WO2014040296A1

WO2014040296A1 - Downlink sub-frame feedback method, base station and user equipment

Info

Publication number: WO2014040296A1
Application number: PCT/CN2012/081484
Authority: WO
Inventors: 李毓蕙; 邴立东; 刘洋
Original assignee: 华为技术有限公司
Priority date: 2012-09-17
Filing date: 2012-09-17
Publication date: 2014-03-20
Also published as: CN103828281B; CN103828281A

Abstract

The present invention relates to a downlink sub-frame feedback method, comprising: sending a plurality of downlink sub-frames to a user equipment in a physical downlink control channel, the plurality of downlink sub-frames comprising a multimedia broadcast multicast single frequency network (MBSFN) sub-frame; in a resource block for receiving ACK feedback information about non-MBSFN sub-frames in the plurality of downlink sub-frames in a physical uplink control channel, receiving ACK feedback information which is sent by the user equipment after receiving the plurality of downlink sub-frames. The method provided in the embodiments of the present invention can save air interface resources and improve the uplink throughput.

Description

Downlink subframe feedback method, base station and user equipment

Technical field

The present invention relates to the field of communications, and specifically relates to a downlink subframe feedback method, a base station, and a user equipment. Background technique

In a time division duplex scenario, the user equipment needs to feed back downlink subframes sent by multiple base stations in one uplink subframe. Therefore, dynamic ACK code channels need to be allocated for multiple downlink subframes. At present, when a physical uplink control channel (PUCCH) code channel number is calculated under Long Term Evolution Time Division Duplexing (LTE TDD), a multicast broadcast single frequency network is reserved. The Multicast Broadcast Single Frequency Network (MBSFN) subframe does not have a Physical Downlink Shared Channel (PDSCH) and a downlink semi-static activation and translation. The ACK feedback is not required, that is, the downlink ACK resource calculation may not consider the MBSFN subframe. Summary of the invention

The object of the present invention is to provide a downlink subframe feedback method, which can reduce the air interface resources occupied by the control channel and achieve the purpose of saving air interface resources.

In an aspect, the embodiment of the present invention provides a downlink subframe feedback method, where the method includes: transmitting, in a downlink physical control channel, multiple downlink subframes to a user equipment, where the multiple downlink subframes include a multimedia broadcast multicast list Frequency network MBSFN subframe;

And receiving, in the uplink physical control channel, a non-MBSFN subframe in the multiple downlink subframes In the resource block of the ACK feedback information, the ACK feedback information sent by the user equipment after receiving the multiple downlink subframes is received.

On the other hand, the embodiment of the present invention provides a downlink subframe feedback method, where the method includes: receiving a plurality of downlink subframes that are sent by a base station in a downlink physical control channel, where the multiple downlink subframes include MBSFN subframes;

And transmitting, in the resource block of the uplink physical control channel, ACK feedback information of the non-MBSFN subframes in the multiple downlink subframes to the base station.

In another aspect, an embodiment of the present invention provides a base station, including:

a sending unit, configured to send, in the downlink physical control channel, a plurality of downlink subframes, where the multiple downlink subframes include MBSFN subframes;

a receiving unit, configured to receive, in the resource block of the uplink physical control channel, the ACK feedback information of the non-MBSFN subframe in the multiple downlink subframes, the receiving, by the user equipment, the multiple downlink subframes After sending ACK feedback information.

In another aspect, an embodiment of the present invention provides a user equipment, including:

The receiving unit receives a plurality of downlink subframes that are sent by the base station in the downlink physical control channel, where the multiple downlink subframes include MBSFN subframes;

The sending unit sends, in the resource block of the uplink physical control channel, ACK feedback information of the non-MBSFN subframe in the multiple downlink subframes to the base station.

The embodiment of the present invention provides a downlink subframe feedback method. When a base station configures an MBSFN subframe in a downlink subframe, the PUCCH channel does not reserve a dynamic ACK resource for the MBSFN subframe, thereby reducing the air interface resource occupied by the PUCCH. The uplink PUSCH bandwidth is extended to bring uplink throughput gain. DRAWINGS

In order to more clearly illustrate the technical solution in the embodiment of the present invention, the following will be given to the embodiment or the present BRIEF DESCRIPTION OF THE DRAWINGS The drawings, which are used in the technical description, are briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art, without any creative work, Other drawings may also be obtained from these drawings.

FIG. 1 is a flowchart of another embodiment of a downlink subframe feedback method according to an embodiment of the present invention; FIG. 2 is a flowchart of another embodiment of a downlink subframe feedback method according to an embodiment of the present invention; a structural diagram of the provided base station;

FIG. 4 is a structural diagram of a user equipment according to an embodiment of the present invention. detailed description

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. In the TDD-LTE system, the PUCCH bandwidth of the uplink physical control channel is divided into three parts, namely, Channel Quality Indication (CQI) + Semi-Static ACK/Scheduling Request Indication (SRI) + Dynamic ACK. , where CQI and semi-static ACK/SRI resources are determined by product configuration and specifications.

The PUCCH bandwidth is calculated as follows, where ^Λ ^ represents the number of RBs occupied by the CQI, ^ ^{= 12} , except for the 4 _CCH , which is determined by the system configuration.

Ί3 normal cyclic prefix

^C 2 extended cyclic prefix "PUCCH representation

The PUCCH maximum code channel number is determined by the maximum PUCCH code channel number of the downlink ACK feedback; N _cs is for the PUCCH format 1/la/lb coexisting with the PUCCH format 2/2a/2b on the same Resource Block (RB). The number of cyclic shifts; A ^PUGGH _shlft indicates the PUCCH cyclic shift interval, for TDD ACK feedback multiplexing Multiplexing mode and M>1, downlink ACK feedback The PUCCH code number is calculated as follows:

4 ccH,

+ / x N _p+1 + n _CCE + N3⁄4 _CCH (丄) where M represents the maximum number of uplink subframes that an uplink subframe can feed back, and Np and Np+1 are the control channel elements of the subframe. The maximum and minimum values, P, are in the range {0, 1, 2, 3}, such that < Ν _ρ+ι , is _κ

Set neutron frame "CCE starting position number used for PDCCH transmission, W^CCH is used by the upper layer configuration feedback available starting code track number.

Currently, the dynamics of all downlink subframes are reserved when calculating the PUCCH code channel number under LTE TDD.

ACK, when calculating the ACK code channel of the subframe nk ₃ , the dynamic ACK code channel is actually reserved for the three downlink subframes of (nk.) ~ (! ik ₂ ). If nk. If any subframe in nk nk ₂ is configured as an MBSFN subframe, the system PUCCH resource is wasted.

When the base station allocates the uplink PUSCH resources, in order to avoid the resource blocks of the PUCCH, it is necessary to obtain the maximum bandwidth of the corresponding PUCCH. So how to reduce the number of resources occupied by PUCCH to increase

The air interface resource that PUSCH can use is a problem to be solved by the present invention.

Set K is related to the matching of the uplink and downlink subframes of the TDD, that is, corresponding to the aforementioned K set. Downlink association set index ^κ : ¹ for for time-division duplex

TDD ) , which is Set Κ determines the set of Κ in this article.

As defined in Table 1 below:

Table 1

The evolved base station eNB needs to obtain the maximum bandwidth of the corresponding PUCCH in order to avoid the resource block RB of the PUCCH when the uplink PUSCH resource is allocated to the user equipment UE. For determining the system configuration, only the dynamic ACK resources determined by the PUCCH maximum code channel number in the PUCCH bandwidth are variable.

For the TDD ACK feedback Multiplexing mode and Μ>1, the PUCCH code channel number of the ACK feedback corresponding to the downlink scheduling on the subframe n-Ki can be obtained by the formula 4 _CC = (M - - l) x N _{p +} x N _{p+ 1 +} " _CCE ,,. + Nffi _{CCH is} derived. And can get the maximum on subframe _n

PUCCH code track number.

Example: For the TDD20M uplink-downlink subframe ratio 2, when the PDCCH is configured with 3 symbols, the PUCCH allocated for the subframe n-6 (that is, when k3 is taken) on the subframe 2 is numbered as the minimum value of 0. When the ACK minimum code track number is:

Npucch + (4-3-1)*55 + 3*88 +0 = Npucch + 264

When the CCE location number is the maximum value of 88, the maximum code channel number of the ACK in the PUCCH is: Npucch + (4-3-1)*55 + 3*88 +88 = Npucch + 352

That is, in this configuration, according to the specific allocation of the CCE resources of the PDCCH on the n-6 subframe,

The PUCCH maximum code track number on subframe 2 is between Npucch + 264 and Npucch + 352.

However, in a multicast scenario, there is no downlink PDSCH channel and downlink semi-static activation and decoding in the MBSFN subframe, and no ACK feedback is required, that is, the downlink ACK resource calculation may not consider the MBSFN subframe, thereby saving PUCCH resources and enlarging the PUSCH. Resources can increase upstream throughput.

The core idea of the embodiment of the present invention is: When the system configures an MBSFN subframe, the corresponding uplink feedback subframe does not reserve a dynamic ACK resource for the MBSFN subframe.

The embodiment of the present invention provides a downlink subframe feedback method. In this embodiment, the execution subject is an evolved base station eNB. FIG. 1 is a flowchart of a downlink subframe feedback method according to an embodiment of the present invention, where the method includes : 5101. Send, in a downlink physical control channel, a plurality of downlink subframes to the user equipment, where the multiple downlink subframes include a multimedia broadcast multicast single frequency network MBSFN subframe.

Specifically, the base station sends a downlink subframe to the UE in the PDCCH, in particular, in a system supporting the enhanced multimedia broadcast/multicast service eMBMS, in order to support the eMBMS service, a MBSFN subframe of the multimedia broadcast/multicast single frequency network is introduced. The seed frame does not require ACK feedback from the user equipment, so when the resources are allocated, there is no need to reserve feedback resources for the MBSFN subframe.

The resource block for receiving the ACK feedback information of the non-MBSFN subframe in the multiple downlink subframes in the uplink physical control channel, the receiving the user equipment, after receiving the multiple downlink subframes, sending ACK feedback information.

For the base station, after the downlink subframe is transmitted, the air interface resource occupied by the UE when the ACK is fed back is calculated, and the ACK feedback information is received at the corresponding resource location. For example, removing a first K value corresponding to the MBSFN subframe in the K set of the plurality of groups; updating a sequence number corresponding to a K value remaining after removing the first K value in the K set; The sequence number corresponding to the remaining K value is calculated, and the ACK feedback resource code track number corresponding to each downlink subframe in the multiple downlink subframes is calculated to determine the resource block.

That is, if the subframe is configured as an MBSFN subframe, the packet is excluded from the set K, for example, for the uplink and downlink subframe ratio 2, if the subframe 4 is configured as the MBSFN subframe, the table 1 is variable. For:

Table 2

The formula for calculating the code track number is still: 4 ccH, = (M - i - l) x N _p + ix N _p+l + n _CCE + N3⁄4 _CCH where _M represents the maximum number of uplink subframes that an uplink subframe can feed back, Np and Np+l are sub- Control channel element of frame

The maximum and minimum values of the CCE start number, and the range of P is {0, 1, 2, 3},

N _p ≤ _ncCE , i < N _p+l , N _p = max {θ, [[N^ x (N^ xp - 4)] / 36 J} ^ is a sub-frame in the _K set "-

The CCE starting position number of the PDCCH transmission, and the wffi _CCH is the feedback available starting code track number from the higher layer configuration.

Therefore, on the second subframe, when the CCE location number is the minimum value of 0, the ACK minimum code channel number of the PUCCH allocated for the subframe n-6 (ie, taking k2) is:

Npucch + (3-2-1)*55 + 2*88 +0 = Npucch + 176

The CCE location number is the maximum value of 88. The maximum code channel number of the PUCCH ACK is:

Npucch + (3-2-1)*55 + 2*88 +88 = Npucch + 264

That is, according to the specific allocation of the CCE resources of the PDCCH on the n-6 subframe, the PUCCH maximum code channel number on the subframe 2 is between Npucch + 176 and Npucch + 264.

Then, for the uplink feedback subframe corresponding to the MBSFN subframe, the PUCCH channel part dynamically ACK reserves resources, which can extend the uplink PUSCH bandwidth and bring the gain of the uplink throughput.

Specifically, for example, in the above embodiment, ^_ sets the PUCCH cyclic shift interval to ds2, and the subframe is a normal subframe, and the maximum number 4 of the PUCCH format 1 is reduced from Npucch+352 to Npucch+264, which is decreased by 88.

Correspondingly, by the following formula,

M―

Normal cyclic prefix

Extended cyclic prefix

It is concluded that the corresponding m value is reduced (88*ds2)/(3*12) - 4.89, that is, each PUB RB can be extended by 6 subframes per uplink subframe, and the throughput per second is increased by 45Kbits. FIG. 2 is a flowchart of a downlink subframe feedback method according to an embodiment of the present invention. In this embodiment, an execution entity is a user equipment UE. It can be seen from Figure 2 that the method comprises:

S201. Receive multiple downlink subframes that are sent by the base station in the downlink physical control channel, where the multiple downlink subframes include MBSFN subframes.

S202. Send, in the resource block of the uplink physical control channel, ACK feedback information of the non-MBSFN subframe in the multiple downlink subframes to the base station.

Specifically, after receiving the downlink subframe, the UE calculates the air interface resource occupied by the UE when the ACK is fed back, and sends the ACK feedback information at the corresponding resource location. That is, the UE removes the first K value corresponding to the MBSFN subframe in the K set corresponding to the uplink subframe for performing ACK feedback on the downlink subframe of one of the plurality of downlink subframes. And updating a sequence number corresponding to the K value remaining after the first K value is removed from the K set; and calculating, according to the sequence number corresponding to the remaining K value, corresponding to each downlink subframe of the multiple downlink subframes The ACK feeds back the resource code track number to determine the resource block.

With this embodiment, for the uplink feedback subframe corresponding to the MBSFN subframe, the PUCCH channel part dynamically ACK reserves resources, which can extend the uplink PUSCH bandwidth and bring the gain of the uplink throughput.

Correspondingly, please refer to FIG. 3, an embodiment of the present invention further provides a base station, and FIG. 3 is a structural diagram of the base station, where the base station includes:

The sending unit 301 is configured to send, in the downlink physical control channel, multiple downlink subframes to the user equipment, where the multiple downlink subframes include MBSFN subframes;

The receiving unit 302 is configured to receive, in the resource block of the uplink physical control channel, the ACK feedback information of the non-MBSFN subframe in the multiple downlink subframes, and receive, by the user equipment, the multiple downlink sub-subjects. After the frame, the ACK feedback message is sent.

Optionally, the location of the resource block may be determined by the resource block determining unit, where the resource block determining unit removes the ACK feedback resource code channel number corresponding to each downlink subframe that is not the MBSFN subframe. The K value corresponding to the MBSFN subframe in the K set, and updating the sequence number corresponding to the remaining K value, and calculating the ACK feedback resource code track number according to the updated sequence number to obtain the location of the resource block.

Correspondingly, as shown in FIG. 4, an embodiment of the present invention further provides a user equipment, where the user equipment includes:

The receiving unit 401 is configured to receive multiple downlink subframes that are sent by the base station in the downlink physical control channel, where the multiple downlink subframes include MBSFN subframes.

The sending unit 402, in the resource block of the uplink physical control channel, sends the optional to the base station, where the user equipment may calculate, by using the resource block determining unit, an ACK feedback resource code channel number corresponding to each downlink subframe, The resource block determining unit removes a first K value for the corresponding one of the plurality of downlink subframes, and updates a sequence number corresponding to the K value remaining after removing the first K value in the K set And calculating, according to the sequence number corresponding to the remaining K values, an ACK feedback resource code track number corresponding to each downlink subframe of the multiple downlink subframes, to determine the resource block.

A person skilled in the art should further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

The above described embodiments of the present invention are further described in detail, and the embodiments of the present invention are intended to be illustrative only. The scope of the protection, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

claims

1. A downlink subframe feedback method, characterized in that the method includes:

Send multiple downlink subframes to the user equipment in the downlink physical control channel, where the multiple downlink subframes include Multimedia Broadcast Multicast Single Frequency Network MBSFN subframes;

In the resource block used for receiving ACK feedback information of non-MBSFN subframes in the multiple downlink subframes in the uplink physical control channel, receive the ACK sent by the user equipment after receiving the multiple downlink subframes. Feedback.

2. The downlink subframe feedback method according to claim 1, wherein the resource blocks are determined in the following manner:

Remove the first K value corresponding to the MBSFN subframe from the K set corresponding to the uplink subframe used for ACK feedback for a non-MBSFN subframe among the plurality of downlink subframes;

Update the sequence numbers corresponding to the remaining K values in the K set after excluding the first K value; and calculate each downlink subframe in the plurality of downlink subframes based on the updated sequence numbers corresponding to the remaining K values. The corresponding ACK feeds back the resource code channel number to determine the resource block.

3. The downlink subframe feedback method according to claim 2, wherein the ACK feedback resource code channel number is calculated by the following formula:

"PUCCH,,-

_/ _{_} _{_} value and minimum value, the value range of P is {0, 1, 2, 3}, such that < Ν _ρ+ι , is _κ

"Subframe in the set" is the CCE starting position number used for PDCCH transmission, wffi _CCH feedback available starting code channel number configured by the higher layer.

4. A downlink subframe feedback method, characterized in that the method includes: Receive multiple downlink subframes sent by the base station in the downlink physical control channel, where the multiple downlink subframes include MBSFN subframes;

In the resource blocks of the uplink physical control channel, ACK feedback information of non-MBSFN subframes in the plurality of downlink subframes is sent to the base station.

5. The downlink subframe feedback method according to claim 4, wherein the resource blocks are determined in the following manner:

6. The downlink subframe feedback method according to claim 5, wherein the ACK feedback resource code channel number is calculated by the following formula:

"PUCCH,,- ^ (M - i - l) x N _p + ix N _p+1 + n _CCEJ + N¾ _CCH

Among them, M represents the maximum number of uplink subframes that can be fed back by an uplink subframe, Np and Np+1 are the maximum and minimum values of the CCE starting number of the control channel element of the subframe "^, and the value range of P is {0 , 1, 2, 3} , such that < Ν _ρ+ \ , = ^max is _K

7. A base station, characterized by including:

A sending unit, configured to send multiple downlink subframes to the user equipment in the downlink physical control channel, where the multiple downlink subframes include MBSFN subframes;

The receiving unit is configured to receive, in the resource block used for receiving ACK feedback information of non-MBSFN subframes in the plurality of downlink subframes in the uplink physical control channel, the user equipment when receiving the ACK feedback information is sent after multiple downlink subframes.

8. The base station according to claim 7, further comprising:

Resource blocks identify units used to:

From the K set corresponding to the uplink subframe used for ACK feedback to a downlink subframe of a non-MBSFN subframe among the plurality of downlink subframes. Remove the first K value corresponding to the MBSFN subframe;

Update the sequence numbers corresponding to the remaining K values in the K set after excluding the first K value; and calculate the corresponding sequence numbers of each downlink subframe in the plurality of downlink subframes based on the sequence numbers corresponding to the remaining K values after the update. The ACK feeds back the resource code channel number to determine the resource block.

9. A user equipment, characterized by including:

A receiving unit, receives multiple downlink subframes sent by the base station in the downlink physical control channel, where the multiple downlink subframes include MBSFN subframes;

The sending unit is configured to send ACK feedback information of non-MBSFN subframes in the plurality of downlink subframes to the base station in the resource block of the uplink physical control channel.

10. The user equipment according to claim 9, further comprising:

Resource blocks identify units used to: