CN107046454B

CN107046454B - Method and apparatus for receiving acknowledgement in a time division duplex based wireless communication network

Info

Publication number: CN107046454B
Application number: CN201610082544.6A
Authority: CN
Inventors: 仲崇显; 杨涛; 孙芳蕾
Original assignee: Alcatel Lucent SAS
Current assignee: Alcatel Lucent SAS
Priority date: 2016-02-05
Filing date: 2016-02-05
Publication date: 2020-06-12
Anticipated expiration: 2036-02-05
Also published as: CN107046454A

Abstract

The invention provides a response device for providing a receiving response for a transmitting party by a receiving party of wireless communication based on time division duplex, which is characterized in that at least one receiving response is not transmitted with minimum time delay. Further, the answering device comprises: an allocation module configured to allocate the plurality of received acknowledgements to a plurality of transmission time units, wherein at least one of the received acknowledgements is not transmitted with a minimum delay; and the sending module is configured to send the corresponding receiving response in the allocated sending time unit.

Description

Method and apparatus for receiving acknowledgement in a time division duplex based wireless communication network

Technical Field

The present invention relates to a reception response in a wireless communication network, and more particularly, to a method and an apparatus for reception response in a wireless communication network based on time division duplex.

Background

The Long Term Evolution (LTE) technology supports two duplex modes, Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For TDD, in an exemplary frame structure, each radio frame is 10 milliseconds (ms) in length, and is equally divided into two half frames with a length of 5ms, each half frame includes 5 subframes with a length of 1ms, which are respectively an Uplink subframe, a Downlink subframe, and a special subframe, each special subframe includes 3 fields, which are respectively a Downlink Pilot Time Slot (DwPTS), a guard interval (GP), and an Uplink Pilot Time Slot (UpPTS), and each subframe is composed of two consecutive Time slots.

Transmissions in a TDD system include: transmissions from a base station (eNB) to a User Equipment (UE) (referred to as downlink) and transmissions from the UE to the base station (referred to as uplink). Based on LTE, 10 subframes are shared by uplink and downlink within 10ms, each subframe is configured to either uplink or downlink, the subframe configured to the uplink is called an uplink subframe, the subframe configured to the downlink is called a downlink subframe, and the rest are special subframes. The TDD system supports 7 uplink/downlink configurations, as shown in table 1, where D represents a downlink subframe, U represents an uplink subframe, and S represents the above special subframe including 3 special fields, and the length of each subframe may be 1 ms.

TABLE 1 7 uplink/downlink configurations in TDD systems

At conference number 69 of The Radio Access Network (RAN) technical specification group of The third Generation Partnership Project (3 GPP), a research Project on how to reduce latency was conducted, which was aimed at studying The feasibility of reducing latency and its benefits. According to the research of RAN2, shortening the Transmission Time Interval (TTI) can effectively shorten the waiting Time. Latency in LTE and LTE-a networks is due to, to a considerable extent, the Round-Trip Delay (RTD) of Hybrid Automatic Repeat request (HARQ). Due to the inherent (Time-domain) discontinuity characteristic of uplink and downlink transmission, the HARQ Time relationship of Time Division Duplexing (TDD) is more complex than that of Frequency Division Duplexing (FDD), its RTD is more appreciable, and accordingly, the problem of latency caused by HARQ is also more serious.

The reception acknowledgement (e.g., HARQ-ACK or HARQ-NACK) on the Physical Downlink Shared Channel (PDSCH) may be transmitted on a Physical Uplink Shared Channel (Physical Uplink Shared Channel) or a Physical Uplink Control Channel (Physical Uplink Control Channel). The relation in time between the transmission of data and the corresponding reception acknowledgement is referred to as HARQ timing.

Shortening the TTI puts new requirements on HARQ timing, which cannot be met by existing HARQ timing schemes.

Disclosure of Invention

For TDD, the time relationship between the reception of data in a certain HARQ process and the transmission of a corresponding acknowledgement of reception (e.g. the receiver sends an Acknowledgement (ACK) or Not (NACK) to the sender) depends on the configuration of the uplink and downlink.

For example, in the current specification, HARQ Timing (Timing) is defined for FDD and TDD for the case of TTI length of 1 ms. The problem that the inventors of the present invention wish to solve by embodiments of the present invention is how to define these shorter TTIs and provide an adaptive HARQ timing scheme, which needs to be shortened for the aforementioned purpose of shortening the overall latency.

Some concepts are presented:

TTI: the minimum data transfer time is specifically the length of a transport block capable of being independently demodulated in a radio link, and in 3GPP LTE, it is generally considered that 1TTI is 1 millisecond, i.e., the size of a subframe, which is also a basic unit for radio resource management. The basic unit of physical layer scheduling in LTE is 1ms, and such a small time interval can make the time delay applied in LTE small. However, in some cell edge, coverage is limited, and the UE may not meet the block error rate (BLER) requirement of data transmission within a time interval of 1ms due to its own transmit power limitation. Therefore, the LTE proposes a TTI bundling concept, and binds consecutive TTIs in uplink to be allocated to the same UE, so that the probability of successful data decoding can be improved, the uplink coverage of LTE is improved, and the cost is that some time delay is increased. The eNodeB feeds back the ACK/NACK of the HARQ only after receiving all the bundled uplink frames. The 3GPP R8 release defines TTI Bundling for VoIP service, where the maximum number of continuously used TTI resources is 4, the round trip time RTT is 16ms, the modulation format is QPSK, and the maximum number of allocated RB resources is 3. The TTI Bundling can be applied to both FDD and TDD modes. The LTE uplink coverage enhancement is carried out by using 4TTIbundling, and the SINR of 1-2 dB of uplink users can be improved approximately.

HARQ bundling: AND performing logical AND (local AND) operation on the received responses (for example, ACK/NACK) corresponding to the same code word of a plurality of downlink subframes of the same serving cell to finally obtain 1-bit (non-space division multiplexing, using PUCCH format 1a) or 2-bit (space division multiplexing, using PUCCH format 1b) ACK/NACK information.

HARQ multiplexing (multiplexing): AND performing logical AND (local AND) operation on the receiving response (ACK/NACK) corresponding to 2 code words sent by the same downlink subframe of the same service cell to obtain 1-bit ACK/NACK information.

According to an embodiment of the first aspect of the present invention, there is provided an acknowledgement apparatus for providing a sender with a reception acknowledgement by a receiver of wireless communication based on time division duplex, wherein at least one reception acknowledgement is not transmitted with a minimum delay.

Further, the answering device comprises: an allocation module configured to allocate the plurality of received acknowledgements to a plurality of transmission time units, wherein at least one of the received acknowledgements is not transmitted with a minimum delay; and the sending module is configured to send the corresponding receiving response in the allocated sending time unit.

Further, the plurality of received acknowledgements corresponds to a plurality of consecutive units of received time, and the distribution module is further configured to distribute the plurality of received acknowledgements substantially evenly to a plurality of adjacent units of transmitted time.

Further, the receiving side is a user equipment, the transmitting side is a base station, and the plurality of transmitting time units include uplink subframes and special subframes.

Further, the sender employs a shortened transmission time interval, and the response apparatus further includes a subframe division module configured to divide the atomic frame into a plurality of new subframes, so that: the relative sequence relation of an uplink subframe, a downlink subframe and a special subframe in the new divided subframe is the same as that before the division; or each original uplink subframe is divided into a plurality of new uplink subframes, each original downlink subframe is divided into a plurality of new downlink subframes, and the original special subframes are not subdivided; or, each original uplink subframe is divided into a plurality of new uplink subframes, each original downlink subframe is divided into a plurality of new downlink subframes, and each original special subframe is divided into a plurality of new special subframes.

Further, the length of each new subframe is less than or equal to 0.5 milliseconds.

Further, the answering device further comprises: an obtaining module configured to obtain an updated time unit correspondence, where the updated time unit correspondence indicates which transmission time unit the reception response of each reception time unit is transmitted by, and is determined according to load information of each reception time unit; the allocating means is further configured to allocate the plurality of reception responses to the plurality of transmission time units according to the obtained updated correspondence.

According to an embodiment of the second aspect of the present invention, there is provided a wireless communication device, which is characterized by comprising the answering device of the embodiment of the first aspect.

According to an embodiment of the third aspect of the present invention, there is provided an apparatus for assisting a receiving side of wireless communication in completing a reception response to a transmitting side in a wireless communication base station based on time division duplex, the apparatus including: a determining device configured to determine a correspondence relationship between a plurality of reception responses of the receiving party and a transmission time unit for transmitting the plurality of reception responses, wherein the correspondence relationship is such that the receiving party does not transmit at least one of the reception responses with a minimum time delay; a providing device configured to provide the determined correspondence to the recipient.

Further, the auxiliary device further comprises: a judging means configured to judge whether there is wireless communication from the sender on each reception time unit of the receiver; the determining means is further configured to determine, according to a determination result of the determining means, a correspondence relationship between a plurality of reception responses of the receiving side and a transmission time unit for transmitting the plurality of reception responses.

According to an embodiment of the fourth aspect of the present invention, there is provided a wireless communication base station, which is characterized by including the auxiliary device in the embodiment of the third aspect.

According to an embodiment of the fifth aspect of the present invention, there is provided a method for providing a reception acknowledgement to a sender by a receiver of time division duplex-based wireless communication, characterized in that the receiver does not transmit at least one reception acknowledgement with a minimum delay.

Further, the method comprises: the method further includes distributing a plurality of receive acknowledgements substantially uniformly to a plurality of adjacent transmit time units, wherein the plurality of receive acknowledgements correspond to a plurality of consecutive receive time units.

Further, the sender is a base station, and the plurality of sending time units include uplink subframes and special subframes.

According to an embodiment of a sixth aspect of the present invention, there is provided a method for assisting a receiving side of wireless communication to complete a reception response to a transmitting side in a wireless communication base station based on time division duplex, including the steps of: determining a corresponding relation between a plurality of receiving responses of the receiving party and a sending time unit for sending the plurality of receiving responses, wherein the corresponding relation enables the receiving party not to send at least one of the receiving responses with the minimum time delay; providing the determined correspondence to the recipient.

By implementing the embodiment of the invention, the following effects can be realized:

1. for the dynamic HARQ timing solution provided by the invention, not only the uplink/downlink configuration of TDD is considered, but also the influence of factors such as service type, flow load, deployment environment, interference condition and the like is considered, so that the HARQ timing is more flexible, and the waiting time can be further shortened.

2. For the situation that the TTI length can be dynamically switched, the dynamic HARQ timing scheme is more flexible.

3. In the new HARQ timing solution, the transmission of the reception acknowledgement is distributed over a number of different uplink subframes, even special subframes, when conditions allow, so that especially in some uplink and downlink configurations (

e.g. configurations

2, 3, 4, 5), there is no need to transmit the reception acknowledgement for too many downlink subframes in one uplink subframe.

4. Because there is no need to send the reception response for too many downlink subframes in one uplink subframe, the UE does not need to send many bits for the reception response when HARQ multiplexing is used, avoiding a severe limitation on uplink coverage.

5. Since it is not necessary to transmit a reception acknowledgement for an excessive number of downlink subframes in one uplink subframe, the number of unnecessary retransmissions can be significantly reduced when HARQ bundling is used.

6. A new subframe division scheme which is beneficial to shortening the waiting time is provided, and a foundation is provided for realizing the shortening of the waiting time.

Drawings

The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings, wherein like elements are represented by like reference numerals, which are given by way of illustration only, and thus are not intended to be limiting of the present invention, and wherein:

FIG. 1a is a schematic diagram of a frame structure of an uplink/downlink configuration 2 using a TTI of 1 ms;

FIG. 1b is a schematic diagram of a frame structure of an uplink/downlink configuration 2 using a TTI of 0.5ms according to an embodiment of the present invention;

FIG. 1c is a simplified diagram of a frame structure of an uplink/downlink configuration 2 using a TTI of 0.5ms according to yet another embodiment of the present invention;

FIG. 1d is a schematic illustration of a special sub-frame before and after subdivision according to an embodiment of the present invention;

FIGS. 2a-2g are schematic diagrams of HARQ timing for downlinks of uplink/downlink configurations 0-6 according to embodiments of the present invention;

fig. 3a-3d are schematic diagrams of downlink HARQ timing for uplink/

downlink configurations

2, 3, 4 and 5 according to an embodiment of the present invention;

fig. 4 is a diagram of a further improved downlink HARQ timing for an uplink/downlink configuration 5 according to an embodiment of the present invention;

fig. 5a-5b are schematic diagrams of further improved downlink HARQ timing for uplink/downlink configuration 5 according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an uplink/downlink configuration 2 frame structure after dividing an original subframe into shorter subframes according to an embodiment of the present invention, wherein the length of each special subframe is still reserved as 1ms and is not subdivided;

fig. 7 is a flowchart of a method for a receiving side of a tdd-based wireless communication to provide a receiving response to a transmitting side with the aid of a base station according to an embodiment of the present invention;

fig. 8 is a schematic block diagram of an answering machine for providing a receiving answer to a transmitting party by a receiving party of wireless communication based on time division duplex according to an embodiment of the present invention;

fig. 9 is a schematic block diagram of an auxiliary apparatus for assisting a receiving side of wireless communication to complete a reception response to a transmitting side in a wireless communication base station based on time division duplexing according to an embodiment of the present invention.

It should be noted that these drawings are intended to illustrate the general nature of the methods, structures, and/or materials utilized in certain exemplary embodiments, and to supplement the written description provided below. The drawings are not necessarily to scale and may not accurately reflect the precise structural or performance characteristics of any given embodiment, and should not be construed as defining or limiting the scope of the values or attributes encompassed by example embodiments. The use of similar or identical reference numbers in the figures is intended to indicate the presence of similar or identical elements or features.

Detailed Description

While the exemplary embodiments are susceptible to various modifications and alternative forms, certain embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intention to limit example embodiments to the specific forms disclosed, but on the contrary, example embodiments are to cover all modifications, equivalents, and alternatives falling within the scope of the claims. Like reference numerals refer to like elements throughout the description of the various figures.

Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.

The term "wireless device" or "device" as used herein may be considered synonymous with and sometimes hereinafter referred to as: a client, user equipment, mobile station, mobile user, mobile terminal, subscriber, user, remote station, access terminal, receiver, mobile unit, etc., and may describe a remote user of wireless resources in a wireless communication network.

Similarly, the term "base station" as used herein may be considered synonymous with, and sometimes referred to hereinafter as: a node B, an evolved node B, an eNodeB, a Base Transceiver Station (BTS), an RNC, etc., and may describe a transceiver that communicates with and provides radio resources to a mobile in a wireless communication network that may span multiple technology generations. The base stations discussed herein may have all of the functionality associated with conventional well-known base stations, except for the ability to implement the methods discussed herein.

The methods discussed below, some of which are illustrated by flow diagrams, may be implemented by hardware, software, firmware, middleware, microcode, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware or microcode, the program code or code segments to perform the necessary tasks may be stored in a machine or computer readable medium such as a storage medium. The processor(s) may perform the necessary tasks.

Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent to", etc.) should be interpreted in a similar manner.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Portions of the exemplary embodiments and corresponding detailed description are presented in terms of software, or algorithms and symbolic representations of operations on data bits within a computer memory. These descriptions and representations are the ones by which those of ordinary skill in the art effectively convey the substance of their work to others of ordinary skill in the art. An algorithm, as the term is used here, and as it is used generally, is conceived to be a self-consistent sequence of steps leading to a desired result. The steps are those requiring physical manipulations of physical quantities. Usually, though not necessarily, these quantities take the form of optical, electrical, or magnetic signals capable of being stored, transferred, combined, compared, and otherwise manipulated. It has proven convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like.

In the following description, the illustrative embodiments will be described with reference to acts and symbolic representations of operations (e.g., in the form of flowcharts) that can be implemented as program modules or functional processes including routines, programs, objects, components, data structures, etc., that perform particular tasks or implement particular abstract data types and that can be implemented using existing hardware at existing network elements. Such existing hardware may include one or more Central Processing Units (CPUs), Digital Signal Processors (DSPs), application specific integrated circuits, Field Programmable Gate Arrays (FPGAs) computers, and the like.

It should be recognized that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise, or as is apparent from the discussion, terms such as "processing," "computing," "determining," or "displaying" or the like, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical, electronic quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices.

It should also be noted that the software implemented aspects of the exemplary embodiments are typically encoded on some form of program storage medium or implemented over some type of transmission medium. The program storage medium may be a magnetic (e.g., floppy disk or hard drive) or optical (e.g., compact disk read only memory or "CD ROM") storage medium, and may be a read only or random access storage medium. Similarly, the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art. The exemplary embodiments are not limited by these aspects of any given implementation.

The processor and memory may operate together to perform device functions. For example, the memory may store code segments relating to the functionality of the device. The code segments may in turn be executed by a processor. In addition, the memory may store processing variables and constants for use by the processor.

In the context of the present disclosure, two schemes for shortening TTI with backward compatibility are proposed first, and then HARQ timing schemes adapted thereto are introduced, including static and dynamic solutions.

● for a static solution, some assumptions will be made first. Based on these assumptions, basic HARQ timing design principles are proposed. Then, the association relationship of HARQ timing will be described in detail. Finally, the response time sequence table is given for different TDD uplink/downlink configurations.

● for the dynamic solution, the association of HARQ timing will be proposed and configured to the UE applying the shortened TTI. This solution is completely different from the static solution specified in the 3GPP standardization.

Using the above basic principles for the analytic static solution, it can be seen that for HARQ timing with a shortened TTI length (e.g., shortened from 1ms to 0.5ms), data transmission in too many downlink subframes on the downlink shared channel needs to be acknowledged (ACK or NACK is sent) in a single uplink subframe, especially for some downlink partial reconfiguration (DL-heavy configuration, e.g.,

configurations

2, 3, 4, and 5). Therefore, we propose some enhanced solutions to further solve the problem, including:

solution 1: the multiple acknowledgements (ACK or NACK) are uniformly associated to multiple consecutive uplink subframes, for example, 4 of 8 acknowledgements are associated to uplink subframe m, and the remaining 4 acknowledgements are associated to the next subframe of uplink subframe m, uplink subframe m + 1.

Solution 2: and determining some special subframes, and uniformly associating a plurality of received responses to the special subframes and a plurality of continuous uplink subframes.

Solution 3: the association of the reception response with the uplink subframe is dynamically performed according to the number of the actual reception responses to be transmitted.

Furthermore, in designing HARQ timing for the shortened TTI of TDD, the inventors of the present disclosure found that special subframes should be handled carefully even with a TTI length of 0.5 ms. Therefore, in the disclosure of the present invention, a method for processing a special subframe is also provided:

the method comprises the following steps: the original 1ms special subframe is divided into two parts, i.e. S_DAnd S_UEach of which has a length of 0.5 ms. This option may be used for certain specific DwPTS/GP/UpPTS configurations (

configurations

7, 8 and 9).

The method 2 comprises the following steps: although the original 1ms uplink and downlink subframes are subdivided (e.g., shortened to 0.5ms or less each), the original 1ms special subframes are not subdivided.

The solution of HARQ timing proposed in the context can be used for both methods based on some assumptions.

The following detailed description of embodiments of the invention refers to the accompanying drawings.

Fig. 1a is a schematic diagram of a frame structure of an uplink/downlink configuration 2 using a TTI of 1 ms. FIG. 1b is a schematic diagram of a frame structure of an uplink/downlink configuration 2 using a TTI of 0.5ms according to an embodiment of the present invention; FIG. 1c is a simplified diagram of a frame structure of an uplink/downlink configuration 2 using a TTI of 0.5ms according to yet another embodiment of the present invention; fig. 1d is a schematic diagram of a special sub-frame before and after subdivision according to an embodiment of the invention.

In view of downward compatibility, there are two schemes available for shortening the TTI in TDD. A TTI of 1ms as shown in fig. 1a is subdivided in a different way into TTIs of shorter length (e.g. 0.5ms) in the two examples shown in fig. 2b and 2 c. The scheme shown in fig. 2b is referred to as a first partitioning scheme and the scheme shown in fig. 2c is referred to as a second partitioning scheme.

For the first division scheme, the uplink/downlink configuration is not changed, the relative position relationship between the new uplink subframe, the new downlink subframe and the special subframe is not changed, that is, the original D-S-U-D-D circulation mode is still the D-S-U-D-D circulation mode after division, but the length of each subframe is changed from the original 1ms to 0.5 ms. In this case, the previous HARQ timing scheme for the 1ms TTI may be simply reused if it can be assumed that the processing time of the eNB and UE may decrease linearly with the shortening of the TTI. The first division scheme has its disadvantages, for example, if used simultaneously with the conventional 1ms TTI (i.e., an environment where 1ms TTI and 0.5ms TTI exist simultaneously in the network) it may cause higher interference between uplink and downlink. Of course, the above-mentioned interference may be avoided by dynamic scheduling, e.g., not scheduling any legacy UEs (using 1ms TTI) on subframes used by UEs of short TTI, or not scheduling any UEs of short TTI on subframes used by legacy UEs.

For the second partitioning scheme, the existing downlink subframe D is divided into two new downlink subframes D, the existing uplink subframe is divided into two new uplink subframes, and in addition, the special subframes with a specific DwPTS/GP/UpPTS configuration (e.g.,

configurations

7, 8 and 9) may be divided into S_DAnd S_UFIG. 2d shows that the former part of the original DwPTS and GP is divided into new special sub-frames S_DThe original UpPTS and the latter part of GP are divided into a new special subframe S_U. The advantage of the second partitioning scheme is that it can coexist with the conventional 1ms TTI without causing high interference between uplink and downlink. For the second partitioning scheme, a new HARQ timing scheme is required.

Next, a specific example of a HARQ timing solution under the second partitioning scheme is introduced with reference to fig. 2a-2g, and fig. 2a-2g specifically show schematic diagrams of HARQ timing schemes for downlinks configuring 0-6 for uplink/downlink according to an embodiment of the present invention, wherein a subframe is shortened to 0.5ms according to the principle shown in fig. 1b, for example.

Before introducing the HARQ timing scheme applicable for the shortened TTI in TDD, some basic assumptions are laid down:

the basic assumption is that: the processing time of the eNB and UE may decrease linearly with decreasing TTI length, and the RTT may decrease accordingly.

Based on this assumption, the FDD system using 0.5ms TTI can still transmit the acknowledgement of reception of the data transmitted on subframe n (indicating whether the reception of subframe n is acknowledged, ACK indicating acknowledgement, NACK indicating unacknowledged) on subframe n +4, while the HARQ timing of the TDD system using 0.5ms TTI can be designed according to the following principle.

Basic principle of HARQ timing design of downlink after TDD shortened TTI

If the base station transmits a transport block in the downlink subframe n, the receiving user equipment will transmit a reception response to the transport block in the uplink subframe n + k, for example, ACK indicates acknowledgement (reception success) and NACK indicates non-acknowledgement (reception failure). The base station judges whether the transmission block needs to be retransmitted or the next downlink transmission block can be sent according to the judgment.

The value of k generally depends on the processing time of the receiving end, and this processing is, for example, the length of 3 subframes (for example, 1ms in one subframe, 3 ms). Due to the processing time, the sending and receiving response is delayed by 4 sub-frames, i.e., k is generally equal to or greater than 4. According to the aforementioned assumption, the processing delay is linearly shortened with the shortening of the TTI, and since the TTI is shortened from 1ms to 0.5ms, it can be considered that the processing delay is shortened from 3ms to 1.5 ms. It should be noted that if the processing capability of the receiving end is different from the above, the value of k may be adjusted accordingly, and the so-called minimum delay may be shortened or lengthened accordingly.

Based on the above basic principle, the downlink HARQ timing relationship of different uplink/downlink configurations is shown in the figure2a to 2g, and k.gtoreq.4 as an example. It should be noted that although k-4 already takes into account the processing time of the receiving side, i.e. even if k-4, the receiving side can complete the processing of the received transport block during this time and generate a corresponding reception acknowledgement. The corresponding reception acknowledgement is sent a little earlier, so that the base station can know the reception result a little earlier in order to arrange for the retransmission of the transport block or the next transport block in the transmission queue. From the viewpoint of reducing RTT, assuming that the transport block is transmitted on the subframe n, the RTT should be the shortest when the acknowledgement is transmitted in the first uplink subframe after the subframe n, and therefore, we refer to the interval between the subframe n and the first uplink subframe after the subframe n as the minimum delay. Here, the special subframe S_dIs used for PDCCH and Physical Hybrid-ARQ Indicator Channel (PHICH) transmission at the same time, and a special subframe S_uIs not used for PUSCH transmission due to its very short duration, instead S_uMay be left blank as an extra guard period or may be used for channel sounding or random access.

In fig. 2a-2g, the curve with arrows connects the downlink sub-frame D for transmitting the downlink transport block_xAnd an uplink subframe U for transmitting a reception response of the downlink transport block_yIn addition, when the special subframe S_dFor transmission, corresponding uplink subframes for sending and receiving acknowledgement are also allocated and connected by a curve with arrows, e.g. the special subframe S in fig. 2a_d2(special subframe No. 2) and U₆(uplink subframe No. 6).

The HARQ timing schemes for different TDD configurations according to the HARQ timing association in fig. 2a-2g are summarized in table 2. Wherein, for the transport block transmitted in each TTI in each uplink/downlink configuration, it is shown how many TTIs the receiving side will provide the corresponding reception acknowledgement.

TABLE 2 example HARQ timing schemes for different TDD uplink/downlink configurations

From FIG. 2a-2g, there are more consecutive downlink subframes in some downlink partial reconfiguration (e.g.,

configurations

2, 3, 4, and 5 shown in fig. 2c-2 f). According to the aforementioned rule beneficial to shorten RTT, these downlink subframes all need to get the acknowledgement of reception in the first uplink subframe (e.g. U in fig. 2 c)₁₄U on the right side of FIG. 2d₄U on the right side in FIG. 2e₄). In this case, if multiplexing is used, the UE needs to send many bits, which will significantly limit the uplink coverage; whereas if bonding is used, the number of unnecessary retransmissions will increase significantly. Therefore, HARQ timing for these downlink partial reconfigurations may need to be further improved.

To solve the above problem, according to the embodiments of the present disclosure, a solution is proposed, which is mainly applied to the situation where the TTI is further shortened, for example, from 1ms to 0.5ms or even shorter, and it is desired to eliminate the following adverse effects on the premise of achieving shorter waiting time. The basic idea of these embodiments is that the receiving side of the radio communication (user equipment for downlink data transmission and base station for uplink data transmission) does not send a reception acknowledgement for at least one transport block with a minimum delay after receiving the transport block. For example, for a transport block transmitted by the base station on subframe n, if there is one uplink subframe (n +4) after subframe n by 4 subframes, the minimum delay is 4, and not transmitting the acknowledgement of reception with the minimum delay means that if uplink subframe n +4 is followed by other uplink subframes (e.g., n +5 or even n +6) connected thereto, the acknowledgement of reception of subframe n can be placed on uplink subframe n +5 or even n + 6. Specifically, since the type (uplink, downlink, special subframe) of each subframe in each uplink/downlink configuration is relatively fixed, it may be configured in advance on which subframe the transport block on each subframe should provide the received response, where it may be avoided that some subframes carry too many tasks for receiving the response by "not sending the received response for at least one transport block with the minimum delay".

The basic idea of the foregoing has various implementation manners, and the following description respectively takes the base station as a sending party to send downlink data, and the user equipment as a receiving party to provide a receive response as an example:

example 1: and allocating a plurality of received responses to be transmitted to a plurality of continuous uplink subframes substantially equally.

In this case, the number of reception acknowledgements that need to be transmitted in one uplink subframe linearly decreases. Fig. 3a to 3d are schematic diagrams of downlink HARQ timings of uplink/

downlink configurations

2, 3, 4, and 5 according to embodiment 1 of the present invention.

See FIG. 3a, wherein D₆-D₁₁For 6 consecutive downlink subframes, U14 is the first uplink subframe after them. S_d2As a downlink special subframe, the downlink transmission is also assumed, and the subsequent U4 and U5 are too close to Sd2 to meet the requirement of the processing time of the receiving party, so that U14 becomes the first available uplink subframe after Sd2 (accordingly, for Sd2, the minimum time delay for obtaining the response is the time interval between it and U14, i.e. 12 subframes). Up to this point, the user equipment needs to provide a reception acknowledgement for 7 subframes of Sd2, D6-D11. Without loss of generality, according to fig. 3a, such an allocation may be made that three downlink subframes Sd2, D6, D7 are acknowledged at U14, and four subframes D8-D11 are acknowledged at U15. It can be seen that, through the above-mentioned substantially average allocation, Sd2, D6, and D7 all receive acknowledgements with minimum latency, while the first available uplink subframe (with an interval greater than the processing time required by the receiving party, e.g. 3 subframes) after D8, D9, and D10 is U14, but the acknowledgement is obtained only at U15, so the input does not obtain the acknowledgement with minimum latency, which embodies the above-mentioned principle.

Similarly, for D16-D19, the acknowledgements are obtained at U4 and U5, respectively, while D18-D19 do not provide the acknowledgement at the first available uplink subframe U4, and therefore do not provide the acknowledgement with the minimum delay.

As for D0 and D1, there are U4 and U5 behind it and the processing time requirement of the receiving party can be met, so D0 gets a response at U4 and D1 gets a response at U5.

A variation of the above example is that the acknowledgements may also be distributed in other proportions in the uplink subframes, rather than being relatively strictly equally divided.

Since the HARQ timing relationship is repeated periodically in one radio frame (10ms), in the drawings disclosed in the present invention, the timing relationship on each subframe in one radio frame (20 TTIs of 0.5ms) is generally shown, and those skilled in the art can directly deduce other timing relationships not shown according to the drawing.

It can be understood that for uplink transmission, when there are more consecutive uplink subframes, the first available downlink subframe after the uplink subframes may also face the problem of needing to provide the ue with reception acknowledgement for too many uplink subframes. For this purpose, the receiving and responding tasks of the uplink subframes may be substantially equally distributed to a plurality of consecutive downlink subframes, and at least one uplink subframe may not obtain the receiving and responding of the base station with the minimum delay.

Referring to fig. 3b-3d, similar processing in the uplink/downlink configurations 3-5 is also shown, respectively, and will not be described again.

Example 2: in the embodiment 1 shown in fig. 3a to 3d, there may be some uplink subframes carrying more tasks for sending the received acknowledgements, for example, the right-hand U4 and U5 shown in fig. 3d correspond to 8 downlink subframes, respectively. In order to further reduce the number of corresponding/associated downlink subframes required for a single subframe, it is proposed according to embodiment 2 to couple a special subframe S_uAnd also for sending a receipt acknowledgement. Referring to fig. 4, fig. 4 is a schematic diagram of further improved downlink HARQ timing of the uplink/downlink configuration 5 according to embodiment 2 of the present invention.

As shown in fig. 4, Sd2 and D6-D19 have 15 subframes in total, and if the example shown in fig. 3D is used, it is necessary to provide the reception acknowledgement of 8 subframes in total, Sd2 and D6-D12, using U4, and 7 subframes in total, D13-D19, using U5.

According to the example of fig. 4, however, Su3 is also used to transmit the reception acknowledgement, 15 subframes of Sd2, D6-D19 are equally allocated to Su3, U4 and U5, wherein the reception acknowledgement is not transmitted with minimum delay for the subframe allocated to U4 and U5 because Sd2 is the first available subframe after Sd2, D6-D19.

In embodiment 2, the special sub-frame Su is used for sending the reception response, and there are two following implementation manners in specific applications:

mode 1-3GPP explicitly specifies the special subframe for sending the reception response and establishes the HARQ timing scheme as shown in fig. 4, which is pre-stored at the base station and the ue, can be invoked when a specific uplink/downlink configuration is activated, and is based on the pre-defined special subframe S_uAnd sending a receiving response on the corresponding special subframe according to the corresponding relation between the special subframe and the downlink subframe. For example, as shown in fig. 4.

Mode 2-whether a special subframe is used for sending a reception acknowledgement is determined quasi-statically or dynamically by the base station and informs the user equipment.

Mode 2 can be flexibly used in combination with embodiment 1. E.g. eNB according to S_uWhether a subframe is available for transmission of a reception acknowledgement configures a HARD timing scheme. For example, if in some special cases, S_uThe subframe cannot be used for transmitting a reception response, the association relationship defined in embodiment 1 may be adopted. On the other hand, if S_uThe subframe may be used for transmission of a reception response, by which the association defined as described above in embodiment 2 is adopted. To implement embodiment 2, a configuration message may be defined for 3GPP so that the base station explicitly informs the UE how to transmit the reception response. For example, the base station should inform the UE which HARQ process acknowledgements received may be sent on the special subframe. And from the UE's perspective, if no such configuration message is received, the UE will follow the association of HARQ timing as defined in embodiment 1. If the configuration information is received, the UE should understand to take action according to the present configuration indication. That is, for approach 2, a new time association table may be defined that is different from that of embodiment 1 (e.g., as shown in fig. 3a-3 d).

Example 3: dynamically defining the HARQ timing scheme based on the number of acknowledgements received that need to be provided for an acknowledgement

In contrast, the solutions of

embodiments

1 and 2 are static, wherein, according to a static definition in advance, the eNB and the UE clearly predict how to perform the sending of the reception acknowledgement, i.e. on which subframe the transmission of which subframes should be acknowledged.

The solutions of examples 1-2 are certainly possible, and of course, further improvements may be possible. Reference is made to fig. 5a-5b, which are schematic illustrations of a further improved downlink HARQ timing for an uplink/downlink configuration 5, according to an embodiment of the present invention.

This is because, in some cases, there may be some downlink subframes where no downlink data is transmitted. For these downlink subframes with no data transmission, it is not necessary to provide them with reception acknowledgements. In other words, these downlink subframes and uplink subframes or S for transmitting reception responses thereto_uThe association between subframes may be temporarily cancelled. The freed up uplink transmission capability, such as special subframes and some uplink subframes, may then be released for other uses. In this case, there may be preferred examples of such as a released uplink subframe or special subframe S_uCan be used for sending the receiving response for other downlink subframes, and the receiving response of the downlink subframes originally needs to be at the later uplink subframe or special subframe S_uThe method can lead the sending of the corresponding receiving response to be advanced, is beneficial to improving the quick feedback and reducing the transmission delay.

According to an example, the term "dynamic" herein refers to that even for a specific uplink/downlink configuration, a downlink subframe is associated with an uplink subframe or a special subframe S for transmitting a reception response thereto_uThe inter-HARQ timing association may vary depending on the number of acknowledgements to be transmitted. For example:

"if there is downlink data to be transmitted in all downlink subframes, the HARQ timing association may be determined as a predefined static scheme (as in, for example, embodiment 1 or 2).

"if there are some downlink subframes without data transmission, these downlink subframes determined in the static scheme and the uplink subframes or special subframes for sending the reception response theretoFrame S_uThe relationship of the relationship between them can be temporarily broken. In this case, the eNB will adjust the downlink subframe and uplink subframe or S according to the specific uplink/downlink configuration and the number of reception responses that need to be sent_uAnd then informs the UE of the newly determined association for HARQ processing.

As shown in fig. 5a-5b, if all downlink subframes need to transmit downlink data, the corresponding relationship between the downlink subframes and the subframes for transmitting the reception response may be as shown in fig. 4. If there are some downlink subframes without data transmission,

e.g. downlink subframes

6, 7, 8 and 9 as shown in fig. 5a, these downlink subframes are originally associated with special subframe S as shown_u3The association between them is broken and S_u3Can be used for associating with other downlink subframes, as shown in fig. 5b, associating with D10-D12, so that the time for D10-D12 to get the response is advanced by one subframe, i.e. the waiting time from the original 14, 13, 12 subframes respectively is shortened to only requiring 13, 12 and 11 subframes. The feasibility of the above adjustment comes from the eNB knowing which downlink subframes are to transmit data and which downlink subframes are not to transmit downlink data. Once the eNB has re-determined the HARQ timing association as shown in fig. 5b, the UE may be informed of the new correspondence for the respective HARQ process.

Next, the processing of the original special subframe in the context of the shortened TTI will be briefly described.

As mentioned above, only special subframes according to special configuration, i.e. those with special DwPTS/GP/UpPTS configuration (

configurations

7, 8, and 9), can be divided into Sd and Su as described above, as shown in fig. 6. While special subframes with other DwPTS/GP/UpPTS configurations (configuration 0-6) do not fit the TTI of 0.5ms well. For the special subframe with DwPTS/GP/UpPTS configuration of 0-6, the proposal can continuously keep the current length of 1ms in the scene of shortened TTI, even if the lengths of all downlink subframes and uplink subframes are reduced to 0.5ms or even shorter. Furthermore, although the length of these special subframes does not change, the contents can be modified according to the requirement of TTI shortening.

Fig. 6 shows an HARQ timing scheme of an uplink/downlink configuration 2 when a special subframe is maintained for 1 ms. Of course, it is also possible to further refer to the description in embodiment 1-2, and a part of the reception acknowledgements in, for example, U14 and U4 are instead transmitted by, for example, U15 and U5.

In the above, the discussion of the static downlink HARQ timing solution in the case of a shortened TTI for a TDD system is mainly addressed. For static solutions, the HARQ timing association is determined by a predetermined association table (e.g. table 10.1.3.1-1 for downlink as defined in 3gpp ts 36.213). The UE realizes the association relation of the HARQ process defined by the configured uplink/downlink configuration. An advantage of this type of solution is that the complexity is low for the current TTI length of 1ms and seven existing uplink/downlink configurations. However, considering the shorter TTI required for shortening the waiting time, the association relationship tends to become more complex to support HARQ timing of different uplink/downlink configurations and different TTI lengths. The complexity becomes much higher if elma and Carrier Aggregation (CA) are used with TTI shortening. In addition, the static solution cannot flexibly consider the influence of other factors, such as service type, traffic load, deployment environment, and interference situation, and for this reason, a dynamic configuration scheme for HARQ timing is proposed to cope with the need of shortened TTI in TDD.

In this dynamic mechanism, the HARQ timing association is determined by the eNB according to any of the following: uplink/downlink configuration, TTI length, service type, traffic load, interference situation, etc. The determined HARQ timing association, or the correspondence between the time unit in which the transport block is transmitted and the time unit for providing the reception acknowledgement for it, is then signaled to the UE via defined signaling. When the UE receives the determined HARQ timing association from the eNB, the HARQ process may be performed accordingly.

In particular, this way of dynamic determination can be made by:

1: a plurality of association relation tables of HARQ timing are predefined, wherein uplink/downlink configuration and other influencing factors are considered. Both the UE and the base station are aware of these tables. The base station selects an association from the uplink/downlink configurations, TTI length, and other factors, and sends a message to the UE informing of the selection. According to different examples, this notification should be sufficient for the UE to know which specific association should be applied. For example, the index number of the table is included, as well as the index number of the specific association in the particular table.

2: the association table may not be defined in advance. Instead, the association of HARQ timing is determined entirely by the eNB based on the uplink/downlink configuration, TTI length, and any other factors that need to be considered. Once determined, it will be signaled to the UE for the HARQ process. The content of the signaling may include an association relationship between a downlink subframe and an uplink subframe (special subframe) for which a reception response is transmitted, and a specific HARQ process index. In this option, the association of HARQ timing may have to be determined by the eNB and informed to the UE, since no default mode is available for the UE.

Unlike the static solution, the dynamic solution has a higher flexibility in the configuration of HARQ timing. In view of the shortened TTI, it may be possible to support dynamic switching between different TTI lengths in order to reduce latency even for the same UE. In this case, it is necessary to use a more flexible HARQ timing configuration mechanism, although the signaling overhead may increase accordingly.

Next, HARQ timing for TDD with TTI length shortened to less than 0.5ms is briefly discussed. The inventors of the present disclosure consider that there are at least the following three schemes to cope with the situation where the TTI length is less than 0.5ms according to the idea of the present invention.

One, similar to that shown in fig. 1b, the uplink/downlink configuration is not substantially changed, and simply shortens the TTI length to less than 0.5 ms. Thus, strong interference may be formed when coexisting with a UE of a conventional TTI of 1 ms.

Similarly, as shown in fig. 1c, the current 1ms downlink subframe is divided into a plurality of new downlink subframes less than 0.5ms, while the current 1ms uplink subframe is divided into a plurality of new uplink subframes less than 0.5ms, and the current special subframe is divided into a plurality of new special subframes less than 0.5 ms. This scheme can coexist with the conventional 1ms TTI without generating high interference.

Third, in order to further reduce the waiting time, a new uplink/downlink configuration different from the existing uplink/downlink configuration may be defined. Then, when analyzing the new structure, possible interference with legacy UEs should be considered and the special subframes should be carefully designed.

Fig. 7 is a flowchart of a method for providing a reception response to a sender by a receiver of a time division duplex-based wireless communication with the aid of a base station according to an embodiment of the present invention. Since the details have been discussed in detail above, only the points are briefly described here.

Referring to fig. 7, in step S102, the base station 1 determines a correspondence relationship between a plurality of reception responses (in response to a plurality of downlink transport blocks sent by the base station before) of a receiving side (e.g., the user equipment 2) and a transmission time unit (e.g., an uplink subframe) for transmitting the reception responses, wherein the correspondence relationship is such that the UE2 does not transmit at least one of the reception responses with a minimum time delay, for example, refer to the previous figures and the related description.

In step S104, the base station 1 provides the determined correspondence to the UE2 (as the receiving side of the downlink transport block).

In step S202, the user equipment 2 allocates a plurality of reception acknowledgements to a plurality of adjacent transmission time units (e.g. uplink subframes), wherein at least one reception acknowledgement will not be transmitted with a minimum delay.

In step S204, the user equipment 2 transmits a corresponding reception response at each transmission time unit.

Specifically, as described above, the user equipment 2 may find out which downlink subframes should be used to send the reception response of each uplink subframe according to the correspondence statically stored in advance, so in some examples, steps S102 and S104 are optional. However, in each of the dynamic scenarios previously described, steps S102-S104 may preferably be retained.

According to one embodiment, the allocation in step S202 is such that the acknowledgements are allocated substantially equally over a plurality of consecutive (adjacent) uplink subframes, and the acknowledgements correspond to a previous plurality of consecutive downlink subframes for which the acknowledgements are provided.

The details of the above and other features of the steps can be seen with reference to the detailed description made above in connection with other figures.

Fig. 8 is a schematic block diagram of an answering machine 8 for providing a receiving answer to a sender by a receiving side of time division duplex based wireless communication according to an embodiment of the present invention.

Wherein the acknowledgement means 8, which provides the acknowledgement of receipt for the sender on the basis of the receiver of the time division duplex-based wireless communication, is configured not to transmit at least one acknowledgement of receipt with a minimum delay.

Further, the answering device 8 comprises:

an assigning module 802 configured to assign a plurality of received acknowledgements to a plurality of transmission time units, wherein at least one of the received acknowledgements is not transmitted with a minimum delay;

a transmitting module 804 configured to transmit the corresponding reception acknowledgement within the allocated transmission time unit.

Specifically, the plurality of acknowledgements corresponds to a plurality of consecutive receive time units (e.g., a plurality of downlink subframes for the UE2), and the allocation module 802 is further configured to substantially evenly allocate the plurality of acknowledgements to a plurality of adjacent transmit time units (e.g., a plurality of uplink subframes).

Specifically, the plurality of transmission time units for transmitting the reception acknowledgement include an uplink subframe and a special subframe.

Specifically, the base station 1 (sender) and the UE2 (receiver) employ a shortened Transmission Time Interval (TTI), e.g., shorter than the existing 1ms, e.g., 0.5 ms. The answering device 8 may then further comprise a sub-frame dividing module 806 configured to divide the atomic frame into a plurality of new sub-frames such that:

the relative sequence relation of an uplink subframe, a downlink subframe and a special subframe in the new divided subframe is the same as that before the division; or

Each original uplink subframe is divided into a plurality of new uplink subframes, each original downlink subframe is divided into a plurality of new downlink subframes, and the original special subframes are not subdivided; or

Each original uplink subframe is divided into a plurality of new uplink subframes, each original downlink subframe is divided into a plurality of new downlink subframes, and each original special subframe is divided into a plurality of new special subframes.

Specifically, the transponder 8 may further include:

an obtaining module 808 configured to obtain (from the base station 1) an updated time cell correspondence indicating which transmission time cell the reception response of each reception time cell (downlink subframe to the UE2) is transmitted by, wherein the time cell correspondence is determined according to the load information of each reception time cell;

the allocating means 802 is further configured to obtain load information of a plurality of receiving time units according to the obtained updated correspondence.

Fig. 9 is a schematic block diagram of an auxiliary apparatus 9 for assisting a receiving side of wireless communication to complete a reception response to a transmitting side in a wireless communication base station based on time division duplex according to an embodiment of the present invention.

The auxiliary device 9 for assisting a receiving side of wireless communication to complete a reception response to a transmitting side in the wireless communication base station based on time division duplex includes:

a determining device 902 configured to determine a plurality of reception responses of the receiving party (e.g. the UE2) and a transmission time unit (e.g. an uplink subframe, or an uplink subframe and a special subframe S) for transmitting the plurality of reception responses_u) Wherein the correspondence is such that the receiver does not transmit at least one of the reception acknowledgements with the minimum delay;

providing means 904 configured to provide the determined correspondence to the recipient.

Further, a judging device 906 configured to judge whether there is wireless communication from the sender on each receiving time unit of the receiver may be further included;

the determining means 902 is further configured to determine, according to a determination result of the determining means, a correspondence relationship between a plurality of reception responses of the receiving side and a transmission time unit for transmitting the plurality of reception responses.

Further, the determining means 902 is further configured to determine the correspondence according to any of the following: uplink/downlink configuration, time length of transmission block, service type, traffic load, interference situation.

It is noted that the present invention may be implemented in software and/or in a combination of software and hardware, for example, the various means of the invention may be implemented using Application Specific Integrated Circuits (ASICs) or any other similar hardware devices. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Further, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

While exemplary embodiments have been particularly shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the claims. The protection sought herein is as set forth in the claims below.

Claims

1. An acknowledgement device for providing a reception acknowledgement to a sender by a receiver of a wireless communication based on time division duplex, characterized in that at least one reception acknowledgement is not transmitted with a minimum delay;

wherein the answering device comprises:

the distribution module is configured to distribute a plurality of receiving responses to be sent to a plurality of sending time units, wherein at least one receiving response is not sent with the minimum time delay;

a transmitting module configured to transmit a corresponding reception response within each allocated transmission time unit;

wherein, HARQ timing association relation between the downlink sub-frame and the uplink sub-frame or the special sub-frame for transmitting the receiving response is changed according to the number of the receiving response to be transmitted.

2. The responder device of claim 1, wherein the plurality of receive acknowledgements correspond to a plurality of consecutive receive time units,

the allocation module is further configured to evenly allocate the plurality of receive acknowledgements to a plurality of adjacent transmit time units.

3. The transponder apparatus of claim 1,

the receiving party is user equipment, the sending party is a base station, and the plurality of sending time units comprise uplink subframes and special subframes.

4. Answering device according to claim 3, wherein the sender and receiver employ a shortened transmission time interval,

the responding device further comprises a sub-frame dividing module configured to divide the atomic frame into a plurality of new sub-frames such that:

5. The transponder of any one of claims 2-4, further comprising:

an obtaining module configured to obtain an updated time unit correspondence, where the updated time unit correspondence indicates which transmission time unit the reception response of each reception time unit is transmitted by, and is determined according to load information of each reception time unit;

the allocating means is further configured to allocate the plurality of reception responses to the plurality of transmission time units according to the obtained updated correspondence.

6. A wireless based communication device, characterized in that it comprises a transponder device according to any one of claims 1-5.

7. An apparatus for assisting a receiving side of wireless communication to complete a reception response to a transmitting side in a wireless communication base station based on time division duplex, comprising:

a determining device configured to determine a correspondence between a plurality of reception responses that the receiving party needs to send and a plurality of sending time units for sending the plurality of reception responses, wherein the correspondence is such that the receiving party does not send at least one of the reception responses with a minimum time delay;

providing means configured to provide the determined correspondence to the recipient;

8. The assistance device according to claim 7, further comprising:

a judging means configured to judge whether there is wireless communication from the sender on each reception time unit of the receiver;

the determining device is further configured to determine, according to a determination result of the determining device, a correspondence between a plurality of reception responses that the receiving side needs to transmit and a plurality of transmission time units for transmitting the plurality of reception responses.

9. An auxiliary device according to claim 7, wherein the determining means is configured to determine the correspondence in dependence on any of:

uplink/downlink configuration, time length of transmission block, service type, traffic load, interference situation.

10. A wireless communication base station, characterized in that it comprises the assistance device of any one of claims 7 to 9.

11. A method for a receiver of a time division duplex based wireless communication to provide a reception acknowledgement to a sender, characterized in that the receiver does not send at least one reception acknowledgement with a minimum delay;

wherein, the method comprises the following steps:

allocating a plurality of received responses to be transmitted to a plurality of transmission time units, wherein at least one received response is not transmitted with a minimum delay;

transmitting corresponding receiving responses in each allocated transmission time unit;

12. The method of claim 11, comprising the steps of:

the method includes uniformly distributing a plurality of reception acknowledgements to a plurality of adjacent transmission time units, wherein the plurality of reception acknowledgements correspond to a plurality of consecutive reception time units.

13. The method according to claim 11 or 12, wherein the sender is a base station, and the plurality of transmission time units comprise uplink subframes and special subframes.

14. A method for assisting a receiving side of wireless communication to complete a reception response to a transmitting side in a wireless communication base station based on time division duplex, comprising the steps of:

determining a corresponding relation between a plurality of receiving responses required to be sent by the receiving party and a plurality of sending time units used for sending the plurality of receiving responses, wherein the corresponding relation enables the receiving party not to send at least one of the receiving responses with the minimum time delay;

providing the determined correspondence to the recipient;