WO2010135860A1

WO2010135860A1 - Method and apparatus for allocating the multi-carrier ack channel

Info

Publication number: WO2010135860A1
Application number: PCT/CN2009/071968
Authority: WO
Inventors: 陈小波
Original assignee: 华为技术有限公司
Priority date: 2009-05-25
Filing date: 2009-05-25
Publication date: 2010-12-02
Also published as: CN102077669B; CN102077669A

Abstract

A method and apparatus for allocating the multi-carrier ACK channel are provided in the present invention. The said method comprises: the base station assigns the sequence numbers to at least one DL CC and/or downlink subframe, divides the uplink ACK channel corresponding to the downlink subframe of the DL CC into subblocks, and assigns the subblock labels, and allocates the uplink ACK channel to at least one DL CC first in the ascending order of the said sequence numbers and then in the ascending order of the said labels. The present invention can better support dynamic scheduling PUSCH transmission on the idle resource block, and meanwhile can effectively reduce the signaling from the base station.

Description

Method and device for multi-carrier ACK channel allocation

Embodiments of the present invention relate to communication technologies, and in particular, to a method and an apparatus for multi-carrier ACK channel allocation. Background of the invention

In the LTE-A (Long Term Evolution - Advanced) advanced system evolved by the LTE (Long Term Evolution) system, Carrier Aggregation technology is selected to support wider bandwidth. , meeting the peak data rate requirements of the International Telecommunication Union for fourth-generation communication technologies. In an LTE system, only one or a pair of Component Carriers are used. In LTE-A with carrier aggregation, multiple component carriers can be used simultaneously to obtain a wider transmission bandwidth. Each component carrier in the LTE-A system may be configured to be compatible with the LTE system, and the spectrum of each component carrier may be an adjacent contiguous spectrum, or may be a non-adjacent spectrum in the same frequency band or even in a different frequency band. Discontinuous spectrum. In an LTE-A system, an LTE User Equipment (LTE User Equipment) can only access one or a pair of component carriers for data transmission and reception, and the LTE-A UE can simultaneously access multiple members according to its capabilities and service requirements. The carrier performs data transmission and reception. Carrier aggregation technology is sometimes called Spectrum Aggregation or Bandwidth Extension.

In the LTE-A system, each member carrier has a separate HARQ (Hybrid Automatic Repeat Request) process, and the LTE-A UE can be configured with different UL CCs (UpLink Component Carriers). Carrier) and the number of DL CCs (downlink component carriers). When the LTE-A UE simultaneously accesses at least one DL CC and at least one UL CC to transmit and receive data, at least one PDCCH (Physical Downlink Control) that may be sent by one UL CC to at least one DL CC may be required. CHannel, physical layer downlink control channel) respectively allocates an uplink ACK channel (uplink response channel). In the prior art, the LTE-A base station allocates an ACK channel to at least one DL CC by setting different uplink ACK channel mapping start offsets for each DL CC, which causes discontinuity of uplink ACK channel allocation, so each The DL CCs are discontinuous by the resource blocks corresponding to the idle uplink ACK channel, and it is difficult to utilize these discontinuous resource blocks. Moreover, the prior art requires the base station to send signaling for each initial offset, which increases the number of signaling that the base station sends. Summary of the invention

Embodiments of the present invention provide a method, device, and system for multi-carrier ACK channel allocation. An embodiment of the present invention provides a method for allocating a multi-carrier ACK channel, including: allocating a sequence number to at least one DL CC and/or a downlink subframe;

Sub-blocks are allocated for the uplink ACK channel corresponding to the downlink subframe of the DL CC, and the sub-block labels are allocated; the uplink ACK channel is allocated to the at least one DL CC according to the sequence of incrementing the above-mentioned sequence numbers and incrementing the sub-block labels.

An embodiment of the present invention provides a base station, including:

a first sequence number allocation module, configured to allocate a sequence number to at least one DL CC and/or a downlink subframe; a first label allocation module, configured to divide a sub-block for an uplink ACK channel corresponding to each downlink subframe, and allocate a sub-block label ;

And a first channel allocation module, configured to allocate an uplink ACK channel to the at least one DL CC according to the sequence of incrementing the foregoing sequence number and then incrementing the foregoing sub-block number.

An embodiment of the present invention provides a UE, including:

And a second channel allocation module, configured to allocate an uplink ACK channel to the at least one DL CC according to the order of increasing the sequence number and then incrementing the sub-block number.

An embodiment of the present invention provides a system for multi-carrier ACK channel allocation, including: The base station is configured to allocate a sub-block for the uplink ACK channel corresponding to each downlink subframe, and allocate a sub-block label; and configured to allocate an uplink ACK to the at least one DL CC according to the sequence of incrementing the sequence number and then incrementing the sub-block label. Channel; configured to allocate an uplink ACK channel for at least one DL CC according to an order of increasing the foregoing sequence number and then incrementing the foregoing label.

When a method, a device, and a system for allocating a multi-carrier ACK channel according to an embodiment of the present invention allocate an uplink ACK channel corresponding to an actual associated subframe of a different DL CC, the sequence number of the sub-block can be incremented and the paired DL CC Corresponding idle uplink ACK channel blocks caused by fewer actual associated subframes and smaller n _CFI values are organized into continuous distribution, thus being able to better support dynamics on resource blocks corresponding to these idle uplink ACK channel blocks. The physical layer uplink shared channel is scheduled. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of an ACK channel allocation result in a LTE-A TDD (LTE-A Time Division Duplex) system;

2 is a schematic diagram of an embodiment of allocating an uplink ACK channel according to the present invention;

FIG. 3 is a schematic diagram of an uplink ACK channel distribution allocated by a PDCCH;

4 is a schematic diagram of an uplink ACK channel distribution allocated by a PDCCH;

FIG. 5 is a schematic diagram of an ACK channel allocation result according to an embodiment of the present invention; FIG.

6 is a schematic diagram of an embodiment of an uplink ACK channel reserved for at least one DL CC according to the present invention; FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a UE according to an embodiment of the present invention. Mode for carrying out the invention

The embodiment of the present invention provides a method and a device for allocating an ACK channel under carrier aggregation, and further describes the technical solution of the embodiment of the present invention in further detail.

In the process of implementing the embodiments of the present invention, the inventor finds a base station in the prior art of LTE-A. The method of allocating an uplink ACK channel for at least one DL CC is to set a different ACK channel mapping start offset for each DL CC, and the base station is required to signal each start offset. In this allocation method, the idle uplink ACK channel block caused by the less actual number of associated subframes and the smaller "^ value corresponding to the DL CC is discontinuously distributed, so it is difficult to dynamically schedule these idle resources. Up to the data transmission; and because the initial offset is to be sent separately for each DL CC, the number of signaling sent by the base station is increased.

For example, if the uplink ACK channel mapping start offset of the ith DL CC setting is N _CCHJ , then

The CCE (Control Channel Element) of the i-th DL CC is shown as the number of uplink ACK channels reserved for the uplink ACK channel label mapping. A method similar to n _CCE to _CCH mapping in the LTE system is adopted in each component carrier.

The " _{CC £} to" mapping method in the LTE TDD is: According to the uplink and downlink subframe ratio and the HARQ timing relationship, the downlink associated subframe set index is defined for each uplink subframe: ,...,^^ , as shown in Table 1 below. The problem is that the uplink ACK channel is allocated to the PDCCHs that are sent in at least one downlink subframe in one uplink subframe. In the downlink associated subframe set index: ,... ,

In the }, the number of elements in the set M indicates that the uplink ACK channel is allocated to the PDCCHs that are sent by the M subframes in the uplink subframe; the order of the elements, that is, the subscript w of t _m (0 ≤ w ≤ M - 1) The sub-frame mapping order of the M downlink sub-frames when the uplink ACK channel is allocated; the value k _{m of the} element indicates that the corresponding downlink sub-frame or special sub-frame is the corresponding number of sub-frames starting from the uplink sub-frame The corresponding subframe is followed by a downlink subframe set that feeds back ACK/NACK (ACKnowledgement/Negative-ACKnowledgement acknowledgement/deny response) in the uplink subframe. The above downlink subframe ratio 3 and subframe 2 are taken as an example, and ACK/NACK of M = 3 subframes is fed back in the uplink subframe, and the values "7, 6, 11" of the elements in the set respectively indicate that the three subframes are respectively Is the 5th, 6th, and 1st subframe of the previous radio frame. Up-and-down sub-radian intra-frame subframe label w

Frame ratio 0 1 2 3 4 5 6 7 8 9

0 6 4 6 4

1, 7, 6 4 7, 6 4

2 8, 7, 4, 6 8, 7, 4, 6

3 7, 6, 11 6, 5 5, 4

6, 5,

4 12, 8, 7, 11

4, 7

5 13, 12, 9, 8, 7, 5, 4, 11, 6

6 7 7 5 7 7

For a certain PDCCH scheduled in a downlink subframe or a special subframe corresponding to an element in the downlink associated subframe set index, it is assumed that the occupied initial CCE label is n _CCE , and the corresponding allocated uplink ACK channel label is first Select one from the set ^ {0,1,2,3}; 7 values make

N _p < n _CCE < N _p+1 , and then substitute the obtained ρ value

Np ⁽ uccH = (M - m - \) x N _p + mx N _p+l + n _CCE + N _CCH

The calculated uplink ACK channel label is calculated, where ^^^ indicates the starting offset of the uplink ACK channel mapped according to the CCE label in all PUCCH (Physical Layer Uplink Control CHannel) format 1/la/lb channel Set,

N _p = max {0,

Is the downlink system bandwidth represented by the number of resource blocks, N is the number of consecutive subcarriers occupied by a resource block in the frequency domain, and L" represents a rounding down operation.

It can be seen from Table 1 that when the LTE TDD system adopts the uplink and downlink subframe ratios 1 and 3, the number of elements in the downlink associated subframe set index is different in different uplink subframes, and the uplink ACK channel mapping starting offset is set at this time. When A3⁄4 _COT is set, it is set according to the maximum number of elements in the index of the uplink and downlink associated subframe set. For example, when the uplink and downlink subframe ratio is 3, the maximum number of elements in the downlink associated subframe set index is 3, that is, the uplink ACK channel resource is reserved according to the number of CCEs of the three downlink subframes. Number of elements in the index of the downlink associated subframe set of an uplink subframe When there are few, for example, in subframe 3 and subframe 4 in the uplink and downlink subframe ratio 3, the reserved uplink ACK channel resources may exceed the actual demand, and the resource blocks corresponding to the idle uplink ACK channels may be dynamic in the LTE TDD system. The ground is scheduled for PUSCH transmission.

However, in the LTE system, the mapping method is applied to the nCCE ⁿ PUCCH in the LTE-A TDD system.

After that, these idle uplink ACK channels are not continuous, and it is difficult to be dynamically scheduled for PUSCH transmission at the same time. In the LTE-A TDD system, when different uplink ACK channel mapping start offsets are respectively set for each DL CC in at least one DL CC of the same UL CC mapping uplink ACK channel, also according to each DL CC The corresponding maximum number of elements in the downlink associated subframe set index is set. Figure 1 shows an example in which all component carriers use the uplink-downlink subframe ratio of 3, and allocate the corresponding uplink ACK channel to the PDCCHs sent by the three DL CCs in the same UL CC; Up to 3 subframes in the downlink associated subframe set index when the uplink-downlink subframe ratio is 3, so the uplink ACK channel mapping start offset is set according to 3 subframes; in subframes 3 and 4 of the UL CC. The uplink ACK channels allocated for the two subframes in the downlink associated subframe set index of each DL CC are respectively shown in the gray and black small blocks in FIG. 1, and the reserved uplink ACK channel corresponding to one subframe is idle. As shown in the white small block in Figure 1, each of the small blocks corresponds to at least one consecutive upstream ACK channel. Also when the system is lightly loaded, the three downlink sub-frames in DL CC, the channel occupied by the PDCCH OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency-division multiplexing) a smaller number of symbols n _CFI, e.g. _"Cf = ² Then, the initial CCE label occupied by the PDCCH channel " _{CC £} is less than P = " _OT = 2). After the uplink ACK channel is allocated, the third small block allocated to each subframe is also an idle uplink ACK. At this time, all the idle uplink ACK channels are as shown in Figure 1. As can be seen from the figure, the idle uplink ACK channels in the uplink ACK channels reserved for each DL CC are discontinuously distributed, and these discontinuous idles The resource block corresponding to the uplink ACK channel cannot be utilized during data transmission, so waste is formed.

In the embodiment of the present invention, an idle uplink ACK channel block caused by a small number of actually associated subframes and a small value is organized into a continuous distribution by an allocation rule, and these idle uplinks may be used. The resource blocks corresponding to the ACK channel are aggregated to better support dynamic scheduling of PUSCH transmissions on these resource blocks. At the same time, the signaling sent by the base station can be effectively reduced. 2 is a schematic diagram of an embodiment of a downlink subframe allocation sequence number, an allocation sub-block number, and an uplink ACK channel of at least one DL CC according to the present invention. This embodiment includes:

Step 201: Assign a sequence number to at least one DL CC and/or a downlink subframe.

Step 202: Divide a sub-block for an uplink ACK channel corresponding to a downlink subframe of the DL CC, and allocate a sub-block label;

Step 203: Allocate an uplink ACK channel to the at least one DL CC according to the order of increasing the foregoing sequence number and then incrementing the foregoing sub-block number.

This embodiment is applicable to the LTE-A TDD and LTE-A FDD systems, and the base station allocates an uplink ACK channel to the DL CC. Before allocating the uplink ACK channel, the base station divides the DL CC into pairs and unpaired, and then assigns the carrier mapping sequence number to them. For the TDD system, the subframe mapping sequence number needs to be allocated after the carrier mapping sequence number is allocated. According to the above sequence number and sub-block number, the 4 _Cff of the uplink ACK channel to be allocated is obtained by calculating the formula. The following is a detailed description of each step.

In the LTE-A system, the LTE UE can only access one UL CC and one DL CC at the same time, and the LTE-A UE can simultaneously access A UL CC and A _Di DL CC, where both A _m and A _Di are positive integers. And the two can be different.

For the LTE-A UE, when the number of configured DL CCs is > 1 and the PDCCH is transmitted on the configured DL CC, it may be the same according to the correspondence between the DL CC where the LTE-A UE PDCCH is located and the UL CC where the uplink ACK channel is located. The UL CC allocates an uplink ACK channel to a PDCCH that is transmitted to the LTE-A UE under a plurality of DL CCs. A corresponding relationship is that the uplink ACK channels allocated for the PDCCHs sent by the multiple DL CCs are dispersed in the configured UL CCs, as shown in the example in FIG. 3, where DL CC 1 and DL CCs are configured for one LTE-A UE. 2. DL CC 3, UL CC 1 and UL CC 2, the PDCCH sent by DL CC 1 is assigned an uplink ACK corresponding to UL CC 1 The PDCCH transmitted by the DL CC 2 and the DL CC 3 allocates a corresponding uplink ACK channel in the UL CC 2. Another type of correspondence is that the uplink ACK channels allocated by the PDCCHs that are allocated by all the configured DL CCs are concentrated in a certain UL CC, as shown in FIG. 4 , where DL CC 1 and DL CC are configured for a certain LTE-A UE. DLCC 3, ULCC 1 ^ULCC2, PDCCHs transmitted in DLCC 1, DL CC 2, and DL CC 3 are all concentrated on the uplink ACK channel corresponding to the UL CC 2 allocation. Among them, in the description of the example, it is from the perspective of an LTE-AUE. From a system perspective, the correspondence between the DL CC where the PDCCH of each LTE-A UE and the uplink ACK channel are located may be the same or different.

From a system perspective, for a UL CC, as long as there is at least one LTE-AUE and/or a PDCCH that is sent by the LTE UE in the DL CC to allocate a corresponding uplink ACK channel in the UL CC, then the UL CC is the DL. The PDCCH delivered by CC i reserves and allocates an uplink ACK channel.

For convenience of description, in the embodiment of the present invention, if one ULCC and one DLCC can be simultaneously accessed by one LTE UE, it is called a component pair component carrier, and will be called a pair of component carriers of each other; otherwise, it is called a group. Unpaired member carriers, and will be referred to each other as the unpaired member carrier of the other party. In Figures 3 and 4, ULCC1 and DLCC 1, ULCC 2 and DLCC 2 are such two component pairs of component carriers; in the remaining case, one UL CC and one DL CC constitute a set of unpaired component carriers.

In step 201, when the base station is to be in a certain ULCC, it is 4) (4) ≥ 1) DLCC, .... When the uplink ACK channel is allocated to the PDCCH channel, the LTE-A TDD system can be similar to the LTE TDD system, according to the uplink and downlink subframe ratio setting of the component carrier and the HARQ timing relationship, and the UL CC is defined as 4) DL CCs respectively. Downlink associated subframe set index. When the uplink and downlink subframe ratio settings are the same, it is recommended to use the same downlink associated subframe set index as the LTE TDD system, as shown in Table 1. The actual number of subframes associated with each DL CC is the number of elements in the downlink associated subframe set index defined for the current uplink subframe of the UL CC. The foregoing allocation sequence number may be a direct unified number allocation of at least one downlink associated subframe of the at least one DL CC, and the subframe mapping sequence number in the DL CC has been given in consideration of the order of the elements in the downlink associated subframe set index. The sequence number assigned is composed of a carrier mapping sequence number and a subframe mapping sequence number. The sequence number assigned to each downlink associated subframe of the at least one DL CC that maps the uplink ACK channel in the same UL CC is specifically: assigning a carrier mapping sequence number to the unpaired DL CC in the 4) DL CCs according to the downlink associated subframe set index The element order is assigned a subframe mapping sequence number w for each associated downlink subframe within each DL CC.

For the LTE-A FDD system, the actual number of subframes associated with each DL CC is 1. The sequence number assigned to each downlink associated subframe of the at least one DL CC of the same UL CC mapping uplink ACK channel is specifically: assigning a carrier mapping number to the unpaired DL CC of the 4 DL CCs

In the process of allocating the carrier mapping sequence number, the carrier mapping sequence number is only allocated for the unpaired DL CCs of the four DL CCs, so that the paired DL CCs adopt the uplink ACK channel allocation mechanism of the LTE system to maintain the LTE UE. Backward compatibility. That is, the at least one DL CC is at least one unpaired DL CC.

Considering that assigning the same carrier mapping sequence number to two DL CCs causes the allocated uplink ACK channels to be in the same area, there may be uplink ACK channel collisions between DL CCs. It is recommended to assign different carrier mapping numbers to different DL CCs. When there is and only DL CC. When a pair of component carriers is 4 ≥ ² , assigning different carrier mapping numbers to the unpaired DL CCs in 4) DL CCs can be regarded as a set {' , ···, U to the set {0,···, 4 _ ² } - mapping.

After assigning the carrier mapping sequence number to the unpaired DL CC, the base station may notify the LTE-A UE of the assigned carrier mapping sequence number in the following manner. In the first mode, the base station transmits a carrier mapping sequence number assigned to the unpaired DL CC in the paired DL CC broadcast of the UL CC. Manner 2: The assigned carrier mapping sequence number is mapped according to the unpaired DL CC label of the notification according to the preset rule. Further, the preset rule may be a mapping of the carrier label to the carrier mapping sequence number. Manner 3: For the LTE-A UE, the base station notifies at least the carrier mapping sequence number of the unpaired DL CC configured by the LTE-A UE by using UE-specific signaling. In step 202, the first label allocation module of the base station divides the sub-blocks for the uplink ACK channel corresponding to the downlink subframe of the DL CC, and allocates the sub-block labels.

The above divided sub-blocks are performed according to different CCE numbers when the PDCCH channel occupies a different number of OFDM symbols n _CFI .

In the expanded discussion of steps 202 and 203, it is assumed that step 201 is to assign a carrier mapping sequence number to the unpaired DL CCs of the 4) DL CCs. The at least one DL CC is at least one unpaired DL CC and is not paired with DL CCs. The number is - impair , \< A _ impair <A^, 0<q<A_ impair.

For a DL CC to which a carrier mapping sequence number is assigned, the number of CCEs when the value is P is NZ ^E =

The bandwidth indicated by the number of resource blocks of DL cc to which the carrier map number is assigned, N _c = i, L" represents a rounding operation.

For the DL CC to which the carrier mapping sequence number ^ is allocated, the uplink ACK channel corresponding to one downlink subframe is divided into sub-blocks, and the first P sub-blocks are composed of N uplink ACK channels, then the Pth sub-block is composed of N _q , d The number consists of consecutive uplink ACK channels. N represents the number of OFDM symbols occupied by the DL CC PDCCH channel to which the carrier mapping sequence number is allocated "the number of uplink ACK channels allocated when _OT = P.

When assigning an uplink ACK channel to each CCE, there is

Where ma _X {x,j} denotes the larger of X and y. It is considered that the allocation of the corresponding uplink ACK channel for the PDCCH channel delivered by the unpaired DL CC may only occur in the LTE-A UE, and there is no need to consider backward compatibility with the LTE UE. When an uplink ACK channel is allocated to an unpaired DLCC, some overhead compression mechanism may be introduced to reduce the overhead of the corresponding uplink ACK channel. An overhead compression mechanism is that the base station broadcasts the number of uplink ACK channels that are reserved for unpaired DL CCs, at this time for the LTE-A FDD system.

For the LTE-A TDD system A^=min{N , m _ax {0,N }} , where N^ denotes the downlink subframe pre-corresponding to the unpaired DL CC to which the carrier mapping sequence number is assigned in the LTE-A FDD system The number of uplink ACK channels reserved, where ^ represents the number of uplink ACK channels reserved for the downlink subframe corresponding to the wth element of the downlink associated subframe set index of the unpaired DL CC to which the carrier mapping sequence number is allocated in the LTE-A TDD system, Min{x,j } means taking the smaller of x and y. Another type of overhead compression mechanism is a resource compression factor used by a base station to broadcast an uplink ACK channel reserved for an unpaired DL CC to which a carrier mapping sequence number is assigned, where is a positive integer, where Π represents

Round up the operation.

The above-mentioned allocation sub-block label is assigned a sub-block label according to the CCE label " _{CC £} . Further, the CCE label n _CCE is a label of the CCE occupied by the UE PDCCH channel. When the PDCCH channel occupies multiple CCEs, it may also be a PDCCH channel. The starting CCE label occupied.

The specific process of allocating the sub-block label P according to the CCE label n _CCE is: selecting a P from the set {0, 1, 2, 3} in the downlink subframe labeled with the carrier mapping sequence number as " _CC " The value is such that N _q , _p ≤ fO < N _q , _{p + l} , assign sub-block numbers where /(" _{CC £} ) represents a function of the CCE label " _{CC £} .

When the overhead compression mechanism is not introduced, ie A^ = ma _X {0, N }, there is /(" _CC£ ) = " _{CC £} ; when the overhead compression mechanism is introduced, there is /(" for the LTE-A FDD system. _CC£ ) = "CCE

~SF

K or f(n _CCE CCE

) = mod(" _CC + mod W + 1, 2) x ACK for LTE-A TDD systems

N.

CCE or CCE

f(n _CCE ) f(ji _CCE ) = mod(" _CC£ + mod(N^ ^c _m ^K + 1, 2) x ACK N _q ^Ac _m ^K ) , where

K N

Step 203: Assign an uplink ACK channel to the at least one DL CC according to the sequence of incrementing the sequence number and then incrementing the sub-block number.

For the paired DL CCs in 4) DL CCs, the uplink ACK channel allocation mechanism of the LTE system is reused in order to maintain backward compatibility with the LTE UE, and will not be described in detail herein. Discussed below is the process of allocating an uplink ACK channel for an unpaired DL CC.

In the LTE-A TDD system, when the sequence number is composed of a carrier mapping sequence number and a subframe mapping sequence number w, the foregoing step of incrementing the sequence number by incrementing the sequence number is at least one The DL CC allocates an uplink ACK channel, which is specifically: assigning an uplink ACK channel to at least one DL CC according to an order of increasing the carrier mapping sequence number, re-incrementing the subframe mapping sequence number w, and finally incrementing the sub-block number P; The mapping sequence number ^, the re-incrementing carrier mapping sequence number, and the order of the last sub-block number P are finally incremented to allocate an uplink ACK channel for at least one DL CC.

In the DL CC to which the carrier mapping sequence number is assigned, for the CCE labeled n _CCE in the downlink subframe corresponding to the mth element ^ of the downlink associated subframe set index, the carrier mapping sequence number q is incremented, and the subframe is incremented. The sequence of mapping the sequence number w and finally incrementing the sub-block label p, the specific process of allocating the uplink ACK channel is as follows:

Let the assigned uplink ACK channel label be _UCCH , and substitute the sub-block label P value assigned in step 202.

-l

∑ N. _p + _gl (i, p)) + ∑g ₂ (I, p) + f(n _CCE ) - N _q , _p + N _CCH , the _unpaired calculated uplink ACK channel label, where Μ, · indicating the number of associated downlink subframes given by the downlink associated subframe set index of the unpaired DL CC to which the carrier mapping sequence number is assigned,

N _{i p+} "N _ip if M _; > m

0 other

A3⁄4 _{CCff fl} , indicating the initial offset of the uplink ACK channel mapped according to at least one unpaired DL CC CCE label in all PUCCH format 1/la/lb channels. The downlink associated subframe set index has the same number of associated downlink subframes M, where gi ( P ) = mx (N _{! +1} - Ν _ρ ) , g ₂ ( , p) = N _{! +1} - Ν _ρ . In the DL CC to which the carrier mapping sequence number is assigned, for the CCE labeled n _CCE in the downlink subframe corresponding to the mth element ^ of the downlink associated subframe set index, the sequence number is incremented according to the first incrementing subframe, and the carrier is incremented. The mapping sequence number ^, the order of the last incrementing sub-block label P, the specific process of allocating the uplink ACK channel is as follows: Let the assigned uplink ACK channel label be _UCCH , and substitute the sub-block label value assigned in step 202.

-l -l

n _CCH = ∑ ,. x N, _p +∑M _t x (N, _p+1 - N, _p ) + mx (Λ^ ₊₁ - N _q + f(n _CCE ) - + N _UCCH , calculated in _U Obtaining an allocated uplink ACK channel label, where Μ,· indicates the number of associated downlink subframes given by the downlink associated subframe set index of the DL CC to which the carrier mapping sequence number is assigned, A3⁄4 _{cai fl} ,> indicates according to at least one unpaired DL CC The initial offset of the CCE label mapped uplink ACK channel in all PUCCH format 1/la/lb channels.

For the LTE-A FDD system, the sequence number is composed of a carrier mapping sequence number, and the uplink ACK channel is allocated to at least one DL CC according to the sequence of incrementing the sequence number and then incrementing the sub-block number, which is specifically: The order of the sub-block labels P is incremented to allocate an uplink ACK channel for at least one DL CC. The actual number of subframes associated with each DL CC described above is 1 „

In the DL CC to which the carrier mapping sequence number is assigned, for the corresponding downlink subframe, the label is n _CCE ^CE, and the specific process of allocating the uplink ACK channel according to the order of increasing the carrier mapping sequence ^ and incrementing the sub-block label P is as follows: :

Let the assigned uplink ACK channel label be _CCH , and substitute the sub-block label assigned in step 202 into npucc =

Calculating the assigned uplink ACK channel label, where

Indicates the starting offset of the uplink ACK channel mapped according to at least one unpaired DL CC CCE label in all PUCCH format 1/la/lb channels.

In the LTE-A TDD system, when an uplink ACK channel is allocated for at least one DL CC that maps an uplink ACK channel on the same uplink component carrier, the maximum number of elements in the downlink associated subframe set index corresponding to each DL CC is to be used. To set it up. The embodiment of the present invention proposes to map an uplink ACK channel on the same uplink component carrier according to the actual number of subframes associated with each DL CC. Each downlink associated subframe of the at least one DL CC is allocated a sequence number, and the uplink ACK channel allocated in the subframe divides the sub-block and allocates the sub-block label, and the order of the sub-block label is incremented by increasing the sequence number to be at least one DL CC. The uplink ACK channel is allocated. Continuing with the example of FIG. 1, H殳DL CC 3 is a pair of DL CCs, and when the carrier mapping numbers 0 and 1 are respectively assigned to the unpaired DL CC 1 and DL CC 2, the uplink ACK channels are allocated for the paired and unpaired DL CCs. Notifying the mapping start offset U _CCH , x _CH , _u , _{ir respectively} , according to the order of increasing the carrier mapping sequence number, the incrementing subframe mapping sequence number, and the last increasing sub-block number, the uplink ACK channel allocated for each DL CC is as shown in the figure. 5 is shown. As can be seen from FIG. 4, the embodiment of the present invention can organize idle uplink ACK channel blocks caused by fewer actual associated subframes and smaller values corresponding to unpaired DL CCs into a continuous distribution, and thus can be better. The physical layer uplink shared channel is dynamically scheduled on the resource blocks corresponding to the idle uplink ACK channel blocks.

In the meantime, the embodiment of the present invention can prevent the base station from notifying an uplink ACK channel mapping start offset for each DL CC, and notifying the common uplink ACK channel mapping start offset for the unpaired DL CC, which can effectively reduce the base station sending Signaling. At the same time, the method can also be used in FDD systems to maintain the same design of LTE-A TDD and FDD systems. In the LTE-A FDD system, the idle uplink ACK channel blocks of the unpaired DL CC due to the smaller " _OT value" can be organized into a continuous distribution, and the resources corresponding to the idle uplink ACK channel blocks can be better supported. The physical layer uplink shared channel is dynamically scheduled on the block. Figure 6 is a schematic diagram 601 of an embodiment of the present invention for reserving an uplink ACK channel for at least one DL CC, which is reserved for at least one DL CC according to the maximum number of subframes associated with the DL CC. Uplink ACK channel;

Step 602: Assign a sequence number to at least one DL CC and/or a downlink subframe.

Step 603: Divide a sub-block for an uplink ACK channel corresponding to a downlink subframe of the DL CC, and allocate a sub-block label; Step 604: Allocate an uplink ACK channel for at least one DL CC according to the order of increasing the foregoing sequence number and then incrementing the foregoing sub-block number.

This embodiment is applicable to the LTE-A TDD and LTE-A FDD systems, and the base station allocates an uplink ACK channel to the DL CC. Before allocating the uplink ACK channel, the base station reserves an uplink ACK channel for some DL CCs, then divides the DL CC into pairs and unpaired, and then assigns a carrier mapping sequence number to them. For the TDD system, the carrier mapping sequence number is allocated. Then, the subframe mapping sequence number needs to be allocated, and according to the above sequence number and the sub-block label, the n _CCH of the uplink ACK channel to be allocated is obtained by calculating a formula. Each step is explained in detail below.

In step 601, for the LTE-A TDD system, the LTE TDD system may be similar to the LTE TDD system, according to the uplink and downlink subframe ratio setting of the component carrier and the HARQ timing relationship, and the downlink component carrier is defined as the downlink associated subframe set index for the at least one DL CC. . When the uplink and downlink subframe ratio settings are the same, it is recommended to use the same downlink associated subframe set index as the LTE TDD system. A simple resource reservation method is to reserve an uplink ACK channel for at least one DL CC according to the maximum number of elements in the downlink associated subframe set index of each DL CC, that is, the maximum number of subframes associated with the DL CC. For the LTE-A FDD system, the maximum number of subframes associated with each DL CC is 1.

The uplink ACK channel resource reserved for the at least one DL CC informs the UE by indicating a starting offset A3⁄4 _C in all PUCCH format 1/la/lb channels of the uplink ACK channel mapped according to the at least one DL CC CCE label. When the at least one DL CC refers to at least one unpaired DL CC, the initial offset A3⁄4 _COT of the uplink ACK channel mapped according to the at least one DL CC CCE label in all PUCCH formats 1/la/lb channel means Λ3⁄4^ , _Μ _{ρ ρ} , this parameter can be broadcasted by the base station to inform the UE. In addition, for each pair of DL CCs, the base station also broadcasts a different uplink ACK channel mapping start offset and transmits the notified uplink ACK channel. The initial offset is mapped to reserve uplink ACK channel resources.

For an uplink component carrier, the allocation of the uplink ACK channel to the PDCCH channel delivered by the unpaired DL CC may only occur in the LTE-A UE, so this part of the resource allocation may not consider the backward compatibility of the LTE UE. In order to reduce the resource overhead of the uplink ACK channel, it is an unpaired DL CC. The reserved uplink ACK channel resources may not be reserved according to the maximum number of CCEs as in the LTE system, but introduce some overhead compression mechanism. The overhead compression mechanism is the number of uplink ACK channels that the base station broadcasts to notify for unpaired DL CCs, such as or. Another type of overhead compression mechanism is a resource compression factor used by the base station to notify the unpaired DL CC of the uplink ACK channel, for example, where a positive integer is used, which may be the same or different for each unpaired DL CC. When the resource compression factor is notified, the number of uplink ACK channels reserved for the unpaired DL CC to which the carrier mapping sequence number is assigned is calculated according to the notified resource compression factor, for example, for max - 4)] / 3 ό]

LTE-A TDD system ACK

, ACK {0丄[ (for LTE-A FDD system)

SF , where ^ denotes a PDCCH within a subframe

The maximum number of OFDM symbols occupied by the K channel. In the LTE system, ^ can be 2 3 or 4 depending on the downlink system bandwidth and whether it is a subframe carrying the TDD system synchronization channel.

In the steps 602 to 604, the base station allocates the uplink ACK channel to the at least one DL CC according to the sequence number and the sub-block number. The base station allocates the uplink ACK channel to the DL CC that has reserved the ACK channel, and the specific allocation method is the same as steps 201 to 203. That is, the DL CC with the ACK channel reserved is allocated a set of ACK channels according to step 302.

The embodiment of the present invention proposes to allocate a carrier mapping sequence number to at least one DL CC of the same UL CC mapping uplink ACK channel, and reserve an uplink ACK channel for at least one DL CC according to the maximum number of subframes associated with the DL CC, according to the sequence number and the sub-block number. To continuously allocate an uplink ACK channel for at least one DL CC. The embodiments of the present invention can organize idle uplink ACK channel blocks corresponding to unpaired DL CCs into a continuous distribution, thereby better supporting dynamic scheduling of PUSCH transmissions on resource blocks corresponding to the idle uplink ACK channel blocks.

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention, where the base station in this embodiment includes: a first sequence number allocation module 701, configured to allocate a sequence number for at least one DL CC and/or a downlink subframe;

a first label allocation module 702, configured to divide a sub-block for an uplink ACK channel corresponding to a downlink subframe of the DL CC, and allocate a sub-block label;

The first channel allocation module 703 is configured to allocate an uplink ACK channel to the at least one DL CC according to the sequence of incrementing the sequence number first and then incrementing the sub-block number.

It can also include:

The first sending module 704 is configured to send a carrier mapping sequence number or a CC label allocated by the first sequence number assigning module;

It can also include:

The first reservation module 705 is configured to reserve an uplink ACK channel for the at least one DL CC according to the maximum number of subframes associated with the DL CC, and send the reservation result to the first sequence number allocation module.

The embodiments of the present invention are used in the embodiments shown in FIG. 2 and FIG. 6, and their features are not described again. FIG. 8 is a schematic structural diagram of a UE according to an embodiment of the present invention. The UE in this embodiment includes: a second channel allocation module 801, configured to allocate an uplink ACK to at least one DL CC according to an order of increasing a sequence number and then incrementing a sub-block number. channel.

It can also include:

The first receiving module 802 is configured to receive a carrier mapping sequence number or a CC label, and send the carrier mapping sequence number to the second channel allocation module or send the CC label to the first mapping module.

If the first receiving module receives the CC label, it also includes:

The first mapping module 803 is configured to map the allocated carrier mapping sequence number according to the received CC label according to a preset rule.

The embodiments of the present invention are used in the embodiments shown in FIG. 2 and FIG. 6, and their features are not described again. Through the description of the above embodiments, those skilled in the art can clearly understand this The invention can be implemented in hardware or by means of software plus the necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described above in accordance with various embodiments of the present invention.

A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention.

It will be understood by those skilled in the art that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment as described in the embodiment, or may be correspondingly changed in one or at least one apparatus different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into at least one sub-module.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Claim

A method for allocating a multi-carrier ACK channel, comprising: assigning a sequence number to at least one DL CC and/or a downlink subframe;

And dividing a sub-block for the uplink ACK channel corresponding to the downlink subframe of the DL CC, and allocating the sub-block label; and allocating the uplink ACK channel to the at least one DL CC according to the sequence of incrementing the sequence number and then incrementing the sub-block label.

The method for allocating a multi-carrier ACK channel according to claim 1, wherein the assigning a sequence number to the at least one DL CC and/or the downlink subframe comprises:

For the TDD system:

Allocating a carrier mapping sequence number to at least one DL CC;

According to the actual number of subframes associated with each DL CC, for the uplink mapping on the same UL CC for the FDD system:

A carrier mapping sequence number is assigned to at least one DL CC.

The method for allocating a multi-carrier ACK channel according to claim 2, wherein the actual number of subframes is determined according to a downlink subframe ratio setting and a HARQ timing relationship of the component carrier.

The method of multi-carrier ACK channel allocation according to claim 2, wherein the at least one DL CC comprises at least one DL CC that is not paired with a UL CC that maps an uplink ACK channel.

The method for allocating a multi-carrier ACK channel according to claim 2, wherein the allocating the subframe mapping sequence number comprises: assigning a subframe mapping sequence number according to an element sequence of the downlink associated subframe set index.

The method for allocating the multi-carrier ACK channel according to claim 2 or 5, wherein assigning the carrier mapping sequence number and allocating the subframe mapping sequence number comprises: assigning different DL CCs to different DL CCs Carrier mapping sequence number; Different subframe mapping sequence numbers are assigned to different subframes.

The method for allocating a multi-carrier ACK channel according to claim 1, wherein the sub-block of the uplink ACK channel corresponding to the downlink subframe of the DL CC includes: an uplink ACK corresponding to the row subframe Channel partitioning sub-blocks; the assigning sub-block labels includes allocating sub-block labels according to CCE labels.

The method for allocating multi-carrier ACK channel according to claim 7, wherein the CCE label is a label of a CCE occupied by a UE PDCCH channel, and is a PDCCH channel when the PDCCH channel occupies at least two CCEs. The label of the starting CCE occupied.

The method for allocating a multi-carrier ACK channel according to claim 7, wherein the assigning the sub-block number according to the CCE label comprises:

Select a P value from the set P ^e {0, i, ² , 3} such that ^N q 'p ^{≤ /(} "c < , where CCE is the number of ⁿ cc _E in the downlink subframe to which the carrier mapping number ^ is assigned. CCE, the allocation sub-block number P, where ") represents a function of the CCE label ⁿ cc _E , and represents the number of uplink ACK channels included in the first P sub-blocks of one downlink subframe of the DL CC to which the carrier mapping sequence number is assigned.

The method for allocating multi-carrier ACK channel according to claim 2, wherein the uplink ACK is allocated to at least one DL CC according to the sequence of incrementing the sequence number and incrementing the sub-block number. Channel, including:

For the TDD system:

Allocating an uplink ACK channel to at least one DL CC according to an order of incrementing the carrier mapping sequence number, incrementing the subframe mapping sequence number, and finally incrementing the sub-block label; or

Allocating an uplink ACK channel to at least one DL CC according to an order of increasing the subframe number, increasing the carrier mapping sequence number, and finally incrementing the sub-block label;

For the FDD system: The uplink ACK channel is allocated to at least one DL CC according to the order of incrementing the carrier mapping sequence number and incrementing the sub-block label.

The method for allocating multi-carrier ACK channel according to claim 10, wherein, for the TDD system, the sequence of the first incremental carrier mapping sequence number, the re-incrementing subframe mapping sequence number, and the last incremental sub-block number Allocating an uplink ACK channel for at least one DL CC includes:

Substituting the assigned sub-block label P value

∑(M _{ N. _p + _gl ( , p)) +∑g ₂ (i, p) + f(n _CCE , - N _q , _p + N _UCCH , the assigned uplink ACK channel number 4 is calculated in _unpair

Its towel:

M, indicating the number of associated downlink subframes given by the downlink associated subframe set index of the unpaired DL CC to which the carrier mapping sequence number is assigned,

A3⁄4 _{CQ/ a} , indicating the initial offset of the uplink ACK channel mapped according to at least one unpaired DL CC CCE label in all PUCCH format 1/la/lb channels,

12. A method for multi-carrier ACK channel allocation according to claim 11, wherein gi ('', P) = mx when the unpaired DL CCs have the same uplink-downlink subframe ratio. (N _{! +1} - Ν _ρ ) , g ₂ ( , ρ) = - Ν _ρ .

The method for allocating multi-carrier ACK channel according to claim 10, wherein, for the TDD system, the sequence of the first-incremented subframe mapping sequence number, the re-incrementing carrier mapping sequence number, and the last incremental sub-block number Allocating an uplink ACK channel for at least one DL CC includes: Substituting the assigned sub-block label P value into CCH = ∑^ Χ N, _p + ∑ , . x (N, _p+1 - N, _p ) + mx (Λ^ ₊₁ - N _Q + f(n _CCE ) - + _CCH , _un calculated to get the assigned uplink ACK channel label "^c^;

Its towel:

^M ' denotes the number of associated downlink subframes given by the downlink associated subframe set index of the DL CC to which the carrier mapping sequence number '' is allocated, and Η denotes the uplink ACK channel mapped according to at least one unpaired DL CC CCE label in all PUCCH formats 1 The starting offset in the /la/lb channel.

The method for allocating a multi-carrier ACK channel according to claim 10, wherein, for the FDD system, the at least one DL CC is allocated according to an order of increasing the carrier mapping sequence number and incrementing the sub-block number. The uplink ACK channel includes:

Substituting the assigned sub-block label P value

= ΥΝ + Σ Ν _Ρ + fi ⁿ cCE ) +

Its towel:

A3⁄4 _C o _ai denotes the initial offset of the uplink ACK channel mapped according to at least one unpaired DL CC CCE label in all PUCCH format 1/la/lb channels.

The method for allocating a multi-carrier ACK channel according to claim 1, further comprising: before the assigning a sequence number to the at least one DL CC and/or the downlink subframe, further comprising: according to a maximum associated with the DL CC The number of subframes is reserved for the uplink ACK channel for at least one DL CC.

The method for allocating a multi-carrier ACK channel according to claim 1, wherein before the allocating the uplink ACK channel, the method further comprises:

The uplink ACK channel mapping start offset is separately notified for the paired and unpaired DL CCs.

17. A base station, comprising: a first sequence number allocation module, configured to allocate a sequence number to the at least one DL CC and/or the downlink subframe; the first label allocation module, configured to divide the sub-block for the uplink ACK channel corresponding to the downlink subframe of the DL CC, and allocate the sub-block Label

And a first channel allocation module, configured to allocate an uplink ACK channel to the at least one DL CC according to the sequence of incrementing the sequence number and then incrementing the label.

The base station according to claim 17, comprising: a first sending module, configured to send a carrier mapping sequence number or a CC number.

The base station according to claim 17, further comprising: a first reservation module, configured to reserve an uplink ACK channel for the at least one DL CC according to a maximum number of subframes associated with the DL CC.

20. A UE, comprising:

And a second channel allocation module, configured to allocate an uplink ACK channel for at least one DL CC in an order of increasing the sequence number and then incrementing the label.

The UE according to claim 20, further comprising: a first receiving module, configured to receive a carrier mapping sequence number or a CC label.

22. A UE according to claim 20, wherein if the CC number is received, the method further includes:

The first mapping module is configured to map the assigned carrier mapping sequence number according to the received CC label according to a preset rule.

A system for multi-carrier ACK channel allocation, comprising: a base station: the base station is configured to allocate a sequence number for at least one DL CC and/or a downlink subframe; and is an uplink ACK channel corresponding to a downlink subframe of the DL CC Dividing a sub-block, and allocating a sub-block label; for assigning an uplink ACK channel to at least one DL CC according to an order of increasing the foregoing sequence number and then incrementing the sub-block number; The order of the labels is to allocate an uplink ACK channel for at least one DL CC.