CN102449967B - Mobile communication system and data transmission method thereof - Google Patents

Mobile communication system and data transmission method thereof Download PDF

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CN102449967B
CN102449967B CN200980159604.8A CN200980159604A CN102449967B CN 102449967 B CN102449967 B CN 102449967B CN 200980159604 A CN200980159604 A CN 200980159604A CN 102449967 B CN102449967 B CN 102449967B
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equipment
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CN102449967A (en
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蒋琦
沈钢
郑武
张凯宾
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation

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Abstract

The invention provides a mobile communication system and data transmission method thereof. The mobile communication system includes a first device, a second device and user terminal. The downlink channels from the first device and the second device to the user terminal are the first channel and second channel respectively. The first device transmits reference signal for channel estimation through the first channel; the second device transmits data signal through the second channel. Before transmitting the data signal, the second device performs the processing of pseudo channel precoding and power adjustment to enable the user terminal to demodulate correctly the received data signal by using the channel estimation of the first channel. With the method, system and device provided by the present invention, the user terminal can demodulate correctly the data signal received through the second channel according to the channel estimation of the first channel without any modification to the user terminal.

Description

Mobile communication system and data transmission method wherein
Technical field
The present invention relates to mobile communication technology, relate in particular to mobile communication system and data transmission method wherein, more specifically, the present invention relates to relay system and be wherein used to terminal that the method for data-signal is provided.
Background technology
In the Long Term Evolution project (LTE) of 3GPP, relaying is a kind of very important technology.Relaying technique can improve signal cover, increases message capacity and config option is more flexibly provided.
In the working conference of 3GPP, Type II relaying has obtained to be agreed to and has been included into standard (R1-091632).Type II relaying framework is defined as follows:
1. Type II relaying should not have independent community ID, and does not therefore produce any new community;
2. Type II relaying can be to version 8 user terminals (UE) relay data, and can relaying from the data of version 8 user terminals;
3. at least version 8 user terminals should not recognized the existence of Type II relaying.
LTE cell specific reference signal (CRS) can be regarded as the designator of LTE physical-layer cell identity.Type II via node (RN) does not have its CRS, and in other words, Type II via node does not send CRS, or sends the identical CRS of CRS that evolution Node B associated with it (Evolved Node B, eNB) sends.
For version 8 user terminals, in order to implement descending demodulation, need to obtain down channel by CRS and estimate.But, because via node does not send its oneself CRS, obtain downlink data although be therefore from via node, but user terminal must be used from the CRS of corresponding evolution Node B and obtain the channel estimating of evolution Node B to this user terminal, and carry out the downlink data that demodulation obtains from via node by this channel estimating.Due to user terminal acquisition is the channel estimating of evolution Node B to user terminal, the down channel from via node to this user terminal and user terminal receives end data-signal experience, common two down channels are not identical, therefore, user terminal carries out demodulation meeting generation distortion by evolution Node B to the channel estimating of user terminal to the downlink data from via node.
Therefore, need a kind of scheme, do not need user terminal to do any change, just can make user terminal carry out the data-signal that correctly demodulation is received by different channels by the channel estimating of a certain channel that can obtain.
Summary of the invention
In order to address the above problem, the present invention proposes new technical scheme, comprise mobile communication system and data transmission method wherein.
According to a first aspect of the invention, proposed a kind of data transmission method in mobile communication system, described method comprises: send the reference signal for channel estimating by the first channel; Send data-signal by second channel; And before sending described data-signal, described data-signal is carried out to pseudo-channel precoding and power adjustment processing, with the data-signal that makes described user terminal can use the correctly demodulation of channel estimating of described the first channel of determining according to the reference signal receiving to receive.
According to a second aspect of the invention, a kind of mobile communication system has been proposed, comprise: the first equipment, the second equipment and user terminal, wherein said the first equipment is the first channel to the down channel of described user terminal, described the second equipment is second channel to the down channel of described user terminal; Described the first equipment sends the reference signal for channel estimating by the first channel; Described the second equipment sends data-signal by second channel; Described the second equipment is before sending described data-signal, described data-signal is carried out to pseudo-channel precoding and power adjustment processing, with the data-signal that makes described user terminal can use the correctly demodulation of channel estimating of described the first channel of determining according to the reference signal receiving to receive.
The method, system and the equipment that in the application of the invention, provide, can make user terminal to carry out the data-signal that correctly demodulation is received by second channel according to the channel estimating of the first channel without user terminal being done to any change.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done referring to accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.
Fig. 1 shows the composition schematic diagram according to the mobile communication system of a specific embodiment of the present invention;
Fig. 2 shows according to the flow chart of the data transmission method in mobile communication system of a specific embodiment of the present invention;
Fig. 3 shows according to the flow chart of the pseudo-channel precoding of a specific embodiment of the present invention and power adjustment processing;
Fig. 4 shows according to the flow chart of the pseudo-channel precoding of another specific embodiment of the present invention and power adjustment processing;
Wherein, same or analogous Reference numeral represents same or analogous steps characteristic or device (module).
Embodiment
Fig. 1 shows the composition schematic diagram according to the mobile communication system of a specific embodiment of the present invention.As shown in the figure, the mobile communication system of this embodiment comprises the first equipment 1, the second equipment 2 and user terminal 3.Wherein, the first equipment 1 is the first channel to the down channel of user terminal 3, and the second equipment 2 is second channel to the down channel of user terminal 3.
Fig. 2 shows according to the flow chart of the data transmission method in mobile communication system of a specific embodiment of the present invention.Below in conjunction with Fig. 1, the data transmission method in the mobile communication system of this embodiment is described.
In step S1, will send the reference signal for channel estimating by the first channel.That is the transmit leg of reference signal is the first equipment 1, recipient is user terminal 3.User terminal 3 can obtain according to the reference signal receiving the channel estimating of the first channel
Figure GPA0000133525550000051
.
In step S22, will send data-signal by second channel.That is the transmit leg of data-signal is the second equipment 2, recipient is user terminal 3.
Completed step S1, S22, data transmission method completes.In user terminal 3, will perform step S3, the channel estimating of doing according to the reference signal receiving is carried out the data-signal that demodulation receives.
The reference signal that the first equipment 1 is sent is expressed as P, and the data-signal that the second equipment is sent is expressed as S.The first equipment 1 to the normalization down channel of the first channel of user terminal 3 is expressed as H 1, the second equipment 2 to the normalization down channel of the second channel of user terminal 3 is expressed as H 2.ρ 1and ρ 2represent respectively the path loss factor of the first channel and second channel (that is from the first equipment 1 to user terminal 3 and from second equipment 2 to user terminal 3), wherein comprised respectively the transmitted power of reference signal of the first equipment 1 and the transmitted power of the data-signal of the second equipment.
Reference signal and data-signal that user terminal 3 receives are expressed as:
Y 1＝ρ 1·H 1·P+n＝H′ 1·P+n
(1)
Y 2＝ρ 2·H 2·S+n＝H′ 2·S+n
Wherein H ' 1and H ' 2represent respectively the equivalent channel of the first equipment 1 to the equivalent channel of user terminal 3 and the second equipment 2 to user terminal 3.According to formula (1), the channel estimating that user terminal 3 is made according to the reference signal receiving can be expressed as:
H ^ 1 = Y 1 / ( ρ 1 · P ) - - - ( 2 )
Because the channel response of the first channel and second channel is different, therefore, in order to make user terminal 3 to carry out the data-signal that correctly demodulation receives by the channel estimating of the first channel of determining according to the reference signal receiving, before step S22, also has a step S21.In step S21, will the data-signal that will send be carried out to pseudo-channel precoding and power adjustment processing, this step is carried out by the second equipment 2 that sends data-signal.
Pseudo-channel pre-coding matrix is set to
Figure GPA0000133525550000064
do not consider power adjustment, the data-signal that user terminal 3 is received is expressed as:
Y′ 2＝ρ 2·H 2·α·S+n＝H′ 1·S+n (3)
Thereby user terminal 3 can use the channel estimating of the first channel
Figure GPA0000133525550000062
carry out the data-signal Y ' that correctly demodulation receives 2to recover data-signal S.
H ' in the expression formula of pseudo-channel pre-coding matrix 1and H ' 2be respectively the equivalent channel of the first channel and second channel, this is the result of theory analysis, in practical operation, conventionally adopts respectively the channel estimating of the first channel and second channel
Figure GPA0000133525550000065
with
Figure GPA0000133525550000066
substitute, that is pseudo-channel pre-coding matrix is
Figure GPA0000133525550000063
according to a specific embodiment of the present invention, before step S21, also comprise a step.In this step, by the channel estimating of obtaining second channel for calculating pseudo-channel pre-coding matrix.Conventionally this step is carried out by the second equipment 2.
Particularly, for example, in time division duplex (TDD) system, can be sent and be visited messenger (sounding signal) by user terminal 3, the channel estimating that the second equipment 2 can be made according to the spy messenger receiving be used as the channel estimating of second channel.Similarly, in tdd systems, can also be notified to the second equipment 2 as the channel estimating of the first channel according to the channel estimating of making from the spy messenger of user terminal 3 by the first equipment 1.Or, can be also that user terminal 3 is according to making the channel estimating of the first channel and feed back to the first equipment 1 and/or the second equipment 2 from the reference signal of the first equipment 1.
Conventionally, the scheme that adopts above-mentioned control signal to separate with data-signal be the channel quality at the first channel poor, that is the amplitude of the equivalent channel of the first channel is less than the amplitude of the equivalent channel of second channel.Thereby the amplitude (mould value) of pseudo-channel pre-coding matrix α is less than 1 conventionally.Now, the actual transmission power of the second equipment 2 reduces, and the signal to noise ratio of the data-signal that user terminal 3 receives is increased, thereby reception is under some influence.Therefore,, in step S21, the pseudo-channel precoding that the second equipment 2 is performed and power adjustment are also used and are considered transmitted power in processing.
Fig. 3 shows according to the flow chart of the pseudo-channel precoding of a specific embodiment of the present invention and power adjustment processing.As shown in Figure 3, the step S21 that data-signal is carried out to pseudo-channel precoding and power adjustment processing further comprises step S211 and step S212.
In step S211, will determine that pseudo-channel pre-coding matrix is
Figure GPA0000133525550000071
and be applied to described data-signal, wherein
Figure GPA0000133525550000072
represent channel estimating contrary of described second channel,
Figure GPA0000133525550000073
represent the channel estimating of described the first channel.
In step S212, will described data-signal be applied to a power adjusting factor τ to adjust the transmitted power of described data-signal.
According to a specific embodiment of the present invention, power adjusting factor is set to τ=ρ 2/ ρ 1.The data-signal that user terminal 3 receives is expressed as:
Y ′ ′ 2 = ρ 2 · H 2 · ( H ^ 2 - 1 · H ^ 1 ) · τ · S + n ≈ ρ 2 · H 1 · S + n - - - ( 4 )
As can be seen from the above equation, although the normalization channel response of data-signal experience by the normalization channel H of second channel 2change the normalization channel H of the first channel into 1, but the path loss factor of its experience is still ρ 2.Namely the transmitted power of the second equipment 2 does not change, thereby can make full use of the link gain of second channel, and the receptivity of data-signal is improved.
Alternatively, the first equipment 1 is also notified power adjusting factor τ to user terminal 3.User terminal 3 is by thinking that the power ratio between reference signal and data-signal adjusts according to power adjusting factor τ, so user terminal 3 will be applied this power adjusting factor in the time of data demodulates.Particularly, user terminal 3 can count this power adjusting factor in the time that the first channel is carried out to channel estimating, and the channel estimating of determined the first channel of user terminal 3 becomes:
H ^ ′ 1 = Y 1 ρ 1 · P · 1 τ = Y 1 ρ 2 · P - - - ( 5 )
Power adjusting factor is not necessarily fixed as τ=ρ 2/ ρ 1, it can also be adjusted according to actual conditions.According to a specific embodiment of the present invention, power adjusting factor only need to be set to τ > 1.
Fig. 4 shows according to the flow chart of the pseudo-channel precoding of a specific embodiment of the present invention and power adjustment processing.As shown in Figure 4, the step S21 that data-signal is carried out to pseudo-channel precoding and power adjustment processing further comprises step S211 ' and step S212 '.
In step S211 ', will determine that pseudo-channel pre-coding matrix is
Figure GPA0000133525550000082
wherein
Figure GPA0000133525550000083
represent channel estimating contrary of described second channel, represent the channel estimating of described the first channel.
In step S212 ', pseudo-channel pre-coding matrix is normalized and applied data signal.
Because
Figure GPA0000133525550000085
with
Figure GPA0000133525550000086
be respectively the channel estimating of the first channel and second channel, so have:
H ^ 1 ≈ H ′ 1 And H ^ 2 ≈ H ′ 2 .
Therefore, normalized pseudo-channel pre-coding matrix approximates
Figure GPA0000133525550000089
wherein H 1represent the normalization down channel of the first channel, H 2represent the normalization down channel of second channel.
After normalized pseudo-channel pre-coding matrix applied data signal, the transmitted power of data-signal does not change, thereby can make full use of the link gain of second channel, and the receptivity of data-signal is improved.
Those skilled in the art will be understood that step S21 by sub-step S211 ' and S212 ' realize with by sub-step S211 and S212 and adopt power adjusting factor τ=ρ 2/ ρ 1it is equivalent realizing.
According to a specific embodiment of the present invention, mobile communication system is wherein to support the system of relaying, the first equipment 1 is a base station, the second equipment 2 is via nodes for its jurisdiction, user terminal 3 provides service by this base station and this via node, the first channel is the down channel of base station 1 to user terminal 3, and second channel is the down channel of via node 2 to user terminal 3.The concrete application scenarios of this embodiment is: the reference signal that base station 1 sends for channel estimating; Via node 2 sends data-signal, and before sending, data-signal is carried out to pseudo-channel precoding and power adjustment processing.Conventionally, such scene occurs in the quality second-rate and second channel of the first channel when better.User terminal 3, after receiving reference signal and data-signal, can correctly be used by the determined channel estimating of the reference signal receiving the data-signal receiving is carried out to demodulation, the data-signal being sent to recover.
More specifically, according to a specific embodiment of the present invention, mobile communication system is wherein the system of a 3GPP LTE-A, and supports Type II relaying; The first equipment 1 is the evolution Node B (eNB) in 3GPP LTE-A, and the second equipment 2 is Type II via nodes for its jurisdiction; The first channel is the down channel of this evolution Node B to user terminal 3, and second channel is the down channel of via node 2 to user terminal 3.The concrete application scenarios of this embodiment is: evolution Node B sends the cell specific reference signal (CRS) for channel estimating; Via node 2 sends data-signal, and before sending, data-signal is carried out to pseudo-channel precoding and power adjustment processing.Conventionally, such scene occurs in the quality second-rate and second channel of the first channel when better.User terminal 3, after receiving reference signal and data-signal, can correctly be used by the determined channel estimating of the reference signal receiving the data-signal receiving is carried out to demodulation, the data-signal being sent to recover.
Those skilled in the art will be understood that in above-described embodiment and are exemplary and nonrestrictive to the restriction of mobile communication system, the first equipment 1, the second equipment 2.According to other embodiment of the present invention, the first equipment 1 and the second equipment 2 can be base station or evolution Node B, and both work in coordination with provides service for user terminal 3.The first channel is the down channel of base station 1 to user terminal 3, and second channel is the down channel of base station 2 to user terminal 3.The concrete application scenarios of this embodiment is: the reference signal that base station 1 sends for channel estimating; Base station 2 sends data-signal, and before sending, data-signal is carried out to pseudo-channel precoding and power adjustment processing.Conventionally, such scene occurs in the quality second-rate and second channel of the first channel when better.User terminal 3, after receiving reference signal and data-signal, can correctly be used by the determined channel estimating of the reference signal receiving the data-signal receiving is carried out to demodulation, the data-signal being sent to recover.
Above indefiniteness embodiment of the present invention is described, but the present invention is not limited to specific system, equipment and concrete agreement, those skilled in that art can make various distortion or modification within the scope of the appended claims.

Claims (12)

1. the data transmission method in mobile communication system, described method comprises:
Send the reference signal for channel estimating by the first channel;
Send data-signal by second channel; And
Before sending described data-signal, described data-signal is carried out to pseudo-channel precoding and power adjustment processing, so that obtain the data-signal that user terminal can use the correctly demodulation of channel estimating of described the first channel of determining according to the reference signal receiving to receive;
Wherein, described pseudo-channel precoding and power adjustment processing comprise:
Determine pseudo-channel pre-coding matrix
Figure RE-FSB0000119636180000011
and be applied to described data-signal, wherein
Figure RE-FSB0000119636180000012
represent channel estimating contrary of described second channel,
Figure RE-FSB0000119636180000013
represent the channel estimating of described the first channel; And
Described data-signal is applied to a power adjusting factor to adjust the transmitted power of described data-signal;
Or described pseudo-channel precoding and power adjustment processing comprise:
Determine pseudo-channel pre-coding matrix
Figure RE-FSB0000119636180000014
wherein
Figure RE-FSB0000119636180000015
represent channel estimating contrary of described second channel,
Figure RE-FSB0000119636180000016
represent the channel estimating of described the first channel; And
The pseudo-channel pre-coding matrix of determining is normalized and is applied to described data-signal.
2. method according to claim 1, is characterized in that, described method also comprises:
Obtain the channel estimating of described second channel.
3. method according to claim 1, is characterized in that, described power adjusting factor is ρ 2/ ρ 1, wherein ρ 1represented counting of the first channel path loss of transmitted power, ρ 2represent the path loss that has counted transmitted power of second channel.
4. method according to claim 1, is characterized in that, described power adjusting factor is greater than 1.
5. method according to claim 1, is characterized in that, described mobile communication system is supported relaying, and described the first channel is the down channel that described user terminal is arrived in base station, and described second channel is the down channel that via node arrives described user terminal.
6. method according to claim 5, it is characterized in that, described mobile communication system is supported Type II relaying, and described the first channel is the down channel that the evolution Node B in 3GPP LTE-A arrives described user terminal, and described second channel is the down channel that via node arrives described user terminal.
7. a mobile communication system, comprising: the first equipment, the second equipment and user terminal, and wherein said the first equipment is the first channel to the down channel of described user terminal, described the second equipment is second channel to the down channel of described user terminal;
Described the first equipment sends the reference signal for channel estimating by the first channel;
Described the second equipment sends data-signal by second channel;
Described the second equipment is before sending described data-signal, described data-signal is carried out to pseudo-channel precoding and power adjustment processing, with the data-signal that makes described user terminal can use the correctly demodulation of channel estimating of described the first channel of determining according to the reference signal receiving to receive;
Wherein, described pseudo-channel precoding and power adjustment processing comprise:
Determine pseudo-channel pre-coding matrix
Figure RE-FSB0000119636180000021
and be applied to described data-signal, wherein
Figure RE-FSB0000119636180000022
represent channel estimating contrary of described second channel,
Figure RE-FSB0000119636180000023
represent the channel estimating of described the first channel; And
Described data-signal is applied to a power adjusting factor to adjust the transmitted power of described data-signal;
Or described pseudo-channel precoding and power adjustment processing comprise:
Determine pseudo-channel pre-coding matrix
Figure RE-FSB0000119636180000024
wherein
Figure RE-FSB0000119636180000025
represent channel estimating contrary of described second channel,
Figure RE-FSB0000119636180000026
represent the channel estimating of described the first channel; And
The pseudo-channel pre-coding matrix of determining is normalized and is applied to described data-signal.
8. mobile communication system according to claim 7, is characterized in that, described the second equipment also obtains the channel estimating of described second channel.
9. mobile communication system according to claim 7, is characterized in that, described power adjusting factor is ρ 2/ ρ 1, wherein ρ 1represented counting of the first channel path loss of transmitted power, ρ 2represent the path loss that has counted transmitted power of second channel.
10. mobile communication system according to claim 7, is characterized in that, described power adjusting factor is greater than 1.
11. mobile communication system according to claim 7, is characterized in that, described mobile communication system is supported relaying, and described the first equipment is base station, and described the second equipment is via node.
12. mobile communication system according to claim 11, is characterized in that, described mobile communication system is supported Type II relaying, and described the first equipment is the evolution Node B in 3GPP LTE-A, and described the second equipment is via node.
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