CN102006603B

CN102006603B - Transmission power obtaining method and channel quality/interference intensity measuring method and system

Info

Publication number: CN102006603B
Application number: CN200910171731.1A
Authority: CN
Inventors: 刘锟; 鲁照华; 朱登魁; 刘向宇; 刘颖; 方惠英
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-08-28
Filing date: 2009-08-28
Publication date: 2015-05-13
Anticipated expiration: 2029-08-28
Also published as: JP2013503521A; WO2011023033A1; CN102006603A

Abstract

The invention discloses a transmission power obtaining method and a channel quality/interference intensity measuring method and system. The channel quality measuring method is used for measuring the channel quality information in a wireless communication system and comprises the following specific steps: a base station sends a reference signal on a frequency zone through a downlink channel so that a terminal measures the channel quality information of the frequency zone through the reference signal. In the invention, the base station can send the reference signal on each frequency zone through the downlink channel according to the transmission power of each frequency zone so that the terminal measures the channel quality information of each frequency zone through the reference signal and the accuracy of the channel quality information measured by the terminal is improved.

Description

Transmission power obtaining method, channel quality/interference intensity measuring method and system

Technical field

The present invention relates to mobile communication technology field, particularly relate to a kind of transmission power obtaining method, channel quality/interference intensity measuring method and system.

Background technology

In a wireless communication system, base station refers to the equipment into Terminal for service, and base station is communicated with terminal by Uplink/Downlink, and descending or forward direction refers to that the direction of terminal is arrived in base station, up or oppositely refer to the direction of terminal to base station.Multiple terminal can send data by up link to base station simultaneously, also can receive data from base station by down link simultaneously.

In the data transmission system adopting base station scheduling to control, the dispatching distribution of all resources of system is undertaken by base station usually, such as, the resource situation etc. that can use when resource allocation conditions when downlink transfer is carried out in base station and terminal carry out uplink, these are all distributed by base station scheduling.

At OFDM (Orthogonal Frequency Division Multiplexing, referred to as OFDM) in system, when in same community, base station and different terminals carry out downlink data transmission, because these down links are orthogonal, therefore, intra-cell interference can be avoided.But the down link between different districts may not be orthogonal, therefore, each terminal may be subject to the descending interference from other neighbor cell base station, i.e. presence of intercell interference.

Reduce the important goal that the impact of presence of intercell interference on systematic function is cellular system design, if the serious interference of minizone, then power system capacity can be reduced, the covering power of the particularly transmittability of Cell Edge User, and then influential system and the performance of terminal.In order to overcome presence of intercell interference, fractional frequency reuse technology (FractionalFrequency Reuse, referred to as FFR) can be adopted, by the Resourse Distribute of different sub carrier power level to corresponding terminal, to reduce presence of intercell interference intensity.

Fig. 1 is the schematic diagram of the frequency resource allocation mode of adjacent three sectors and the transmitting power limited case of each frequency partition (Frequency Partition, referred to as FP).As shown in Figure 1, the cardinal principle of FFR is:

First, available frequency resources is divided into N (N be greater than zero integer) individual FP, suppose N=4, be divided into [FP by available frequency resources ₁, FP ₂, FP ₃, FP ₄].Wherein, FP ₂, FP ₃, FP ₄frequency re-use factor be 3 (i.e. Reuse3, also referred to as Reuse1/3), FP ₂, FP ₃, FP ₄in frequency resource allocation give a sector in three adjacent sectors, and other two sectors can not use this frequency resource or need to adopt the method limiting the subcarrier transmitting power of this frequency resource to use this frequency resource; FP ₁frequency re-use factor is 1 (i.e. Reuse 1), and three adjacent sectors can use this frequency resource.

Then, each terminal is by measuring the channel quality of each FP (such as, the average signal of each FP and interference and noise ratio SINR, or the interference measure of each FP), to the channel quality information of base station feedback M (M >=1) individual FP to base station.

Finally, base station is terminal distribution resource according to the channel quality information situation of the FP of terminal to report.

According to foregoing description, the channel quality information of each terminal on each FP is only known in base station, could be rationally terminal distribution resource, but in the related, not yet there is a kind of effective method of measurement to obtain the channel quality information of terminal on each FP.

Summary of the invention

In view of this, the invention provides a kind of channel quality measurement scheme, in order to solve the problem that effectively cannot obtain the channel quality information of terminal on each FP in prior art.

According to an aspect of the present invention, provide a kind of signal channel quality measuring method, the method is for measuring the channel quality information in wireless communication system.

Signal channel quality measuring method according to the present invention comprises: base station sends reference signal by down channel on frequency partition, measures the channel quality information of said frequencies subregion to make terminal by this reference signal.

According to another aspect of the present invention, a kind of interference strength method of measurement is provided.

Interference strength method of measurement according to the present invention comprises: base station does not send any information on predetermined running time-frequency resource, and wherein, this predetermined running time-frequency resource comprises one or more symbol in time-domain, and frequency domain comprises the subcarrier on one or more frequency partition; By measuring the signal on above-mentioned predetermined running time-frequency resource, terminal obtains the interference strength on above-mentioned one or more frequency partition.

According to a further aspect of the invention, provide a kind of transmission power obtaining method, the method is used for the transmitting power configuration information that terminal obtains frequency partition.

Transmission power obtaining method according to the present invention comprises: the transmitting power configuration information of frequency partition is informed to terminal by down channel by base station.

According to a further aspect of the invention, a kind of channel quality measurement system is provided.

Channel quality measurement system according to the present invention comprises: base station and terminal.Wherein, base station, for sending reference signal by down channel on frequency partition; Terminal, for receiving reference signal, and according to the channel quality information of reference signal measuring frequency subregion.

According to a further aspect of the invention, a kind of interference strength measuring system is provided.

Interference strength measuring system according to the present invention comprises: base station and terminal.Wherein, base station, for not sending any content on predetermined running time-frequency resource, to make base station receive only signal from other base stations except base station as the terminal of serving BS on predetermined running time-frequency resource, wherein, predetermined running time-frequency resource comprises one or more symbol in time-domain, and frequency domain comprises the subcarrier on one or more frequency partition; Terminal, for measuring the signal on predetermined running time-frequency resource, obtains the interference strength on one or more frequency partition.

According to another aspect of the present invention, provide a kind of transmitting power and obtain system.

Obtain system according to transmitting power of the present invention to comprise: base station and terminal.Wherein, base station, for informing to terminal by down channel by the transmitting power configuration information of frequency partition; Terminal, for receiving the notice that base station sends, and obtains the transmitting power configuration information of frequency partition according to notice.

By at least one scheme above-mentioned of the present invention, base station sends reference signal by down channel according to the transmitting power of each FP on each FP, to make terminal by reference to the channel quality information of each frequency partition of signal measurement, thus the accuracy of the channel quality information that terminal is measured can be improved.

Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of the frequency resource allocation method of adjacent sectors in prior art and the transmitting power limited case of each frequency partition;

Fig. 2 is the flow chart of the signal channel quality measuring method according to the embodiment of the present invention;

Fig. 3 is the flow chart of the interference strength method of measurement according to the embodiment of the present invention;

Fig. 4 is the flow chart obtained according to the transmitting power of the embodiment of the present invention;

Fig. 5 is the frame structure schematic diagram of a 802.16m system in the embodiment of the present invention;

Fig. 6 is the FP division of 802.16m system base station of three adjacent sectors after enable FFR in the embodiment of the present invention and the schematic diagram of power configuration situation;

Fig. 7 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment one;

Fig. 8 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment two;

Fig. 9 is structure and the flow chart of data processing figure of the system adopting MIMO technology and precoding technique;

Figure 10 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment three;

Figure 11 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment four;

Figure 12 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment five;

Figure 13 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment six;

Figure 14 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment seven;

Figure 15 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment eight;

Figure 16 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment nine;

Figure 17 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment ten;

Figure 18 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment 11;

Figure 19 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment 12;

Figure 20 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment 13;

Figure 21 is the schematic diagram of each frequency partition transmission reference signal of each base station in embodiment 14.

Embodiment

Functional overview

When adopting fractional frequency reuse, in order to give corresponding terminal by the Resourse Distribute of different sub carrier power level, first base station needs the channel quality information obtaining each frequency partition that terminal is measured, in embodiments of the present invention, provide a kind of signal channel quality measuring method, the method is for measuring the channel quality information in wireless communication system.In embodiments of the present invention, base station sends reference signal by down channel on frequency partition, wherein, base station sends the transmitting power of the transmitting power of reference signal and this frequency partition (such as on each frequency partition, average transmit power) corresponding, terminal carries out the measurement of channel quality by this reference signal, thus can improve the accuracy of the channel quality information of measurement.

When not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.

At present, terminal is measured the channel quality information of each frequency partition, and for the different frequency partition of transmitting power, the transmitting power of the intermediate pilot signal that base station sends is all identical, thus the channel quality information making terminal measurement obtain is not accurate enough, for this problem, embodiments provide three kinds of schemes.Wherein, the first scheme is that base station sends reference signal to terminal on frequency partition, and by this reference signal, terminal can the channel quality information of measuring frequency subregion; First scheme is that the serving BS of terminal does not send any content on the scheduled time territory of the pre-subcarrier of one or more frequency partition, to make terminal receive only signal from other base station on this running time-frequency resource, thus the interference strength on above-mentioned one or more frequency partition can be obtained; Third program is base station other indication information of transmit power levels to the one or more frequency partition of terminal notification, with the transmitting power configuration making terminal obtain each frequency partition.Respectively these three kinds of methods are described below.

According to the embodiment of the present invention, provide firstly a kind of signal channel quality measuring method, the method is for measuring the channel quality in wireless communication system.

Fig. 2 is the flow chart of the signal channel quality measuring method according to the embodiment of the present invention, as shown in Figure 2, mainly comprises the following steps (step S201-step S203) according to the signal channel quality measuring method of the embodiment of the present invention:

Step S201: base station sends reference signal by down channel on one or more frequency partition, wherein, this reference signal is used for the channel quality information that terminal measures this one or more frequency partition;

Particularly, base station needs, in the set of frequency partition, which frequency partition sends above-mentioned reference signal and can be determined by this base station, also can be determined by upper layer network element and inform this base station, or, also can determine according to standard default configuration in advance.Wherein, above-mentioned upper layer network element can be one of following network element: base station, trunking, base station controller, access service network, connection service network, core net, core network gateway etc.

Particularly, terminal need the channel quality information measured comprise following one of at least: received signal strength indicator information, interference measure; Signal and interference and noise ratio (SINR); Signal to noise ratio; Signal and noise ratio; Spectrum efficiency; And other measured value relevant with channel quality.

In a particular application, the content of the above-mentioned reference signal that base station sends and structure are that base station and terminal are known, content and structure that this reference signal can be determined by holding consultation with terminal in advance in concrete base station, or the content of this reference signal and structure also can by standard configurations.Further, in a particular application, this reference signal can be a kind of pilot frequency sequence (such as, intermediate pilot), if employing intermediate pilot, the Sequence composition of intermediate pilot can by standard configuration, and terminal obtains the channel quality information on each frequency partition by measurement intermediate pilot.

Particularly, above-mentioned reference signal can send by base station in the specific subcarrier of above-mentioned one or more frequency partition, this specific subcarrier can be determined by base station, also can be determined by upper layer network element and notify described base station, or, also can according to standard default configuration in advance, equally, above-mentioned upper layer network element also can be one of following network element: base station, trunking, base station controller, access service network, connection service network, core net, core network gateway etc.

Particularly, the transmitting power that base station sends above-mentioned reference signal in the specific subcarrier of above-mentioned one or more frequency partition is determined according to the transmitting power (i.e. the average transmit power of the subcarrier of each frequency partition) of each frequency partition, particularly, the transmitting power of certain frequency partition is higher, and the transmitting power that base station sends reference signal in the specific subcarrier of this frequency partition is higher.

Preferably, base station in the specific subcarrier of each frequency partition, send the transmitting power of reference signal can be identical with the transmitting power of the data subcarrier of this frequency partition; Or the transmitting power that base station sends the transmitting power of reference signal and the data subcarrier of this frequency partition in the specific subcarrier of each frequency partition keeps the transmit power differences determined.

Step S201: terminal receives above-mentioned reference signal, obtains the channel quality information of above-mentioned one or more frequency partition by measuring this reference signal.

According to the embodiment of the present invention, additionally provide a kind of interference strength method of measurement.

Fig. 3 is the flow chart of the interference strength method of measurement according to the embodiment of the present invention, as shown in Figure 3, mainly comprises the following steps (step S301-step S303) according to the interference strength method of measurement of the embodiment of the present invention:

Step S301: base station does not send any content on predetermined running time-frequency resource, on this running time-frequency resource, from other base stations except this base station signal is received only to make terminal, wherein, predetermined running time-frequency resource comprises one or more symbol in time-domain and forms, and frequency domain comprises the subcarrier on one or more frequency partition;

Step S303: by measuring the signal on above-mentioned predetermined running time-frequency resource, terminal obtains the interference strength on above-mentioned one or more frequency partition.

Wherein, above-mentioned terminal is with above-mentioned base station be serving BS a terminal or one group of terminal.Because the serving BS of terminal does not send any signal on above-mentioned predetermined running time-frequency resource, therefore, it is signal from other base stations that terminal receives signal on this running time-frequency resource, and by measuring this signal, terminal can obtain the interference strength of corresponding frequency partition.

Particularly, above-mentioned predetermined running time-frequency resource can be determined by this serving BS, also can be determined by upper layer network element and inform this serving BS, or, also can determine according to standard default configuration.Wherein, above-mentioned upper layer network element can be one of following network element: base station, trunking, base station controller, access service network, connection service network, core net, core network gateway etc.

In specific implementation process, the above-mentioned predetermined running time-frequency resource that different base station is corresponding on identical frequency partition can be identical, also can not be identical, and preferably, the above-mentioned predetermined running time-frequency resource that different base station is corresponding on identical frequency partition is not identical.

According to the embodiment of the present invention, additionally provide transmission power obtaining method, the method is used for the transmitting power configuration that terminal obtains frequency partition.

Fig. 4 is the flow chart of the transmission power obtaining method according to the embodiment of the present invention, as shown in Figure 4, mainly comprises the following steps (step S401-step S403) according to the transmission power obtaining method of the embodiment of the present invention:

Step S401: base station is by the transmitting power configuration information notification terminal of down channel by one or more frequency partition.

Wherein, above-mentioned one or more frequency partition can be part or all of frequency partition in the set of frequency partition.

In specific implementation process, base station can the transmitting power configuration information of the above-mentioned one or more frequency partition of notification terminal in the following ways:

(1) the transmitting power configuration information of above-mentioned one or more frequency partition carries and sends to terminal in the signaling by base station, particularly, the absolute value of the transmitting power of each frequency partition can be comprised in this transmitting power configuration information, also using the transmitting power of one of them frequency partition as with reference to power, configuration information can be joined in this transmitting power and comprises the absolute value of this reference power and the Relative transmission power value of other each frequency partition relative to this transmitting power;

(2) in base station and terminal, prestore the transmitting power configuration index table of frequency partition, have recorded each transmitting power configuration information of each frequency partition in the set of frequency partition according to index information in this concordance list, base station is when the transmitting power configuration information of the above-mentioned one or more frequency partition of notification terminal, index information corresponding for the transmitting power configuration information of the above-mentioned one or more frequency partition in this concordance list is sent to terminal, terminal is according to the instruction of this index information, obtain the position of transmitting power configuration information in this concordance list of above-mentioned one or more frequency partition, thus get the transmitting power configuration information of above-mentioned one or more frequency partition,

(3) base station sends to terminal and presets signaling, and terminal, according to the corresponding relation of the transmitting power configuration information of the default signaling prestored and frequency partition, obtains the transmitting power configuration information of the frequency partition corresponding with receiving default signaling.

Wherein, above-mentioned default signaling comprises one of following: the auxiliary leading identification information (SecondAdvanced Preamble Index, referred to as SA-Preamble Index) of the identifying information (IDCell) of base station, the identifying information (SegmentID) of sector, evolution.

Wherein, above-mentioned corresponding relation refers to the corresponding relation between the transmitting power configuration information of default signaling and above-mentioned one or more frequency partition, and terminal presets signaling and the transmitting power configuration information that can obtain above-mentioned one or more frequency partition according to this corresponding relation by receiving.

In specific implementation process, the above-mentioned corresponding relation of terminal storage can be standard default configuration, also can be determine in advance and after holding consultation between base station.

Step S403: terminal receives the notice that base station sends, obtains the transmitting power configuration information of above-mentioned one or more frequency partition according to this notice.

Corresponding with above-mentioned three kinds of methods, embodiments provide three kinds of systems, be respectively used to realize above-mentioned three kinds of methods.Below be described respectively.

According to the embodiment of the present invention, additionally provide a kind of channel quality measurement system.

Channel quality measurement system according to the embodiment of the present invention comprises: base station and terminal, and wherein, base station, for sending reference signal by down channel on frequency partition; Terminal, for receiving above-mentioned reference signal, and measures the channel quality information of said frequencies subregion according to this reference signal.

According to the embodiment of the present invention, additionally provide a kind of interference strength measuring system.

Interference strength measuring system according to the embodiment of the present invention comprises: base station and terminal, wherein, base station, for not sending any content on predetermined running time-frequency resource, to make this base station receive only signal from other base stations except this base station as the terminal of serving BS on above-mentioned predetermined running time-frequency resource, wherein, predetermined running time-frequency resource comprises one or more symbol in time-domain and forms, and frequency domain comprises the subcarrier on one or more frequency partition; Terminal, for measuring the signal on above-mentioned predetermined running time-frequency resource, obtains the interference strength on above-mentioned one or more frequency partition.

According to the embodiment of the present invention, a kind of transmitting power is also provided to obtain system.

Obtain system according to the transmitting power of the embodiment of the present invention to comprise: base station and terminal.Wherein, base station, for informing to terminal by down channel by the transmitting power configuration information of frequency partition; Terminal, for receiving above-mentioned notice, and obtains the transmitting power configuration information of said frequencies subregion according to this notice.

For understanding the technique scheme that the embodiment of the present invention provides further, below by specific embodiment, the technical scheme that the embodiment of the present invention provides is described.

Below in embodiment, be described for the FP of the base station of three adjacent sectors shown in the frame structure shown in Fig. 5 and Fig. 6 division and power configuration situation.

Fig. 5 is the frame structure schematic diagram of a 802.16m system, and as shown in Figure 5, a superframe (Superframe) is 20ms, comprises 4 frames (Frame).A frame is 5ms, comprises 8 subframes (Subframe).A subframe comprises K OFDM symbol (Symbol), and in the present embodiment, K is 6.An OFDM symbol comprises N (N >=1) individual subcarrier (Subcarrier) on frequency domain.And N number of subcarrier can be divided into M frequency partition (FrequencyPartition).Suppose in the present embodiment that M is 4, be divided into 4 FP, i.e. FP1, FP2, FP3 and FP4 by N number of subcarrier.

Fig. 6 is the base station BS 1 of 802.16m system three adjacent sectors after enabling FFR, the FP of BS2, BS3 divides and the schematic diagram of power configuration situation.As shown in Figure 6, first frequency resource is divided into four FP, wherein the frequency re-use factor of FP2, FP3, FP4 is the frequency re-use factor of Reuse1/3, FP1 is Reuse1.[FP in BS1 ₁, FP ₂, FP ₃, FP ₄] average subcarrier transmitting power be [P _reuse1, P _high, P _low1, P _low2], [FP in BS2 ₁, FP ₂, FP ₃, FP ₄] average subcarrier transmitting power be [P _reuse1, P _low2, P _high, P _low1], [FP in BS3 ₁, FP ₂, FP ₃, FP ₄] average subcarrier transmitting power be [P _reuse1, P _low1, P _low2, P _high].The present embodiment, [FP in BS1 ₁, FP ₂, FP ₃, FP ₄] average subcarrier transmitting power be [P ₀, P ₀, P ₀/ 2, P ₀/ 2], [FP in BS2 ₁, FP ₂, FP ₃, FP ₄] average subcarrier transmitting power be [P ₀, P ₀/ 2, P ₀, P ₀/ 2], [FP in BS3 ₁, FP ₂, FP ₃, FP ₄] average subcarrier transmitting power be [P ₀, P ₀/ 2, P ₀/ 2, P ₀].

Embodiment one

In the present embodiment, with the example of single antenna, the above-mentioned first method that the embodiment of the present invention provides is described.

In the present embodiment, after FFR is enable, base station is by sending the channel quality information of reference signal for terminal measurement FP, terminal will measure the channel quality information feedback of FP that obtains to base station, and base station is terminal distribution resource according to the feedback information received and the terminal related information that stored.

Wherein, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, and the cycle sending reference signal can be identical or different, suppose in the present embodiment that BS1, BS2, BS3 utilize last OFDM symbol of the subframe SF2 in identical superframe in same number of frames (Subframe2) (i.e. the 6th OFDM symbol) to send reference signal, as shown in Figure 7, the sub-carrier positions that specifically takies of reference signal is as the subcarrier SC1 to SC8 of black bars in Fig. 7.The transmitting power that BS1, BS2, BS3 transmission reference signal takies subcarrier needs to be configured according to the average subcarrier power of corresponding base station on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 and SC2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1orSC2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1orSC2, BS1}represent the transmitting power of SC1 and SC2, Δ _{1, BS1}represent P _{sC1orSC2, BS1}float factor, namely reflection allow P _{sC1orSC2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC3 and SC4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC3orSC4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC5 and SC6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC5orSC6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC7 and SC8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC7orSC8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1orSC2, BS1}=P ₀, P _{sC3orSC4, BS1}=P ₀, P _{sC5orSC6, BS1}=P ₀/ 2, P _{sC7orSC8, BS1}=P ₀/ 2.

Equally, suppose that the transmitting power of BS2 sub-carriers SC1-SC8 is P _{sC1orSC2, BS2}=P ₀, P _{sC3orSC4, BS2}=P ₀/ 2, P _{sC5orSC6, BS2}=P ₀, P _{sC7orSC8, BS2}=P ₀/ 2

Equally, suppose that the transmitting power of BS3 sub-carriers SC1-SC8 is P _{sC1orSC2, BS3}=P ₀, P _{sC3orSC4, BS3}=P ₀/ 2, P _{sC5orSC6, BS3}=P ₀/ 2, P _{sC7orSC8, BS3}=P ₀

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 6th OFDM symbol of subframe SF2 (Subframe2) sends reference signal, terminal MS 1 measures the channel quality information on subcarrier SC1 to SC8, feeds back the channel quality information of specific FP to BS1.Wherein, specific FP can select also reporting base station BS1, this specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

While base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC8 of the 6th OFDM symbol of subframe SF2 to send reference signal, also can send data message with other available subcarriers on this symbol; Or while base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC8 of the 6th OFDM symbol of subframe SF2 to send reference signal, on this symbol, other subcarriers do not send content;

Particularly, base station BS 1, BS2, BS3 can utilize whole available subcarriers of the 6th of subframe SF2 the OFDM symbol to send reference signal;

It should be noted that, the transmission position of reference signal is not limited in the 6th OFDM symbol of the subframe SF2 chosen in the present embodiment, also can be positioned at other symbols, also can be positioned at other descending sub frames, also can be positioned at multiple OFDM symbol.

In addition, in 802.16m system, reference signal can make the more accurate of the channel quality measurement of FP in conjunction with intermediate pilot (Midamble).Terminal MS 1 obtains the channel matrix of FP by measuring intermediate pilot, and by the channel quality information that measuring reference signals SC1 to SC8 obtains FP, feeds back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Wherein, intermediate pilot (Midamble) refers to the specific pilot sequence that special symbol in a frame sends, be used for carrying out channel measurement at receiving terminal, the transmission cycle of intermediate pilot is 1 frame, and the transmitting power of all subcarriers that intermediate pilot takies is identical.Use intermediate pilot can estimate the channel of all sub-carrier positions on whole symbol.

Embodiment two

In the present embodiment, be described for single antenna.

Wherein, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, comprises pilot reference signal and data reference signal.In the present embodiment, the transmission cycle of reference signal is identical, BS1, BS2, BS3 utilize last OFDM symbol of subframe SF2 (Subframe2) in same number of frames in identical superframe (the 6th OFDM symbol) to send reference signal, as shown in Figure 5, P1 is the pilot reference signal of BS 1, P2 is the pilot reference signal of BS2, P3 is the pilot reference signal of BS3, the transmitting power of P1, P2, P3 subcarrier is identical, and the sub-carrier positions that data reference signal specifically takies is as the subcarrier SC1 to SC8 of black bars in Fig. 8.The transmitting power that BS1, BS2, BS3 transmission data reference signal takies subcarrier needs to be configured according to the average subcarrier power of corresponding base station on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 and SC2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1orSC2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1orSC2, BS1}represent the transmitting power of SC1 and SC2, Δ _{1, BS1}represent P _{sC1orSC2, BS1}float factor, namely reflection allow P _{sC1orSC2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC3 and SC4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC3orSC4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC5 and SC6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC5orSC6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC7 and SC8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC7orSC8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1orSC2, BS1}=P ₀, P _{sC3orSC4, BS1}=P ₀, P _{sC5orSC6, BS1}=P ₀/ 2, P _{sC7orSC8, BS1}=P ₀/ 2.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 6th OFDM symbol of subframe SF2 (Subframe2) sends reference signal, terminal MS 1 measurement pilot frequency reference signal P1 obtains the channel matrix of FP, and by the channel quality information that measurement data reference signal SC1 to SC8 obtains FP, feed back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Further, in the present embodiment, base station BS 1 sends on the subcarrier of pilot reference signal P2 at BS2 and does not send data, and base station BS 1 sends on the subcarrier of pilot reference signal P3 at BS3 and do not send data.Base station BS 1 can utilize other available subcarriers on the symbol of transmission reference signal send data message or do not send data message.In like manner, identical process can be adopted for base station BS 2 and BS3.

Base station BS 1, BS2, BS3 can utilize whole available subcarriers of the 6th of subframe SF2 the OFDM symbol to send reference signal;

It should be noted that, the transmission position of reference signal is not limited in the 6th OFDM symbol of the subframe SF2 chosen in the present embodiment, also can be positioned at other OFDM symbol, also can be positioned at other descending sub frames, also can be positioned at multiple OFDM symbol.

Embodiment three

The present embodiment is described for multiple antennas.

In the present embodiment, system employs MIMO technique (Multiple-InputMultiple-Output, referred to as MIMO) and precoding technique (Precode), the structure of this system and flow chart of data processing are as shown in Figure 9, first data to be sent are divided into L (L >=1) individual layer (layer), then the data of this L layer are sent into MIMO encoder (MIMO encoder), generate Mt (Mt >=L) individual data flow (Stream), again this Mt Stream is sent into precoder (Precoder), data-mapping the most to be sent sends to Nt antenna (Antenna) is upper.

Wherein, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, and the cycle of transmission can be identical or different.Suppose in the present embodiment that BS1, BS2, BS3 utilize last OFDM symbol of the subframe SF2 in identical superframe in same number of frames (Subframe2) (the 6th OFDM symbol) to send reference signal.

The process of transmitting of reference signal is specifically described below for BS1.

First reference signal after modulating-coding is divided into L layer by BS1, generates M after then the data of L layer being sent into MIMO encoder _tindividual Stream, then by this M _tindividual Stream sends into Precoder, and final Reference Signal is mapped to N _tindividual antenna (Antenna) is upper to be sent.Wherein, the processing procedure of Precoder works as M _tafter individual Stream sends into Precoder, PM-a from known pre-coding matrix Resource selection pre-coding matrix PM-a, and is multiplied by M by base station _tindividual Stream, is mapped to N by result _tindividual antenna (Antenna) is upper to be sent.Wherein, base station can be configured by standard default when selecting pre-coding matrix PM-a, or base station Stochastic choice and the PMI sequence number notification terminal of PM-a that will select.

As shown in Figure 10, reference signal is at N _tindividually (in the present embodiment, suppose N _t=2) antenna (Antenna) is upper sends, and the sub-carrier positions specifically taken is as the subcarrier SC1 to SC16 of the square with filling in Figure 10.The transmitting power that BS1 transmission reference signal takies subcarrier needs to be configured according to the average subcarrier power of BS1 on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 to SC4 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1-SC4, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1-SC4, BS1}represent the transmitting power of SC1, SC2, SC3, SC4, Δ _{1, BS1}represent P _{sC1-SC4, BS1}float factor, namely reflection allow P _{sC1-SC4, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC5 to SC8 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC5-SC8, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC9 and SC12 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC9-SC12, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC13 and SC16 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC13-SC16, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1-SC4, BS1}=P ₀, P _{sC5-SC8, BS1}=P ₀, P _{sC9-SC12, BS1}=P ₀/ 2, P _{sC13-SC16, BS1}=P ₀/ 2.

Equally, suppose that the transmitting power of BS2 sub-carriers SC 1-SC 16 is P _{sC1-SC4, BS2}=P ₀, P _{sC5-SC8, BS2}=P ₀/ 2, P _{sC9-SC12, BS2}=P ₀, P _{sC13-SC16, BS2}=P ₀/ 2

Equally, suppose that the transmitting power of BS3 sub-carriers SC1-SC16 is P _{sC1-SC4, BS3}=P ₀, P _{sC5-SC8, BS3}=P ₀/ 2, P _{sC9-SC12, BS3}=P ₀/ 2, P _{sC13-SC16, BS3}=P ₀

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 6th OFDM symbol of subframe SF2 (Subframe2) sends reference signal, terminal MS 1 measures the channel quality information on subcarrier SC1 to SC16, feeds back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

While base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC16 of the 6th OFDM symbol of subframe SF2 to send reference signal, also can send data message with other available subcarriers on this symbol; Or while base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC16 of the 6th OFDM symbol of subframe SF2 to send reference signal, on this symbol, other subcarriers do not send content;

In addition, in 802.16m system, reference signal can make the more accurate of the channel quality measurement of FP in conjunction with intermediate pilot (Midamble).Terminal MS 1 obtains the channel matrix of FP by measuring intermediate pilot, and by the channel quality information that measuring reference signals SC1 to SC16 obtains FP, feeds back the channel quality information of specific FP to BS1.Wherein, this specific FP can select also reporting base station BS1, this specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Embodiment four

This embodiment is described for multiple antennas.

In this first draft example, after FFR is enable, base station is by sending the channel quality information of reference signal for terminal measurement FP, terminal will measure the channel quality information feedback of FP that obtains to base station, and base station is terminal distribution resource according to the feedback information received and the terminal related information that stored.

In the present embodiment, the system structure also used as shown in Figure 9 is flow chart of data processing, and wherein, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, sends the cycle identical.Suppose in the present embodiment that BS1, BS2, BS3 utilize last OFDM symbol of the subframe SF2 in identical superframe in same number of frames (Subframe2) (the 6th OFDM symbol) to send reference signal.

First reference signal after modulating-coding is divided into L layer by BS1, generates M after then the data of this L layer being sent into MIMOencoder _tindividual Stream, then by this M _tindividual Stream sends into Precoder, and final Reference Signal is mapped to N _tindividual antenna (Antenna) is upper to be sent.Wherein, the processing procedure of Precoder works as M _tafter individual Stream sends into Precoder, pre-coding matrix index (Precode MatrixIndication, referred to as PMI) is passed through from known pre-coding matrix Resource selection pre-coding matrix PM-a in base station, and PM-a is multiplied by M _tindividual Stream, is mapped to N by result _tindividual antenna (Antenna) is upper to be sent.Wherein, base station can be configured by standard default when selecting pre-coding matrix PM-a, or base station Stochastic choice and the PMI sequence number notification terminal of PM-a that will select.

Reference signal is at N _tindividually (in the present embodiment, suppose N _t=2) as shown in figure 11, wherein, reference signal comprises pilot reference signal and data reference signal to the sub-carrier positions that on antenna (Antenna), transmission specifically takies.Wherein P1-1 is the pilot reference signal of the antenna 1 of BS 1, and P1-2 is the pilot reference signal of the antenna 2 of BS1, and the pilot reference signal of BS1, BS2 and BS3 adopts the mode of frequency division multiplexing.The subcarrier SC1 to SC16 of black bars is data reference signal.The transmitting power that BS1 transmission data reference signal takies subcarrier needs to be configured according to the average subcarrier power of BS1 on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 to SC4 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1-SC4, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1-SC4, BS1}represent the transmitting power of SC1, SC2, SC3, SC4, Δ _{1, BS1}represent P _{sC1-SC4, BS1}float factor, namely reflection allow P _{sC1-SC4, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC5 to SC8 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC5-SC8, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC9 and SC12 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC9-SC12, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC13 and SC16 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC13-SC16, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1-SC4, BS1}=P ₀, P _{sC5-SC8, BS1}=P ₀, P _{sC9-SC12, BS1}=P ₀/ 2, P _{sC13-SC16, BS1}=P ₀/ 2.

Equally, suppose that the transmitting power of BS2 sub-carriers SC1-SC16 is P _{sC1-SC4, BS2}=P ₀, P _{sC5-SC8, BS2}=P ₀/ 2, P _{sC9-SC12, BS2}=P ₀, P _{sC13-SC16, BS2}=P ₀/ 2

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 6th OFDM symbol of subframe SF2 (Subframe2) sends reference signal, terminal MS 1 measurement pilot frequency reference signal P1-1, P1-2 obtain the channel matrix of FP, and by the channel quality information that measurement data reference signal SC1 to SC16 obtains FP, feed back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Base station BS 1 sends on the subcarrier of pilot reference signal P2 at BS2 and does not send data, and base station BS 1 sends on the subcarrier of pilot reference signal P3 at BS3 and do not send data.Base station BS 1 can utilize other available subcarriers on the symbol of transmission reference signal send data message or do not send data message.In like manner, identical process can be performed for base station BS 2 and BS3.

Embodiment five

The present embodiment is described for single antenna.

In the present embodiment, base station utilizes intermediate pilot to send reference signal, in 802.16m system, intermediate pilot (Midamble) refers to and special symbol in a frame sends specific pilot frequency sequence, be used for carrying out channel measurement at receiving terminal, such as in the penultimate subframe of descending sub frame (in the present embodiment for subframe SF3) first OFDM symbol on send intermediate pilot, and the transmission cycle of intermediate pilot is 1 frame, and the transmitting power of all subcarriers that intermediate pilot takies is identical.Use intermediate pilot can estimate the channel of all sub-carrier positions on whole symbol, so that transmitting terminal is according to current channel conditions, reasonably can adopt efficient transmission policy like this.

In the present embodiment, after FFR is enable, base station is every the transmission cycle of N (N >=1) individual intermediate pilot, the OFDM symbol sending intermediate pilot is utilized to send the channel quality information of reference signal (namely this symbol does not send intermediate pilot and sends reference signal) for terminal measurement FP, terminal will measure the channel quality information feedback of FP that obtains to base station, and base station is terminal distribution resource according to the feedback information received and the terminal related information that stored.

In the present embodiment, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, utilize the 1st OFDM symbol of subframe SF3 (Subframe3) to send reference signal, the sub-carrier positions that reference signal specifically takies is as shown in black bars subcarrier SC1 to SC8 in Figure 12.The transmitting power that BS1, BS2, BS3 transmission reference signal takies subcarrier needs to be configured according to the average subcarrier power of corresponding base station on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 and SC2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1orSC2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1orSC2, BS1}represent the transmitting power of SC1 and SC2, Δ _{1, BS1}represent P _{sC1orSC2, BS1}float factor, namely reflection allow P _{sC1orSC2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS 1 sub-carriers SC3 and SC4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC3orSC4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC5 and SC6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC5orSC6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC7 and SC8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC7orSC8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1orSC2, BS1}=P ₀, P _{sC3orSC4, BS1}=P ₀, P _{sC5orSC6, BS1}=P ₀/ 2, P _{sC7orSC8, BS1}=P ₀/ 2.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 1st OFDM symbol of subframe SF3 (Subframe2) sends reference signal, terminal MS 1 measures the channel quality information on subcarrier SC1 to SC8, feeds back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

While base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC8 of the 1st OFDM symbol of subframe SF3 to send reference signal, also can send data message with other available subcarriers on this symbol; Or while base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC8 of the 1st OFDM symbol of subframe SF3 to send reference signal, on this symbol, other subcarriers do not send content;

Base station BS 1, BS2, BS3 can utilize whole available subcarriers of the 1st of subframe SF3 the OFDM symbol to send reference signal;

Embodiment six

The present embodiment is described for single antenna.

In an embodiment, after FFR is enable, base station is every the transmission cycle of N (N >=1) individual intermediate pilot, the OFDM symbol sending intermediate pilot is utilized to send the channel quality information of reference signal (namely this symbol does not send intermediate pilot and sends reference signal) for terminal measurement FP, terminal will measure the channel quality information feedback of FP that obtains to base station, and base station is terminal distribution resource according to the feedback information received and the terminal related information that stored.

The reference signal that BS1, BS2, BS3 send is the known signal of terminal.In the present embodiment, suppose that the 1st OFDM symbol utilizing subframe SF3 (Subframe3) sends reference signal, the sub-carrier positions that reference signal specifically takies as shown in Figure 10, comprises pilot reference signal and data reference signal.P1 is the pilot reference signal of BS1, and P2 is the pilot reference signal of BS2, and P3 is the pilot reference signal of BS3, and the transmitting power of P1, P2, P3 subcarrier is identical, and data reference signal is as shown in black bars subcarrier SC1 to SC8 in Figure 13.The transmitting power that BS1, BS2, BS3 transmission data reference signal takies subcarrier needs to be configured according to the average subcarrier power of corresponding base station on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 and SC2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1orSC2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1orSC2, BS1}represent the transmitting power of SC1 and SC2, Δ _{1, BS1}represent P _{sC1orSC2, BS1}float factor, namely reflection allow P _{sC1orSC2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC3 and SC4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC3orSC4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC5 and SC6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC5orSC6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC7 and SC8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC7orSC8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1orSC2, BS1}=P ₀, P _{sC3orSC4, BS1}=P ₀, P _{sC5orSC6, BS1}=P ₀/ 2, P _{sC7orSC8, BS1}=P ₀/ 2.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 1st OFDM symbol of subframe SF3 (Subframe3) sends reference signal, terminal MS 1 measurement pilot frequency reference signal P1 obtains the channel matrix of FP, and by the channel quality information that measurement data reference signal SC1 to SC8 obtains FP, feed back the channel quality information of specific FP to BS1.Wherein, this specific FP can select also reporting base station BS1, specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Base station BS 1 sends on the subcarrier of pilot reference signal P2 at BS2 and does not send data, and base station BS 1 sends on the subcarrier of pilot reference signal P3 at BS3 and do not send data.Base station BS 1 can utilize other available subcarriers on the symbol of transmission reference signal send data message or do not send data message.In like manner, base station BS 2 and BS3 is applicable to.

Embodiment seven

Be described for multiple antennas in the present embodiment, and in the present embodiment, system adopts structure as shown in Figure 9 and flow chart of data processing to process.

Wherein, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, and utilizes the 1st OFDM symbol of subframe SF3 (Subframe3) to send.

As shown in figure 14, reference signal is at N _tindividually (in the present embodiment, suppose N _t=2) sub-carrier positions that on antenna (Antenna), transmission specifically takies is as the subcarrier SC1 to SC16 of black bars in Figure 14.The transmitting power that BS1 transmission reference signal takies subcarrier needs to be configured according to the average subcarrier power of BS1 on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 to SC4 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1-SC4, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1-SC4, BS1}represent the transmitting power of SC1, SC2, SC3, SC4, Δ _{1, BS1}represent P _{sC1-SC4, BS1}float factor, namely reflection allow P _{sC1-SC4, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC5 to SC8 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC5-SC8, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC9 and SC12 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC9-SC12, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC13 and SC16 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC13-SC16, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1-SC4, BS1}=P ₀, P _{sC5-SC8, BS1}=P ₀, P _{sC9-SC12, BS1}=P ₀/ 2, P _{sC13-SC16, BS1}=P ₀/ 2.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 4th OFDM symbol of subframe SF3 (Subframe3) sends reference signal, terminal MS 1 measures the channel quality information on subcarrier SC1 to SC16, feeds back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

While base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC16 of the 1st OFDM symbol of subframe SF3 to send reference signal, also can send data message with other available subcarriers on this symbol; Or while base station BS 1, BS2, BS3 utilize the subcarrier SC1-SC16 of the 1st OFDM symbol of subframe SF3 to send reference signal, on this symbol, other subcarriers do not send content;

Base station BS 1, BS2, BS3 can utilize whole available subcarriers of the 1st of subframe SF3 the OFDM symbol to send reference signal.

Embodiment eight

In the present embodiment for multiple antennas and adopt intermediate pilot send reference signal be described.Further, system adopts structure as shown in Figure 9 and flow chart of data processing figure in the present embodiment.

The reference signal that wherein BS1, BS2, BS3 send is the known signal of terminal, and utilizes the 1st OFDM symbol of subframe SF3 (Subframe3) to send.

Reference signal is at N _tindividually (in the present embodiment, suppose N _t=2) as shown in figure 15, wherein, reference signal comprises pilot reference signal and data reference signal to the sub-carrier positions that on antenna (Antenna), transmission specifically takies.Wherein P1-1 is the pilot reference signal of the antenna 1 of BS1, and P1-2 is the pilot reference signal of the antenna 2 of BS1, and the pilot reference signal of BS1, BS2 and BS3 adopts the mode of frequency division multiplexing.Wherein, the subcarrier SC1 to SC16 of black bars is data reference signal.The transmitting power that BS1 transmission data reference signal takies subcarrier needs to be configured according to the average subcarrier power of BS1 on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 to SC4 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1-SC4, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1-SC4, BS1}represent the transmitting power of SC1, SC2, SC3, SC4, Δ _{1, BS1}represent P _{sC1-SC4, BS1}float factor, namely reflection allow P _{sC1-SC4, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC5 to SC8 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC5-SC8, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC9 and SC12 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC9-SC12, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC13 and SC16 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC13-SC16, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1-SC4, BS1}=P ₀, P _{sC5-SC8, BS1}=P ₀, P _{sC9-SC12, BS1}=P ₀/ 2, P _{sC13-SC16, BS1}=P ₀/ 2.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 1st OFDM symbol of subframe SF3 (Subframe3) sends reference signal, terminal MS 1 measurement pilot frequency reference signal P1-1, P1-2 obtain the channel matrix of FP, and by the channel quality information that measurement data reference signal SC1 to SC16 obtains FP, feed back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Base station BS 1 sends on the subcarrier of pilot reference signal P2 at BS2 and does not send data, and base station BS 1 sends on the subcarrier of pilot reference signal P3 at BS3 and do not send data.Base station BS 1 can utilize other available subcarriers on the symbol of transmission reference signal send data message or do not send data message.In like manner, identical process can be adopted for base station BS 2 and BS3.

Embodiment nine

In the present embodiment for single antenna and take part intermediate pilot send reference signal be described.

In 802.16m system, intermediate pilot (Midamble) refers to and special symbol in a frame sends specific pilot frequency sequence, be used for carrying out channel measurement at receiving terminal, such as in the penultimate subframe of descending sub frame (in the present embodiment for subframe SF3) first OFDM symbol on send intermediate pilot, and the transmission cycle of intermediate pilot is 1 frame, and the transmitting power of all subcarriers that intermediate pilot takies is identical.Use intermediate pilot can estimate the channel of all sub-carrier positions on whole symbol, so that transmitting terminal is according to current channel conditions, reasonably can adopt efficient transmission policy like this.

In the present embodiment, after FFR is enable, base station is every the transmission cycle of N (N >=1) individual intermediate pilot, some frequency resources (i.e. subcarrier) in the OFDM symbol sending intermediate pilot are utilized to send the channel quality information of reference signal for terminal measurement FP, terminal will measure the channel quality information feedback of FP that obtains to base station, and base station is terminal distribution resource according to the feedback information received and the terminal related information that stored.

In the present embodiment, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, utilize portion subcarriers in the 1st of subframe SF3 (Subframe3) the OFDM symbol (this symbol sends intermediate pilot) to send reference signal, the sub-carrier positions that reference signal specifically takies is as shown in black bars subcarrier SC1 to SC8 in Figure 16.The transmitting power that BS1, BS2, BS3 transmission reference signal takies subcarrier needs to be configured according to the average subcarrier power of corresponding base station on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 and SC2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1orSC2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1orSC2, BS1}represent the transmitting power of SC1 and SC2, Δ _{1, BS1}represent P _{sC1orSC2, BS1}float factor, namely reflection allow P _{sC1orSC2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC3 and SC4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC3orSC4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC5 and SC6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC5orSC6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC7 and SC8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC7orSC8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1orSC2, BS1}=P ₀, P _{sC3orSC4, BS11}=P ₀, P _{sC5orSC6, BS1}=P ₀/ 2, P _{sC7orSC8, BS1}=P ₀/ 2.

Therefore, after base station BS 1, BS2, BS3 use subcarrier SC1-SC8 to send reference signal, terminal measures the channel quality information on SC1 to SC8, feeds back the channel quality information of specific FP to base station.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 1st OFDM symbol of subframe SF3 (Subframe3) sends intermediate pilot and reference signal, terminal MS 1 measures the channel matrix that intermediate pilot M1 obtains FP, and by the channel quality information that measuring reference signals SC1 to SC8 obtains FP, feed back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Embodiment ten

The present embodiment is for multiple antennas and take part intermediate pilot and be described.

In 802.16m system, intermediate pilot (Midamble) refers to and special symbol in a frame sends specific pilot frequency sequence, be used for carrying out channel measurement at receiving terminal, such as in the penultimate subframe of descending sub frame (in the present embodiment for subframe SF3) first OFDM symbol on send intermediate pilot, and the transmission cycle of intermediate pilot is 1 frame, and the transmitting power of all subcarriers that intermediate pilot takies is identical.

In an embodiment, after FFR is enable, base station is every the transmission cycle of N (N >=1) individual intermediate pilot, some frequency resources (i.e. subcarrier) in the OFDM symbol sending intermediate pilot are utilized to send the channel quality information of reference signal for terminal measurement FP, terminal will measure the channel quality information feedback of FP that obtains to base station, and base station is terminal distribution resource according to the feedback information received and the terminal related information that stored.

In the present embodiment, system employs employing structure as shown in Figure 9 and flow chart of data processing.

Wherein, the reference signal that BS1, BS2, BS3 send is the known signal of terminal, and utilizes the portion subcarriers in the 1st of subframe SF3 (Subframe3) the OFDM symbol (this symbol is used for sending intermediate pilot) to send.

First reference signal after modulating-coding is divided into L layer by BS 1, generates M after then the data of this L layer being sent into MIMOencoder _tindividual Stream, then by this M _tindividual Stream sends into Precoder, and final Reference Signal is mapped to N _tindividual antenna (Antenna) is upper to be sent.Wherein, the processing procedure of Precoder works as M _tafter individual Stream sends into Precoder, pre-coding matrix index (Precode MatrixIndication, referred to as PMI) is passed through from known pre-coding matrix Resource selection pre-coding matrix PM-a in base station, and PM-a is multiplied by M _tindividual Stream, is mapped to N by result _tindividual antenna (Antenna) is upper to be sent.Wherein, base station can be configured by standard default when selecting pre-coding matrix PM-a, or base station Stochastic choice and the PMI sequence number notification terminal of PM-a that will select.

Reference signal is at N _tindividually (in the present embodiment, suppose N _t=2) sub-carrier positions that on antenna (Antenna), transmission specifically takies as shown in figure 17, wherein, M1-1 is the intermediate pilot of the antenna 1 of BS1, and M1-2 is the intermediate pilot of the antenna 2 of BS1, and the intermediate pilot of BS1, BS2 and BS3 adopts the mode of frequency division multiplexing.The subcarrier SC1 to SC16 of black bars is reference signal.The transmitting power that BS1 transmission reference signal takies subcarrier needs to be configured according to the average subcarrier power of BS1 on FP1, FP2, FP3 and FP4.The transmitting power of BS1 sub-carriers SC1 to SC4 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{sC1-SC4, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{sC1-SC4, BS1}represent the transmitting power of SC1, SC2, SC3, SC4, Δ _{1, BS1}represent P _{sC1-SC4, BS1}float factor, namely reflection allow P _{sC1-SC4, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers SC5 to SC8 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{sC5-SC8, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers SC9 and SC12 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{sC9-SC12, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers SC13 and SC16 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{sC13-SC16, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{sC1-SC4, BS1}=P ₀, P _{sC5-SC8, BS1}=P ₀, P _{sC9-SC12, BS1}=P ₀/ 2, P _{sC13-SC16, BS1}=P ₀/ 2.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 1st OFDM symbol of subframe SF3 (Subframe3) sends intermediate pilot and reference signal, terminal MS 1 measures the channel matrix that intermediate pilot M1-1, M1-2 obtain FP, and by the channel quality information that measuring reference signals SC1 to SC16 obtains FP, feed back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Embodiment 11

The present embodiment for single antenna, by intermediate pilot embody difference power be described.

In 802.16m system, intermediate pilot (Midamble) refers to and special symbol in a frame sends specific pilot frequency sequence, is used for carrying out channel measurement at receiving terminal.Such as, in the present embodiment, first OFDM symbol that intermediate pilot is arranged in the penultimate subframe (subframe SF3) of descending sub frame sends intermediate pilot.Suppose in the present embodiment that the transmission cycle of intermediate pilot is 1 frame.

After FFR is enable, base station needs to be configured according to the average subcarrier power of base station on FP1, FP2, FP3 and FP4 in the transmitting power of the subcarrier that intermediate pilot takies.

In the present embodiment, BS1, BS2, BS3 utilize the 1st of subframe SF3 (Subframe3) the OFDM symbol to adopt the mode of Reuse3 to send intermediate pilot, and the sub-carrier positions that intermediate pilot specifically takies is as shown in black bars subcarrier in Figure 18.The transmitting power of BS1 sub-carriers M1-1 and M1-2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{m1-1orM1-2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{m1-1orM1-2, BS1}represent the transmitting power of M1-1 and M1-2, Δ _{1, BS1}represent P _{m1-1orM1-2, BS1}float factor, namely reflection allow P _{m1-1orM1-2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers M1-3 and M1-4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{m1-3orM1-4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers M1-5 and M1-6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{m1-5orM1-6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers M1-7 and M1-8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{m1-7orM1-8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{m1-1orM1-2, BS1}=P ₀, P _{m1-3orM1-4, BS1}=P ₀, P _{m1-5orM1-6, BS1}=P ₀/ 2, P _{m1-7orM1-8, BS1}=P ₀/ 2.

Equally, suppose that the transmitting power of BS2 sub-carriers M2-1 to M2-8 is P _{m2-1orM2-2, BS2}=P ₀, P _{m2-3orM2-4, BS2}=P ₀/ 2, P _{m2-5orM2-6, BS2}=P ₀, P _{m2-7orM2-8, BS2}=P ₀/ 2

Equally, suppose that the transmitting power of BS3 sub-carriers M3-1 to M3-8 is P _{m3-1orM3-2, BS3}=P ₀, P _{m3-3orM3-4, BS3}=P ₀/ 2, P _{m3-5orM3-6, BS3}=P ₀/ 2, P _{m3-7orM3-8, BS3}=P ₀

Therefore, terminal measures the channel quality information on FP by intermediate pilot, and the channel quality information feeding back specific FP is to base station.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 1st OFDM symbol of subframe SF3 (Subframe3) sends intermediate pilot, terminal MS 1 measures the channel quality information that intermediate pilot M1-1 to M1-8 obtains FP1, FP2, FP3, FP4, feeds back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

It should be noted that, the transmission position of intermediate pilot is not limited in the 1st OFDM symbol of the subframe SF3 chosen in the present embodiment, also can be positioned at other symbols, also can be positioned at other descending sub frames, also can be positioned at multiple OFDM symbol.The transmission cycle of intermediate pilot is not limited only to 1 frame in the present embodiment, also can be multiple frame or multiple subframe or multiple superframe.

Embodiment 12

In the present embodiment, after FFR is enable, base station needs to be configured according to the average subcarrier power of base station on FP1, FP2, FP3 and FP4 in the transmitting power of the subcarrier that intermediate pilot takies.

In the present embodiment, BS1, BS2, BS3 utilize the 1st of subframe SF3 (Subframe3) the OFDM symbol to adopt the mode of Reuse1 to send intermediate pilot, and the sub-carrier positions that intermediate pilot specifically takies is as shown in black bars subcarrier in Figure 19.The transmitting power of BS1 sub-carriers M1-1 and M1-2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{m1-1orM1-2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{m1-1orM1-2, BS1}represent the transmitting power of M1-1 and M1-2, Δ _{1, BS1}represent P _{m1-1orM1-2, BS1}float factor, namely reflection allow P _{m1-1orM1-2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers M1-3 and M1-4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{m1-3orM1-4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers M1-5 and M1-6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{m1-5orM1-6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers M1-7 and M1-8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{m1-7orM1-8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{m1-1orM1-2, BS1}=P ₀, P _{m1-3orM1-4, BS1}=P ₀, P _{m1-5orM1-6, BS1}=P ₀/ 2, P _{m1-7orM1-8, BS1}=P ₀/ 2.

The transmission position of intermediate pilot is not limited in the 1st OFDM symbol of the subframe SF3 chosen in the present embodiment, also can be positioned at other symbols, also can be positioned at other descending sub frames, also can be positioned at multiple OFDM symbol.The transmission cycle of intermediate pilot is not limited only to 1 frame in the present embodiment, also can be multiple frame or multiple subframe or multiple superframe.

Embodiment 13

The present embodiment for multiple antennas, by intermediate pilot embody difference power be described.

In the present embodiment, system adopts structure as shown in Figure 9 and flow chart of data processing.

In the present embodiment, BS1, BS2, BS3 utilize the 1st of subframe SF3 (Subframe3) the OFDM symbol to adopt the mode of Reuse3 to send intermediate pilot.Wherein, the mode of described Reuse3 refers to that the subcarrier that BS1, BS2, BS3 transmission intermediate pilot takies is orthogonal in frequency.Wherein, the subcarrier that sends on multiple transmitting antenna shared by intermediate pilot of each base station is orthogonal in frequency.Below for BS1, describe sending method and the method for reseptance of intermediate pilot in detail.

In the present embodiment, suppose that BS1 is at N _tindividual (N _t=2) antenna (Antenna) sends intermediate pilot, the sub-carrier positions that pilot tone specifically takies is as shown in black bars subcarrier in Figure 20.The transmitting power of BS1 sub-carriers M1-1, M1-2, M2-1, M2-2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{m1-1, M1-2, M2-1, M2-2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{m1-1, M1-2, M2-1, M2-2, BS1}represent the transmitting power of M1-1, M1-2, M2-1, M2-2, Δ _{1, BS1}represent P _{m1-1, M1-2, M2-1, M2-2, BS1}float factor, namely reflection allow P _{m1-1, M1-2, M2-1, M2-2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers M1-3, M1-4, M2-3, M2-4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{m1-3, M1-4, M2-3, M2-4, BS1}=(1 ± Δ _{2, BS1}) P ₀; The transmitting power of BS1 sub-carriers M1-5, M1-6, M2-5, M2-6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{m1-5, M1-6, M2-5, M2-6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers M1-7, M1-8, M2-7, M2-8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{m1-7, M1-8, M2-7, M2-8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{m1-1, M1-2, M2-1, M2-2, BS1}=P ₀, P _{m1-3, M1-4, M2-3, M2-4, BS1}=P ₀, P _{m1-5, M1-6, M2-5, M2-6, BS1}=P ₀/ 2, P _{m1-7, M1-8, M2-7, M2-8, BS1}=P ₀/ 2.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, when BS1 is after the 1st OFDM symbol of subframe SF3 (Subframe3) sends intermediate pilot, terminal MS 1 measures the channel quality information that intermediate pilot obtains FP1, FP2, FP3, FP4, feeds back the channel quality information of specific FP to BS1.Wherein, described specific FP can select also reporting base station BS1, described specific FP can comprise one or more FP or whole FP by signaling terminal MS 1 or by terminal MS 1 by base station.

Embodiment 14

In the present embodiment after FFR is enable, base station needs to be configured according to the average subcarrier power of base station on FP1, FP2, FP3 and FP4 in the transmitting power of the subcarrier that intermediate pilot takies.

In the present embodiment, BS1, BS2, BS3 utilize the 1st of subframe SF3 (Subframe3) the OFDM symbol to adopt the mode of Reuse1 to send intermediate pilot.Wherein, the mode of described Reuse1 refers to that the subcarrier that BS1, BS2, BS3 transmission intermediate pilot takies is identical.Below for BS1, describe sending method and the method for reseptance of intermediate pilot in detail.

In the present embodiment, suppose that BS 1 is at N _tindividual (N _t=2) antenna (Antenna) sends intermediate pilot, the sub-carrier positions that pilot tone specifically takies is as shown in black bars subcarrier in Figure 21.The transmitting power of BS1 sub-carriers M1-1, M1-2, M2-1, M2-2 will with reference to the average subcarrier transmitting power P of FP1 ₀, i.e. P _{m1-1, M1-2, M2-1, M2-2, BS1}=(1 ± Δ _{1, BS1}) P ₀, wherein, P _{m1-1, M1-2, M2-1, M2-2, BS1}represent the transmitting power of M1-1, M1-2, M2-1, M2-2, Δ _{1, BS1}represent P _{m1-1, M1-2, M2-1, M2-2, BS1}float factor, namely reflection allow P _{m1-1, M1-2, M2-1, M2-2, BS1}relative to P ₀floating size.In like manner, the transmitting power of BS1 sub-carriers M1-3, M1-4, M2-3, M2-4 will with reference to the average subcarrier transmitting power P of FP2 ₀, i.e. P _{m1-3, M1-4, M2-3, M2-4, BS1}=(1 ± Δ _{2, BS1}) P ₀; BS1; The transmitting power of BS1 sub-carriers M1-5, M1-6, M2-5, M2-6 will with reference to the average subcarrier transmitting power P of FP3 ₀/ 2, i.e. P _{m1-5, M1-6, M2-5, M2-6, BS1}=(1 ± Δ _{3, BS1}) P ₀/ 2; The transmitting power of BS1 sub-carriers M1-7, M1-8, M2-7, M2-8 will with reference to the average subcarrier transmitting power P of FP4 ₀/ 2, i.e. P _{m1-7, M1-8, M2-7, M2-8, BS1}=(1 ± Δ _{4, BS1}) P ₀/ 2.In the present embodiment, Δ _{1, BS1}, Δ _{2, BS1}, Δ _{3, BS1}, Δ _{4, BS1}suppose all to equal 0, then P _{m1-1, M1-2, M2-1, M2-2, BS1}=P ₀, P _{m1-3, M1-4, M2-3, M2-4, BS1}=P ₀, P _{m1-5, M1-6, M2-5, M2-6, BS1}=P ₀/ 2, P _{m1-7, M1-8, M2-7, M2-8, BS1}=P ₀/ 2.

In embodiment, said method two is described below.Below in an example, there are three base stations in supposing the system and be respectively BS1, BS2 and BS3.After FFR is enable, base station BS 1, BS2 and the BS3 all or part of FP respectively in specific OFDM symbol does not send any information, measures the channel quality information of all or part of FP for terminal.Wherein, the OFDM symbol that do not send on identical FP shared by information of BS1, BS2 and BS3 is not identical.Wherein, specific OFDM symbol can be that standard default configuration or base station are determined through consultation.

Embodiment 15

Be described said method two in the present embodiment, in the present embodiment, each base station OFDM do not sent shared by information on identical frequency partition meets not identical, and all measures for all frequency partition in the set of frequency partition.

The method that terminal measures the channel quality information of FP is described in detail below for BS1.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, after FFR is enable, base station BS 1 needs the channel quality information of terminal to report FP1, FP2, FP3 and FP4.The BS1 subcarrier that FP1 is corresponding in the 3rd OFDM symbol of the 2nd descending sub frame of the 1st frame of L superframe does not send any information, the BS1 subcarrier that FP2 is corresponding in the 3rd OFDM symbol of the 2nd descending sub frame of the 2nd frame of L superframe does not send any information, the BS1 subcarrier that FP3 is corresponding in the 3rd OFDM symbol of the 2nd descending sub frame of the 3rd frame of L superframe does not send any information, the BS1 subcarrier that FP4 is corresponding in the 3rd OFDM symbol of the 2nd descending sub frame of the 4th frame of L superframe does not send any information.

Terminal MS 1 measures the interference strength value from other base stations (BS2 and BS3) respectively in the described OFDM symbol moment on FP1, FP2, FP3 and FP4, and the interference strength value of acquisition is reported serving BS BS1.

Above-mentioned similar process can be adopted for BS2 with BS3.

Embodiment 16

Be described said method two in the present embodiment, in the present embodiment, each base station OFDM do not sent shared by information on identical frequency partition meets not identical, and measures for the component frequency subregion in the set of frequency partition.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, after FFR is enable, base station BS 1 needs the channel quality information of terminal to report FP1 and FP2.Then the BS1 subcarrier that FP1 is corresponding in the 3rd OFDM symbol of the 2nd descending sub frame of the 1st frame of L superframe does not send any information, the BS1 subcarrier that FP2 is corresponding in the 3rd OFDM symbol of the 2nd descending sub frame of the 2nd frame of L superframe does not send any information.

Terminal MS 1 measures the interference strength value from other base stations (BS2 and BS3) respectively in the above-mentioned OFDM symbol moment on FP1, FP2, and the interference strength value of acquisition is reported serving BS BS1.

Embodiment 17

Be described said method two in the present embodiment, in the present embodiment, each base station OFDM do not sent shared by information on identical frequency partition meets identical, and all measures for all frequency partition in the set of frequency partition.

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, after FFR is enable, base station BS 1 needs the channel quality information of terminal to report FP1, FP2, FP3 and FP4.BS1 does not send any information in the 3rd OFDM symbol of the 2nd descending sub frame of the 1st frame of L superframe.

Terminal MS 1 measures the interference strength value from other base stations (BS2 and BS3) respectively in the above-mentioned OFDM symbol moment on FP1, FP2, FP3 and FP4, and the interference strength value of acquisition is reported serving BS BS1.

Embodiment 18

In the present embodiment, suppose that the serving BS of terminal MS 1 is BS1, after FFR is enable, base station BS 1 needs the channel quality information of terminal to report FP1 and FP2.Then the BS1 subcarrier that FP1, FP2 are corresponding in the 3rd OFDM symbol of the 2nd descending sub frame of the 1st frame of L superframe does not send any information.

Terminal MS 1 measures the interference strength value from other base stations (BS2 and BS3) respectively in the described OFDM symbol moment on FP1, FP2, and the interference strength value of acquisition is reported serving BS BS1.

Embodiment is described said method three below.

Embodiment 19

In the present embodiment, the transmitting power configuration information of all FP in signaling transmission frequency partitioned set is adopted.

Transmission and the method for reseptance of this signaling is described below in detail for BS1.

In the present embodiment, suppose the transmitting power of the subcarrier of BS1 on FP1 to be the transmitting power of P1, the BS1 subcarrier on FP2 be that the transmitting power of P2, the BS1 subcarrier on FP3 be the transmitting power of P3, the BS1 subcarrier on FP4 is P4.Then the absolute value information of P1, P2, P3, P4 is sent to terminal MS 1 by signaling S1 by BS1.

MS1 receives the signaling S1 that base station BS 1 sends, and is obtained subcarrier transmitting power P1, P2, P3 and P4 of FP1, FP2, FP3 and FP4 by decoding S1.

Wherein, it should be noted that, the mode that BS1 sends P1, P2, P3, P4 is not limited in the absolute-value sense described in the present embodiment, also the mode of difference can be adopted to send, namely from subcarrier transmitting power P1, P2, P3 and P4 of FP1, FP2, FP3 and FP4, select the subcarrier transmitting power Px of a FP, adopt absolute-value sense to send Px, the subcarrier transmitting power of other FP adopts and sends with the difference mode of Px.Such as, BS1 selection frequency re-use factor is the subcarrier transmitting power P2 of FP2 in the FP set of Reuse1/3, adopts absolute-value sense to send, and P1, P3 and P4 adopt difference mode to send.Receiving terminal, first MS1 recovers P2 by decoding, and then recovers P1, P3 and P4.

Embodiment 20

In the present embodiment, the transmitting power configuration information of part FP in signaling transmission frequency partitioned set is adopted.

In the present embodiment, suppose the transmitting power of the subcarrier of BS1 on FP1 to be the transmitting power of P1, the BS1 subcarrier on FP2 be that the transmitting power of P2, the BS1 subcarrier on FP3 be the transmitting power of P3, the BS1 subcarrier on FP4 is P4.The transmitting power P1 of the subcarrier on FP1 (is not limited in the transmitting power P1 of the subcarrier of FP1 here as standard default configuration store in base station and terminal, also can be the transmitting power of the subcarrier of other one or more FP), then the absolute value information of P2, P3, P4 is sent to terminal MS 1 by signaling S1 by BS 1.

MS1 receives the signaling S1 that base station BS 1 sends, and is obtained subcarrier transmitting power P2, P3 and P4 of FP2, FP3 and FP4 by decoding S1.

Wherein, it should be noted that, the mode that BS1 sends P2, P3, P4 is not limited in the absolute-value sense described in the present embodiment, also the mode of difference can be adopted to send, namely from subcarrier transmitting power P2, P3 and P4 of FP2, FP3 and FP4, select the subcarrier transmitting power Px of a FP, adopt absolute-value sense to send Px, the subcarrier transmitting power of other FP adopts and sends with the difference mode of Px.Such as, BS1 selection frequency re-use factor is the subcarrier transmitting power P2 of FP2 in the FP set of Reuse1/3, adopts absolute-value sense to send, P3 and P4 adopts difference mode to send.Receiving terminal, first MS1 recovers P2 by decoding, and then recovers P3 and P4.

Wherein, it should be noted that, the mode that BS1 sends P2, P3, P4 is not limited in the absolute-value sense described in the present embodiment, and the mode of another kind of difference can also be adopted to send, and namely subcarrier transmitting power P2, P3, P4 of FP2, FP3, FP4 adopt and send with the difference mode of P1.Receiving terminal, MS1 knows the subcarrier transmitting power P1 of FP1 according to standard default configuration, and then recovers P2, P3 and P4 by decoding.

Embodiment 21

In the present embodiment, utilize the identifying information (SegmentID) of sector and the corresponding relation of transmitting power configuration information, the transmitting power configuration information of whole FP in the set of terminal notification frequency partition.

The preparation method of the subcarrier transmitting power of each FP is described below in detail for BS1.

In the present embodiment, supposing that MS1 is take BS1 as the terminal of serving BS, main lead code (the Primary Advanced Preamble of the evolution that MS1 is sent by decoding BS1, referred to as PA-Preamble), know the band width configuration information of BS1, in the present embodiment, suppose that the bandwidth that BS1 uses is 10MHz.The SA-Preamble (SecondAdvanced Preamble) that MS1 decoding BS1 sends), know that the SA-Preamble sequence that BS1 sends is SAP-1.In the corresponding relation of the operable SA-Preamble arrangement set of 10MHz bandwidth that MS1 configures at standard default and SegmentID, find the SegmentID that sequence SAP-1 is corresponding, be assumed to be Segment 1, namely the SegmentID of BS 1 is Segment 1.Last terminal MS 1, according to the corresponding relation of the transmitting power of SegmentID and FP, finds the transmitting power of the FP of BS1 to configure by Segment 1.

Embodiment 22

In the present embodiment, utilize the corresponding relation of SA-Pr call number and transmitting power configuration information, the transmitting power configuration information of whole FP in the set of terminal notification frequency partition.

The preparation method of the subcarrier transmitting power of each FP is described below in detail for BS 1.

In the present embodiment, supposing that MS1 is take BS1 as the terminal of serving BS, the PA-Preamble (Primary Advanced Preamble) that MS1 is sent by decoding BS1, knows the band width configuration information of BS1, supposes that the bandwidth that BS1 uses is 10MHz in the present embodiment.The SA-Preamble (Second Advanced Preamble) that MS1 decoding BS1 sends, knows that the SA-Preamble sequence that BS1 sends is SAP-1.Find the call number of sequence SAP-1 in the operable SA-Preamble arrangement set of 10MHz bandwidth that MS1 configures at standard default, be assumed to be Index-1.Last terminal MS 1, according to the corresponding relation of the transmitting power of the operable SA-Preamble arrangement set of 10MHz bandwidth and FP, finds the transmitting power of the FP of BS1 to configure by call number Index-1.

Embodiment 23

In the present embodiment, utilize the corresponding relation of IDCell sequence number and transmitting power configuration information, the transmitting power configuration information of whole FP in the set of terminal notification frequency partition.

In the present embodiment, supposing that MS1 is take BS1 as the terminal of serving BS, the PA-Preamble (Primary Advanced Preamble) that MS1 is sent by decoding BS1, knows the band width configuration information of BS1, supposes that the bandwidth that BS 1 uses is 10MHz in the present embodiment.The SA-Preamble (Second Advanced Preamble) that MS1 decoding BS1 sends, knows that the SA-Preamble sequence that BS1 sends is SAP-1.Find the call number of sequence SAP-1 in the operable SA-Preamble arrangement set of 10MHz bandwidth that MS1 configures at standard default, be assumed to be Index-1.In the corresponding relation of the operable SA-Preamble arrangement set of 10MHz bandwidth that MS1 configures at standard default and SegmentID, find the SegmentID that sequence SAP-1 is corresponding, be assumed to be Segment 1, namely the SegmentID of BS1 is Segment 1.MS1 according to Segment 1 and Index-1 by calculating the IDCell of BS1.MS1, according to the corresponding relation of IDCell and the FP power configuration of base station, finds the IDCell of BS1 to deserved FP power configuration information, and then obtains the power configuration information of FP of BS1.

Last terminal MS 1, according to the corresponding relation of the transmitting power of the operable SA-Preamble arrangement set of 10MHz bandwidth and FP, finds the transmitting power of the FP of BS1 to configure by call number Index-1.

Embodiment 24

In the present embodiment, adopt the index information of the transmitting power configuration of all FP in signaling transmission frequency partitioned set, and indicate the position of the transmitting power configuration information of one or more frequency partition in the transmitting power configuration index table of frequency partition by index information.Wherein, described concordance list is stored in described base station and described terminal as standard configuration.

In the present embodiment, suppose that the transmitting power of the subcarrier of BS1 on FP1, FP2, FP3 and FP4 is P1, P2, P3 and P4 respectively.BS1 by searching the transmitting power configuration index table of the frequency partition of standard configuration, index information corresponding when finding 4 FP transmitting powers under the prerequisite of 4 FP to be respectively P1, P2, P3 and P4.Then this index information is sent to terminal MS 1 by signaling S1 by BS1.

MS1 receives the signaling S1 that base station BS 1 sends, and obtains above-mentioned index information, and find transmitting power P1, P2, P3 and P4 of the frequency partition that above-mentioned index information is corresponding by the transmitting power configuration index table searching frequency partition by decoding S1.

As mentioned above, by the technical scheme that the embodiment of the present invention provides, base station sends reference signal by down channel according to the transmitting power of each FP on each FP, to make terminal by reference to the channel quality information of each frequency partition of signal measurement, thus the accuracy of the channel quality information that terminal is measured can be improved.And, in embodiments of the present invention, the serving BS of terminal can not send any information on predetermined running time-frequency resource, to make terminal receive only signal from other base stations except this serving BS on this running time-frequency resource, thus can measure the interference strength on this running time-frequency resource accurately.In addition, in embodiments of the present invention, by other indication information of transmit power levels of each frequency partition of notification terminal, base station, make terminal can know the transmitting power configuration of each frequency partition, thus the accuracy that terminal measures the channel quality of each frequency partition can be improved.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a signal channel quality measuring method, for measuring the channel quality information in wireless communication system, is characterized in that, described method comprises:

Base station sends reference signal by down channel on the pre-subcarrier of frequency partition, wherein, the transmitting power described frequency partition sending reference signal is corresponding with the transmitting power of described frequency partition, measures the channel quality information of described frequency partition to make terminal by described reference signal; Wherein, described base station sends reference signal by down channel and comprises on the pre-subcarrier of frequency partition: the transmitting power of described pre-subcarrier, according to the transmitting power of described frequency partition, is determined in described base station; Described base station adopts the described transmitting power determined to send described reference signal on described pre-subcarrier.

2. method according to claim 1, is characterized in that, described frequency partition comprises: the one or more frequency partition in the set of frequency partition.

3. method according to claim 2, is characterized in that, one of in such a way determines described frequency partition:

Determined by described base station;

Determined by upper layer network element and notify described base station;

Determine according to pre-configured.

4. method according to claim 2, is characterized in that, described pre-subcarrier is determined one of in the following manner:

Determined by described base station;

Determined by upper layer network element and notify described base station;

Determine according to pre-configured.

5. the method according to claim 3 or 4, is characterized in that, described upper layer network element comprises one of following: base station, trunking, base station controller, access service network, connection service network, core net, core network gateway.

6. method according to claim 1, is characterized in that, described base station, according to the transmitting power of described frequency partition, determines that the transmitting power of described pre-subcarrier comprises:

The transmitting power of described frequency partition is higher, and the transmitting power of the described pre-subcarrier determined is higher.

7. method according to claim 6, is characterized in that,

The transmitting power of described pre-subcarrier is identical with the average transmit power of the subcarrier of described frequency partition or differ predetermined value.

8. the method according to any one of Claims 1-4,6 and 7, it is characterized in that, the content and structure of the described reference signal that described base station is sent on frequency partition by down channel is pre-determined by described base station and described terminal or according to preset configuration.

9. method according to claim 8, is characterized in that, after described base station sends described reference signal, described method also comprises:

Described terminal obtains the channel quality information of described frequency partition by measuring described reference signal.

10. method according to claim 9, is characterized in that, described channel quality information comprise following one of at least:

Received signal strength indicator information;

Interference measure;

Signal and interference and noise ratio;

Signal to noise ratio;

Signal and noise ratio;

Spectrum efficiency;

The measured value relevant with channel quality.

11. 1 kinds of channel quality measurement systems, is characterized in that, comprising:

Base station, for sending reference signal by down channel on the pre-subcarrier of frequency partition; Wherein, on the pre-subcarrier of frequency partition, send reference signal by down channel and comprise: the transmitting power of described pre-subcarrier, according to the transmitting power of described frequency partition, is determined in described base station; Described base station adopts the described transmitting power determined to send described reference signal on described pre-subcarrier;

Terminal, for receiving described reference signal, and measures the channel quality information of described frequency partition according to described reference signal.