KR101642071B1 - Method and apparatus for managing feedback in wireless cellular systems - Google Patents

Abstract

A method and apparatus for feedback management of a wireless cellular system are disclosed. The base station determines a feedback assignment index or a polling assignment index that uniquely identifies at least one of a feedback resource to be allocated and a pre-allocated feedback resource to be released, and transmits a feedback assignment A- MAP IE or a feedback polling A-MAP IE to the UE. The UE confirms that the specific feedback resource is allocated or released based on the feedback allocation index included in the feedback allocation A-MAP IE or the polling allocation index included in the feedback polling A-MAP IE.

Feedback, feedback A-MAP IE, feedback polling A-MAP IE, link adaptation, MIMO

Description

Field of the Invention [0001] The present invention relates to a feedback management method and apparatus for a wireless cellular system,

The present invention relates to wireless cellular systems and, more particularly, to a method and apparatus for allocating and de-allocating feedback resources.

The wireless cellular communication system may be implemented in a wireless communication system such as Adaptive Modulation and Coding (AMC), Multiple Input and Multiple Output (MIMO) transmission, dynamic switching between MIMO modes, single user and multiuser MIMO transmissions Such as dynamic switching between nodes, for example, for link adaptation. In order to support dynamic switching and link adaptation, a very large amount of feedback is required from a mobile station (MS) to a base station (BS). In order for the base station to perform the dynamic high-speed link adaptation, one terminal must simultaneously feed back various information related to various operation modes.

BACKGROUND OF THE INVENTION [0002] Conventional cellular communication systems generally disclose feedback operations in single mode operation, e.g., downlink control messages, allocation of uplink feedback channels, and definition of feedback content. Therefore, in the conventional cellular communication system, there is a problem that a single terminal can not support a feedback operation to support various operation modes.

The present invention provides a method and apparatus for supporting multiple feedback operations in a wireless cellular system.

The present invention provides a method and apparatus for individually allocating and releasing multiple feedback resources for a terminal in a wireless cellular system.

A method according to a preferred embodiment of the present invention comprises: A method for managing feedback by a base station in a wireless cellular system, the method comprising: determining a feedback resource index uniquely identifying at least one of a feedback resource to be allocated and a pre-allocated feedback resource to be released; And transmitting a feedback resource map (A-MAP) information element (IE) to the UE.

According to another embodiment of the present invention, there is provided a method comprising: A method of managing feedback by a terminal in a wireless cellular system, the method comprising: receiving a feedback resource map (A-MAP) information element (IE) from a base station; And extracting a feedback resource index that uniquely identifies at least one of the allocated feedback resources.

An apparatus according to a preferred embodiment of the present invention comprises: A base station apparatus for feedback management in a wireless cellular system, the base station apparatus comprising: a controller for determining a feedback resource index uniquely identifying at least one of a feedback resource to be allocated and a pre-allocated feedback resource to be released; And a transmitter for transmitting a feedback resource map (A-MAP) information element (IE) to the UE.

According to another embodiment of the present invention, there is provided an apparatus comprising: A terminal apparatus for feedback management in a wireless cellular system, comprising: a receiver for receiving a feedback resource map (A-MAP) information element (IE) from a base station; a feedback resource to be allocated from the feedback resource map IE, And a controller for extracting a feedback resource index that uniquely identifies at least one of the allocated feedback resources.

The present invention has the following effects.

By using feedback allocation A-MAP IE or feedback polling A-MAP IE to indicate deallocation of a specific feedback resource, it minimizes feedback downtime and supports multiple feedbacks on various feedback contents.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation of the present invention are described, and other background techniques are omitted so as not to disturb the gist of the present invention.

Reference will be made herein to a communication standard based on IEEE 802.16m in describing the feedback operation in a wireless cellular communication system. However, the multiple feedback assignment operation according to the present invention is not limited to a specific communication protocol or system configuration, and various modifications can be made without departing from the gist of the present invention. It is obvious to those skilled in the art, Of course, it is an issue.

1 is a block diagram illustrating a schematic configuration of a wireless cellular system according to a preferred embodiment of the present invention.

As shown in the figure, a terminal 102 located in a cell serving as a predetermined service area covered by the base station 104 transmits various feedback information to the base station 104 through an uplink (UL) resource for communication with the base station 104 104). The feedback information may basically include a measured signal strength level for a reference signal received from the base station and may perform operations such as adaptive modulation and coding (AMC), link adaptation and dynamic mode switching at the base station 104 . The type, format, period, and transmission scheme of the feedback information can be indicated by the feedback allocation information of the base station.

2 is a message flow diagram illustrating a feedback operation according to a preferred embodiment of the present invention.

Referring to FIG. 2, in step 210, the BS 204 transmits a downlink control message for allocating resources for feedback, that is, feedback resources, to the MS 202. In step 212, the UE 202 may transmit an acknowledgment (ACK) for allocation of feedback resources to the BS 204. The process 212 may be selectively performed by a system design or an instruction of the base station 204. In step 214, the feedback information is transmitted from the UE 202 to the BS through the allocated feedback resource.

The definition of the allocation of the feedback resources and the content of the feedback information may be provided by the communication protocol standard, the system design or the system operator. For example, in 802.16m, the feedback information includes a codebook or an uplink sounding such as a MIMO matrix or a precoding matrix, and a signal-to-interference and noise ratio (MIMO) matrix to support a downlink (DL) (CQI) such as a channel quality information (CQI) such as Signal to Interference and Noise Ratio (SINR), space-time coding (STC) rate information information).

The feedback resources may have various types and may include, for example, specialized fast feedback channels (PFBCH) such as a primary fast feedback channel (PFBCH) and a secondary fast feedback channel (SFBCH) Extended feedback headers, and Media Access Control (MAC) control messages. Extended feedback headers and MAC control messages may be appended to data packets transmitted on uplink data channels.

The downlink control message for allocating the feedback resource to the UE may have various types. For example, a feedback allocation map (feedback allocation A-MAP) information element (IE) a feedback polling A-MAP IE, and a sounding command A-MAP IE. It goes without saying that a combination of the A-MAP IEs described above may be used to assign multiple feedback resources to the UE. Similarly, each of the above-described A-MAP IEs or a combination thereof can be used to de-allocate the feedback resource allocated to the UE.

3 is a flow diagram illustrating the allocation of feedback resources according to a preferred embodiment of the present invention.

Referring to FIG. 3, in step 302, the base station determines allocation or release of feedback resources for the UE. In step 304, a feedback polling A-MAP IE or a feedback allocation A-MAP Generate IE. In step 306, the generated A-MAP IE is transmitted to the UE. In step 308, an ACK for the A-MAP IE may be received from the terminal according to an instruction by the A-MAP IE or a preset operation. In step 310, the base station receives feedback information from the terminal through the feedback resource.

Each of the feedback polling A-MAP IE and the feedback assignment A-MAP IE indicates the following key information.

- Feedback content

- Feedback period

- Uplink resources for feedback transmission

The above information may be indicated explicitly or implicitly by the feedback assignment / polling A-MAP IE. As an example, the terminal may determine, via a function of the information and other parameters indicated by the feedback polling A-MAP IE, whether the feedback content is to be transmitted via an extended feedback header or via a MAC control message.

The feedback assignment A-MAP IE is used to allocate or de-allocate fast feedback channels, i.e. PFBCH or SFBCH. All the fast feedback channels allocated to be released by the feedback assignment A-MAP IE are automatically released if the specific feedback assignment index is not indicated. Also, when a new feedback resource is allocated by the feedback assignment A-MAP IE, all pre-assigned fast feedback channels are automatically released. If the base station can not request feedback for multiple MIMO feedback modes over multiple fast feedback channels, it is clear that performance constraints are imposed on performing optimal link adaptation.

4 is a flowchart illustrating a procedure for allocating and releasing a feedback resource using a feedback assignment A-MAP IE according to an embodiment of the present invention.

Referring to FIG. 4, in step 402, the UE receives a feedback assignment A-MAP IE through a designated downlink subframe, for example, a subframe #n of every frame, and in step 404, And checks whether the included allocation duration parameter d is a specific value indicating the release of the feedback resource, for example, '0b000'. The allocation interval parameter indicates the time when the feedback resource is used, and when it is '0b000', it means that the feedback resource is released. If it is '0b000', the process proceeds to step 406, and if not, the process proceeds to step 414.

In step 406, the UE confirms that the feedback resource is released using the uplink fast feedback channel index, and proceeds to step 408 so that an ACK allocation flag included in the feedback allocation A-MAP IE It is confirmed whether the ACK channel is set to a specific value indicating that the channel is allocated, for example, '0b1'. As an example, the ACK allocation flag may be set to a value for the feedback assignment A-MAP IE if the newly assigned fast feedback channel occupies the same physical resource as the pre-assigned high-speed feedback channel with different feedback content (i.e., different MIMO feedback mode) And is set to the specific value to explicitly confirm successful reception. If it is set to '0b1', the process proceeds to step 412, and the UE transmits an ACK for the release of the feedback resource. Otherwise, it determines that ACK is not transmitted in step 410.

In step 414, the UE confirms that the feedback resource is allocated using the uplink fast feedback channel index and the MIMO feedback mode, and releases all the previously assigned fast feedback channels. At this time, the UE can confirm the allocated resources by checking the allocated resources according to the feedback allocation A-MAP IE received previously, or further receiving a separate allocation IE. In step 416, the UE confirms whether the ACK allocation flag included in the feedback assignment A-MAP IE is set to a specific value indicating that the ACK channel is allocated, e.g., '0b1'. If it is set to '0b1', the process proceeds to step 420, and the UE transmits feedback through the feedback resource and transmits an ACK for allocation of the feedback resource. Otherwise, it determines that ACK is not transmitted in step 418.

As shown in Fig. 4, the release of the feedback resource is implicitly indicated by setting the assignment interval parameter d to a specific value, or by assigning a new fast feedback channel. It is clear that if one uses a feedback assignment A-MAP IE that does not include a specific feedback assignment index, one or more fast feedback channels can not be assigned to one UE within a given time. Only one MIMO feedback mode can be assigned.

Similar to the feedback allocation A-MAP IE described above, the feedback polling A-MAP IE can allocate feedback resources with or without dedicated uplink resources. If a dedicated uplink resource is not allocated at the time of allocating the feedback content, the feedback information is transmitted through an extended feedback header or MAC control message that can be piggybacked on the data burst allocated by another control message. The feedback polling A-MAP IE also specifies the periodicity of the feedback and the feedback content. The base station may transmit a plurality of feedback polling A-MAP IEs having the same feedback period and no dedicated uplink resources, in order to request a plurality of different feedback contents for one UE. As an example, the base station may perform feedback of CQI for wide open-loop MIMO and CQI and precoding matrix index for subband closed-loop MIMO so that the scheduler can obtain appropriate information for adaptation of MIMO mode. Lt; / RTI > PMI).

When the base station requests release of the feedback resource, problems of complexity and inefficiency may arise due to the processes being handled by the base station. In the case where a dedicated uplink resource is allocated for feedback, the corresponding feedback period is set to '0' to instruct the release of the corresponding resource. In this case, the UE can clearly know which feedback request is released. On the other hand, when dedicated uplink resources are not allocated, it may not be clear which particular feedback resource the base station desires to release among all the feedback resources currently allocated to the UE. In this case, if the feedback period is set to '0' simply for releasing the feedback resource, the UE determines that all previously allocated feedback resources should be released. In this case, the base station is liable to reallocate all of the feedback resources that it did not want to release.

FIG. 5 is a flowchart illustrating a procedure for allocating and releasing feedback resources using the feedback polling A-MAP IE according to an embodiment of the present invention.

Referring to FIG. 5, in step 502, the UE receives a feedback polling A-MAP IE through a designated downlink subframe, for example, a subframe #n of every frame. In step 504, the UE receives the feedback polling A- , It is confirmed whether the included allocation interval parameter (d) is a specific value indicating the release of the feedback resource, for example, '0b000'. If '0b000', the process proceeds to step 506; if not, the process proceeds to step 516.

In step 506, the UE determines whether a dedicated UL allocation field included in the feedback polling A-MAP IE is a specific value indicating assignment, for example, '0b1'. If the allocation is not indicated, in step 508, the UE releases the periodic feedback resource without resource indicator of the base station, and confirms the uplink ACKCH allocated by the base station. In step 510, the UE transmits an ACK for release of the feedback resource on the uplink ACK channel. If the dedicated uplink allocation field indicates allocation, in step 512, the UE releases all pre-allocated feedback resources and identifies the uplink ACKs allocated by the BS. In step 514, the UE transmits an ACK for release of the feedback resource on the uplink ACK channel.

In step 516, the UE determines whether the dedicated uplink allocation field included in the feedback polling A-MAP IE is a specific value indicating assignment, for example, '0b1'. If '0b1', the process proceeds to step 518; otherwise, the process proceeds to step 522. In step 518, the UE confirms that the feedback resource is allocated using a dedicated uplink resource index, the sub-frames of the dedicated uplink subframes, every 4 ^p-th frame is given as an example according to the resource index in step 520 #n Lt; RTI ID = 0.0 > feedback. Where p is a value that can be specified by the feedback polling A-MAP IE.

In step 522, the UE confirms that a feedback resource is allocated without a dedicated uplink resource index. At this time, the UE can confirm the allocated resources by checking the allocated resources according to the feedback polling A-MAP IE received previously or receiving additional allocated IEs. In step 524, UE determines the uplink resource in a subframe #n in every 4 ^p-th frame as the given sub-frame, an example having the appropriate size. To this end, the UE confirms the size of the uplink resource allocated for the data packet from the data channel allocation IE received from the base station. In step 526, the UE determines whether the uplink resource is available or valid. If it is valid, the UE proceeds to step 528, and if not, the UE proceeds to step 530.

In step 528, the UE transmits feedback information through the allocated feedback resource. In step 530, the terminal transmits a bandwidth (BW) request to the base station for feedback, checks 532 the uplink resource allocated for feedback from the base station in the next frame, and then uses the allocated resource And transmits feedback information.

As shown in FIG. 5, when the periodic feedback resource is released without indicating the uplink resource, all feedback resources are actually released because the UE can not identify which specific feedback resource should be released. Then the dynamic link adaptation operation is interrupted until the base station reestablishes the necessary feedback resources to the UE since there is no feedback for a specific time period.

In the following, embodiments of the present invention for achieving optimal link adaptation by simultaneously supporting multiple feedback assignment and release for a single terminal will be described. In the embodiments described below, a feedback manager and related control parameters and downlink control messages are defined. As the downlink control messages, a feedback assignment A-MAP IE and a feedback poll A-MAP IE will be described.

The feedback manager may be provided in the base station and the terminal. The base station has one feedback manager for each of its associated terminals. The feedback manager controls a feedback management database that stores a list of current feedback resources currently maintained for the terminal. Depending on the type of downlink control message used, each feedback resource is associated with a unique allocation index or a unique resource index. When a specific feedback resource having a unique allocation index or a resource index is allocated or released to the corresponding UE, the feedback manager of the base station stores the corresponding information in the database stored in the base station. The feedback manager of the terminal also updates the relevant information in the database when specific feedback resources are allocated or released from the base station, so as to match the information stored in the base station's database.

In the 802.16m system, an example of the database maintained by the feedback manager for the corresponding terminal is shown in Table 1 below.

Allocation index / Resource index Allocation IE Status Parameters of the allocation Feedback_allocation_index = 0 Feedback Allocation A-MAP IE Allocated PFBCH with channel index 3 for MFM 0, with a period of 4 frames. Feedback_allocation_index = 1 Feedback Allocation A-MAP IE Allocated SFBCH with channel index 5 for MFM 3, with a period of 1 frame. Feedback_allocation_index = 2 Feedback Allocation A-MAP IE Allocated SFBCH with channel index 7 for MFM 7, with a period of 4 frames. Feedback_allocation_index = 3 Feedback Allocation A-MAP IE Non-allocated Not applicable Polling_allocation_index = 0 Feedback Polling A-MAP IE Allocated Assignment of correlation matrix feedback header with a period of 4 frames, without a dedicated uplink resource. Polling_allocation_index = 1 Feedback Polling A-MAP IE Allocated Assignment of MIMO feedback MAC control message for MFM 1 with a period of 4 frames, without a dedicated uplink resource. Polling_allocation_index = 2 Feedback Polling A-MAP IE Non-allocated Not applicable Polling_allocation_index = 3 Feedback Polling A-MAP IE Non-allocated Not applicable Resource index = 36 (11 bits)
(Resource index includes location and allocation size) Feedback Polling A-MAP IE Allocated Assignment of MIMO feedback MAC control message for MFM 1 with a period of 4 frames. Resource index = 37 (11 bits)
(Resource index includes location and allocation size) Feedback Polling A-MAP IE Allocated Assignment of MIMO feedback MAC control message for MFM 5 with a period of 1 frame.

In the example of Table 1, four unique indices are used for feedback allocation using the feedback assignment A-MAP IE and four unique indexes are used for feedback allocation using the feedback polling A-MAP IE . Additional feedback resources using the feedback polling A-MAP IE may be uniquely identified according to a unique resource index. For each feedback assignment index (Feedback_Allocation_Index) or each polling assignment index (Polling_Allocation_Index), the type and state of the associated assignment IE and the assignment related parameters are stored. The type of the associated allocation IE means the feedback assignment A-MAP IE or the feedback polling A-MAP IE, the state means Allocated or Non-allocated, and the assignment related parameters are the MIMO feedback mode (MFM And a feedback period and the like.

In the above example, it can be seen that the base station has allocated the PFBCH for feedback of MFM 0 and the SFBCH for feedback of MFM 3. Therefore, the base station may use a robust distributed subcarrier allocation with a space-frequency block code, or a fast closed-loop precoding spatial multiplexing scheme with optimal subband selection, depending on the reported channel conditions for each possible transmission scheme data rate closed-loop precoding spatial multiplexing scheme).

In addition, the base station may choose to allocate an additional fast feedback channel, PFBCH or SFBCH, to the UE using feedback allocation index 3 by transmitting a feedback assignment A-MAP IE. The base station may also choose to release feedback resources for MFM 7 by sending a feedback assignment A-MAP IE with a feedback assignment index 2 and a de-allocation indication. Operations according to the feedback polling A-MAP IE are also performed.

For a more efficient release procedure, the base station can automatically release the feedback resource with feedback allocation index 2 by indicating a new allocation with a feedback allocation index of 2. In this case, the base station can simultaneously perform release and allocation of the feedback resource for a given feedback allocation index by using only one downlink control message.

Table 1 illustrates a case where 2 bits are reserved for the feedback allocation index or the polling allocation index. However, if N bits are specified for the feedback allocation index or the polling allocation index, Up to 2 ^N- 1 codewords can be used. The remaining one codeword is used for releasing all pre-allocated feedback resources and may not be used for allocation.

According to a preferred embodiment of the present invention, the feedback assignment index is included in the message transmitted via the feedback assignment A-MAP IE and the polling assignment index is included in the message transmitted via the feedback polling A-MAP IE.

Table 2 below shows the format of the feedback assignment A-MAP IE according to the preferred embodiment of the present invention. The various fields described below are merely examples, and the present invention is not limited thereto. The feedback assignment A-MAP IE may include appropriate fields according to the communication protocol standard to which the present invention applies, the system designer, or the operator's choice. Hereinafter, the information fields related to the preferred embodiment of the present invention will be described in detail.

Syntax Size in bits Description / Notes Feedback-Allocation-MAP_IE () { - - A-MAP IE Type 4 Feedback Allocation A-MAP IE = 0b0010 Channel Index Variable Feedback channel index within the UL fast feedback control resource region
(Dependent on L _{FB , FPi} ) Short-term Feedback Period ( p ) 3 A feedback is transmitted on the FBCH every 2 ^p frames Long-term Feedback Period ( q ) 2 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 The AMS starts reporting at the specified frame offset. If the current frame is specified, the AMS should start reporting in eight frames Allocation Duration ( d ) 3 A FBCH is transmitted on the FBCH channels indexed by Channel Index for 8 * 2 ^d frames. If d = 0b000, the FBCH is deallocated. If d = 0b111, the AMS should report until the ABS command for the AMS to stop. ACK Allocation Flag One Indicate if one ACK channel is allocated . If (ACK Allocation Flag == 0b1) { HFA 3 HARQ feedback channel allocation for feedback channel de-allocation confirmation } Feedback _ Allocation _ Index 2 Unique index assigned to this feedback channel allocation  (d! = 0b000), or referring to  a previously  assigned feedback channel for de - allocation  (d = 0b000). If  d = 0 b000 and Feedback _ Allocation _ Index  = 0b00, then all feedback allocations previously assigned with  a Feedback Allocation  A- MAP IE are de -allocated. If  d! = 0 b000 then Feedback _ Allocation _ Index shall be  different than  0 b00 . MaxMt Variable
1-2
Variable number of bits - depends on number of transmit antennas Nt

If Nt = 2 (SU-MIMO and MU-MIMO):
0b0: 1
0b1: 2

If Nt = 4 (SU-MIMO and MU-MIMO):
0b00: 1
0b01: 2
0b10: 3
0b11: 4

If Nt = 8 (SU-MIMO):
0b000: 1
0b001: 2
0b011: 4
0b111: 8

If Nt = 8 (MU-MIMO):
0b00: 1
0b01: 2
0b10: 3
0b11: 4 MFM 3 MIMO Feedback Mode If (MFM = 2, 3, 5, 6) { Feedback Format 2 } If (MFM = 0, 1, 4, 7) {    FPI 2 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 & Long-term Feedback Period! = 0b00) { Long term FPI 2 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 Codebook Feedback Mode and Codebook Coordination Enable

0b00: standard with CCE disabled
0b01: adaptive with CCE disabled
0b10: differential with CCE disabled
0b11: standard with CCE enabled CS One Codebook subset } If (MFM = 0, 1, 2, 5) { Measurement Method Indication One 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 MCRC 16 16 bit CRC masked by Station ID } - -

A channel index uniquely identifies a fast feedback channel in which a UE can transmit fast feedback information, and a 1: 1 relationship is established between the channel index and the UE. If the allocation period is '0b000' or the allocation period is not '0b000' and the channel index of the newly allocated FBCH is equal to the channel index of the released FBCH, the ACK allocation flag (ACK allocation flag) Can be set to '0b1'. A short-term feedback period (p) indicates that short-term feedback information is transmitted on the FBCH every 2 ^p frames. The long-term feedback period (q) indicates that the long-term feedback information is transmitted on the FBCH every 2 < ^{q >} short-term feedback time (opportunity). Long term feedback is not used when q is '0b00'. Allocation duration (d) means that the FBCH has a channel index of 8 * 2 ^d frames. If d is '0b111', the terminal continues to report feedback information until the ABC commands stop.

The MFM field indicates a MIMO feedback mode. The feedback format field indicates a feedback format index for reporting fast feedback information through the FBCH. A frequency partition indication (FPI) indicates a frequency part to be measured for a short- partition, and the long term FPI indicates the fraction of the frequency to be measured for long term reporting. MaxMt means the maximum rank fed back by the UE according to whether the MFM indicates a single user MIMO feedback mode or a multiuser MIMO feedback mode.

The feedback assignment index is used as a unique identifier associated with the assignment of feedback resources, and coexisting feedback resources can not have the same feedback assignment index. For example, if the UE supports up to three coexisting feedback resources including two fast feedback channels (PFBCH and SFBCH) and a correlation matrix feedback extended header (CMFEH), feedback The allocation index is set to one of 0b01, 0b10, and 0b11. If the assignment interval (d) is set to '0b000', the feedback assignment index is set to one of 0b01, 0b10, and 0b11 to instruct to release a specific feedback resource, or 0b00 to release all previously allocated feedback resources Indicate. If the assignment interval d is not '0b000' and the feedback assignment index indicates a currently existing feedback resource, the currently existing feedback resource and associated parameters are released and a new feedback resource with the parameters indicated by the feedback assignment index .

As an alternative to the feedback assignment index, instead of releasing the current feedback resource with the same feedback assignment index by assigning a new feedback resource, the operation described below is possible. That is, if the allocation period 'd' is not '0b000', the feedback allocation index can not indicate the currently existing feedback resource.

The base station allocates a feedback resource to the UE by assigning a feedback allocation index to the UE, and additionally specifies an index of the fast feedback channel and the content of the feedback resource (i.e., the MIMO feedback mode). Also, the BS can confirm successful reception of the feedback assignment A-MAP IE by allocating an ACK channel for the UE. The release of a particular feedback resource is performed by specifying a feedback allocation index of the previously assigned feedback resource.

6 is a flowchart illustrating a procedure for allocating and releasing a feedback resource using a feedback assignment A-MAP IE according to an embodiment of the present invention.

Referring to FIG. 6, in step 602, the UE receives a feedback assignment A-MAP IE through a designated downlink subframe, for example, a subframe #n of every frame. In step 604, the UE receives the feedback assignment A- It is checked whether the included allocation period parameter d is a specific value indicating the release of the feedback resource, for example, '0b000'. If it is '0b000', the process proceeds to step 606, and if not, the process proceeds to step 614.

In step 606, the UE confirms that the feedback resource having the specific feedback allocation index is released, and updates the related information of the feedback allocation index for the feedback manager stored in the database, that is, the allocation status and the related parameter. This makes the database of the terminal coincide with the information stored in the database of the base station. In step 608, the UE determines whether the ACK allocation flag included in the feedback allocation A-MAP IE is set to a specific value indicating that the ACK channel is allocated, e.g., '0b1'. If it is set to '0b1', the UE proceeds to step 612 and transmits an ACK for release of the feedback resource. Otherwise, it determines that ACK is not transmitted in step 610.

In step 614, the UE confirms that a feedback resource having a specific feedback allocation index is allocated, checks the uplink fast feedback channel index and the MIMO feedback mode for the allocated feedback resource, And updates the related information of the allocation index. In step 616, the UE confirms whether the ACK allocation flag included in the feedback assignment A-MAP IE is set to a specific value indicating that the ACK channel is allocated, e.g., '0b1'. If it is set to '0b1', the process proceeds to step 620, and the UE transmits an ACK for allocation of the feedback resource and transmits feedback via the feedback resource. Otherwise, it determines that ACK is not transmitted in step 618.

Table 3 below shows the format of the feedback polling A-MAP IE according to the preferred embodiment of the present invention. The various fields described below are merely examples, and the present invention is not limited thereto. The feedback polling A-MAP IE may include appropriate fields according to the communication protocol standard to which the present invention applies, the system designer, or the operator's choice. Hereinafter, the information fields related to the preferred embodiment of the present invention will be described in detail.

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. If (d == 0b000) { Feedback de - allocation Dedicated UL allocation One 0 b0 : No dedicated UL resource is de - allocated , but the  feedback content identified by Allocation Index is de - allocated .
0 b1 : A dedicated UL resource is explicitly de - allocated . If  ( Dedicated UL  allocation == 0 b1 ) { 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 HFA 3 HARQ feedback channel allocation for feedback channel de-allocation confirmation } else  { Polling Allocation Index 2 Unique index referring to  a previously assigned feedback  channel. If Polling _ Allocation _ Index  = 0 b00 , then all  feedback previously assigned with  a Feedback Polling  A-MAP IE are de - allocated . } } else if (d! = 0b000) { Feedback allocation 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 (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 } else  { Polling Allocation Index 2 Unique index assigned to this feedback channel allocation . Polling_Allocation_Index shall be different than  0 b00 . } } Period (p) 3 Transmit feedback header every 4 ^p 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 If (Dedicated UL allocation == 0b1) { MEF One MIMO encoder format
0b0: SFBC
0b1: Vertical encoding with Mt = 2 if Nt = 2 or 4, or Mt = 1 if Nt = 1
Non-adaptive precoding shall be used at the MS. Nt is the number of transmit antennas at the AMS. } 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. MaxMt Variable
1 or 2 Variable number of bits - depends on number of transmit antennas Nt

If Nt = 2 (SU-MIMO and MU-MIMO):
0b0: 1
0b1: 2

If Nt = 4 (SU-MIMO and MU-MIMO):
0b00: 1
0b01: 2
0b10: 3
0b11: 4

If Nt = 8 (SU-MIMO):
0b000: 1
0b001: 2
0b011: 4
0b111: 8

If Nt = 8 (MU-MIMO):
0b00: 1
0b01: 2
0b10: 3
0b11: 4
MFM 3 MIMO Feedback Mode for which the AMS shall feedback CQI and CSI to the ABS If (MFM = 2, 3, 5, 6) { Feedback of CQI and CSI for localized resource units Num_best_subbands 3 0b000: report all subbands

0b001 ~ 0b111: Number of best subbands to report
1 < Num_best_subbands = N _sub } If (MFM == 3,4,6,7) { 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) { Measurement Method Indication One 0b0: Use the midamble for CQI measurements
0b1: Use pilots in OL region with MaxMt 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 = 0b10 or 0b11) { CPI One Concatenating PMI Feedback indication;
0b0: feedback CPMI for N_multiBS_reports-1 diversity set members;
0b1: no feedback CPMI 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 } } } } Reserved One Padding variable Padding to reach byte boundary MCRC 16 16 bit CRC masked by Station ID

As shown in Table 3, the feedback polling A-MAP IE explicitly includes a polling allocation index for allocation and release commands in the case where dedicated uplink resources are not indicated.

The polling allocation index is used as a unique identifier related to allocation of feedback resources, and is used when dedicated uplink resources (i.e., resource indexes) are not allocated. Coexisting feedback resources can not have the same polling assignment index. As an example, the UE may transmit up to three distinct messages including a correlation matrix feedback extension header (CMFEH), a MIMO feedback extended header (MFEH), an AAI single BS_MIMO_FBK, and an AAI_multiple BS_MIMO_FBK, When supporting coexisting feedback resources, the polling assignment index is set to one of 0b01, 0b10, 0b11. When the allocation interval d is set to '0b000', the polling allocation index is set to one of 0b01, 0b10, and 0b11 to instruct the release of a specific feedback resource, or 0b00 to release all previously allocated feedback resources Indicate. If the assignment interval d is not '0b000' and the polling assignment index indicates a currently existing feedback resource, the current feedback resource and related parameters are released and a new feedback with parameters indicated by the polling assignment index Resources are allocated.

As an alternative to the polling assignment index, instead of releasing the current feedback resource by allocating a new feedback resource with the same feedback assignment index, the operation described below is possible. That is, if the allocation period 'd' is not '0b000', the polling allocation index can not indicate the currently existing feedback resource.

The base station selectively allocates or releases feedback resources and feedback content using a polling assignment index or release command of a dedicated uplink resource index that uniquely identifies the feedback resource. Therefore, the base station can minimize the feedback interruption times and perform the dynamic switching between the MIMO transmission modes.

7 is a flowchart illustrating a procedure for allocating and releasing a feedback resource using the feedback polling A-MAP IE according to another embodiment of the present invention (shown in FIGS. 7A and 7B for convenience).

Referring to FIG. 7, in step 702, the UE receives a feedback polling A-MAP IE through a designated downlink subframe, for example, a subframe #n of every frame. In step 704, the UE receives the feedback polling A- It is checked whether the included allocation period parameter d is a specific value indicating the release of the feedback resource, for example, '0b000'. If it is '0b000', the process proceeds to step 706;

In step 706, the UE determines whether the dedicated uplink HARQ field included in the feedback polling A-MAP IE is a specific value indicating assignment, for example, '0b1'. If not, in step 708, the UE releases the feedback resource indicated by the polling allocation index included in the feedback polling A-MAP IE and confirms the uplink ACK channel (ACHCH) allocated by the base station. At this time, the UE updates the related information of the corresponding polling allocation index for the feedback manager stored in the database, that is, the allocation status and the related parameter, to match the database of the base station. In step 710, the UE transmits an ACK for release of the feedback resource on the uplink ACK channel. If the dedicated uplink allocation field indicates allocation, in step 712, the UE releases the pre-allocated feedback resource according to the dedicated uplink resource index and identifies the uplink ACK channel allocated by the base station. In step 714, the UE transmits an ACK for release of the feedback resource on the uplink ACK channel.

In step 716, the UE determines whether a dedicated uplink allocation field included in the feedback polling A-MAP IE is a specific value indicating allocation of a dedicated uplink resource, for example, '0b1'. If '0b1', the process proceeds to step 718; otherwise, the process proceeds to step 722. In step 718, the UE confirms that the feedback resource is allocated using a dedicated uplink resource index, the sub-frames of the dedicated uplink subframes, every 4 ^p-th frame is given as an example according to the resource index in step 720 #n Lt; RTI ID = 0.0 &gt; feedback. Where p is a value that can be specified by the feedback polling A-MAP IE.

In step 722, the UE confirms that the feedback resource indicated by the polling allocation index included in the feedback polling A-MAP IE is allocated. At this time, the UE confirms that the polling allocation index for the feedback manager stored in the database is valid, and updates the related information of the polling allocation index, i.e., the allocation status and the related parameters, to match the database of the base station. In another embodiment, the UE can confirm the allocated resources by checking the allocated resources according to the feedback polling A-MAP IE received previously, or further receiving a separate allocation IE. In step 724, UE determines the uplink resource in a subframe #n in every 4 ^p-th frame as the given sub-frame, an example having the appropriate size. To this end, the UE confirms the size of the uplink resource allocated for the data packet from the data channel allocation IE received from the base station. In step 726, the MS determines whether the uplink resource is available or valid. If the resource is valid, the MS proceeds to step 728, otherwise proceeds to step 730.

In step 728, the UE transmits feedback information through the allocated feedback resource. In step 730, the MS transmits a bandwidth (BW) request to the BS in step 732. In step 732, the MS confirms the uplink resource allocated for feedback from the BS in the next frame, And transmits feedback information.

In the release procedure via the feedback polling A-MAP IE, it may be inefficient to send an ACK indicating successful reception of the release of the feedback resource. This is because the ACK channel is allocated only when instructing the release by explicitly indicating the resource index. Therefore, you can not use an ACK when performing a release using a polling allocation index. The feedback resource allocated by the feedback polling A-MAP IE indicates an extension header or a MAC control message, so that the feedback resource can be transmitted from the terminal attached to the uplink data packet. Therefore, it is efficient to transmit an ACK through a MAC control message or an extension header. In particular, this operation is required when the UE desires to continuously hold the allocated extended header or MAC control message. If this type of ACK is allowed, the base station is unable to release existing feedback resources with the same polling assignment index by allocating new feedback resources with a specific polling assignment index.

The above-described operation can be realized by providing the base station and the terminal with a memory device storing the program code. In other words, the base station and the terminal read out and execute the program code stored in the memory device by a processor or a CPU (Central Processing Unit) to execute the above-described operation. Specifically, either or both of the base station and the UE are configured to be able to realize the management of the feedback resource according to either or both of the feedback allocation A-MAP IE and the feedback polling A-MAP IE.

Hereinafter, an embodiment of a configuration of a base station and a terminal for performing the above-described management operation of feedback resources will be described.

8 is a block diagram illustrating a configuration of a base station according to an embodiment of the present invention.

Referring to FIG. 8, when a feedback resource is allocated or released to the UE, the MAP transmitter 802 generates a feedback allocation A-MAP IE containing a corresponding feedback allocation index or a feedback poll A-MAP IE containing a corresponding allocation index To the terminal. The determination of the allocation or release of the feedback resource can be made by a controller or a scheduler, which is not shown, and its detailed operation is not related to the main points of the present invention, and therefore a detailed description thereof will be omitted.

The feedback manager 804 controls the database 806 that stores a list of feedback resources that are currently being maintained for the associated terminal at the base station. When the feedback resource is allocated or released to the terminal, the corresponding allocation status and related parameters are stored in the database 806 by the feedback manager 804.

The feedback receiver 808 receives the corresponding feedback information through at least one feedback resource allocated to the terminal, and forwards the received feedback information to the link adaptation unit 810 as a unit in need thereof. The feedback information may be used to perform AMC operations, link adaptation, dynamic switching of operating modes, and the like.

9 is a block diagram illustrating a configuration of a terminal according to an embodiment of the present invention.

9, the MAP receiver 902 receives a feedback allocation A-MAP IE containing a specific feedback allocation index or a feedback polling A-MAP IE containing a specific allocation index of a polling from the base station and transmits the feedback polling A-MAP IE to the feedback manager 904 . The feedback manager 904 identifies the feedback resource allocated or released by the feedback assignment A-MAP IE or the feedback polling A-MAP IE, and stores the assignment state and related parameters in the database 906. The confirmation of the feedback resource allocated or released by the feedback assignment A-MAP IE or the feedback polling A-MAP IE may be performed by the feedback manager 904 or a controller not shown.

The feedback transmitter 908 transmits the feedback information via at least one feedback resource allocated to the terminal. The feedback information is composed of content and format specified by a base station or according to a predefined rule, and transmitted via an associated feedback resource.

Hereinafter, another format of the feedback assignment / polling A-MAP IE according to another embodiment of the present invention will be described.

Table 4 below shows another format of the feedback assignment A-MAP IE according to the preferred embodiment of the present invention. The various fields described below are merely examples, and the present invention is not limited thereto. The feedback assignment A-MAP IE may include appropriate fields according to the communication protocol standard to which the present invention applies, the system designer, or the operator's choice. Hereinafter, the information fields related to the preferred embodiment of the present invention will be described in detail.

Syntax Size in bits Description / Notes Feedback-Allocation-MAP_IE () { - - A-MAP IE Type 4 Feedback Allocation A-MAP IE = 0b0010 Channel Index 6 Feedback channel index within the UL fast feedback control resource region (Dependent on L _{FB , FPi} ). Short-term Feedback Period ( p ) 3 A feedback is transmitted on the FBCH every 2 ^p frames. Long-term Feedback Period ( q ) 2 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 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 Indicate the UL subframe index in the UL portion of the frame Allocation Duration ( d ) 3 A FBCH is transmitted on the FBCH channels indexed by Channel Index for 8 * 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 One Indicate if one ACK channel is allocated to acknowledge the successful detection of this IE. If (ACK Allocation Flag == 0b1) { HFA 3 HARQ feedback channel allocation for feedback channel de-allocation confirmation } if  (d! = 0 b000 ) { Feedback _ Allocation _ Index 3 Unique index assigned to this feedback allocation . Allowed values  are 0 b001 , 0 b010 and  0 b011 . This newly assigned  Feedback_Allocation_Index shall be different than  a currently  assigned Feedback  _ Allocation _ Index if ACK Allocation Flag  == 0 b0 . } else if  (d = 0 b000 ) { Feedback _ Allocation _ Index 3 Unique index referring to feedback allocations previously  assigned with  a Feedback Allocation  A- MAP IE .

0 b000 : all feedback previously assigned is de - allocated
0b001: feedback assigned with index  0 b001 is de - allocated
0b010: feedback assigned with index  0 b010 is de - allocated
0b011: feedback assigned with index  0 b011 is de - allocated
0b100: feedback assigned with indexes  0 b001 and  0 b010 is de - allocated
0b101: feedback assigned with indexes  0 b001 and  0 b011 is de - allocated
0b110: feedback assigned with indexes  0 b010 and  0 b011 is de - allocated
0b111: reserved } MFM 3 MIMO Feedback Mode MaxMt Variable
1-2
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 } If (MFM = 0, 1, 4, 7) { FPI 2 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 == 0,1AND q! = 0b00) { Long term FPI 2 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 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 One 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 One 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 feedback assignment index is a unique identifier related to feedback assignment / release, and concurrently allocated feedback resources can not have the same identifier. The UE can simultaneously support up to three distinct concurrent feedback channels by means of a feedback assignment index. The feedback allocation index is used differently according to the allocation interval parameter d.

If the allocation interval parameter d is not a specific value indicating the release of the feedback resource, for example, '0b000', the feedback allocation index is a unique identifier related to the allocation of the feedback resource and is one of 0b001, 0b010 and 0b011 Value. If the ACK allocation flag included in the feedback allocation A-MAP IE is a specific value, for example, '0b0', indicating that the ACK channel is allocated, the newly allocated feedback allocation index must be different from the currently allocated feedback allocation index . That is, the feedback allocation index can not be set to the index of the currently allocated feedback resource.

If the allocation interval parameter is '0b000', the feedback allocation index is a unique identifier related to the feedback resource pre-allocated by the feedback allocation A-MAP IE and has a value of 0b000 to 0b111, It means that the allocated feedback resource is released. However, 0b000 means that all pre-allocated feedback resources are released. In this case, the feedback assignment index is used for releasing one or more pre-assigned specific feedback resources.

The ACK allocation flag is a channel index of the FBCH from which the channel index (i.e., the feedback allocation index) of the newly allocated FBCH is released when the allocation interval d is '0b000' or the allocation interval d is not 0b000 Feedback allocation index), it is set to '0b1'.

FIG. 10 is a flowchart illustrating a procedure for allocating and releasing a feedback resource using a feedback assignment A-MAP IE according to another embodiment of the present invention.

Referring to FIG. 10, in step 1002, the UE receives a feedback assignment A-MAP IE through a designated downlink subframe, for example, a subframe #n of every frame, and in step 1004, It is checked whether the included allocation interval parameter d is a specific value indicating the release of the feedback resource, for example, 'b000'. If it is '0b000', the process proceeds to step 1006, and if not, the process proceeds to step 1014.

In step 1006, the UE confirms that the feedback resource having the specific feedback allocation index is released, and updates related information of the corresponding feedback allocation index for the feedback manager stored in the feedback management database, that is, the allocation status and the related parameter. This makes the database of the terminal coincide with the information stored in the database of the base station. In step 1008, the UE determines whether the ACK allocation flag included in the feedback allocation A-MAP IE is set to a specific value indicating that the ACK channel is allocated, e.g., '0b1'. If it is set to '0b1', the UE proceeds to step 1012 and transmits an ACK for release of the feedback resource. Otherwise, it decides not to transmit ACK in step 1010.

In step 1014, the UE confirms that a feedback resource having a specific feedback allocation index is allocated, and confirms feedback parameters such as an uplink fast feedback channel index and an MIMO feedback mode for the allocated feedback resource. In step 1016, the UE confirms whether the ACK allocation flag included in the feedback assignment A-MAP IE is set to a specific value indicating that the ACK channel is allocated, e.g., '0b1'. If it is set to '0b1', the process proceeds to step 1028, where the UE transmits an ACK for allocation of the feedback resource and transmits feedback through the feedback resource, and if not, proceeds to step 1018.

In step 1018, the UE confirms whether the feedback allocation index included in the feedback assignment A-MAP IE is currently allocated in the database. If the feedback allocation index exists in the database, the UE removes the previous feedback resource having the feedback allocation index in step 1020, and records the feedback parameters and the feedback allocation index identified in step 1014 in the database in the database (not shown). Then, in step 1022, feedback is transmitted via the feedback resource.

If the feedback allocation index does not exist in the database, the UE writes the confirmed feedback parameters and the feedback allocation index to the database in step 1024, and transmits feedback through the feedback resource in step 1026.

Table 5 below shows another format of the feedback polling A-MAP IE according to the preferred embodiment of the present invention. The various fields described below are merely examples, and the present invention is not limited thereto. The feedback polling A-MAP IE may include appropriate fields according to the communication protocol standard to which the present invention applies, the system designer, or the operator's choice. Hereinafter, the information fields related to the preferred embodiment of the present invention will be described in detail.

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. If (d == 0b000) { Feedback de-allocation Dedicated UL allocation One 0b0: No dedicated UL resource is de-allocated, but the feedback content identified by Allocation Index is de-allocated.
0b1: A dedicated UL resource is explicitly de-allocated. If (Dedicated UL allocation == 0b1) { 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 HFA 3 HARQ feedback channel allocation for feedback channel de-allocation confirmation } else { Polling Allocation Index 3 Unique index referring to feedback allocations  previously assigned with  a Feedback Polling  A- MAP IE .

0 b000 : all feedback previously assigned is de - allocated , including all allocations with dedicated uplink resources
0 b001 : feedback assigned with index  0 b001 is de - allocated
0 b010 : feedback assigned with index  0 b010 is de - allocated
0 b011 : feedback assigned with index  0 b011 is de - allocated
0 b100 : feedback assigned with indexes  0 b001 and  0 b010  is de - allocated
0 b101 : feedback assigned with indexes  0 b001 and  0 b011  is de - allocated
0 b110 : feedback assigned with indexes  0 b010 and  0 b011  is de - allocated
0 b111 : feedback assigned with indexes  0 b001 , 0b010, 0 b011 is de - allocated } HFA 3 HARQ feedback channel allocation for feedback channel de-allocation confirmation } else if (d! = 0b000) { Feedback allocation 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 ACK Allocation Flag One Indicate if one ACK channel is allocated to acknowledge the successful detection of this IE. If (ACK Allocation Flag == 0b1) { HFA 3 HARQ feedback channel allocation } If (Dedicated UL allocation == 0b1) { ISizeOffset 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 } else { Polling Allocation Index 3 Unique index assigned to this feedback  allocation. Allowed values are  0 b001 , 0 b010  and 0 b011 . This newly assigned  Polling_Allocation_Index shall be different  than a currently assigned Polling _ Allocation _ Index if ACK  Allocation Flag  == 0 b0 . } Period (p) 3 Transmit feedback header every 4p 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 If (Dedicated UL allocation == 0b1) { MEF One MIMO encoder format
0b0: SFBC
0b1: Vertical encoding with Mt = 2 if Nt = 2 or 4, or Mt = 1 if Nt = 1
Non-adaptive precoding shall be used at the MS. Nt is the number of transmit antennas at the AMS. } 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. MaxMt Variable
1 or 2 Variable number of bits - depends on number of transmit antennas Nt

If Nt = 2 (SU-MIMO and MU-MIMO):
0b0: 1
0b1: 2

If Nt = 4 (SU-MIMO and MU-MIMO):
0b00: 1
0b01: 2
0b10: 3
0b11: 4

If Nt = 8 (SU-MIMO):
0b000: 1
0b001: 2
0b011: 4
0b111: 8

If Nt = 8 (MU-MIMO):
0b00: 1
0b01: 2
0b10: 3
0b11: 4 MFM 3 MIMO Feedback Mode for which the AMS shall feedback. CQI and CSI to the ABS If (MFM = 2, 3, 5, 6) { Feedback of CQI and CSI for localized resource units Num_best_subbands 3 0b000: report all subbands
0b001 ~ 0b111: Number of best subbands to report
1 < Num_best_subbands = Nsub } If (MFM == 3,4,6,7) { 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) { Measurement Method Indication One 0b0: Use the midamble for CQI measurements
0b1: Use pilots in OL region with MaxMt 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 } } } } Reserved One Padding variable Padding to reach byte boundary MCRC 16 16 bit CRC masked by Station ID

As shown in Table 5, when the feedback polling A-MAP IE does not explicitly indicate the dedicated allocated link resource, i.e., when the dedicated uplink allocation field is not '0b1' And a polling allocation index which is a unique index.

The polling assignment index is a unique identifier related to feedback assignment / release, and concurrently allocated feedback resources can not have the same identifier. The UE can simultaneously support up to three distinct concurrent feedback channels with no dedicated uplink resources by means of the polling assignment index. The three feedback channels may have polling assignment indices 0b01, 0b10, and 0b11, respectively. The feedback allocation index is used differently according to the allocation interval parameter d.

The polling assignment index is a unique identifier related to the feedback resource pre-assigned by the feedback polling A-MAP IE, when the assignment interval parameter is a specific value '0b000' indicating the release of the feedback resource, and is one of 0b000 to 0b111 Value. Of these, 0b001, 0b010, and 0b011 mean that the pre-allocated feedback resource having the corresponding index is released. 0b000 means that all pre-allocated feedback resources including dedicated uplink resources are released. 0b100 means that the feedback resources of 0b001 and 0b010 are released, 0b101 means that the feedback resources of 0b001 and 0b011 are released, and 0b110 means that the feedback resources of 0b010 and 0b011 are released. In this case, the polling assignment index is used for releasing all feedback resources including one or more pre-assigned specific feedback resources or dedicated uplink resources.

If the allocation interval parameter d is not a specific value indicating the release of the feedback resource, for example, '0b000', the polling allocation index is a unique identifier associated with allocation of the feedback resource and is one of 0b001, 0b010 and 0b011 Value. If the ACK allocation flag included in the feedback polling A-MAP IE does not indicate that an ACK channel is allocated, for example 0b0, the polling allocation index must be different from the currently assigned polling allocation index. That is, the polling assignment index can not be set to the index of the currently allocated feedback resource.

The ACK allocation flag is a channel index of the FBCH from which the channel index (i.e., the polling allocation index) of the newly allocated FBCH is released when the allocation period d is '0b000' or the allocation period d is not '0b000' Polling allocation index), it is set to '0b1'.

11 is a flow chart illustrating a procedure for allocating and releasing a feedback resource using the feedback polling A-MAP IE according to another embodiment of the present invention (shown in FIGS. 11A and 11B for convenience).

Referring to FIG. 11, in step 1102, the UE receives a feedback polling A-MAP IE through a designated downlink subframe, for example, a subframe #n of every frame. In step 1104, the UE receives the feedback polling A- It is checked whether the included allocation period parameter d is a specific value indicating the release of the feedback resource, for example, '0b000'. If it is '0b000', the process proceeds to step 1106;

In step 1106, the UE determines whether a dedicated uplink allocation field included in the feedback polling A-MAP IE is a specific value indicating assignment, for example, '0b1'. If not, in step 1108, the UE releases the feedback resource indicated by the polling allocation index included in the feedback polling A-MAP IE and confirms the uplink ACCH (ACHCH) allocated by the base station. At this time, the UE updates the related information of the corresponding polling allocation index for the feedback manager stored in the database, that is, the allocation status and the related parameter, to match the database of the base station. In step 1110, the UE transmits an ACK for release of the feedback resource on the uplink ACK channel. If the dedicated uplink allocation field indicates allocation, in step 1112, the UE releases the pre-allocated feedback resource according to the dedicated uplink resource index and identifies the uplink ACK allocated by the base station. In step 1114, the UE transmits an ACK for release of the feedback resource on the uplink ACK channel.

In step 1116, the UE determines whether a dedicated uplink allocation field included in the feedback polling A-MAP IE is a specific value indicating allocation of a dedicated uplink resource, for example, 0b1. If it is 0b1, the process proceeds to step 1118, otherwise, the process proceeds to step 1126. [ In step 1118, the UE confirms that the feedback resource is allocated using the dedicated uplink resource index, and proceeds to step 1120. In step 1120, the UE determines whether the ACK allocation flag included in the feedback polling A-MAP IE is set to '0b1' as a specific value indicating that the ACK channel is allocated, for example. If the set to the '0b1', the process proceeds to step 1124 the terminal transmits ACK for the allocation of the dedicated uplink resources, the specified sub-frame, the periodic feedback in a subframe #n in every 4 ^p-th frame as an example send. Where p is a value that can be specified by the feedback polling A-MAP IE. Otherwise, in step 1122, the UE transmits periodic feedback in the designated subframe.

In step 1126, the UE confirms that the feedback resource indicated by the polling assignment index included in the feedback polling A-MAP IE is allocated, and proceeds to step 1128. [ At this time, the UE confirms that the polling allocation index for the feedback manager stored in the database is valid. In another embodiment, the UE can confirm the allocated resources by checking the allocated resources according to the feedback polling A-MAP IE received previously, or further receiving a separate allocation IE.

In step 1128, the UE checks whether the ACK allocation flag included in the feedback polling A-MAP IE is set to a specific value indicating that the ACK channel is allocated, e.g., '0b1'. If it is set to '0b1', the process proceeds to step 1138, otherwise proceeds to step 1130.

In step 1130, the UE determines whether the polling allocation index included in the feedback polling A-MAP IE is currently allocated in the database. If the polling assignment index is not currently allocated, the UE records the feedback parameters and the polling assignment index allocated by the feedback polling A-MAP IE in the database in step 1136, and proceeds to step 1134. If the polling assignment index exists in the database, the UE removes the previous feedback resource having the polling assignment index in step 1132, and updates the feedback parameters allocated by the feedback polling A-MAP IE and the polling assignment index And proceeds to step 113. [ In step 1134, the UE transmits an ACK for allocation of the feedback resource, and proceeds to step 1138.

In step 1138, the UE confirms that the uplink resources have an appropriate size in the designated subframe, for example, in the subframe #n of every 4 ^pth frame. To this end, the UE confirms the size of the uplink resource allocated for the data packet from the data channel allocation IE received from the base station. In step 1140, the UE determines whether the uplink resource is available or valid. If the resource is valid, the UE proceeds to step 1146. If the uplink resource is not available, the UE proceeds to step 1142. [

In step 1146, the UE transmits feedback information through the allocated feedback resource. In step 1142, the MS transmits a bandwidth (BW) request to the BS for feedback, checks the uplink resource allocated for feedback from the BS in the next frame in step 1144, and then uses the allocated resources And transmits feedback information.

12 is a flowchart illustrating an operation of a base station that performs allocation and release of feedback resources according to a preferred embodiment of the present invention.

Referring to FIG. 12, in step 1202, the BS determines to allocate or release a feedback resource for the UE, and proceeds to step 1204. In step 1204, the process proceeds to one of steps 1206, 1216, and 1224 depending on whether the feedback resource for the UE is allocated, released, or joint de-allocation and new allocation.

In step 1206, the BS acquires an index of feedback resources to be released from the feedback management database in order to release the feedback resource, and confirms the type of the obtained index in step 1208. If the type of the index is the polling allocation index, the BS proceeds to step 1210 and sets the allocation interval parameter and the polling allocation index set to '0b000' in the feedback polling A-MAP IE and transmits the parameter to the UE. In the case of the dedicated uplink resource index, the BS proceeds to step 1212, and the BS sets an allocated interval parameter set to '0b000' in the feedback polling A-MAP IE and the dedicated uplink resource index, and transmits it to the UE. In the case of the feedback allocation index, the BS proceeds to step 1214 and sets the allocation interval parameter and the feedback allocation index set to '0b000' in the feedback allocation A-MAP IE and transmits the allocation allocation parameter to the UE.

In step 1216, the base station acquires an index of the feedback resource to be reallocated for the new feedback report from the feedback management database to concurrently release the existing feedback resource and allocate the new feedback resource having the same index do. In step 1218, the base station selects the allocation type of the feedback resource according to a predetermined rule, a communication protocol standard, or a designer's intention. In step 1220, the BS transmits a feedback polling A-MAP IE including the polling assignment index set in the index obtained in step 1216 to the UE in order to reallocate the index of the new feedback resource do. At this time, the ACK allocation flag may be set to '0b1'. On the other hand, if it is determined to use the feedback allocation index, in step 1222, the base station transmits a feedback allocation A-MAP IE including the feedback allocation index set in the index obtained in step 1216 to the terminal send. At this time, similarly, the ACK allocation flag can be set to '0b1'.

In step 1224, the BS checks a valid allocation index from the feedback management database to allocate a new feedback resource. In step 1226, the base station selects the allocation type of the feedback resource according to a predetermined rule, a communication protocol standard, or a designer's intention. In step 1228, the base station transmits a feedback allocation report including the polling allocation index set to the confirmed index to the feedback polling A-MAP IE in order to request a feedback report without allocating dedicated uplink resources. send. If it is selected to use the feedback allocation index, in step 1230, the base station transmits the feedback allocation A-MAP IE including the feedback allocation index set to the confirmed index to the UE.

If the polling assignment index and the feedback assignment index are not all selected in step 1226, the BS selects one of the operations A, B, and C according to predetermined rules, a communication protocol standard, or a designer's intention in step 1232 do. When the operation A is selected, the base station determines that simultaneous execution of release of existing feedback resources and allocation of a new feedback resource having the same index is performed, and the process proceeds to step 1216. If the operation B is selected, in step 1234, the base station generates a feedback polling A-MAP IE including a dedicated uplink allocation field set to the identified index, and transmits the generated feedback polling A-MAP IE to the UE. If operation C is selected, then in step 1236 the base station determines not to allocate feedback resources.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. 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.

1 is a block diagram illustrating a schematic configuration of a wireless cellular system according to a preferred embodiment of the present invention;

2 is a message flow diagram illustrating a feedback operation according to a preferred embodiment of the present invention.

3 is a flow diagram illustrating allocation of feedback resources according to a preferred embodiment of the present invention.

4 is a flowchart illustrating a procedure for allocating and releasing a feedback resource using a feedback assignment A-MAP IE according to an embodiment of the present invention.

5A and 5B are flowcharts illustrating a procedure for allocating and releasing a feedback resource using a feedback polling A-MAP IE according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating a procedure for allocating and releasing a feedback resource using a feedback assignment A-MAP IE according to another embodiment of the present invention. FIG.

7A and 7B are flowcharts showing a procedure of allocating and releasing a feedback resource using a feedback polling A-MAP IE according to another embodiment of the present invention;

8 is a block diagram illustrating a configuration of a base station according to an embodiment of the present invention;

9 is a block diagram illustrating a configuration of a terminal according to an embodiment of the present invention;

10 is a flowchart illustrating a procedure for allocating and releasing a feedback resource using a feedback assignment A-MAP IE according to another embodiment of the present invention.

11A and 11B are flowcharts showing a procedure for allocating and releasing a feedback resource using a feedback polling A-MAP IE according to another embodiment of the present invention.

FIG. 12 is a flowchart illustrating an operation of a base station that performs allocation and release of feedback resources according to a preferred embodiment of the present invention. FIG.

Claims (28)

A method for feedback management by a base station in a wireless cellular system, Determining a feedback resource index that uniquely identifies a feedback resource to be allocated or released among a plurality of feedback resources that can be simultaneously allocated to a terminal; And transmitting a feedback resource map (A-MAP) information element (IE) including the feedback resource index to the UE, Wherein the feedback resource index comprises: A first value indicating that all the feedback resources allocated to the UE are released, a second value indicating an index of a feedback resource to be allocated among the plurality of feedback resources, a first value indicating one or more And a third value indicating an index of feedback resources to be released among the feedback resources. 2. The method of claim 1, wherein the feedback resource map IE comprises an assignment interval parameter indicating a time when the feedback resource is used, Wherein the feedback resource index is set to a value indicating that all previously allocated feedback resources are released when the assignment interval parameter indicates a specific value indicating the release of the feedback resource and the assignment interval parameter indicates the specific value And indicates an index of a specific feedback resource to be allocated or released. 2. The method of claim 1, wherein the feedback resource map IE includes a feedback assignment A-MAP IE, and the feedback resource index includes a feedback assignment index uniquely identifying a feedback channel to be allocated or released. How to manage. 4. The method of claim 3, If the assignment interval parameter included in the feedback assignment A-MAP IE indicates a specific value indicating the release of the feedback resource, a value indicating that all previously allocated feedback resources are released and one or more pre- Has a value indicating that the particular feedback resource that has been released is released, And if the assignment interval parameter does not indicate the specific value, the unique index of the feedback resource to be allocated is set. The method of claim 1, wherein the feedback resource map IE includes a feedback polling A-MAP IE, and the feedback resource index includes a polling assignment index uniquely identifying a feedback channel to be allocated or released. How to manage. 6. The method of claim 5, The allocation interval parameter included in the feedback polling A-MAP IE indicates a first value indicating release of the feedback resource, and the dedicated uplink allocation field included in the feedback polling A-MAP IE indicates that the dedicated uplink resource is released Indicating that one or more pre-allocated specific feedback resources having a unique index and a value indicating that all pre-allocated feedback resources including dedicated uplink resources are to be released are to be released Lt; / RTI &gt; value, If the allocation interval parameter does not indicate the first value and the ACK allocation flag included in the feedback polling A-MAP IE does not indicate a third value indicating that the ACK channel is allocated, Index is set to an index. 2. The method of claim 1, further comprising: managing a database that stores a list of at least one current feedback resource that is currently maintained for each associated terminal, Wherein the database stores the type, allocation status and associated assignment parameters of the associated feedback resource map IEs for each of the at least one current feedback resource. A method for feedback management by a terminal in a wireless cellular system, Receiving a feedback resource map (A-MAP) information element (IE) from a base station; Extracting a feedback resource index that uniquely identifies a feedback resource to be allocated or released from a plurality of feedback resources that can be allocated to the terminal simultaneously from the feedback resource map IE, Wherein the feedback resource index comprises: A first value indicating that all the feedback resources allocated to the UE are released, a second value indicating an index of a feedback resource to be allocated among the plurality of feedback resources, a first value indicating one or more And a third value indicating an index of feedback resources to be released among the feedback resources. 9. The method of claim 8, wherein the feedback resource map IE comprises an assignment interval parameter indicating a time when the feedback resource is used, Wherein the feedback resource index is set to a value indicating that all previously allocated feedback resources are released when the assignment interval parameter indicates a specific value indicating the release of the feedback resource and the assignment interval parameter indicates the specific value And indicates an index of a specific feedback resource to be allocated or released. 9. The method of claim 8, wherein the feedback resource map IE includes a feedback assignment A-MAP IE, and the feedback resource index includes a feedback assignment index uniquely identifying a feedback channel to be allocated or released. How to manage. 11. The method of claim 10, If the assignment interval parameter included in the feedback assignment A-MAP IE indicates a specific value indicating the release of the feedback resource, a value indicating that all previously allocated feedback resources are released and one or more pre- Has a value indicating that the particular feedback resource that has been released is released, And if the assignment interval parameter does not indicate the specific value, the unique index of the feedback resource to be allocated is set. 9. The method of claim 8, wherein the feedback resource map IE comprises a feedback polling A-MAP IE, and the feedback resource index includes a polling assignment index uniquely identifying a feedback channel to be allocated or released. How to manage. 13. The method of claim 12, The allocation interval parameter included in the feedback polling A-MAP IE indicates a first value indicating release of the feedback resource, and the dedicated uplink allocation field included in the feedback polling A-MAP IE indicates that the dedicated uplink resource is released Indicating that one or more pre-allocated specific feedback resources having a unique index and a value indicating that all pre-allocated feedback resources including the dedicated uplink resources are released are instructed to be released , &Lt; / RTI &gt; If the allocation interval parameter does not indicate the first value and the ACK allocation flag included in the feedback polling A-MAP IE does not indicate a third value indicating that the ACK channel is allocated, Index is set to an index. 9. The method of claim 8, further comprising managing a database that stores a list of at least one current feedback resource that is currently being maintained, Wherein the database stores the type, allocation status and associated assignment parameters of the associated feedback resource map IEs for each of the at least one current feedback resource. A base station apparatus for feedback management in a wireless cellular system, A controller for determining a feedback resource index that uniquely identifies a feedback resource to be allocated or released among a plurality of feedback resources simultaneously assignable to the terminal; And a transmitter for transmitting a feedback resource map (A-MAP) information element (IE) including the feedback resource index to a terminal, Wherein the feedback resource index comprises: A first value indicating that all the feedback resources allocated to the UE are released, a second value indicating an index of a feedback resource to be allocated among the plurality of feedback resources, a first value indicating one or more And a third value indicating an index of feedback resources to be released among the feedback resources. 16. The method of claim 15, wherein the feedback resource map IE comprises an assignment interval parameter indicating a time when the feedback resource is used, Wherein the feedback resource index is set to a value indicating that all previously allocated feedback resources are released when the assignment interval parameter indicates a specific value indicating the release of the feedback resource and the assignment interval parameter indicates the specific value And indicates an index of a specific feedback resource to be allocated or released. 16. The method of claim 15, wherein the feedback resource map IE includes a feedback assignment A-MAP IE, and the feedback resource index includes a feedback assignment index uniquely identifying a feedback channel to be allocated or released. Device. 18. The method of claim 17, If the assignment interval parameter included in the feedback assignment A-MAP IE indicates a specific value indicating the release of the feedback resource, a value indicating that all previously allocated feedback resources are released and one or more pre- Has a value indicating that the particular feedback resource that has been released is released, And if the assignment interval parameter does not indicate the specific value, the unique index of the feedback resource to be allocated is set. 16. The method of claim 15, wherein the feedback resource map IE comprises a feedback polling A-MAP IE, and the feedback resource index includes a polling assignment index uniquely identifying a feedback channel to be allocated or released. Device. 20. The method of claim 19, The allocation interval parameter included in the feedback polling A-MAP IE indicates a first value indicating release of the feedback resource, and the dedicated uplink allocation field included in the feedback polling A-MAP IE indicates that the dedicated uplink resource is released Indicating that one or more pre-allocated specific feedback resources having a unique index and a value indicating that all pre-allocated feedback resources including dedicated uplink resources are to be released are to be released Lt; / RTI &gt; value, If the allocation interval parameter does not indicate the first value and the ACK allocation flag included in the feedback polling A-MAP IE does not indicate a third value indicating that the ACK channel is allocated, Index of the base station apparatus. 16. The apparatus of claim 15, further comprising a database storing a list of at least one current feedback resource that is currently maintained for each associated terminal, Wherein the database stores the type, allocation status and associated assignment parameters of the feedback resource map IEs associated with each of the at least one current feedback resource. A terminal apparatus for feedback management in a wireless cellular system, A receiver for receiving a feedback resource map (A-MAP) information element (IE) from a base station; From the feedback resource map IE, a feedback resource index that uniquely identifies a feedback resource to be allocated or released among a plurality of feedback resources simultaneously assignable to the terminal, Wherein the feedback resource index comprises: A first value indicating that all the feedback resources allocated to the UE are released, a second value indicating an index of a feedback resource to be allocated among the plurality of feedback resources, a first value indicating one or more And a third value indicating an index of a feedback resource to be released among the feedback resources. 23. The method of claim 22, wherein the feedback resource map IE comprises an assignment interval parameter indicating a time when the feedback resource is used, Wherein the feedback resource index is set to a value indicating that all previously allocated feedback resources are released when the assignment interval parameter indicates a specific value indicating the release of the feedback resource and the assignment interval parameter indicates the specific value And indicates an index of a specific feedback resource to be allocated or released. 23. The apparatus of claim 22, wherein the feedback resource map IE includes a feedback assignment A-MAP IE, and the feedback resource index includes a feedback assignment index uniquely identifying a feedback channel to be allocated or released. Device. 25. The method of claim 24, If the assignment interval parameter included in the feedback assignment A-MAP IE indicates a specific value indicating the release of the feedback resource, a value indicating that all previously allocated feedback resources are released and one or more pre- Has a value indicating that the particular feedback resource that has been released is released, And if the assignment interval parameter does not indicate the specific value, the unique index of the feedback resource to be allocated is set. The method of claim 22, wherein the feedback resource map IE includes a feedback poll A-MAP IE, and the feedback resource index includes a polling assignment index uniquely identifying a feedback channel to be allocated or released. Device. 27. The method of claim 26, The allocation interval parameter included in the feedback polling A-MAP IE indicates a first value indicating release of the feedback resource, and the dedicated uplink allocation field included in the feedback polling A-MAP IE indicates that the dedicated uplink resource is released Indicating that one or more pre-allocated specific feedback resources having a unique index and a value indicating that all pre-allocated feedback resources including dedicated uplink resources are to be released are to be released Lt; / RTI &gt; value, If the allocation interval parameter does not indicate the first value and the ACK allocation flag included in the feedback polling A-MAP IE does not indicate a third value indicating that the ACK channel is allocated, Index is set to an index. 23. The apparatus of claim 22, further comprising a database that stores a list of at least one current feedback resource that is currently being maintained, Wherein the database stores the type, allocation status and associated assignment parameters of the feedback resource map IEs associated with each of the at least one current feedback resource.

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