CN101124743B - A method and system for establishing fast feedback channel and transmitting information in a wireless communication system - Google Patents

Abstract

A method of transmitting information in a wireless communication system is disclosed. More specifically, the method includes a base station (BS) which receives data from a mobile subscriber station (MSS) via an uplink channel. Using the received data, the BS determines quality of the uplink channel. Thereafter, the BS transmits feedback information to the MSS. Here, the feedback information is based on the determined quality of the uplink channel.

Description

In wireless communication system, set up the method and system of the fast feedback channel and the information of transmission

Technical field

The present invention relates to set up the method for the feedback channel and the information of transmission, more particularly, the present invention relates in having the wireless communication system of many antennas, set up the method for the fast feedback channel and the information of transmission.

Background technology

In OFDM/OFDM (OFDM/OFDMA) system, support the base station (BS) of many antennas to obtain emission diversity gain by receiving feedback information from mobile subscriber station (MSS).Feedback information comprises weighted value or channel information.Here, send feedback information from MSS to BS by ul transmissions high speed (or fast) feedback channel.

Particularly, feedback information relates to various definite (measurement) information of BS transmission signals.Feedback information provides BS information necessary, so that send transmission signals more accurately.Here, determine that information can comprise the various determined values of downlink transmission signal.For example, under the situation of multiple-input and multiple-output (MIMO), the determined value of down link signal can be signal to noise ratio (S/N) value or weighting or selected mode value (space time transmit diversity or spatial multiplexing).

Fig. 1 has described the MSS that realizes and has sent the example of feedback information to BS in downlink transmission, this feedback information comprises weighted value (or channel information).As shown in fig. 1, BS uses a plurality of antennas, and BS notifies Space Time Coding (STC) pattern by STC area I E message to MSS.Determine the STC pattern based on the antenna amount that BS had.Simultaneously, BS notifies this BS plan to use which kind of matrix-type (for example, type B) to MSS.Multiple-input and multiple-output (MIMO) down link (DL) basic I E message is that BS is used for notifying its plan to use the means of which kind of matrix-type to MSS.Further, BS distributes IE message by the enhancing of channel quality indicating channel (CQICH), will be assigned to the mapping scheme of the weighted value of up link high-speed feedback channel to the MSS notice.

On the other hand, MSS determines downlink channel quality, perhaps determines to obtain weighting matrix W based on this downlink channel quality.According to the STC scheme, the quantity by the BS transmit antenna and the quantity of output signal are determined the size of weighting matrix.Following formula 1 is the example about the weighting matrix W of 4 BS transmit antennas and 2 STC outputs.

[formula 1]

$W=\left[\begin{array}{c}{w}_{11}{w}_{12}\\ w_{21}{w}_{22}\\ w_{31}{w}_{32}\\ w_{41}{w}_{42}\end{array}\right]$

MSS sends the weighting matrix W that through type 1 obtains and the feedback (S12) of channel quality information through CQICH.In order to improve the signal to noise ratio (snr) of BS, use the BS receiving downlink determined value or the weighted value of a plurality of transmit antennas at receiving terminal.Simultaneously, BS distributes up link CQICH to MSS, so that receiving downlink determined value or weighted value.

In addition, in existing 802.16 OFDMA systems, with the distribution of messages of the fast feedback channel of up link to uplink time slot.Here, uplink time slot is represented a sub-channel region, and this subchannel zone comprises three code elements, and it is made up of 6 small pieces (tile).The time slot of IEEE 802.16 OFDMA systems is meant the minimum unit that can be used for data allocations, can represent time slot in time domain and subchannel territory.And small pieces comprise 8 data subcarriers.

The form 1 that provides has below shown a kind of method of modulating the subcarrier of fast feedback channel.And form 2 has shown each the vectorial sub-carrier modulation method in the form 1 that is applied to.

[form 1]

4 bit Payloads	For each small pieces, by the vector index (small pieces 0, small pieces 1... small pieces 5) of fast feedback channel use
		0b0000	0，0，0，0，0，0
0b0001	1，1，1，1，1，1
		0b0010	2，2，2，2，2，2
0b0011	3，3，3，3，3，3
		0b0100	4，4，4，4，4，4
0b0101	5，5，5，5，5，5
		0b0110	6，6，6，6，6，6
0b0111	7，7，7，7，7，7
		0b1000	0，1，2，3，4，5
0b1001	1，2，3，4，5，6
		0b1010	2，3，4，5，6，7
0b1011	3，4，5，6，7，0
		0b1100	4，5，6，7，0，1
0b1101	5，6，7，0，1，2
		0b1110	6，7，0，1，2，3
0b1111	7，0，1，2，3，4

[form 2]

Vector index	The data subcarriers modulator approach of each vector index (subcarrier 0, subcarrier 1... subcarrier 7)
		0	P0，P1，P2，P3，P0，P1，P2，P3
1	P0，P3，P2，P1，P0，P3，P2，P1
		2	P0，P0，P1，P1，P2，P2，P3，P3
3	P0，P0，P3，P3，P2，P2，P1，P1
		4	P0，P0，P0，P0，P0，P0，P0，P0
5	P0，P2，P0，P2，P0，P2，P0，P2
		6	P0，P2，P0，P2，P2，P0，P2，P0
7	P0，P2，P2，P0，P2，P0，P0，P2

[0015]

Be below and the relevant equation of every kind of modulation scheme (P0, P1, P2, P3) with respect to form 2.

$\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H05828175220070226E000042.png,H05828175220070226E000051.png"\; state="\{\{state\}\}">P</figure-callout>}0=\frac{1}{\sqrt{2}}\&CenterDot;\exp (j\&CenterDot;\frac{\mathrm{\&pi;}}{4})$

$\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H05828175220070226E000031.png"\; state="\{\{state\}\}">P</figure-callout>}1=\frac{1}{\sqrt{2}}\&CenterDot;\exp (j\&CenterDot;\frac{3\mathrm{\&pi;}}{4})$

$\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="H05828175220070226E000031.png"\; state="\{\{state\}\}">P</figure-callout>}2=\frac{1}{\sqrt{2}}\&CenterDot;\exp (-j\&CenterDot;\frac{3\mathrm{\&pi;}}{4})$

$P3=\frac{1}{\sqrt{2}}\&CenterDot;\exp (-j\&CenterDot;\frac{\mathrm{\&pi;}}{4})$

Use the MSS of a plurality of antennas to have to receive feedback information, so that realize transmit diversity from BS.Feedback information comprises up link determined value (channel information or weighted value).Yet, also do not have the channel of definition that the BS determined value can be fed back to fast MSS.

Summary of the invention

Therefore, the present invention is devoted to a kind of method of setting up the fast feedback channel and the information of transmission in wireless communication system, and this method can fully eliminate because the one or more problems that the restriction of prior art or defective produce.An object of the present invention is to provide the method for the information that in wireless communication system, sends.

Another object of the present invention provides a kind of method that receives information in wireless communication system.

Another object of the present invention provides a kind of wireless communication system that sends information.Another object of the present invention provides a kind of method of setting up the fast feedback channel and the information of transmission.

Another object of the present invention provides a kind of method that receives the information of being sent out by the described fast feedback channel of setting up.

Attendant advantages of the present invention, purpose and feature are disclosed part in the narration hereinafter, those of ordinary skill in the art is when analyzing following content, attendant advantages of the present invention, purpose and feature will be understood to a certain extent, perhaps attendant advantages of the present invention, purpose and feature can be understood from the practice of the present invention.By the structure that in the specification of putting down in writing and claims and accompanying drawing, particularly points out, can realize and obtain purpose of the present invention and other advantage.

In order to realize these purposes and other advantage, according to purpose of the present invention, as the description of concrete and broad sense in this article, the method of transmission information in providing in a kind of base station (BS) at wireless communication system, this wireless communication system comprises base station (BS), and the base station is by the data of uplink channel reception from mobile subscriber station (MSS).Use the data that receive, BS determines the quality of uplink channel.After this, BS divides the physical resource be used in the down link fast feedback channel, and the wherein said physical resource that is used for the down link fast feedback channel is different with the physical resource that is used for data channel; And set up modulating mode for the down link fast feedback channel, wherein said modulating mode is the sub-carrier modulation pattern; But also come to send feedback information to MSS based on the modulating mode of the down link fast feedback channel of being set up.Here, feedback information is based on the quality of this uplink channel of determining.

In another aspect of the present invention, a kind of method that receives information in wireless communication system is provided, this wireless communication system comprises mobile subscriber station (MSS), this mobile subscriber station sends to base station (BS) by uplink channel with data.After this, MSS receives feedback information from BS based on the modulating mode of down link fast feedback channel.Here, feedback information is based on the quality of uplink channel, the quality of this uplink channel is based on the data of transmission and determines, wherein, physical resource by the down link fast feedback channel of base station assigns is different with the physical resource that is used for data channel, and the modulating mode of wherein being set up by the base station for the down link fast feedback channel is the sub-carrier modulation pattern.

Be appreciated that the general description of front of the present invention and following detailed all are exemplary with indicative, they are confirmed as providing the further explanation to invention required for protection.

Description of drawings

Accompanying drawing has been described embodiments of the invention, and drawing and description combine with the principle of the present invention that lays down a definition, and the accompanying drawing that is comprised provides further understanding of the present invention, and accompanying drawing is in conjunction with in this application and constitute the application's a part.

Fig. 1 has described the example of mobile subscriber station to base station transmission feedback information, and this feedback information is included in the weighted value of obtaining in the downlink transmission (or channel information);

Fig. 2 has described according to embodiments of the invention, and BS is to the example of MSS transmission feedback information in the OFDM/OFDMA system, and this feedback information comprises the result of uplink channel quality assessment;

Fig. 3 has described the example that the up link value of determining is set to the appointment physical resource of fast feedback channel;

Fig. 4 has described the example of the IE message format of the downlink high speed feedback channel that uses expansion DIUC;

Fig. 5 has described the example of the IE message format of the downlink high speed feedback channel that uses OFDMA DIUC value;

Fig. 6 is an example of describing the form of CQICH DL position IE message, and this IE message comprises weighted value and the channel information of BS;

Fig. 7 is the topology example that is described in the wireless communication system of the operation of transmission/reception information between BS and the MSS;

Fig. 8 has described the example of the basic allocation unit of fast feedback channel in the pattern of subchannel downlink portion use (PUSC);

Fig. 9 has described the example of all using the basic allocation unit of fast feedback channel in the pattern of (FUSC) at the subchannel down link;

Figure 10 has described the example of the composition of data subcarriers;

Figure 11 has described the example of the composition of data subcarriers.

Embodiment

To carry out detailed reference to the preferred embodiments of the present invention now, be described in the drawings example of the present invention.Under possible situation, all will use identical Reference numeral to represent identical or similar part in the accompanying drawing.Embodiments of the invention can be applied to OFDM/OFDM (OFDM/OFDMA) system, can also be applied to the wireless communication system of other standard.The example of the relevant embodiment of the invention is provided below.

In an embodiment of the present invention, base station (BS) sends feedback information by quick (or at a high speed) downlink feedback channel to mobile subscriber station (MSS).This feedback information comprises channel quality information (CQI) and the weighted value that receives by uplink channel.In operation, BS is used for sending the fast downlink feedback channel of data to the MSS notice.After this, BS sets up CQI or the weighted value for the fast downlink feedback channel, and sends this information to MSS.

Preferably, by DIUC message or down link (DL) fast feedback channel IE message, carry out to MSS notice fast downlink feedback channel.Here, send CQI or weighted value by CQI channel (CQICH) DL position IE message.

Fig. 2 has described according to embodiments of the invention, and BS is to the example of MSS transmission feedback information in the OFDM/OFDMA system, and this feedback information comprises the result of uplink channel quality assessment.In Fig. 2, as mentioned above, BS distributes STC pattern by STC area I E message to MSS based on the quantity of BS transmit antenna.Simultaneously, MSS obtains weighting matrix (W=N _tX M _t).Weighting matrix is based on the quantity of BS transmit antenna and the quantity of output signal, derives from the STC scheme.And BS is that MSS distributes up link high-speed feedback channel, is also referred to as CQICH.

Subsequently, MSS is via the CQICH that is distributed, to BS notice weighting matrix (W=N _tXM _t), the result, BS just can obtain emission diversity gain by receive the weighted value of each channel from MSS.Yet in order to allow the MSS that uses a plurality of antennas obtain emission diversity gain, this MSS has to from the feedback information of BS reception about uplink channel quality value (channel information or weighted value).In other words, receive downlink channel quality assessed value (channel information or weighted value) afterwards in execution these steps (S10-S13) and BS from MSS, BS will send to MSS about the feedback information of uplink channel quality assessed value (channel information or weighted value).

Further, BS uses DIUC or DL fast feedback channel IE message, to MSS notice high-speed down link feedback channel (S14).As shown in Figure 3, BS sends uplink channel quality assessed value (channel information or weighted value) (S15) to MSS on the appointment specific position (or space) of high-speed down link feedback channel.

Fig. 4 and Fig. 5 have described and have been used for the example of BS to the form of the IE message of MSS notice high-speed down link feedback channel.Here, Fig. 4 is to use the example of expansion DIUC, and Fig. 5 is to use the example of OFDMA DIUC value.

Further, Fig. 6 has described the example of the form of CQICH DL position IE message, and this IE message comprises weighted value and the channel information of BS.Here, each CQICH position IE occupies a down link (DL) time slot, as shown in Figure 3, DIUC=14 or DL fast feedback channel IE is distributed to the high-speed down link feedback channel.

Fig. 7 is the example of the structure of wireless communication system, and this wireless communication system has been described the operation of transmission/reception information between BS and MSS.More particularly, BS is by receiver 21, via the data of uplink channel reception from MSS, so that determine the quality of uplink channels by controller 20.BS for example can receive the data and the information of data and other type, can determine channel status and/or quality by these data and information.Then, BS can use transmitter 22 to send feedback information to MSS.Here, feedback information is based on the quality of definite uplink channel.

For executive communication, MSS at first sends data to BS by transmitter 14.Determine the quality of uplink channels and after transmitter 22 sends at the controller 20 of BS, the feedback information that the receiver 13 of MSS receives from BS.

An alternative embodiment of the invention relates to distributes the physics channel space, so that upwards provide feedback channel at downlink side, also relate to the sub-carrier modulation method that defines feedback channel, so that BS can send feedback information to MSS by the feedback channel of definition, this feedback information is included in quality information and the weighted value that receives in the ul transmissions.

Fig. 8 has described the example of the basic allocation unit of fast feedback channel in the pattern of subchannel downlink portion use (PUSC).Fig. 9 has described the example of all using the basic allocation unit of fast feedback channel in the pattern of (FUSC) at the subchannel down link.In IEEE802.26 OFDMA system, descending chain circuit frame provides PUSC and FUSC pattern basically.

The PUSC pattern provides a kind of replacement scenario, only uses the subchannel of part whereby in sending data.As shown in Figure 8, the time slot of PUSC pattern has been represented the subchannel be made up of two code elements and four clusters (cluster).Further, each cluster has 12 data subcarriers.

The FUSC pattern provides a kind of replacement scenario, uses in sending data all whereby or all subchannels.As shown in Figure 9, as in the PUSC pattern, the time slot of FUSC pattern has represented to comprise the subchannel of a code element and 48 data subcarriers.Further, in PUSC pattern and FUSC pattern, each time slot all has 48 data subcarriers.

In the present embodiment, as the situation in the fast feedback channel of down link direction, the fast feedback channel that a time slot allocation is made progress to downlink side.In other words, the time slot of indicating in Fig. 1 and Fig. 2 can be represented as the basic allocation unit in the physical channel space of fast feedback channel.Because PUSC pattern and FUSC pattern include 48 data subcarriers, therefore, although these two kinds of patterns there are differences in form, but still can adopt identical modulator approach.Figure 10 and Figure 11 have described the example of the composition of data subcarriers.In Figure 10 and Figure 11, data subcarriers can be divided into 6 little cohorts (group).Further, each little cohort comprises 8 subcarriers.By adopting this set, the down link fast feedback channel can use the composition of uplink fast feedback channel.Form 3 has been described the sub-carrier modulation method according to the feedback channel of the embodiment of the invention.

[form 3]

4 bit Payloads	For each little cohort, by the vector index (group of group 0, the group of group 1... group of group 5) of fast feedback channel use
		0b0000	0，0，0，0，0，0
0b0001	1，1，1，1，1，1
		0b0010	2，2，2，2，2，2
0b0011	3，3，3，3，3，3
		0b0100	4，4，4，4，4，4
0b0101	5，5，5，5，5，5
		0b0110	6，6，6，6，6，6
0b0111	7，7，7，7，7，7
		0b1000	0，1，2，3，4，5
0b1001	1，2，3，4，5，6
		0b1010	2，3，4，5，6，7
0b1011	3，4，5，6，7，0
		0b1100	4，5，6，7，0，1
0b1101	5，6，7，0，1，2
		0b1110	6，7，0，1，2，3
0b1111	7，0，1，2，3，4

In form 3, can change sequential combination according to the vector index of Payload and little cohort (0-5).Following form 4 has shown each the vectorial data subcarriers modulator approach that is used for form 3.

[form 4]

Vector index	The data subcarriers modulation technique of each vector index (subcarrier 0, subcarrier 1... subcarrier 7)
		0	P0，P1，P2，P3，P0，P1，P2，P3
1	P0，P3，P2，P1，P0，P3，P2，P1
		2	P0，P0，P1，P1，P2，P2，P3，P3
3	P0，P0，P3，P3，P2，P2，P1，P1
		4	P0，P0，P0，P0，P0，P0，P0，P0
5	P0，P2，P0，P2，P0，P2，P0，P2
		6	P0，P2，P0，P2，P2，P0，P2，P0
7	P0，P2，P2，P0，P2，P0，P0，P2

According to embodiments of the invention, the fast feedback channel modulation can be used various modulation techniques, such as binary phase shift keying (BPSK), orthogonal PSK (QPSK) and 16 quadrature amplitude modulation (16QAM).(P2 P3) has shown the example of the QPSK technology that is applied to the OFDM/OFDMA system to every kind of modulation technique of form 4 for P0, P1.Further, the modulation order that can change according to each vector index in the form 4 makes up.

For the BS that is described in the wireless communication system that is used for the information that sends and the operation of the another kind transmission/reception information between the MSS, will use structure and number designation thereof among Fig. 7 to explain this operation.In operation, the controller 20 of BS distributes physical resource for the down link fast feedback channel, and by the modulating mode of this BS foundation to the down link fast feedback channel.Here, the physical resource of down link fast feedback channel is the physical resource that is different from data channel, and the corresponding feedback information of modulating mode.After this, the transmitter 22 of BS sends modulating mode to MSS.

At MSS, receiver 13 receives the modulating mode that (BS) sends from the base station.Here, the modulating mode that the controller 20 of BS is set up the down link fast feedback channel, the corresponding feedback information of this modulating mode.When receiving, the controller 10 of MSS detects the modulating mode that sends from BS, and determines by the feedback information of modulating mode from the BS transmission.After determining feedback information, the transmitter 14 of MSS sends uplink data to BS, and this uplink data is by using feedback information to dispose.

Those of ordinary skill in the art will understand, under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications and change to the present invention.Therefore, if modification of the present invention and change are belonged in the scope of appended claim book and their equivalents, will be understood that so the present invention contained these modifications and the change of this invention.

Claims (8)

1. the method for transmission information in the base station (BS) in wireless communication system, this method comprises:

By the data of uplink channel reception from mobile subscriber station (MSS);

Based on the data that receive, determine the quality of uplink channel; Divide the physical resource be used in the down link fast feedback channel, the wherein said physical resource that is used for the down link fast feedback channel is different with the physical resource that is used for data channel;

Foundation is for the modulating mode of down link fast feedback channel, and wherein said modulating mode is the sub-carrier modulation pattern;

Modulating mode based on the down link fast feedback channel of being set up sends to MSS with feedback information, and wherein this feedback information is based on the quality of determined uplink channel.

2. according to the process of claim 1 wherein that described feedback information comprises the channel quality information (CQI) of uplink channel.

3. the method for reception information in the mobile subscriber station at wireless communication system (MSS), this method comprises:

By uplink channel data are sent to base station (BS);

Receive feedback information from BS based on the modulating mode of down link fast feedback channel, wherein this feedback information is based on the quality of uplink channel, and wherein determines the quality of uplink channel based on the data of described transmission,

Wherein, different by the physical resource of the down link fast feedback channel of base station assigns with the physical resource that is used for data channel, and the modulating mode of wherein being set up by the base station for the down link fast feedback channel is the sub-carrier modulation pattern.

4. according to the method for claim 3, wherein said feedback information comprises the channel quality information (CQI) of uplink channel.

5. method that in wireless communication system, sends and receives information, this method comprises:

Via uplink channel, data are sent to base station (BS) by mobile subscriber station (MSS);

Via uplink channel, receive the data of sending by BS from MSS;

BS determines the quality of uplink channel based on the data that receive;

Divide the physical resource be used in the down link fast feedback channel by BS, the wherein said physical resource that is used for the down link fast feedback channel is different with the physical resource that is used for data channel;

By the modulating mode of BS foundation for the down link fast feedback channel, wherein said modulating mode is the sub-carrier modulation pattern; Based on the modulating mode of the down link fast feedback channel of being set up feedback information is sent to MSS by BS, wherein said feedback information is based on the quality of determined uplink channel;

MSS receives the feedback information that sends from described BS.

6. according to the method for claim 5, wherein said feedback information comprises the channel quality information (CQI) of uplink channel.

7. wireless communication system that sends information, this system comprises base station (BS), this base station (BS) comprising:

Receiver is used for via the data of uplink channel reception from mobile service station (MSS);

Controller, be used for determining the quality of uplink channel based on the data that receive, and divide the physical resource that is used in the down link fast feedback channel, the wherein said physical resource that is used for the down link fast feedback channel is different with the physical resource that is used for data channel, and controller is further configured the modulating mode of setting up for the down link fast feedback channel, and wherein said modulating mode is the sub-carrier modulation pattern; Transmitter is used for based on the modulating mode of the down link fast feedback channel of being set up feedback information being sent to MSS, and wherein said feedback information is based on the quality of determined uplink channel.

8. wireless communication system that receives information, this system comprises mobile service station (MSS), this mobile service station (MSS) comprising:

Transmitter is used for via uplink channel data being sent to base station (BS);

Receiver is used for the modulating mode receiving feedback information based on the down link fast feedback channel from BS, and wherein said feedback information is based on the quality of uplink channel, and wherein determines the quality of described uplink channel based on the data of described transmission,

Wherein, different by the physical resource of the down link fast feedback channel of base station assigns with the physical resource that is used for data channel, and the modulating mode of wherein being set up by the base station for the down link fast feedback channel is the sub-carrier modulation pattern.

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