value, Δ _1pAnd Δ _2pAll more than or equal to 0.

2. the method for claim 1 is characterized in that,

When F=1, Δ _F0=0, each data subcarrier power p2 in MIMO open loop zone satisfies:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{2p}.$

3. the method for claim 1; It is characterized in that; Said method also comprises: also hold consultation between different base station, make MIMO open loop zone need to satisfy following one of the requirement or combination: the physical resource position that the MIMO open loop zone of the same type between different base station takies and/or quantity is identical, the power constraint numerical value Δ between different base station in the MIMO open loop zone of same type _1pAnd Δ _2pIdentical.

4. method as claimed in claim 3 is characterized in that said different base station is meant the different base station in bunch, perhaps the interior different base station of frequency reuse set.

5. like the arbitrary described method of claim 1 to 4, it is characterized in that different base station is through administrative messag or back haul link (backhaul) Δ of holding consultation _1pAnd/or Δ _2p

6. method as claimed in claim 5 is characterized in that, said administrative messag is: MIMO cooperation management message, inter-station interference coordinating administrative messag or adjacent area broadcast management messages between many base stations.

7. like the arbitrary described method of claim 1 to 4, it is characterized in that said method also comprises:

Terminal said power constraint numerical value Δ is notified through broadcast mode or other predefine modes in the base station _1pAnd Δ _2p, said terminal is according to said Δ _1pAnd/or Δ _2pRegulate and control the power amplifier of receiving terminal, make it and receive the power amplifier gain coupling of signal demand.

8. like the arbitrary described method of claim 1 to 4, it is characterized in that,

Said method also comprises; The terminal is given through the indication information that BCCH or administrative messag carry MIMO open loop zone in said base station, and said indication information comprises one of following or combination: the resource quantity that the resource location that the resource type MIMO open loop zone in, MIMO open loop zone occupy, MIMO open loop zone occupy and whether to enable the MIMO open loop regional.

9. like the arbitrary described method of claim 1 to 4, it is characterized in that said method comprises that also said base station indicates the physical resource in said MIMO open loop zone, said terminal only to be used to send data.

10. the power configuration device in multiple-input and multiple-output open loop zone; It is characterized in that; Said power configuration device is used for: the available subcarrier when the base station is mapped as F frequency partition; And when i frequency partition is provided with MIMO open loop zone, i the regional data subcarrier power p of MIMO open loop that frequency partition is interior ₂Satisfy:

$10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}-{\mathrm{\Δ}}_{1p}\≤p_2\≤10\log \left[\frac{{10}^{\left(\frac{P_{\mathrm{out}}}{10}\right)}}{N_{\mathrm{used}}}\right]+{\mathrm{\Δ}}_{\mathrm{Fi}}+{\mathrm{\Δ}}_{2p};$

Pout≤Pmax；

Wherein, Δ _FiBe frequency partition F _iWith frequency partition F ₀The power difference, 0≤i＜F, and F>=1, P _MaxBe the maximum of the total transmitted power of each OFDM (OFDM) symbol, Pout is the total actual transmission power of each OFDM (OFDM) symbol; N _UsedIt is the available subcarrier number in each OFDM symbol; Δ _1pAnd Δ _2pBe power constraint numerical value, Δ _1pAnd Δ _2pAll more than or equal to 0.

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