KR101653637B1 - Apparatus and method for efficiently operating fast feedback channel in wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for operating an efficient fast feedback channel in a wireless communication system. A method for a base station to operate a fast feedback channel in a wireless communication system according to the present invention includes checking a MFM (MIMO Feedback Mode) of one or more fast feedback channels to be canceled among a plurality of previously assigned fast feedback channels And activating a bit corresponding to the identified MFM in the MFM deallocation bitmap field in the downlink control signal, and transmitting the downlink control signal to the terminal.

Description

[0001] APPARATUS AND METHOD FOR EFFICIENTLY OPERATING FAST FEEDBACK CHANNEL IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for efficiently operating a fast feedback channel in a wireless communication system, and more particularly, to a system and method for operating a fast feedback channel in a wireless communication system based on an Orthogonal Frequency Division Multiple Access (OFDMA) To an apparatus and method for efficient allocation and termination of a fast feedback channel.

In the 4th Generation (4G) communication system, which is a next generation communication system, a service having various Quality of Service (hereinafter referred to as 'QoS') is provided to users by using a transmission rate of about 100 Mbps Active research is underway. Particularly, in the 4G communication system, a mobile communication system such as a wireless local area network (WLAN) system and a wireless metropolitan area network (WMAN) system is applied to a broadband wireless access (BWA) And support for high-speed services in a form of ensuring QoS are being actively researched. The representative communication system is IEEE (Institute of Electrical and Electronics Engineers) 802.16 system. The IEEE 802.16 system uses an Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division Multiplexing (OFDM) scheme to support a broadband transmission network in a physical channel. (Hereinafter referred to as " OFDMA ") scheme.

A typical IEEE 802.16m wireless communication system based on the OFDMA scheme is configured to transmit a control signal of a Feedback Allocation Advanced-MAP Information Element (IE) to instruct a terminal to allocate and cancel a fast feedback channel. Lt; / RTI > Currently, the Feedback Allocation A-MAP IE can manage one fast feedback channel. When a new fast feedback channel is allocated, a feedback period, an allocation duration, a physical location of a fast feedback channel, and feedback information to be transmitted through a fast feedback channel are transmitted through a feedback allocation A-MAP IE Type and so on. Here, the kind of the feedback information is determined through the MFM (MIMO Feedback Mode) field.

The termination of an already assigned fast feedback channel can be accomplished in two ways. In the first scheme, the allocation duration field is set to a specific interval in the feedback allocation A-MAP IE when a fast feedback channel is allocated, and is automatically terminated when the corresponding allocation interval ends. The second scheme is a scheme in which the base station forcibly terminates. This is accomplished by newly transmitting and receiving a Feedback Allocation A-MAP IE with an allocation duration field set to 0b000.

The current D3 standard has a structure in which the existing fast feedback channel is automatically canceled when a new fast feedback channel is allocated through the Feedback Allocation A-MAP IE. That is, there is a constraint that only one fast feedback channel exists per UE. If there is no such constraint for the operation of multiple fast feedback channels, the process of terminating and assigning a fast feedback channel becomes inefficient. That is, if there are a plurality of fast feedback channels pre-allocated to the UE and the UE desires to cancel some or all of the fast feedback channels, the BS transmits a Feedback Allocation A-MAP IE corresponding to the number of channels to be canceled do. In addition, if a new fast feedback channel is to be allocated, the feedback allocation A-MAP IE indicating a new allocation should be transmitted once again.

Accordingly, when a plurality of fast feedback channels per UE are operated in a wireless communication system based on the OFDMA scheme, efficient allocation and termination of fast feedback channels are required.

It is an object of the present invention to provide an apparatus and method for efficiently operating a fast feedback channel in a wireless communication system.

It is another object of the present invention to provide an apparatus and method for efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on OFDMA.

It is another object of the present invention to provide a method and apparatus for allocating a new fast feedback channel using a downlink control signal when operating a plurality of uplink fast feedback channels per terminal in a wireless communication system based on the OFDMA scheme, And a method for selectively canceling a plurality of fast feedback channels assigned to the fast feedback channel.

It is another object of the present invention to provide a method and apparatus for transmitting information on an existing fast feedback channel, which is required to be canceled in a downlink control signal, to a bit- map format, thereby providing an apparatus and a method for instructing a terminal to cancel a desired number of fast feedback channels.

It is a further object of the present invention to provide a fast feedback channel that is used in a conventional OFDMA wireless communication system by using a MFM field in a feedback allocation A- The present invention provides an apparatus and method for distinguishing a fast feedback channel by associating an MFM sequence of a channel with a position in a bit-map.

It is a further object of the present invention to provide a method and apparatus for operating a plurality of uplink fast feedback channels per UE in a wireless communication system based on the OFDMA scheme, And to provide an apparatus and method for distinguishing feedback channels by connecting MFM sequences and positions within a bit-map.

According to a first aspect of the present invention, there is provided a method of operating a feedback channel in a wireless communication system, the method comprising: receiving, from among a plurality of feedback channels allocated to the UE, Determining a feedback information type of the feedback channels based on the feedback information type, activating a bit corresponding to the confirmed feedback information type in the deallocation bitmap field in the downlink control signal, transmitting the downlink control signal to the terminal Wherein the feedback information type having the smallest value among the feedback information types of the plurality of feedback channels allocated to the plurality of feedback channels corresponds to the highest bit among the bits in the deallocation bitmap field.

According to a second aspect of the present invention, there is provided a method of operating a feedback channel in a wireless communication system, the method comprising: when a downlink control signal is received from a base station, Identifying one or more feedback channels that are requested to be canceled by using a feedback information type corresponding to the confirmed bit; Wherein the feedback information type having the smallest value among the feedback information types of the plurality of feedback channels assigned to the feedback channel corresponds to the highest bit among the bits in the deallocation bitmap field .

According to a third aspect of the present invention, an apparatus of a base station operating a feedback channel in a wireless communication system includes feedback information types of feedback channels of one or more feedback channels to be released among a plurality of feedback channels allocated to the terminal, A downlink control signal generator for activating a bit corresponding to the confirmed feedback information type in the deallocation bitmap field in the downlink control signal and a transmitter for transmitting the downlink control signal to the terminal, Here, the feedback information type having the smallest value among the feedback information types of the plurality of feedback channels allocated to the feedback channel corresponds to the highest bit among the bits in the deallocation bitmap field.

According to a fourth aspect of the present invention, an apparatus of a terminal operating a feedback channel in a wireless communication system includes a receiver for receiving a downlink control signal from a base station, Checking one or more feedback channels that are requested to be canceled by using a feedback information type corresponding to the confirmed bit, and identifying one or more feedback channels among the plurality of feedback channels that have been previously allocated, Wherein the feedback information type having the smallest value among the feedback information types of the plurality of feedback channels allocated to the UE is a feedback information type having a highest priority bit among the bits in the deallocation bitmap field .

In the case of operating a plurality of uplink fast feedback channels per terminal in a wireless communication system based on the OFDMA scheme, information on existing fast feedback channels that are required to be canceled in the downlink control signal is included in a bit-map format It is possible to instruct a terminal to cancel a desired number of fast feedback channels, and to efficiently manage a plurality of fast feedback channels.

1 is a block diagram illustrating a configuration of a base station in a wireless communication system based on OFDMA scheme according to the present invention;
FIG. 2 is a block diagram illustrating a configuration of a UE in a wireless communication system based on an OFDMA scheme according to the present invention;
3 illustrates an operation method of a base station for efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on the OFDMA scheme according to the first embodiment of the present invention. In one flow chart,
4 is a flowchart illustrating a method of efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on the OFDMA scheme according to the first embodiment of the present invention. In one flow chart,
5 illustrates an operation method of a base station for efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on OFDMA scheme according to a second embodiment of the present invention. In one flow chart,
6 illustrates an operation method of a UE for efficiently allocating and canceling a fast feedback channel when a plurality of fast feedback channels are operated per UE in a wireless communication system based on OFDMA scheme according to a second embodiment of the present invention. In one flow chart,
7 illustrates an operation method of a base station for efficiently allocating and canceling feedback channels when a plurality of fast feedback channels per UE are operated in a wireless communication system based on OFDMA scheme according to a third embodiment of the present invention Flow chart, and
8 is a flowchart illustrating a method of efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on an OFDMA scheme according to a third embodiment of the present invention. A flow chart.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, the present invention proposes a scheme for efficiently allocating and canceling a fast feedback channel when a plurality of fast feedback channels are operated per terminal in a wireless communication system based on an OFDMA scheme. Here, the wireless communication system will be described by taking an IEEE 802.16m wireless communication system as an example, but it is applicable to all systems that operate a plurality of fast feedback channels per terminal.

In particular, in order to efficiently allocate and terminate a fast feedback channel, the present invention proposes a method for including information on a conventional fast feedback channel, which is required to be canceled in the Feedback Allocation A-MAP IE, in a bit-map format. In the current fast feedback channel allocation scheme, there is no unique index indicating each allocation, so additional index allocation and the like should be considered to inform it. To solve this problem, the present invention proposes to use an MFM field already used for fast feedback channel allocation. The fast feedback channels allocated to the UE will have different MFMs, so that the fast feedback channel can be distinguished using the MFM field. Even if there are a plurality of fast feedback channels having the same MFM, it is assumed that the same MFM is canceled at the same time in the present invention. Using the linkage of MFM and fast feedback channel classification, there is no need to consider additional index allocation for fast feedback channel classification.

Currently, there are 8 MFMs in the IEEE 802.16m wireless communication system, so an 8-bit bit-map can be used. If the number of fast feedback channels that can be allocated per terminal is limited to eight or less, a bit-map having a maximum allowable number of channels can be used instead. In this case, the MFM sequence of the currently assigned fast feedback channel can be concatenated with the position in the bit-map. For example, if the maximum allowable number of channels is 3 and the current terminal is operating three fast feedback channels for MFM0, MFM5, and MFM3 in order, the bit-map indicating the cancellation can have a 3-bit length The first bit of the bit-map may indicate a fast feedback channel for MFM0, the second bit may be a fast feedback channel for MFM3, and the third bit may represent a fast feedback channel for MFM5. In this case, if the base station desires to cancel the fast feedback channel for the MFM 3 and maintain the remaining channel, it can set the bit-map to 0b010 and instruct the terminal. Here, the connection method of the MFM order of the fast feedback channel and the position in the bit-map may be reversed, and other connection methods may be considered. If a unique index for the fast feedback channel is allowed, the connection between the index and the bit-map can be applied in the same way.

As described above, by including the information on the existing fast feedback channel, which is required to be canceled in the Feedback Allocation A-MAP IE, in a bit-map format, it is possible to instruct the terminal to cancel a plurality of fast feedback channels. In one embodiment, the Feedback Allocation A-MAP IE can be configured as shown in Table 1 below. Table 1 below shows an example of canceling eight fast feedback channels.

Syntax Size in bits Description / Notes Feedback-Allocation-A-MAP_IE () { - - A-MAP IE Type 4 Feedback Allocation A-MAP IE = 0b0010 Channel Index 6 [10] Feedback channel index within the UL fast feedback control resource region Short-term Feedback Period (p) 3 [13] A feedback is transmitted on the FBCH every 2 ^p frames. Long-term Feedback Period (q) 2 [15] A long-term feedback is transmitted on the FBCH every 2 ^q short-term feedback opportunity.
If q = 0b00, the long-term feedback is not used. Frame offset 3 [18] The AMS starts reporting at the specified frame offset. If the current frame is specified, the AMS starts reporting in eight frames. Subframe index 3 [21] Indicate the UL subframe index in the UL portion of the frame Allocation Duration (d) 3 [24] A FBCH is transmitted on the FBCH channels indexed by Channel Index for 8 x 2 ^d frames. If d = 0b000, the FBCH is deallocated. If d = 0b111, the AMS should not report until the ABS command for the AMS to stop. ACK Allocation Flag 1 [25] Indicate if one ACK channel is allocated to acknowledge the successful detection of this IE. If (ACK Allocation Flag == 0b1) { HFA 3 [28] HARQ feedback channel allocation for feedback channel de-allocation confirmation } if (d = 0b000) {  MFM_deallocation_bitmap 8 [36] } else if (d! = 0b000) { MFM 3 [31] MIMO Feedback Mode MaxMt Variable
1-2 [33] Variable number of bits - depends on number of transmit antennas Nt

If Nt = 2 (Any MFM):
0b0: 1
0b1: 2

If Nt = 4 (Any MFM):
0b00: 1
0b01: 2
0b10: 3
0b11: 4

If Nt = 8 (SU-MIMO MFM 0, 1, 2, 3, 4):
0b00: 1
0b01: 2
0b10: 4
0b11: 8

If Nt = 8 (MU-MIMO MFMs 5, 6, 7):
0b00: 1
0b01: 2
0b10: 3
0b11: 4 If (MFM = 2, 3, 5, 6) {  Feedback Format 2 [35] } If (MFM = 0, 1, 4, 7) { FPI 2 [35] Frequency partition indication: ABS indication AMS to send wideband CQI and STC rate of the frequency partition and reuse factor in the future:
0b00: Frequency partition index 0
0b01: Frequency partition index 1
0b10: Frequency partition index 2
0b11: Frequency partition index 3 } If (MFM == 0,1 AND q! = 0b00) { Long term FPI 2 [37] Frequency partition indication: ABS indication AMS to send wideband CQI and STC rate for the second frequency partition using long term feedback:
0b00: Frequency partition index 0
0b01: Frequency partition index 1
0b10: Frequency partition index 2
0b11: Frequency partition index 3 } If (MFM == 3,4,6,7) { CL SU and MU MIMO CM 2 [37] Codebook Feedback Mode and Codebook Coordination Enable
0b00: base mode with CCE disabled
0b01: transformation mode with CCE disabled
0b10: differential mode with CCE disabled
0b11: base mode with CCE enabled CS 1 [38] Codebook subset if Nt = 4, otherwise CS shall be ignored.
0b0: report PMI from the base codebook or the transformed base codebook
0b1: report PMI from the codebook subset or transformed codebook subset } If (MFM == 0, 1, 2, 5) { Measurement Method Indication 1 [39] 0b0: Use the midamble for CQI measurements
0b1: Use pilots in OL region with MaxMt streams for CQI measurements } } Padding Variable Padding to reach byte boundary }

The A-MAP IE Type field in the Feedback Allocation A-MAP IE of Table 1 indicates the type of the A-MAP IE. In the present invention, 0b0010 is set to indicate the Feedback Allocation A-MAP IE. The Channel Index field indicates an index of a resource to be used in the uplink control signal interval. The Short-term Feedback Period (p) field indicates the period information in which the short-term feedback is transmitted, and the short-term feedback is transmitted every 2 ^p frames. The long-term feedback period (q) field indicates the period information in which the long-term feedback is transmitted, and the long-term feedback is transmitted every 2 ^q short-term feedback transmission period. The Frame offset field indicates offset information for starting transmission of the fast feedback after receiving the Feedback Allocation A-MAP IE. The subframe index field indicates the subframe information occupied by the fast feedback channel in the frame. The Allocation Duration (d) field indicates the interval information of the fast feedback, and the fast feedback is continuously transmitted during the 8 × 2 ^d frame interval. If d = 0b000, this means termination of the fast feedback channel. If d = 0b111, this means that the base station maintains the assignment of the fast feedback channel until it sends a cancellation indication. The ACK Allocation Flag field indicates whether to use the HARQ feedback channel when the fast feedback channel is canceled. The HFA field indicates the HARQ feedback channel to be allocated when the ACK Allocation Flag field is activated. The MFM deallocation bitmap field indicates the MFM corresponding to the existing fast feedback channel that needs to be canceled. The MFM field indicates a Multiple Input Multiple Output (MIMO) feedback mode. The MaxMt field indicates a maximum space-time codes (STC) rate, an MU (Multi User) rate, - The maximum number of users sharing the same resource in MIMO. The Feedback Format field indicates the detailed feedback format in MFM 2,3,5,6. The FPI field indicates a frequency band to be transmitted and a channel quality indicator (CQI) of a short-term fast feedback channel is to be transmitted. The long term FPI field represents the frequency partition information on which the long-term fast feedback channel measures and transmits the wideband CQI. The CM field indicates a codebook mode to be transmitted by the UE, and the CS field indicates a codebook type to be transmitted by the UE. The Measurement Method Indication field indicates a signal to which the UE should measure the CQI.

When the Feedback Allocation A-MAP IE of Table 1 is used, in order to instruct the cancellation of the previously allocated fast feedback channel, the Allocation Duration (d) field is set to 0b000 and the MFM deallocation bitmap field is additionally set . By so setting, the base station can simultaneously control a plurality of fast feedback channels. In addition, in the case of using the Feedback Allocation A-MAP IE of Table 1, the Allocation Duration (d) field is set to a value other than 0b000 in order to instruct allocation of a new fast feedback channel, Can be set. As described above, when using the Feedback Allocation A-MAP IE of Table 1, it is possible to allocate a new fast feedback channel or to control one of the existing multiple fast feedback channels to be canceled. Accordingly, in order to allocate a new fast feedback channel and to cancel a plurality of existing fast feedback channels, at least two feedback allocation A-MAP IEs are required to be transmitted.

In another embodiment, a Feedback Allocation A-MAP IE can be configured to control both the termination of a plurality of existing fast feedback channels and the assignment of a new fast feedback channel through transmission of one Feedback Allocation A-MAP IE . In this case, the Feedback Allocation A-MAP IE can be configured as shown in Table 2 below. Table 2 below shows an example of canceling a fast feedback channel when two fast feedback channels are allowed per UE, and thus the size of the MFM deallocation bitmap is 2 bits.

Syntax Size in bits Description / Notes Feedback-Allocation-A-MAP_IE () { - - A-MAP IE Type 4 Feedback Allocation A-MAP IE = 0b0010 Channel Index 6 [10] Feedback channel index within the UL fast feedback control resource region Short-term Feedback Period (p) 3 [13] A feedback is transmitted on the FBCH every 2 ^p frames. Long-term Feedback Period (q) 2 [15] A long-term feedback is transmitted on the FBCH every 2 ^q short-term feedback opportunity.
If q = 0b00, the long-term feedback is not used. Frame offset 3 [18] The AMS starts reporting at the specified frame offset. If the current frame is specified, the AMS starts reporting in eight frames. Subframe index 3 [21] Indicate the UL subframe index in the UL portion of the frame Allocation Duration (d) 3 [24] A FBCH is transmitted on the FBCH channels indexed by Channel Index for 8 x 2 ^d frames. If d = 0b000, the FBCH is deallocated. If d = 0b111, the AMS should not report until the ABS command for the AMS to stop. ACK Allocation Flag 1 [25] Indicate if one ACK channel is allocated to acknowledge the successful detection of this IE. If (ACK Allocation Flag == 0b1) { HFA 3 [28] HARQ feedback channel allocation for feedback channel de-allocation confirmation } MFM_deallocation_bitmap 2 [30] MFM 3 [33] MIMO Feedback Mode MaxMt Variable
1-2 [35] Variable number of bits - depends on number of transmit antennas Nt

If Nt = 2 (Any MFM):
0b0: 1
0b1: 2

If Nt = 4 (Any MFM):
0b00: 1
0b01: 2
0b10: 3
0b11: 4

If Nt = 8 (SU-MIMO MFM 0, 1, 2, 3, 4):
0b00: 1
0b01: 2
0b10: 4
0b11: 8

If Nt = 8 (MU-MIMO MFMs 5, 6, 7):
0b00: 1
0b01: 2
0b10: 3
0b11: 4 If (MFM = 2, 3, 5, 6) {  Feedback Format 2 [37] } If (MFM = 0, 1, 4, 7) { FPI 2 [37] Frequency partition indication: ABS indication AMS to send wideband CQI and STC rate of the frequency partition and reuse factor in the future:
0b00: Frequency partition index 0
0b01: Frequency partition index 1
0b10: Frequency partition index 2
0b11: Frequency partition index 3 } If (MFM == 0,1 AND q! = 0b00) { Long term FPI 2 [39] Frequency partition indication: ABS indication AMS to send wideband CQI and STC rate for the second frequency partition using long term feedback:
0b00: Frequency partition index 0
0b01: Frequency partition index 1
0b10: Frequency partition index 2
0b11: Frequency partition index 3 } If (MFM == 3,4,6,7) { CL SU and MU MIMO CM 2 [39] Codebook Feedback Mode and Codebook Coordination Enable
0b00: base mode with CCE disabled
0b01: transformation mode with CCE disabled
0b10: differential mode with CCE disabled
0b11: base mode with CCE enabled CS 1 [40] Codebook subset if Nt = 4, otherwise CS shall be ignored.
0b0: report PMI from the base codebook or the transformed base codebook
0b1: report PMI from the codebook subset or transformed codebook subset } If (MFM == 0, 1, 2, 5) { Measurement Method Indication 1 [40] 0b0: Use the midamble for CQI measurements
0b1: Use pilots in OL region with MaxMt streams for CQI measurements } Padding Variable Padding to reach byte boundary }

Here, the fields indicated by the respective fields in the Feedback Allocation A-MAP IE in Table 2 are the same as the corresponding fields in Table 1, and in the case of Table 2, within the Feedback Allocation A-MAP IE The MFM deallocation bitmap field is always included. Using the Feedback Allocation A-MAP IE of Table 2, even in the Feedback Allocation A-MAP IE informing of a new fast feedback channel allocation, using the MFM deallocation bitmap field, The desired channel can be canceled.

1 is a block diagram illustrating a configuration of a base station in a wireless communication system based on an OFDMA scheme according to the present invention.

As shown in the figure, the BS includes a scheduler 100, a feedback allocation A-MAP message generator 102, a channel encoder 104, a modulator 106, a resource mapper 108, an OFDM modulator 110, Frequency transmitter 112, as shown in FIG.

Referring to FIG. 1, the scheduler 100 schedules a previously allocated fast feedback channel and a new fast feedback channel for each UE, and outputs a scheduling result to a Feedback Allocation A-MAP message generator 102 do.

MAP message generator 102 generates a Feedback Allocation A-MAP message using the scheduling result from the scheduler 100 and transmits the generated Feedback Allocation A-MAP message to a channel encoder 104 Output. In particular, the Feedback Allocation A-MAP message generator 102 includes information on an existing fast feedback channel that is requested to be canceled in a feedback allocation A-MAP IE in a bit-map format, To the terminal. To this end, the Feedback Allocation A-MAP message generator 102 checks the MFMs of one or more fast feedback channels to be canceled and activates a bit corresponding to the identified MFM in the MFM deallocation bitmap field in the Feedback Allocation A- .

The channel encoder 104 encodes the information bit stream from the feedback allocation A-MAP message generator 102 to generate code symbols, and outputs the generated code symbols to the modulator 106.

The modulator 106 modulates the code symbols from the channel encoder 104 according to a predetermined modulation scheme to generate modulation symbols, and outputs the generated modulation symbols to the resource mapper 108.

The resource mapper 108 maps the data from the modulator 106 to predetermined resources and outputs the data to the OFDM modulator 110.

The OFDM modulator 110 OFDM-modulates the resource mapped data from the resource mapper 108 to generate an OFDM symbol, and outputs the generated OFDM symbol to the RF transmitter 112. Here, the OFDM modulation includes an IFFT (Inverse Fast Fourier Transform) operation, a CP (Cyclic Prefix) insertion, and the like.

The RF transmitter 112 converts the baseband signal from the OFDM modulator 110 into an RF signal and transmits the RF signal through an antenna.

FIG. 2 is a block diagram illustrating a configuration of a UE in a wireless communication system based on the OFDMA scheme according to the present invention. Referring to FIG.

As shown in the figure, the UE includes an RF receiver 200, an OFDM demodulator 202, a resource demapper 204, a demodulator 206, a channel decoder 208, and a Feedback Allocation A-MAP message processor 210 .

Referring to FIG. 2, the RF receiver 200 converts an RF signal received through an antenna into a baseband signal and outputs the baseband signal to an OFDM demodulator 202.

The OFDM demodulator 202 performs OFDM demodulation of the baseband signal from the RF receiver 200 to recover frequency-domain signals. Here, the OFDM demodulation includes CP (Cyclic Prefix) removal, Fast Fourier Transform (FFT), and the like.

The resource demapper 204 demaps the frequency domain signals from the OFDM demodulator 202 to extract complex symbols.

The demodulator 206 demodulates the complex symbols from the resource demapper 204.

The channel decoder 208 decodes the symbols from the demodulator 206 to recover an information bit stream.

The Feedback Allocation A-MAP message processor 210 processes the Feedback Allocation A-MAP message from the channel decoder 208. In particular, the Feedback Allocation A-MAP message processor 210 confirms information on an existing fast feedback channel which is included in the feedback allocation A-MAP IE in a bit-map format and which is requested to be canceled, terminate the fast feedback channel. To this end, the Feedback Allocation A-MAP message processor 210 identifies the active bit in the MFM deallocation bitmap field in the Feedback Allocation A-MAP IE, identifies the MFM corresponding to the confirmed bit, It determines that the fast feedback channel corresponding to the MFM is a fast feedback channel to be canceled, thereby terminating the existing fast feedback channel which is required to be canceled.

3 illustrates an operation method of a base station for efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on the OFDMA scheme according to the first embodiment of the present invention. It is a flow chart. Here, the first embodiment relates to a method of operating a fast feedback channel using the Feedback Allocation A-MAP IE of Table 1 above.

Referring to FIG. 3, in step 301, the BS determines whether it is required to cancel a previously allocated fast feedback channel and allocate a new fast feedback channel to the UE.

If it is determined in step 301 that the previously assigned fast feedback channel is requested to be canceled, the BS checks the MFMs of one or more fast feedback channels to be canceled in step 303.

In step 305, the BS activates a bit corresponding to the identified MFM in the MFM deallocation bitmap field in the feedback allocation A-MAP IE. Thus, it is possible to distinguish one or more fast feedback channels that desire to cancel among the previously assigned fast feedback channels.

In step 307, the BS sets the Allocation Duration field in the feedback allocation A-MAP IE to 0b000. This can inform the UE that the Feedback Allocation A-MAP IE is a message for canceling an already assigned fast feedback channel.

In step 309, the BS determines whether a procedure for checking the termination of the fast feedback channel is required.

If it is determined in step 309 that a confirmation procedure for canceling a fast feedback channel is required, the BS activates an ACK Allocation Flag field in the Feedback Allocation A-MAP IE in step 311 and allocates an HARQ feedback channel do.

In step 313, the BS transmits the Feedback Allocation A-MAP IE configured as described above to the UE.

In step 315, the BS determines whether an ACK is received from the MS through the allocated HARQ feedback channel.

In step 315, when it is determined that an ACK is received from the MS, the BS terminates the algorithm according to the present invention.

On the other hand, if it is determined in step 315 that an ACK is not received within a predetermined time from the UE, the BS returns to step 313 and repeats the following steps.

On the other hand, if it is determined in step 309 that a confirmation procedure for canceling the fast feedback channel is not required, the BS transmits the Feedback Allocation A-MAP IE configured as described above to the UE in step 317, And ends the algorithm.

On the other hand, if it is determined in step 301 that a new fast feedback channel is required to be allocated, the BS performs a normal function in step 319 to configure a feedback allocation A-MAP IE for a fast feedback channel to be allocated. Here, the Allocation Duration field in the Feedback Allocation A-MAP IE is set to a value other than 0b000. In step 321, the BS transmits the Feedback Allocation A-MAP IE to the UE and then terminates the algorithm according to the present invention.

4 is a flowchart illustrating a method of efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on the OFDMA scheme according to the first embodiment of the present invention. It is a flow chart. Here, the first embodiment relates to a method of operating a fast feedback channel using the Feedback Allocation A-MAP IE of Table 1 above.

Referring to FIG. 4, in step 401, the UE receives a feedback allocation A-MAP IE from a base station.

In step 403, the MS checks the Allocation Duration field in the received Feedback Allocation A-MAP IE to check whether it is set to 0b000. That is, it is checked whether the received Feedback Allocation A-MAP IE is a message for canceling a previously assigned fast feedback channel.

If it is determined in step 403 that the Allocation Duration field in the received Feedback Allocation A-MAP IE is set to 0b000, the terminal checks the MFM deallocation bitmap field in the received Feedback Allocation A-MAP IE in step 405 To identify the MFM to be canceled and the corresponding fast feedback channel. Here, the UE may determine an active bit in the MFM deallocation bitmap field, determine a MFM corresponding to the confirmed bit, and determine that the fast feedback channel corresponding to the identified MFM should be canceled .

In step 407, the terminal cancels the confirmed fast feedback channel.

In step 409, the MS determines whether an ACK Allocation Flag field in the feedback allocation A-MAP IE is active and an HARQ feedback channel is allocated through the HFA field.

If it is determined in step 409 that the ACK Allocation Flag field in the Feedback Allocation A-MAP IE is active and that the HARQ feedback channel is allocated through the HFA field, the UE proceeds to step 411 and transmits the allocated HARQ feedback After transmitting the ACK to the base station via the channel, the algorithm according to the present invention terminates.

On the other hand, if it is determined in step 409 that the ACK Allocation Flag field in the feedback allocation A-MAP IE is not activated, the terminal ends the algorithm according to the present invention.

On the other hand, if it is determined in step 403 that the Allocation Duration field in the received Feedback Allocation A-MAP IE is not set to 0b000, the UE determines whether the received Feedback Allocation A- It is determined that the message is a message for allocation, and in step 413, it performs a normal function to check allocation information on a new fast feedback channel through the received Feedback Allocation A-MAP IE, and then performs fast feedback according to the determined allocation information To the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

5 illustrates an operation method of a base station for efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on OFDMA scheme according to a second embodiment of the present invention. It is a flow chart. Here, the second embodiment relates to a method of operating a fast feedback channel using the Feedback Allocation A-MAP IE of Table 2 above.

Referring to FIG. 5, in step 501, the BS checks whether a previously terminated fast feedback channel and a new fast feedback channel are simultaneously requested to the UE.

If it is determined in step 501 that the existing fast feedback channel is canceled and the new fast feedback channel is simultaneously requested, the BS performs a normal function in step 503, Configure the Allocation A-MAP IE. Here, the Allocation Duration field in the Feedback Allocation A-MAP IE is set to a value other than 0b000.

In step 505, the BS checks MFMs of one or more fast feedback channels to be canceled.

In step 507, the BS activates a bit corresponding to the identified MFM in the MFM deallocation bitmap field in the feedback allocation A-MAP IE. Thus, it is possible to distinguish one or more fast feedback channels that desire to cancel among the previously assigned fast feedback channels.

In step 509, the BS determines whether a procedure for checking the termination of the fast feedback channel is required.

If it is determined in step 509 that a confirmation procedure for canceling a fast feedback channel is required, the BS activates an ACK Allocation Flag field in the Feedback Allocation A-MAP IE in step 511 and allocates an HARQ feedback channel do.

In step 513, the BS transmits the Feedback Allocation A-MAP IE configured as described above to the UE.

In step 515, the BS determines whether an ACK is received from the MS through the allocated HARQ feedback channel.

In step 515, when it is determined that an ACK is received from the MS, the BS terminates the algorithm according to the present invention.

On the other hand, if it is determined in step 515 that an ACK is not received within a predetermined time from the UE, the BS returns to step 513 and repeats the following steps.

On the other hand, if it is determined in step 509 that the confirmation procedure for canceling the fast feedback channel is not required, the BS transmits the Feedback Allocation A-MAP IE configured as described above to the UE in step 525, And ends the algorithm.

On the other hand, if it is determined in step 501 that both the cancellation of the already allocated fast feedback channel and the allocation of the new fast feedback channel are not requested at the same time, the base station transmits, in step 517, It checks whether revocation and allocation of a new fast feedback channel is required.

If it is determined in step 517 that the previously assigned fast feedback channel is requested to be canceled, the BS checks the MFM of one or more fast feedback channels to be canceled in step 519.

In step 521, the BS activates a bit corresponding to the identified MFM in the MFM deallocation bitmap field of the feedback allocation A-MAP IE.

After setting the Allocation Duration field in the feedback allocation A-MAP IE to 0b000 in step 523, the BS proceeds to step 509 and repeats the following steps.

On the other hand, if it is determined in step 517 that a new fast feedback channel is required to be allocated, the BS performs a normal function in step 527 to configure a feedback allocation A-MAP IE for a fast feedback channel to be allocated. Here, the Allocation Duration field in the Feedback Allocation A-MAP IE is set to a value other than 0b000. In step 529, the BS transmits the Feedback Allocation A-MAP IE configured as described above to the UE, and then terminates the algorithm according to the present invention.

6 illustrates an operation method of a UE for efficiently allocating and canceling a fast feedback channel when a plurality of fast feedback channels are operated per UE in a wireless communication system based on OFDMA scheme according to a second embodiment of the present invention. It is a flow chart. Here, the second embodiment relates to a method of operating a fast feedback channel using the Feedback Allocation A-MAP IE of Table 2 above.

Referring to FIG. 6, in step 601, the terminal receives a feedback allocation A-MAP IE from a base station.

In step 603, the MS checks the Allocation Duration field in the received Feedback Allocation A-MAP IE and determines whether the Allocation Duration field is set to 0b000.

If it is determined in step 603 that the Allocation Duration field in the received Feedback Allocation A-MAP IE is not set to 0b000, the terminal performs a normal function in step 605 and transmits the received Feedback Allocation A-MAP IE Feedback information on the new fast feedback channel, and transmits the fast feedback to the base station according to the determined allocation information, and then proceeds to step 607. In step 607,

On the other hand, if it is determined in step 603 that the Allocation Duration field in the received Feedback Allocation A-MAP IE is set to 0b000, the terminal directly proceeds to step 607. [

In step 607, the MS checks the MFM deallocation bitmap field in the received Feedback Allocation A-MAP IE to identify an MFM to be canceled and confirms a fast feedback channel corresponding to the identified MFM. Here, the UE may determine an active bit in the MFM deallocation bitmap field, determine a MFM corresponding to the confirmed bit, and determine that the fast feedback channel corresponding to the identified MFM should be canceled .

In step 609, the MS determines whether there is a fast feedback channel to be canceled.

If it is determined in step 609 that there is a fast feedback channel to be canceled, the terminal cancels the confirmed fast feedback channel in step 611.

In step 613, the MS determines whether an ACK Allocation Flag field in the feedback allocation A-MAP IE is active and an HARQ feedback channel is allocated through the HFA field.

If it is determined in step 613 that the ACK Allocation Flag field in the Feedback Allocation A-MAP IE is active and that an HARQ feedback channel is allocated through the HFA field, the UE proceeds to step 615 and transmits the allocated HARQ feedback channel And then terminates the algorithm according to the present invention.

On the other hand, if it is determined in step 613 that the ACK Allocation Flag field in the feedback allocation A-MAP IE is not activated, the terminal ends the algorithm according to the present invention.

On the other hand, if it is determined in step 609 that there is no fast feedback channel to be canceled, the terminal ends the algorithm according to the present invention.

Meanwhile, the present invention can be similarly applied to a MIMO extended header or a MAC (Media Access Control) control message, which is a feedback channel other than the fast feedback channel. That is, the present invention can be applied to a feedback polling A-MAP IE that manages a MIMO extension header and a MAC control message, which is another feedback channel for transmitting feedback information. Feedback Polling The A-MAP IE provides a method of indicating the type of feedback contents that the UE should transmit and informing all the information related to resource allocation that can be transmitted. Alternatively, the feedback polling A-MAP IE may be used to indicate only the types of feedback contents and information related to resource allocation that can be transmitted is a general resource allocation control signal UL Basic Assignment A-MAP IE or UL Subband Assignment A-MAP IE There is also a way to tell through. It is possible to allocate a plurality of feedback channels through a plurality of feedback polling A-MAP IEs and to allocate a plurality of feedback channels with one feedback polling A-MAP IE through a later modification. As described above, when there are a plurality of feedback channels, there is no specific indexing method for various feedback channels in both of the above methods. Accordingly, in this case, by applying the present invention, a specific feedback channel desired by the base station can be canceled. That is, the feedback channel can be canceled by using the MFM of the specific feedback channel.

Currently, there are eight MFMs in the IEEE 802.16m wireless communication system, so that a feedback channel of a specific MFM can be instructed to be terminated by using an 8-bit polling_deallocation_bitmap. For example, when the current terminal operates MFM0 to MFM7, if the polling_deallocation_bitmap is 0b10010000, it means canceling the feedback channel corresponding to MFM0 and MFM3. Meanwhile, the feedback polling A-MAP IE can allocate a feedback channel that transmits only a correlation matrix in addition to the feedback channel corresponding to the MFM. In this case, a polling_deallocation_bitmap in the feedback polling A-MAP IE may be defined as 0b00000000 in order to instruct the cancellation of the feedback channel transmitting only the correlation matrix. Alternatively, the size of the polling_deallocation_bitmap may be increased to 9 bits as shown in Table 3 below, and the last bit or the first bit may be used as the canceling bit of the feedback channel transmitting only the correlation matrix. In addition, a 10-bit polling_deallocation_bitmap may be considered to include a feedback channel for multi-BS MIMO. For example, the first to eighth bits of the polling_deallocation_bitmap indicate a fast feedback channel for MFM0 to MFM7, a feedback channel for transmitting only the correlation matrix at the ninth bit, and a multi-BS MIMO feedback channel for the tenth bit .

If the maximum number of feedback channels per UE is fixed to a certain number N, the polling_deallocation_bitmap size may be N bits. In this case, as in the above example of the Feedback Allocation A-MAP IE, it is possible to define a rule that the lowest MFM corresponds to the most significant bit in the bitmap. Here, the most significant bit is the most significant bit and may be referred to as MSB (most significant bit). In contrast to the case of the feedback allocation A-MAP IE, the feedback polling A-MAP IE needs to consider a feedback channel that transmits only the correlation matrix. However, since the maximum number of feedback channels is limited, The bitmap size need not be increased to include the termination of the bitmap. It simply promises a position indicating the cancellation of the feedback channel that transmits only the correlation matrix. This can be solved by connecting the MFM sequence of the currently assigned fast feedback channel with the position in the bit-map. For example, if the maximum allowable number of channels is 4, and the current terminal is operating in the order of MFM0, MFM2, and 3 feedback channels of the correlation matrix, the bit-map indicating the cancellation can have a 4-bit length The first bit of the bit-map may be a fast feedback channel for MFM0, the second bit may be a fast feedback channel for MFM2, and the third bit may be a fast feedback channel for the correlation matrix. Herein, the BS activates a bit corresponding to a feedback channel to be terminated, thereby instructing the UE to terminate the feedback channel. For example, if you want to cancel the feedback channel for MFM0 and the correlation matrix, you can indicate this by setting polling_deallocation_bitmap to 0b1010. If the current MS is allocated and operating a total of four feedback channels MFM0, MFM2, MFM5 and correlation matrix, the first bit of the bit-map is the fast feedback channel for the MFM0, the second bit is the MFM2 The third bit is a fast feedback channel for MFM5. The last bit is a fast feedback channel for the correlation matrix. In the same way as above, The corresponding bit can be activated to instruct the terminal to cancel the corresponding feedback channel.

Here, the Feedback Polling A-MAP IE can be configured as shown in Table 3 below. Table 3 below shows an example of the cancellation of nine fast feedback channels in MFM and correlation matrices. Here, the polling_deallocation_bitmap has a size of 9 bits, and the first to eighth bits are feedback channels for MFM0 to MFM7, and the ninth bit is a feedback channel for transmitting only the correlation matrix.

Syntax Size
in bits Notes A-MAP IE Type { 4 Feedback_Polling_IE  Allocation Duration (d) 3 The allocation is valid for 2 ^(d-1) superframes starting from the superframe defined by allocation relevance. If d == 0b000, the pre-scheduled feedback header transmission is released. If d == 0b111, the pre-scheduled feedback header transmission will be valid until the BS commands to release it.  Dedicated UL allocation One 0b0: No dedicated UL resource is allocated. BS shall provide UL allocation for the MIMO feedback IE transmission through UL A-MAP IE.
0b1: Dedicated UL resource is included in this IE  If (d == 0b000) {   If (Dedicated UL allocation == 0b0) {   Resource Index 11 Confirmation of the resource index for a previously assigned persistent resource that has been deallocated
5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index
Resource index includes location and allocation size   }   polling_deallocation_bitmap 9 MFMs set to 1 in MFM_deallocation_bitmap are deallocated
Last bit indicates the deallocation of correlation matrix   HFA 3 HARQ feedback channel allocation for feedback channel de-allocation confirmation   } else if (d! = 0b000) {   If (Dedicated UL allocation == 0b1) { I _SizeOffset 5 Offset used to compute burst size index     Resource Index 11 5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index
Resource index includes location and allocation size     MEF One MIMO encoder format for uplink feedback transmission
Non-adaptive precoding shall be used at the AMS.
0b0: SFBC
0b1: VE with Mt = 2 if Nt> 1, or VE with Mt = 1 if Nt = 1
Nt is the number of transmit antennas at the AMS.      }     Period (p) 3 Transmit feedback every 4 ^p frame.
The first report will start at the next frame.     MIMO_feedback_IE_type One 0b0: feedback for single-BS MIMO operation
0b1: feedback for multi-BS MIMO operation   If (MIMO_feedback_IE_type == 0b0) { Single-BS MIMO feedback request      Transmit_Correlation_Matrix One 0b0: feedback of the transmit correlation matrix is indicated by CM
0b1: feedback of the quantized BS transmit correlation matrix only
Transmit correlation matrix shall be feedback if CM = 0b1     If (Transmit_Correlation_Matrix == 0b0) { ABS requests AMS to feedback CQI and CSI for a specific MFM. MaxM _t Variable 1 or 2 Variable number of bits - depends on number of transmit antennas N _t at the ABS

If N _t = 2 (Any MFM):
0b0: 1
0b1: 2

If N _t = 4 (Any MFM):
0b00: 1
0b01: 2
0b10: 3
0b11: 4

If N _t = 8 (SU-MIMO MFM 0, 1, 2, 3, 4):
0b00: 1
0b01: 2
0b10: 4
0b11: 8

If N _t = 8 (MU-MIMO MFMs 5, 6, 7):
0b00: 1
0b01: 2
0b10: 3
0b11: 4      MFM 3 MIMO Feedback Mode for which the AMS shall transmit feedback.      If (MFM = 2, 3, 5, 6) { Feedback of CQI and CSI for localized resource units       Num_best_subbands 2 0b00: report all subbands
0b01: 1 best subband
_{0b10: min {6, Y SB} } best subbands
_{0b11: min {12, Y SB} } best subbands
1 < Num_best_subbands &lt; = Y _SB       }      If (MFM == 3,4,6,7) { Feedback of CQI and CSI for CL SU and MU MIMO       CM [TBD] [TBD]       CS One 0b0: report PMI from the base codebook
0b1: report PMI from the codebook subset       }     If (MFM = 0, 1, 2, 5) { Indication of report for OL region      Measurement Method Indication One 0b0: Use the midamble for CQI measurements
0b1: Use pilots in OL region with MaxM t streams for CQI measurements     }    }   }   Else { Multi-BS MIMO feedback request    TRU 2 Target RU indicating which RUs or which type of RU to work on for feedback

0b00: Latest best subbands reported for single BS MIMO
0b01: Whole bandwidth
0b10: FFR partition 0
0b11: boosted FFR partition    ICT 2 0b00: PMI restriction for single-BS precoding;
0b01: PMI recommendation for single-BS precoding;
0b10: CL-MD for multi-BS precoding;
0b11: Co-MIMO for multi-BS precoding;    CS One 0b0: report PMI from the base codebook
0b1: report PMI from the codebook subset    N_multiBS_reports 3 N_multiBS_reports indicates the number of reports.   If (ICT = 0b11) {    MaxUser 2 Maximum number of users supported in Co-MIMO in the same resource.
0b00: 2 users
0b01: 3 users
0b10: 4 users
0b11: reserved    }   }  } } Padding variable Padding to reach byte boundary }

Here, the Allocation duration (d) field in the feedback polling A-MAP IE in Table 3 indicates interval information on which a fast feedback channel is transmitted, and fast feedback is continuously transmitted during a superframe period. If d = 0b000, this means termination of the fast feedback channel. If d = 0b111, this means that the base station maintains the assignment of the fast feedback channel until it sends a cancellation indication. In the present invention, 0b0 is set in order to indicate that the feedback polling A-MAP IE is canceled for the already-allocated dedicated resource, and the assigned UL resource allocation field Lt; RTI ID = 0.0 &gt; 0b1 &lt; / RTI &gt; The Resource Index field indicates an index for a dedicated resource to be canceled. The polling deallocation bitmap field indicates the MFM and correlation matrix for the existing fast feedback channel that needs to be canceled. The HFA field indicates the HARQ feedback channel to be allocated. The Resource index field indicates uplink resource information for transmitting feedback information, and the MEF (MIMO Encoding format) field indicates a MIMO encoding format. The Period (p) field indicates the period information in which feedback is transmitted, and the feedback is transmitted every 4p frames. The MFM (MIMO feedback mode) field indicates the MIMO feedback mode. The MaxMt field indicates the maximum STC rate that the UE can feedback in SU-MIMO, the maximum number of users sharing the same resource in MU-MIMO, and the Num_best_subbands field indicates the number of best subbands to be feedbacked. The CM field indicates a codebook mode to be transmitted by the UE, and the CS field indicates a codebook type to be transmitted by the UE. The Measurement Method Indication field indicates a signal to which the UE should measure the CQI.

In addition, as shown in Table 4, it is possible to instruct the Feedback Polling A-MAP IE to cancel the feedback channel for the multi-BS MIMO in the same manner. If a multi-BS MIMO feedback channel can be allocated to a UE, such as feedback channels of a single-BS MIMO, if the maximum number of feedback channels is 4 and the UE has two MFMs and a correlation matrix If multi-BS MIMO and 4 feedback channels are allocated in sequence, the bit-map indicating the cancellation can have a 4-bit length. Here, the first and second bits of the bit-map are the fast feedback channel for the MFM of the single BS MIMO, the third bit is the fast feedback channel for the correlation matrix, and the fourth bit is the fast feedback channel. In the same manner as described above, the BS can instruct the UE to cancel the corresponding feedback channel by activating a bit corresponding to the feedback channel to be terminated.

Syntax Size
in bits Notes A-MAP IE Type { 4 Feedback_Polling_IE  Allocation Duration (d) 3 The allocation is valid for 2 ^(d-1) superframes starting from the superframe defined by allocation relevance. If d == 0b000, the pre-scheduled feedback header transmission is released. If d == 0b111, the pre-scheduled feedback header transmission will be valid until the BS commands to release it.  Dedicated UL allocation One 0b0: No dedicated UL resource is allocated. BS shall provide UL allocation for the MIMO feedback IE transmission through UL A-MAP IE.
0b1: Dedicated UL resource is included in this IE  If (d == 0b000) {   If (Dedicated UL allocation == 0b0) {   Resource Index 11 Confirmation of the resource index for a previously assigned persistent resource that has been deallocated
5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index
Resource index includes location and allocation size   }   polling_deallocation_bitmap 4 For singleBS and multiBS MIMO feedback deallocation
Order of bitmap is MFMs, correlation matrix, and multiBS MIMO.   HFA 3 HARQ feedback channel allocation for feedback channel de-allocation confirmation   } else if (d! = 0b000) {   If (Dedicated UL allocation == 0b1) { I _SizeOffset 5 Offset used to compute burst size index     Resource Index 11 5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index
Resource index includes location and allocation size     MEF One MIMO encoder format for uplink feedback transmission
Non-adaptive precoding shall be used at the AMS.
0b0: SFBC
0b1: VE with Mt = 2 if Nt> 1, or VE with Mt = 1 if Nt = 1
Nt is the number of transmit antennas at the AMS.      }     Period (p) 3 Transmit feedback every 4 ^p frame.
The first report will start at the next frame.     MIMO_feedback_IE_type One 0b0: feedback for single-BS MIMO operation
0b1: feedback for multi-BS MIMO operation   If (MIMO_feedback_IE_type == 0b0) { Single-BS MIMO feedback request      Transmit_Correlation_Matrix One 0b0: feedback of the transmit correlation matrix is indicated by CM
0b1: feedback of the quantized BS transmit correlation matrix only
Transmit correlation matrix shall be feedback if CM = 0b1     If (Transmit_Correlation_Matrix == 0b0) { ABS requests AMS to feedback CQI and CSI for a specific MFM. MaxM _t Variable 1 or 2 Variable number of bits - depends on number of transmit antennas N _t at the ABS

If N _t = 2 (Any MFM):
0b0: 1
0b1: 2

If N _t = 4 (Any MFM):
0b00: 1
0b01: 2
0b10: 3
0b11: 4

If N _t = 8 (SU-MIMO MFM 0, 1, 2, 3, 4):
0b00: 1
0b01: 2
0b10: 4
0b11: 8

If N _t = 8 (MU-MIMO MFMs 5, 6, 7):
0b00: 1
0b01: 2
0b10: 3
0b11: 4      MFM 3 MIMO Feedback Mode for which the AMS shall transmit feedback.      If (MFM = 2, 3, 5, 6) { Feedback of CQI and CSI for localized resource units       Num_best_subbands 2 0b00: report all subbands
0b01: 1 best subband
_{0b10: min {6, Y SB} } best subbands
_{0b11: min {12, Y SB} } best subbands
1 < Num_best_subbands &lt; = Y _SB       }      If (MFM == 3,4,6,7) { Feedback of CQI and CSI for CL SU and MU MIMO       CM [TBD] [TBD]       CS One 0b0: report PMI from the base codebook
0b1: report PMI from the codebook subset       }     If (MFM = 0, 1, 2, 5) { Indication of report for OL region      Measurement Method Indication One 0b0: Use the midamble for CQI measurements
0b1: Use pilots in OL region with MaxM t streams for CQI measurements     }    }   }   Else { Multi-BS MIMO feedback request    TRU 2 Target RU indicating which RUs or which type of RU to work on for feedback

0b00: Latest best subbands reported for single BS MIMO
0b01: Whole bandwidth
0b10: FFR partition 0
0b11: boosted FFR partition    ICT 2 0b00: PMI restriction for single-BS precoding;
0b01: PMI recommendation for single-BS precoding;
0b10: CL-MD for multi-BS precoding;
0b11: Co-MIMO for multi-BS precoding;    CS One 0b0: report PMI from the base codebook
0b1: report PMI from the codebook subset    N_multiBS_reports 3 N_multiBS_reports indicates the number of reports.   If (ICT = 0b11) {    MaxUser 2 Maximum number of users supported in Co-MIMO in the same resource.
0b00: 2 users
0b01: 3 users
0b10: 4 users
0b11: reserved    }   }  } } Padding variable Padding to reach byte boundary }

7 illustrates an operation method of a base station for efficiently allocating and canceling feedback channels when a plurality of fast feedback channels per UE are operated in a wireless communication system based on OFDMA scheme according to a third embodiment of the present invention FIG. The third embodiment relates to a method of operating a fast feedback channel using the feedback polling A-MAP IE of Table 3 or Table 4.

Referring to FIG. 7, in step 701, the BS determines whether it is required to cancel a previously allocated feedback channel and a new feedback channel.

If it is determined in step 701 that the previously allocated feedback channel is requested to be canceled, the BS sets the Allocation Duration field in the feedback polling A-MAP IE to 0b000 in step 703. Thus, the feedback polling A-MAP IE can notify the UE that the feedback channel is a message for canceling the previously allocated feedback channel.

Then, in step 705, the BS determines whether the dedicated resource allocated to the BS is revoked.

If it is determined in step 705 that the previously allocated dedicated resource is canceled, the BS sets the dedicated UL allocation field in the feedback polling A-MAP IE to 0b0 in step 707. [ Thus, the feedback polling A-MAP IE can notify the UE of the termination of the previously allocated dedicated resources.

In step 711, the BS sets allocation information for a dedicated resource to be released in the feedback polling A-MAP IE. In the polling deallocation bitmap field, the BS sets a bit corresponding to the MFM of one or more feedback channels And then proceeds to step 713. Thus, it is possible to distinguish one or more fast feedback channels that desire to cancel among the previously assigned fast feedback channels.

On the other hand, if it is determined in step 705 that the previously allocated general resource is canceled, the BS determines whether to release the dedicated resource in the feedback polling A-MAP IE in step 709, The BS activates a bit corresponding to the MFM of one or more feedback channels to be canceled in the general resource and then proceeds to step 713.

In step 713, the BS allocates an HARQ feedback channel through the HFA field in the feedback polling A-MAP IE. In step 715, the BS transmits the Feedback Polling A-MAP IE configured as described above to the UE.

In step 717, the BS determines whether an ACK is received from the MS through the allocated HARQ feedback channel.

In step 717, when it is determined that an ACK is received from the MS, the BS terminates the algorithm according to the present invention.

On the other hand, if it is determined in step 717 that an ACK is not received within a predetermined time from the UE, the BS returns to step 715 and repeats the following steps.

On the other hand, if it is determined in step 701 that a new feedback channel is required to be allocated, the BS sets the Allocation Duration field in the feedback polling A-MAP IE in step 719 as a period. This can inform the UE that the feedback polling A-MAP IE is a message for allocation of a new feedback channel.

In step 721, the BS determines whether it is an allocation for a new dedicated resource.

In step 721, when it is determined that the new dedicated resource is allocated, the BS sets the Dedicated UL allocation field in the feedback polling A-MAP IE to 0b1 in step 723. This can inform the UE that the feedback polling A-MAP IE is allocated for the new dedicated resource.

In step 725, the BS configures a feedback polling A-MAP IE including allocation information on a dedicated resource to be allocated in the feedback polling A-MAP IE and information on one or more feedback channels to be allocated, And transmits the configured Feedback Polling A-MAP IE to the UE in step 727.

On the other hand, if it is determined in step 721 that the allocation is for a new general resource, the BS determines information on one or more feedback channels to be allocated in the feedback polling A-MAP IE And then transmits the feedback Polling A-MAP IE configured in step 731 to the UE. In step 733, the Node B configures an additional control signal for resource allocation and periodically transmits the control signal to the UE.

Thereafter, the base station terminates the algorithm according to the present invention.

8 is a flowchart illustrating a method of efficiently allocating and canceling a fast feedback channel when operating a plurality of fast feedback channels per UE in a wireless communication system based on an OFDMA scheme according to a third embodiment of the present invention. It is a flow chart. The third embodiment relates to a method of operating a fast feedback channel using the feedback polling A-MAP IE of Table 3 or Table 4.

Referring to FIG. 8, in step 801, the UE receives a feedback polling A-MAP IE from a base station.

In step 803, the MS determines whether the Allocation Duration field in the received feedback Polling A-MAP IE is set to 0b000. That is, it is checked whether the received feedback Polling A-MAP IE is a message for canceling a previously assigned fast feedback channel.

If it is determined in step 803 that the Allocation Duration field in the received feedback Polling A-MAP IE is set to 0b000, the terminal sets the Dedicated UL allocation field in the feedback polling A-MAP IE to 0b0 in step 805 Check whether there is. That is, it is checked whether the received feedback Polling A-MAP IE is a message for revocation of a dedicated resource allocated in advance.

If it is determined in step 805 that the dedicated UL allocation field in the feedback polling A-MAP IE is not set to 0b0, the UE checks the polling deallocation bitmap field in the received Feedback Polling A-MAP IE in step 807 After confirming the MFM to be canceled and canceling the corresponding fast feedback channel, the flow proceeds to step 811. Here, the UE may determine an active bit in the polling deallocation bitmap field, determine a MFM corresponding to the confirmed bit, and determine that the fast feedback channel corresponding to the identified MFM should be canceled .

On the other hand, if it is determined in step 805 that the dedicated UL allocation field in the feedback polling A-MAP IE is set to 0b0, the UE determines in step 809 whether the dedicated polling A- And the polling deallocation bitmap field to check the MFM to be canceled, and the dedicated resource releases the corresponding fast feedback channel, and then proceeds to step 811. Here, the UE may determine an active bit in the polling deallocation bitmap field, determine a MFM corresponding to the confirmed bit, and determine that the fast feedback channel corresponding to the identified MFM should be canceled .

In step 811, the MS determines whether an HARQ feedback channel is allocated through the HFA field in the feedback polling A-MAP IE.

If it is determined in step 811 that the HARQ feedback channel is allocated through the HFA field in the feedback polling A-MAP IE, the UE proceeds to step 813 and transmits an ACK to the BS through the allocated HARQ feedback channel Then, the algorithm according to the present invention ends.

On the other hand, if it is determined in step 811 that the HARQ feedback channel is not allocated through the HFA field in the feedback polling A-MAP IE, the UE ends the algorithm according to the present invention.

On the other hand, if it is determined in step 803 that the Allocation Duration field in the received feedback Polling A-MAP IE is not set to 0b000, the UE generates a Dedicated UL allocation field in the feedback polling A-MAP IE in step 815 0.0 &gt; 0b1. &Lt; / RTI &gt; That is, it is checked whether the received feedback Polling A-MAP IE is a message for assignment to a new dedicated resource.

If it is determined in step 815 that the Dedicated UL allocation field in the feedback polling A-MAP IE is set to 0b1, the UE generates new dedicated resource allocation information and feedback channel allocation information And transmits feedback to the terminal according to the determined allocation information, and then terminates the algorithm according to the present invention.

On the other hand, if it is determined in step 815 that the Dedicated UL allocation field in the feedback polling A-MAP IE is not set to 0b1, the UE confirms new feedback channel assignment information in the feedback polling A-MAP IE in step 819 And configures feedback according to the confirmed allocation information and transmits the feedback to the terminal. In step 821, the MS periodically receives an additional control signal for resource allocation.

Thereafter, the terminal terminates the algorithm according to the present invention.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

A scheduler 100, a feedback allocation A-MAP message generator 102, a channel encoder 104, a modulator 106, a resource mapper 108, an OFDM modulator 110, an RF (Radio Frequency)

Claims (24)

A method of operating a base station (BS) in a wireless communication system,
Generating a message including a bitmap indicating at least one feedback channel to be de-allocated among feedback channels allocated to the UE;
And transmitting the message to the terminal,
Wherein each bit of the bitmap corresponds to each of the feedback channels,
Wherein the order of each bit in the bitmap is determined based on a feedback information type of each of the feedback channels,
The most significant bit (MSB) of the bitmap indicates whether to cancel the feedback channel for a multiple input multiple output (MIMO) feedback mode (MFM) having the smallest index among the feedback channels and,
If no feedback channel for the MFM is assigned to the MS, the MSB indicates whether to cancel the feedback channel for the correlation matrix,
Wherein if no feedback channel for the MFM and a feedback channel for the correlation matrix are assigned to the UE, the MSB indicates whether to cancel the feedback channel for multi-BS MIMO feedback.
delete The method according to claim 1,
Identifying a type of feedback information of at least one feedback channel to be deallocated among the feedback channels allocated to the UE;
And activating a bit corresponding to the feedback information type in the bitmap.
The method according to claim 1,
Wherein the feedback information type is any one of an MFM, a correlation matrix, and multiple base station MIMO feedback.
5. The method of claim 4,
Wherein the order of the feedback channels in the bitmap is a sequence of a feedback channel for at least one MFM, a feedback channel for a correlation matrix, and a feedback channel for multiple base station MIMO feedback.
A method of operating a terminal in a wireless communication system,
Receiving from a base station (BS) a message including a bitmap indicating at least one feedback channel to be de-allocated among feedback channels allocated to the UE; and,
And releasing at least one feedback channel indicated by the bitmap,
Wherein each bit of the bitmap corresponds to each of the feedback channels,
Wherein the order of each bit in the bitmap is determined based on a feedback information type of each of the feedback channels,
The most significant bit (MSB) of the bitmap indicates whether to cancel the feedback channel for a multiple input multiple output (MIMO) feedback mode (MFM) having the smallest index among the feedback channels and,
If no feedback channel for the MFM is assigned to the MS, the MSB indicates whether to cancel the feedback channel for the correlation matrix,
Wherein if no feedback channel for the MFM and a feedback channel for the correlation matrix are assigned to the UE, the MSB indicates whether to cancel the feedback channel for multi-BS MIMO feedback.
delete The method according to claim 6,
Identifying at least one activated bit in the bitmap;
Further comprising identifying at least one feedback channel for which de-allocation is required based on the at least one bit activated.
The method according to claim 6,
Wherein the feedback information type is any one of an MFM, a correlation matrix, and multiple base station MIMO feedback.
10. The method of claim 9,
Wherein the order of the feedback channels in the bitmap is a sequence of a feedback channel for at least one MFM, a feedback channel for a correlation matrix, and a feedback channel for multiple base station MIMO feedback.
A base station (BS) apparatus in a wireless communication system,
A generation unit configured to generate a message including a bitmap indicating at least one feedback channel to be de-allocated among feedback channels allocated to the UE;
And a transmitter for transmitting the message to the terminal,
Wherein each bit of the bitmap corresponds to each of the feedback channels,
Wherein the order of each bit in the bitmap is determined based on a feedback information type of each of the feedback channels,
The most significant bit (MSB) of the bitmap indicates whether to cancel the feedback channel for a multiple input multiple output (MIMO) feedback mode (MFM) having the smallest index among the feedback channels and,
If no feedback channel for the MFM is assigned to the MS, the MSB indicates whether to cancel the feedback channel for the correlation matrix,
And wherein if no feedback channel for the MFM and a feedback channel for the correlation matrix are assigned to the UE, the MSB indicates whether to deallocate the feedback channel for multi-BS MIMO feedback.
delete 12. The method of claim 11,
Wherein the generation unit identifies a feedback information type of at least one feedback channel to be allocated among the feedback channels allocated to the terminal and activates a bit corresponding to the feedback information type in the bit map.
12. The method of claim 11,
Wherein the feedback information type is any one of an MFM, a correlation matrix, and multiple base station MIMO feedback.
15. The method of claim 14,
Wherein the order of the feedback channels in the bitmap is a sequence of feedback channels for at least one MFM, feedback channels for a correlation matrix, feedback channels for multiple base station MIMO feedback.
A terminal apparatus in a wireless communication system,
A base station (BS) for receiving a message including a bitmap indicating at least one feedback channel to be de-allocated among feedback channels allocated to the UE; Wow,
And a processing unit for releasing at least one feedback channel indicated by the bitmap,
Wherein each bit of the bitmap corresponds to each of the feedback channels,
Wherein the order of each bit in the bitmap is determined based on a feedback information type of each of the feedback channels,
The most significant bit (MSB) of the bitmap indicates whether to cancel the feedback channel for a multiple input multiple output (MIMO) feedback mode (MFM) having the smallest index among the feedback channels and,
If no feedback channel for the MFM is assigned to the MS, the MSB indicates whether to cancel the feedback channel for the correlation matrix,
And wherein if no feedback channel for the MFM and a feedback channel for the correlation matrix are assigned to the UE, the MSB indicates whether to deallocate the feedback channel for multi-BS MIMO feedback.
delete 17. The method of claim 16,
Wherein the processing unit identifies at least one bit activated in the bitmap and identifies at least one feedback channel for which de-allocation is required based on the at least one bit activated.
17. The method of claim 16,
Wherein the feedback information type is any one of an MFM, a correlation matrix, and multiple base station MIMO feedback.
20. The method of claim 19,
Wherein the order of the feedback channels in the bitmap is a sequence of feedback channels for at least one MFM, feedback channels for a correlation matrix, feedback channels for multiple base station MIMO feedback. delete delete delete delete

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