TW201540010A - Methods and apparatuses for UL transmission feedback for MTC UE - Google Patents

Abstract

The present disclosure provides methods and apparatuses for UL transmission feedback for a . A method includes constructing DCI information specific for the MTC UE, the DCI information including at least ACK or NACK information for the UL transmission of the MTC UE; and broadcasting the DCI information to all UEs served by the base station.

Description

Method and apparatus for uplink transmission feedback for machine type communication (MTC) user equipment (UE)

The present invention relates generally to the field of wireless communications and, more particularly, to a method and apparatus for uplink transmission feedback for an MTC UE.

Machine to Machine (M2M) communication, also known as Machine Type Communications (MTC), is a mode of communication between machines and machines. It has been widely used in smart transportation, remote charging, and remote Monitoring and other fields. A machine (device) participating in M2M communication is also referred to as an MTC User Equipment (UE).

In the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the Physical Downlink Control Channel (PDCCH) is carried for one or more depending on the scope. Downlink Control Information (DCI) of UEs. PDCCH and physical downlink shared channel for transmitting downlink data (Physical Downlink Shared Channel, PDSCH) Time division multiplexing. The UE performs a blind check in the PDCCH control region to search for whether there is a PDCCH transmitted for it. The blind detection uses the corresponding Radio Network Temporary Identity (RNTI) of the UE to perform a decoding attempt on the PDCCH. If the decoding is correct, the DCI for the UE is received, and then the corresponding message is received in the PDSCH.

As a work item in 3GPP, currently, research is being conducted to increase the coverage of MTC UEs by 15 dB to bring more commercial benefits to MTC suppliers and operators. All physical channels need to be enhanced based on MCL calculations. In order to achieve this goal, repeated transmissions in the time domain are considered to be an important method. According to recent simulation results, repeated launches are required hundreds of times to meet the most demanding requirements. As a result, the spectral efficiency of MTC UEs operating in the Coverage Extension (CE) mode is a concern. In order to ensure the efficiency of the MTC UE, it is desirable to be able to maintain the hybrid automatic repeat (HARQ) function, since only using the radio link control (RLC) layer ARQ helps little for the coverage hole for the MTC UE.

For the downlink transmission, the Physical Uplink Control Channel (PUCCH) is still used to feed back the positive acknowledgment/negative acknowledgment (ACK/NACK), but the HARQ mechanism for the uplink transmission still has not reached an agreement.

For the HARQ of uplink transmission, a proposed scheme is to directly transmit the physical hybrid automatic retransmission indication channel (Physical). Hybrid ARQ Indicator Channel, PHICH), this method will generate an eNB scheduler problem because: (1) there is a resource conflict between the feedback of the normal UE (no repetition) and the feedback of the MTC UE (with repetition), due to the eNB scheduling The device needs to try to avoid such a collision, so the eNB flexibility is reduced; (2) since the PHICH index is bound to the lowest resource block (RB) index of the physical uplink shared channel (PUSCH), this generates some for the eNB scheduler. Limit and make it more difficult to avoid conflicts.

Therefore, these constraints on the configuration of uplink resources reduce scheduling flexibility and spectral efficiency is also adversely affected as multi-user diversity is reduced. In addition, the eNB needs to perform very complex scheduling, ie, it will increase the scheduling complexity of the eNB.

In addition to the scheduling problem, this scheme has the following problems: (1) When the uplink of the PUSCH of the MTC UE is repeatedly hopped, the relationship between the PHICH index and the PUSCH RB index is still unclear (2) To reduce complexity, 3GPP typically minimizes the number of channels that need to be enhanced, and repetition of the PHICH will require additional rules to enhance the PHICH.

Although some companies, such as MediaTek Inc. and Intel Corp., consider this direct repeat PHICH solution to be beneficial and effective, most companies hold the above for this option. The point of view is that it is not a satisfactory solution.

Another suggested solution is to use the UL authorization as a feedback to indicate ACK/NACK. However, this approach is not efficient enough because it consumes about 10 times more resources than the repeated PHICH scheme.

Therefore, considering how many times the number of repetitions of the UL grant of the CE-MTC UE and the capacity of the PDCCH are limited, how to efficiently transmit the ACK/NACK feedback for its uplink transmission in the compressed format becomes a technical problem to be solved.

In view of the above problems, the present invention proposes an effective scheme for uplink transmission feedback for an MTC UE.

According to a first aspect of the present invention, a method for uplink transmission feedback for an MTC UE in a base station is provided, comprising: constructing DCI information dedicated to an MTC UE, the DCI information including at least the MTC ACK or NACK information of the uplink transmission of the UE; broadcasting the DCI information to all UEs served by the base station.

According to a second aspect of the present invention, there is provided an apparatus for uplink transmission feedback for an MTC UE in a base station, comprising: a DCI construction unit for constructing DCI information dedicated to an MTC UE, the DCI information The at least ACK or NACK information for the uplink transmission of the MTC UE is included; and the sending unit is configured to broadcast the DCI information to all UEs served by the base station.

According to a third aspect of the present invention, a method for performing uplink transmission feedback for an MTC UE in a base station includes: constructing DCI information dedicated to an MTC UE, the DCI information including a first sequence or Different from the second sequence of the first sequence, where the first sequence is used for ACKing an uplink transmission of the MTC UE, and the second sequence is used by Performing NACK on the uplink transmission of the MTC UE; using the RNTI of the MTC UE to perform the codec on the DCI information; and broadcasting the coded DCI information to all UEs served by the base station.

According to a fourth aspect of the present invention, an apparatus for uplink transmission feedback for an MTC UE in a base station is provided, comprising: a DCI construction unit, configured to construct DCI information dedicated to an MTC UE, the DCI information A first sequence or a second sequence different from the first sequence, wherein the first sequence is used for ACKing an uplink transmission of the MTC UE, and the second sequence is used for an uplink of the MTC UE The transmission is performed with a NACK; the codec unit is configured to perform the codec on the DCI information by using the RNTI of the MTC UE; and the sending unit is configured to broadcast the coded DCI information to all UEs served by the base station.

According to a fifth aspect of the present invention, a method for receiving uplink transmission feedback from a base station in an MTC UE, comprising: receiving a PDCCH broadcast by the base station; using the RNTI of the MTC UE Decoding the PDCCH to obtain DCI information dedicated to the MTC UE; correlating the DCI information by using the first sequence and the second sequence to determine whether the DCI information includes an ACK for uplink transmission of the MTC UE Or NACK information.

According to a sixth aspect of the present invention, an apparatus for receiving an uplink transmission feedback from a base station in an MTC UE, comprising: a receiving unit, configured to receive a PDCCH broadcast by the base station; and a de-mixing unit And using the RNTI of the MTC UE to de-mix the PDCCH to obtain DCI information dedicated to the MTC UE; The element is configured to correlate the DCI information by using the first sequence and the second sequence to determine whether the DCI information includes ACK or NACK information for an uplink transmission of the MTC UE.

100‧‧‧Wireless communication network

110‧‧‧Base Station

120, 122, 124, 126‧‧‧ User Equipment (UE)

400‧‧‧ device

410‧‧‧DCI building unit

420‧‧‧Send unit

700‧‧‧ device

710‧‧‧DCI building unit

720‧‧‧mixing unit

730‧‧‧Send unit

800‧‧‧ device

810‧‧‧ receiving unit

820‧‧‧Unmixing unit

830‧‧‧Related units

The invention will be better understood, and the other objects, details, features and advantages of the present invention will become more apparent from the description of the appended claims. In the drawings: FIG. 1 shows a schematic diagram of an exemplary network deployment for implementing the present invention; FIG. 2 shows a schematic diagram of a DCI format according to an embodiment of the present invention; FIG. 3 shows an implementation according to the present invention. A flowchart of a method for performing uplink transmission feedback for an MTC UE in a mode; FIG. 4 is a block diagram showing an apparatus for performing uplink transmission feedback for an MTC UE in a base station according to an embodiment of the present invention; A flow chart of performing PDCCH processing on the base station side in the prior art; FIG. 6 is a flowchart showing another method for performing uplink transmission feedback for an MTC UE according to an embodiment of the present invention; A block diagram of an apparatus for uplink transmission feedback for an MTC UE in a base station; and FIG. 8 illustrates a method for receiving from a base station in an MTC UE A block diagram of an apparatus for uplink transmission feedback.

Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the invention has been shown and described with reference to the embodiments Rather, these embodiments are provided so that this disclosure will be thorough and complete.

FIG. 1 shows a schematic diagram of an exemplary network deployment for implementing the present invention. As shown in FIG. 1, in wireless communication network 100, one (or more) base stations 110 and one or more UEs 120, 122, 124, and 126 are included. Among them, the base station 110 provides services for the UEs 120, 122, 124, and 126. In the following description, description is made by taking UEs 120 and 126 as MTC UEs, and UEs 122 and 124 as normal UEs (ie, non-MTC UEs) as an example. More specifically, the scheme of the present invention is described in detail in the following description taking the MTC UE 120 as an example. However, those skilled in the art can understand that the present invention is not limited thereto, but can be applied to the case where any multiple UEs are used as MTC UEs and applied to any MTC UE.

Here, the MTC UE may, for example, be located in a building with poor wireless coverage, and therefore it is desirable to be able to enhance coverage. However, those skilled in the art can understand that the present invention is not limited thereto, but can be applied to an MTC UE located at an arbitrary position.

The basic idea of the present invention is to design a DCI resource dedicated to the MTC UE. The format is used to feed back its uplink transmissions.

UL licenses require dozens of original bits, most of which are schedule information. However, the MTC UE does not require all of the scheduled content, so the DCI format for it can be compressed, leaving only the necessary information and optional other information.

Under this idea, depending on the specific application scenario, there are two main design options:

Option 1: DCI information with retransmission scheduling and redundancy version (RV) control

In this scheme, DCI information dedicated to the MTC UE is constructed for carrying feedback on the uplink transmission of the MTC UE.

In a specific implementation, the newly constructed DCI information is different from any of the existing DCI formats. The length of the DCI information is different from the existing DCI format, so the MTC UE receiving the DCI information can recognize it as carrying ACK/NACK information. In this implementation, since the number of DCI formats is increased, the workload of blind detection at the UE side will be slightly increased.

In another specific implementation, the format of the newly constructed DCI information is a DCI format that has never been applied to an MTC UE before. For example, the length of the newly constructed DCI information may be set to any one of DCI format 1D, DCI format 2, DCI format 2A, DCI format 2B, DCI format 2C, or DCI format 4. In this implementation, since only the existing DCI format is reused, the workload of blind detection at the UE side will not be increased.

The newly constructed DCI format contains only the domains required by the MTC UE, and other unneeded domains will be omitted.

Depending on the situation, the newly constructed DCI format may include, but is not limited to, some or all of the following fields: ACK/NACK information: ACK or NACK for indicating uplink transmission to the MTC UE. This field is mandatory and usually requires 1 bit.

Retransmission schedule information: used to indicate to the MTC UE the physical resource block (PRB) information and/or modulation coding scheme used for uplink retransmission when the NACK information is included in the ACK/NACK domain (Modulation and Coding Scheme, MCS) information.

In some cases, the base station may wish the uplink retransmission to be performed using a different PRB and/or MCS than the original transmission. In this case, the retransmission schedule field is used to inform the UE of the PRB and/or MCS for its retransmission. Its length depends on the bandwidth, usually around 10 bits. When the bandwidth is fixed, the length of the field is fixed. This field is optional.

Redundancy Version (RV) Information: In most cases, retransmitted RV information is predetermined and RV control is no longer needed. However, in some cases, the eNB may require the MTC UE to retransmit using the specified RV. For example, when the base station considers that the MTC UE loses its original UL grant, it may wish that the MTC UE retransmits the original data block instead of retransmitting according to the original RV. In this case, the RV information field in the DCI information is used to inform the UE of the RV information used for uplink retransmission. This field is optional and is usually 2 bits.

In this scheme, only the ACK/NACK information field is mandatory, and the other two fields are optional. The ACK/NACK information field and the possible retransmission schedule information field and the RV information field constitute the original information bits in the DCI information, so the length of the original information bit of the DCI information is not fixed, but the final DCI The information is fixed in length. In order to enable the MTC UE to obtain the original information bit, a complete DCI format as shown in FIG. 2 can be designed.

As shown in FIG. 2, the entire DCI format includes three parts: a DCI header: a bit map of n-1 bits can be used as a DCI header to indicate which fields exist in the original information bits, wherein n is the number of domains present in the original information bits in different embodiments.

For example, in one embodiment, only the ACK/NACK information field and the retransmission schedule information field are required in the designed DCI format, where n=2. In another embodiment, the designed DCI format also needs to include an RV information field, where n=3.

Since the ACK/NACK information field is always present, it does not require an indication, so only n-1 bits are needed in the DCI header.

For example, when the designed DCI format needs to contain three fields, n=3, so the DCI header needs 2 bits to indicate whether there is a retransmission schedule information field and an RV information field. The first bit indicates whether there is a retransmission schedule information field (eg, whether the PRB is reassigned and whether the MCS is reassigned), and the second bit indicates whether the RV information field exists. For example, if the bitmap is "00", it means that in the original information bit portion, the retransmission schedule information field and the RV information field do not exist. If the bitmap is "10" means that there is a retransmission schedule information field and there is no RV information field. If the bitmap is "01", it means that there is no retransmission schedule information field but there is an RV information field. If the bitmap is "11", it means that both the retransmission schedule information field and the RV information field exist.

Information section: This section consists of duplicate original information bits. As described above, when the information bits in the DCI header are determined, the contents of the original information bits are fixed. For example, if the DCI header is "11" and the retransmission schedule information field is 12 bits according to the bandwidth, the original information bit will contain 15 bits. The first bit is the ACK/NACK information field, the next 12 bits are the retransmission scheduling information field, and the last two bits are the RV information field.

The original information bits can be repeated any number of times within the entire DCI format length limit. Preferably, the number of repetitions should be as much as possible.

Tail: This part is a padding bit used to form a fixed length DCI format.

In this embodiment, in most cases, the eNB only wants to send 1-bit ACK/NACK information, and the entire DCI format contains only 3-bit information, that is, a 2-bit header and a 1-bit ACK/NACK. . The original information portion of the DCI format is a 1-bit ACK/NACK repetition. Therefore, the new DCI format is more efficient than the normal UL grant and requires much fewer iterations. In addition, this new DCI format maintains scheduling flexibility and efficiency.

FIG. 3 illustrates a flow diagram of a method 300 of performing uplink transmission feedback for an MTC UE 120 in accordance with an embodiment of the present invention.

As shown in FIG. 3, at step 310, the base station 110 is constructed to be dedicated to The DCI information of the MTC UE 120, the DCI information includes at least ACK or NACK information for uplink transmission of the MTC UE 120. For the construction of DCI information, reference can be made to the scheme 1 described above in connection with FIG. 2.

At step 320, base station 110 broadcasts the constructed DCI information to all UEs it serves. Specifically, the base station 110 performs a hashing by adding a cyclic redundancy check (CRC) to the constructed DCI information, performing channel coding, and using the RNTI of the MTC UE 120 to transmit the DCI information via the PDCCH. These specific processing procedures are basically the same as those in the prior art, and therefore will not be described again.

At step 330, the MTC UE 120 despreads the received PDCCH using its RNTI to obtain DCI information for it.

Here, the processing performed by the MTC UE 120 is also substantially the same as in the prior art, except that when it determines that the format of the received DCI information is different from all known DCI formats or the format of the received DCI information is When the DCI format of the MTC UE has not been applied before, the MTC UE 120 determines that the DCI information carries feedback information for its uplink transmission.

4 shows a block diagram of an apparatus 400 for uplink transmission feedback for a MTC UE 120 in a base station 110, in accordance with an embodiment of the present invention.

As shown in FIG. 4, the apparatus 400 includes a DCI construction unit 410 for constructing DCI information dedicated to the MTC UE 120, the DCI information including at least ACK or NACK information for uplink transmission of the MTC UE 120. The construction of DCI information can be seen in the above description in conjunction with Figure 2. Scheme 1.

The apparatus 400 also includes a transmitting unit 420 for broadcasting the constructed DCI information to all UEs served by the base station 110. Specifically, the base station 110 performs a hashing by adding a cyclic redundancy check (CRC) to the constructed DCI information, performing channel coding, and using the RNTI of the MTC UE 120 to transmit the DCI information via the PDCCH. These specific processing procedures are basically the same as those in the prior art, and therefore will not be described again.

With Option 1, high efficiency is achieved while scheduling flexibility is maintained when necessary.

Option 2: DCI information without flexible scheduling

In this scheme, a more efficient DCI format can be designed without considering the flexible scheduling function of retransmission.

Similar to the foregoing scheme 1, the constructed DCI format may be a new DCI format different from any existing DCI format, or may be an existing DCI format that has never been used for an MTC UE before, such as DCI format 1D, DCI. Format 2, any of DCI format 2A, DCI format 2B, DCI format 2C, and DCI format 4.

For the latter, two codewords can be selected from the existing DCI format and reinterpreted as ACK or NACK, respectively. By using the existing DCI format, the UE no longer needs to design to decode another DCI, which will reduce the amount of trials required for blind detection.

For HARQ operations of a normal UE, the time-frequency resource of the retransmission is predetermined, and uses a 1-bit information amount. ACK/NACK information is sufficient. If the base station does not support the retransmission scheduling and RV control functions of the MTC UE, the ACK/NACK information of the 1-bit information amount is sufficient for the MTC UE. A scheme for transmitting the original information of the 1-bit information amount more efficiently in the PDCCH to indicate the ACK/NACK of the MTC UE is provided below.

FIG. 5 is a flow chart showing the PDCCH processing performed by the base station side in the prior art.

It can be seen that in the existing PDCCH processing, attaching the CRC to the original DCI information is not only used to check whether the received data is correct, but also by using the CRC and the RNTI mixed code in combination, so that the UE can blindly check the PDCCH shared by all UEs to receive the target. Its control information.

However, if it is only desired to output a PDCCH representing two different meanings, the original information bit shown in FIG. 5 can be limited to two bit sequences, called the original sequence, and one original sequence indicates the uplink to the MTC UE. The "ACK" of the transmission, another original sequence indicating "NACK" for the uplink transmission of the MTC UE. The original sequence can be thought of as a certain repetition code with a one-bit input of 0 or 1. At this time, the attached CRC is not used for parity, but is also used as a certain type of repetition code.

In this case, using CRC to ensure the correctness of the received data is very inefficient. An effective way is to use channel coding such as repetition. In this scheme, the original sequence originates from 1-bit information and can be regarded as a kind of repetition. The calculated CRC has only two possibilities and can be regarded as another repetition code. The repetition gain can be obtained by using sequence detection.

On the other hand, in this scheme, a simple RNTI mix is sufficient to ensure that the MTC UE can blindly check the entire PDCCH to find its control information. The MTC UE can perform a three-state decision to get its control information in the shared PDCCH. Once the MTC UE blindly detects a possible PDCCH, it can determine whether the PDCCH indicates sequence 0, sequence 1 or not. If the DCI information included in the PDCCH is sequence 0 or 1, it is an ACK/NACK to the MTC UE, otherwise the PDCCH is not an ACK/NACK to the MTC UE.

It should be noted that this tri-state decision is easy to perform and does not increase the decoding complexity of the MTC UE. The MTC UE only has to measure the DCI information and the correlation values of the sequences 0 and 1. If the correlation value with sequence 0 or 1 exceeds the threshold, the MTC UE considers it to be sequence 0 or 1, ie, is an ACK or NACK for the uplink transmission of the MTC UE. Otherwise the PDCCH is considered not to be its own.

Since the sequence is very long, other sequences are like noise after correlation.

Therefore, this ACK/NACK format can be regarded as having a very large aggregation level and having a very large coverage gain. For example, if the original sequence length is 44, the original 1 bit is repeated 44 times in an ACK or NACK. As a result, for the new ACK/NACK format, only one or two repetitions are sufficient to meet the most demanding coverage extension requirements.

6 shows a flow diagram of another method 600 for uplink transmission feedback for an MTC UE, in accordance with an embodiment of the present invention.

As shown in FIG. 6, at step 610, the base station 110 constructs DCI information dedicated to the MTC UE 120, the DCI information including the first sequence or Different from the second sequence of the first sequence, ACK or NACK is performed on the uplink transmission of the MTC UE 120, respectively.

At step 620, the base station 110 uses the RNTI of the MTC UE 120 to remix the constructed DCI information.

At step 630, the base station 110 broadcasts the coded DCI information to all UEs it serves. Here, the base station 110 broadcasts the coded DCI information to all UEs via the PDCCH.

At step 640, the MTC UE 120 receives the PDCCH broadcast by the base station 110.

At step 650, the MTC UE 120 despreads the received PDCCH using its RNTI to obtain DCI information for it.

In step 660, the MTC UE 120 correlates the obtained DCI information using the first sequence and the second sequence to determine whether the DCI information includes ACK or NACK information for its uplink transmission.

The step 660 further includes: when the obtained DCI information and the correlation value of the first sequence is greater than a first threshold, determining that the DCI information includes ACK information for uplink transmission of the MTC UE 120; when the obtained DCI information When the correlation value of the second sequence is greater than a second threshold, determining that the DCI information includes NACK information for uplink transmission of the MTC UE 120; when the obtained DCI information and the first sequence have a correlation value not greater than the first When the threshold and the correlation value with the second sequence are not greater than the second threshold, it is determined that there is no DCI information for the MTC UE 120 in the received PDCCH.

FIG. 7 shows a block diagram of an apparatus 700 for performing uplink transmission feedback for a MTC UE 120 in a base station 110.

As shown in FIG. 7, the apparatus 700 includes a DCI construction unit 710 for constructing DCI information dedicated to the MTC UE 120, where the DCI information includes a first sequence or a second sequence different from the first sequence, and the first sequence is used. The ACK is performed on the uplink transmission of the MTC UE 120, and the second sequence is used to perform NACK on the uplink transmission of the MTC UE 120. The mashup unit 720 is configured to perform the suffixing of the DCI information by using the RNTI of the MTC UE 120. The sending unit 730 is configured to broadcast the coded DCI information to all UEs served by the base station 110.

FIG. 8 shows a block diagram of an apparatus 800 for receiving uplink transmission feedback from a base station 110 in an MTC UE 120.

As shown in FIG. 8, the apparatus 800 includes a receiving unit 810, configured to receive a PDCCH broadcast by the base station 110, and a unmixing unit 820, configured to use the RNTI of the MTC UE 120 to unmix the received PDCCH to obtain a dedicated The DCI information of the MTC UE 120 is used by the correlation unit 830 to correlate the DCI information by using the first sequence and the second sequence to determine whether the DCI information includes ACK or NACK information for the uplink transmission of the MTC UE 120. .

Performance analysis

According to the analysis conducted by MediaTek (see reference [1]), PHICH requires 10.33 dB coverage enhancement, ie, 20-25 repetitions. The PDCCH requires 9.6 dB coverage enhancement, approximately 20 repetitions. Result, make Two existing alternatives that directly repeat PHICH and UL grants (43-bit payload including CRC) will consume 240-300 resource units (REs) and 5760 REs, respectively.

For the format that maintains the retransmission schedule and RV control functions, if there are two domains, a load of about 20 bits is required including the CRC, so about 2800 REs are required. More than 50% of resources can be saved compared to UL grants with the same capacity. If only the ACK/NACK field is required, the load size including the CRC is 11 bits, and 1400 REs are needed, which will save 75% of resources. Therefore, the proposed scheme has fewer resources than the UL grant, but more resources than the PHICH, however reusing the PDCCH to carry the ACK/NACK does not add extra complexity to the base station. For formats designed to only indicate ACK/NACK, the efficiency is higher (because there is no need to pass the CRC check to determine if the accept sequence is correct), it will occupy approximately 300-500 REs.

It can be seen that the solution of the present invention combines the advantages of both repeated transmission of PHICH and UL grants: no adverse effects on normal UE/base stations, retransmission control and scheduling flexibility and efficiency.

As used herein, the term "base station" may refer to a coverage area of a base station and/or a base station or base station subsystem serving the coverage area, depending on the context in which the term is used. In the present disclosure, the term "base station" may be used interchangeably with "community", "Node B", "eNodeB", etc., depending on the context.

The methods disclosed herein are described herein with reference to the drawings. However, it should be understood that the steps shown in the drawings and described in the specification The order of the steps is merely illustrative, and the method steps and/or actions may be performed in a different order and are not limited to the specifics illustrated in the drawings and described in the specification, without departing from the scope of the claims. order.

In one or more exemplary designs, the functions described in this application can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored as one or more instructions or code on a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer-readable media includes computer storage media and communication media, including communication media including any media that facilitates transfer of the computer program from one place to another. The storage medium can be any available media that is accessible to a general purpose or special purpose computer. Such computer readable media may include, for example, without limitation, RAM, ROM, EEPROM, CD-ROM or other optical disk storage device, magnetic disk storage device or other magnetic storage device, or may be used in a general purpose or special purpose computer or general purpose or Any other medium in the form of an instruction or data structure accessible by the dedicated processor to carry or store the desired code module. Also, any connection can be termed a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial Cables, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are also included in the definition of the media.

Can use general purpose processor, digital signal processor (DSP), dedicated An integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of functions described herein for performing or Various exemplary logic blocks, modules, and circuits are described in connection with the present disclosure. A general purpose processor may be a microprocessor, or the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such structure.

Those of ordinary skill in the art will also appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments of the present application can be implemented as an electronic hardware, a computer software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described in terms of their functionality. Whether this function is implemented as a hardware or as a software depends on the particular application and design constraints imposed on the overall system. A person skilled in the art can implement the described functions in a modified manner for each specific application, but such implementation decisions should not be construed as departing from the scope of the invention.

The above description of the disclosure is provided to enable any person skilled in the art to make or use the invention. Various modifications of the present disclosure are obvious to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit and scope of the invention. Thus, the invention is not limited to the examples described herein And design, but in accordance with the broadest scope of the principles and novel features disclosed herein.

references:

[1] R1-134443 “Need of UL HARQ and PHICH enhancement”, MediaTek Inc, 3GPP RAN1 #74bis.

Claims (17)

A method for performing uplink transmission feedback for a machine type communication (MTC) user equipment (UE) in a base station, comprising: constructing downlink control information (DCI) information dedicated to an MTC UE, wherein the DCI information is at least A positive acknowledgment (ACK) or negative acknowledgment (NACK) information is included for the uplink transmission of the MTC UE; the DCI information is broadcast to all UEs served by the base station. The method of claim 1, wherein the format of the DCI information is different from all known DCI formats. The method of claim 1, wherein the format of the DCI information is a DCI format that has never been applied to an MTC UE before. The method of claim 3, wherein the format of the DCI message comprises one of the following various formats: DCI format 1D, DCI format 2, DCI format 2A, DCI format 2B, DCI format 2C, DCI format 4. The method of claim 1, wherein the DCI information further comprises: retransmission scheduling information, configured to indicate to the MTC UE to perform uplink retransmission if the DCI information is included in the DCI information. Physical Resource Block (PRB) information and/or Modulation and Coding Scheme (MCS) information used. The method of claim 1, wherein the DCI information further comprises: redundancy version (RV) information, which is included in the DCI information. In the case of NACK information, the MTC UE is instructed to use the RV information used for uplink retransmission. The method of claim 5, wherein the DCI information further includes a DCI header for indicating whether the retransmission schedule information and/or the RV information is present in the DCI information. The method of claim 5, wherein the DCI information includes one or more duplicate original information bit portions, each original information bit portion including the ACK or NACK information, and optionally the Retransmit schedule information and/or the RV information. An apparatus for performing uplink transmission feedback for a Machine Type Communication (MTC) User Equipment (UE) in a base station, comprising: a DCI construction unit for constructing Downlink Control Information (DCI) information dedicated to the MTC UE And the DCI information includes at least positive acknowledgement (ACK) or negative acknowledgement (NACK) information for the uplink transmission of the MTC UE, and a sending unit, configured to broadcast the DCI information to all UEs served by the base station. A method for performing uplink transmission feedback for a Machine Type Communication (MTC) User Equipment (UE) in a base station, comprising: constructing Downlink Control Information (DCI) information dedicated to an MTC UE, the DCI information included a first sequence or a second sequence different from the first sequence, wherein the first sequence is used for a positive acknowledgment (ACK) for the uplink transmission of the MTC UE, and the second sequence is used for uplinking the MTC UE Negative acknowledgement (NACK) of link transmission; The DCI information is mixed using the wireless network temporary identifier (RNTI) of the MTC UE; and the coded DCI information is broadcast to all UEs served by the base station. The method of claim 10, wherein the format of the DCI information is different from all known DCI formats. The method of claim 10, wherein the format of the DCI information is a DCI format that was not previously applicable to the MTC UE. The method of claim 12, wherein the format of the DCI message comprises one of the following various formats: DCI format 1D, DCI format 2, DCI format 2A, DCI format 2B, DCI format 2C, DCI format 4. An apparatus for performing uplink transmission feedback for a Machine Type Communication (MTC) User Equipment (UE) in a base station, comprising: a DCI construction unit for constructing Downlink Control Information (DCI) information dedicated to the MTC UE The DCI information includes a first sequence or a second sequence different from the first sequence, where the first sequence is used for positive acknowledgement (ACK) of the uplink transmission of the MTC UE, and the second sequence is used for Performing a negative acknowledgement (NACK) on the uplink transmission of the MTC UE; the codec unit is configured to perform the codec on the DCI information by using a radio network temporary identifier (RNTI) of the MTC UE, and a sending unit, configured to All UEs served by the base station broadcast the coded DCI information. A method for receiving uplink transmission feedback from a base station in a Machine Type Communication (MTC) User Equipment (UE), comprising: receiving a Physical Downlink Shared Channel (PDCCH) broadcast by the base station; using the MTC The radio network temporary identifier (RNTI) of the UE de-mixes the PDCCH to obtain downlink control information (DCI) information dedicated to the MTC UE; and correlates the DCI information using the first sequence and the second sequence to determine Whether the DCI information includes positive acknowledgement (ACK) or negative acknowledgement (NACK) information for the uplink transmission of the MTC UE. The method of claim 15, further comprising: determining that the DCI information includes an uplink transmission to the MTC UE when the correlation value of the DCI information and the first sequence is greater than a first threshold. ACK information; when the correlation value of the DCI information and the second sequence is greater than a second threshold, determining that the DCI information includes NACK information for an uplink transmission of the MTC UE; when the DCI information and the first sequence When the correlation value is not greater than the first threshold and the correlation value of the DCI information and the second sequence is not greater than the second threshold, determining that there is no DCI information for the MTC UE in the PDCCH. A device for receiving uplink transmission feedback from a base station in a Machine Type Communication (MTC) User Equipment (UE), The method includes: a receiving unit, configured to receive a physical downlink shared channel (PDCCH) broadcasted by the base station, and a unmixing unit, configured to use the wireless network temporary identifier (RNTI) of the MTC UE to perform the unmixing of the PDCCH to obtain Dedicated downlink control information (DCI) information dedicated to the MTC UE; the correlation unit is configured to correlate the DCI information by using the first sequence and the second sequence to determine whether the DCI information includes an uplink to the MTC UE A positive acknowledgment (ACK) or negative acknowledgment (NACK) message transmitted.