CN101330306A - Sending method of rank indication information - Google Patents

Abstract

The present invention discloses a method for sending rank indication information. The method includes: when the rank indication information, feedback information, and scheduling request information are sent in the same subframe, jointly encoding the rank indication information, feedback information, and scheduling request information , and use the PUCCH format 2 format to send the jointly encoded information. The present invention solves the problem of destroying the orthogonality of codes between PUCCH channels caused by sending RI information, SR information and ACK/NACK information in the same subframe, and ensures the overall performance of the system.

Description

Sending method of rank indication information

technical field

The present invention relates to the communication field, in particular to a method for sending rank indication information.

Background technique

Multiple-Input Multiple-Out-put (MIMO) technology is the key technology of the third generation (3G) and fourth generation (4G) mobile communication systems, which can increase system capacity and improve transmission performance , and can be well integrated with other physical layer technologies. However, when the channel correlation is strong, the diversity gain and multiplexing gain brought by the multipath channel will be greatly reduced, resulting in a significant drop in MIMO system performance. At present, a new MIMO precoding method is proposed. This method is an efficient MIMO multiplexing method. The MIMO channel is divided into multiple independent virtual channels through precoding processing at the transceiver end, which effectively eliminates the channel correlation. Therefore, the precoding technology ensures the stability of the MIMO system in various environments.

The Long Term Evolution (referred to as LTE) system is an important plan of the third generation partnership organization. The realization of precoding technology in LTE is to set the code in the user equipment (User Equipment, referred to as UE) and the base station (eNodeB). This (a set of precoding matrices), the UE selects the best precoding matrix from the codebook according to certain criteria (for example, throughput maximization or the right singular matrix closest to the channel matrix), and sets the precoding matrix index (Precoding Matrix Index, PMI for short) is fed back to the eNodeB, and the eNodeB finds the corresponding precoding matrix in the codebook according to the received PMI, and applies this precoding matrix for precoding transmission in the downlink transmission. In addition, it also needs to be fed back in the uplink channel Rank indication (RI) information, the RI information indicates the maximum number of symbols that can be transmitted on one subcarrier.

Figure 1 shows a schematic structural diagram of the basic frame structure in the LTE system. As shown in Figure 1, the frame structure is divided into four levels: radio frame, half frame, subframe, time slot and symbol, wherein the length of a radio frame is 10ms, a radio frame consists of two half-frames, the length of each half-frame is 5ms, a half-frame consists of 5 subframes, the length of each subframe is 1ms, and a subframe consists of two time slots, each The length of the time slot is 0.5 ms.

When the LTE system uses a conventional cyclic prefix, a slot contains 7 uplink/downlink symbols with a length of 66.7us, among which, the cyclic prefix length of the first symbol is 5.21us, and the cyclic prefix length of the other 6 symbols is 4.69us .

When the LTE system adopts the extended cyclic prefix, one time slot includes 6 uplink/downlink symbols with a length of 66.7us, wherein the length of the cyclic prefix of each symbol is 16.67us.

A Resource Element (referred to as RE) is a subcarrier in an Orthogonal Frequency Division Multiplexing (referred to as OFDM) symbol, and a downlink resource block (Resource Block, referred to as RB) consists of It consists of 12 consecutive subcarriers and 7 consecutive OFDM symbols (6 OFDM symbols in the case of long CP), which is 180kHz in the frequency domain and the time length of a general time slot in the time domain. Figure 2 shows the LTE system A schematic structural diagram of a resource block with a medium bandwidth of 5 MHz is shown in FIG. 2 . When resource allocation is performed, the resource block is used as a basic unit for allocation.

When the target user feeds back RI information, if the target user does not need to send data, the RI information is transmitted in the Physical Uplink Control Channel (PUCCH for short), and if the target user needs to send data, the RI information is transmitted in the Transmission in a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH for short).

The format of PUCCH is divided into six types: format 1, format 1a, format 1b and format 2, format 2a, format 2b. Among them, format 1 is used to transmit 1-bit scheduling request (Scheduling Request, referred to as SR) information, indicating that there is or Without SR, format 1a is used to transmit ACK/NACK (Acknowledgment/Negative Acknowledgment) information of 1-bit single-code word stream, and format 1b is used to transmit ACK/NACK information of 2-bit dual-code word stream, where each code The word stream corresponds to 1-bit ACK/NACK information, format 2 is used to transmit Channel Quality Indicator (CQI)/PMI and RI information, and format 2a is used to transmit CQI/PMI and RI information, single code word stream ACK/NACK information, format2b is used to transmit CQI/PMI and RI information, dual codeword stream ACK/NACK information, format2a and format 2b are used for scenarios where the cyclic prefix is a regular cyclic prefix; Figure 3 shows the physical uplink in the LTE system Schematic diagram of the frequency domain position of the control channel, as shown in Figure 3, each PUCCH channel occupies two resource blocks of resources; the length of the RI information is 1 bit or 2 bits, and when the RI information and the CQI/PMI information are in the same subframe When sending in , only RI information is sent.

The channel structure of PUCCH format 2 is described below:

Figure 4 shows a schematic diagram of the PUCCH channel used to transmit RI information when the system uses a conventional cyclic prefix. As shown in Figure 4, in the conventional cyclic prefix, a CAZAC sequence with a length of 12 is selected as the basic sequence, and the CAZAC The sequence is repeated 7 times, and a CAZAC sequence is mapped to 12 frequency domain positions on each symbol of a resource block, where the sequences on the symbols of time slots #0, #2, #3, #4, and #6 are used For data transmission on the PUCCH channel, the sequences on symbols of time slots #1 and #5 are used for transmission of a reference signal (Reference Signal, referred to as RS) on the PUCCH channel.

Figure 5 shows a schematic diagram of the PUCCH channel used to transmit RI information when the system uses an extended cyclic prefix. As shown in Figure 5, in the extended cyclic prefix, a CAZAC sequence with a length of 12 is selected as the basic sequence, and the CAZAC The sequence is repeated 6 times, and a CAZAC sequence is mapped to 12 frequency domain positions on each symbol of a resource block, where the sequences on the symbols of time slots #0, #1, #3, #4, and #5 are used For data transmission on the PUCCH channel, the sequence on the symbols of the time slot #2 is used for reference signal transmission on the PUCCH channel.

The number of bits of encoded CQI/PMI and RI information is 20, and the encoded bits are subjected to quadrature phase shift keying (QPSK) modulation, modulated into 10 QPSK modulation symbols, and 5 QPSK modulations are mapped on each time slot symbols, and let each modulation symbol correspond to a data sequence of a PUCCH channel, multiply the modulation symbol by the target data sequence, map it to a corresponding carrier and send it out.

The channel structure of PUCCH format 2a is based on PUCCH format 2. After BPSK modulation is performed on 1-bit ACK/NACK information, it is multiplied by the second reference signal sequence of each time slot in the PUCCH format2 structure, and the phase The multiplied result is mapped to the corresponding carrier and sent out.

The channel structure of PUCCH format 2b is based on PUCCH format 2. After QPSK modulation is performed on 2-bit ACK/NACK information, it is multiplied by the second reference signal sequence of each time slot in the PUCCH format2 structure, and the phase The multiplied result is mapped to the corresponding carrier and sent out;

In the LTE system, uplink data is transmitted using SC-FDMA, which requires continuous mapping of uplink resources, and all transmitted data on each symbol is processed by DFT after modulation and mapped to frequency domain positions. Moreover, if two or more PUCCH formats are sent in the same subframe, inter-symbol interference will be caused, and the orthogonality of codes between PUCCH channels cannot be guaranteed, resulting in system performance degradation. Currently, RI information, SR information and The prior art does not provide a specific solution for the method of sending ACK/NACK information in the same subframe.

Contents of the invention

Considering the need for a technology in the related art to solve the problem of how to send RI information, ACK/NACK information and SR information in the same subframe, the present invention is proposed. Therefore, the main purpose of the present invention is to provide a A method and device for sending rank indication information to solve the above problems.

According to one aspect of the present invention, a method for sending rank indication information is provided.

The method for sending rank indication information according to an embodiment of the present invention includes: when the rank indication information, feedback information, and scheduling request information are sent in the same subframe, jointly encode the rank indication information, feedback information, and scheduling request information, and use The PUCCH format 2 format sends jointly coded information, and the above feedback information includes one of the following: correct response is ACK information, and error response is NACK information.

Wherein, the joint coding of the rank indication information, the feedback information and the scheduling request information specifically includes: performing joint coding according to the order of the rank indication information, the feedback information, and the scheduling request information; Joint encoding is performed sequentially, and the information after the joint encoding is 20 bits.

According to one aspect of the present invention, a method for sending rank indication information is provided.

The method for sending rank indication information according to an embodiment of the present invention includes: when the rank indication information, feedback information, and scheduling request information are sent in the same subframe, if the subframe adopts a regular cyclic prefix, the rank indication information and the scheduling request information Joint encoding, and use the PUCCH format 2a format or PUCCH format 2b format to send the jointly encoded information; if the subframe uses an extended cyclic prefix, jointly encode the rank indication information, feedback information and scheduling request information, and use the PUCCH format 2 format Send jointly encoded information.

Wherein, the joint encoding of the rank indication information and the scheduling request information specifically includes: performing joint encoding in the order that the rank indication information comes first and the scheduling request information follows, and the information after the joint encoding is 20 bits.

Preferably, the joint coding of the rank indication information, the feedback information and the scheduling request information specifically includes: performing joint coding according to the order of the rank indication information, the feedback information, and the scheduling request information; or, performing joint coding according to the order of the rank indication information, the scheduling request information, and the feedback information Joint encoding is performed in the order of the joint encoding, and the information after the joint encoding is 20 bits.

According to one aspect of the present invention, a method for sending rank indication information is provided.

The method for sending rank indication information according to an embodiment of the present invention includes: when the rank indication information, feedback information, and scheduling request information are sent in the same subframe, using the PUCCH channel for transmitting the scheduling request information to transmit the feedback information, and not sending the rank indication information .

According to one aspect of the present invention, a method for sending rank indication information is provided.

The method for sending rank indication information according to an embodiment of the present invention includes: when rank indication information, feedback information, and scheduling request information are sent in the same subframe, using a PUSCH channel to transmit rank indication information, feedback information, and scheduling request information.

Through at least one of the above technical solutions of the present invention, the problem of the orthogonality destruction of codes between PUCCH channels caused by RI information, SR information and ACK/NACK information being sent in the same subframe is solved, ensuring the integrity of the system performance.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

FIG. 1 is a schematic structural diagram of a basic frame structure in an LTE system according to related technologies;

FIG. 2 is a schematic diagram of a resource block with a bandwidth of 5 MHz in an LTE system according to the related art;

FIG. 3 is a schematic diagram of a frequency domain location of a physical uplink control channel in an LTE system according to the related art;

FIG. 4 is a schematic diagram of a PUCCH channel used to transmit RI information when a conventional cyclic prefix is used in a system according to the related art;

FIG. 5 is a schematic diagram of a PUCCH channel used to transmit RI information when an extended cyclic prefix is used in a system according to the related art;

FIG. 6 is a flowchart of a method for sending rank indication information according to a method embodiment of the present invention;

Fig. 7 is a flowchart of a method for sending rank indication information according to a method embodiment of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings.

method embodiment

According to an embodiment of the present invention, a method for sending rank indication information is provided.

FIG. 6 is a flowchart of a method for sending rank indication information according to an embodiment of the present invention. As shown in FIG. 6, the method includes the following steps:

Step S602, when rank indication (RI) information, feedback information, and scheduling request (SR) information are sent in the same subframe, jointly encode the RI information, feedback information, and SR information, wherein the feedback information includes one of the following : ACK information, NACK information;

Step S604, using the PUCCH format 2 format to send the jointly coded information, the jointly coded information is 20 bits.

Through the technical solution provided by the embodiment of the present invention, the problem of the orthogonality destruction of codes between PUCCH channels caused by RI information, SR information and ACK/NACK information being sent in the same subframe is solved, and the whole system is guaranteed performance.

Wherein, in step S602, the joint encoding of RI information, feedback information, and SR information specifically includes: performing joint encoding in accordance with the order of RI information, feedback information, and SR information, or performing joint encoding in accordance with the order of RI information, SR information, and feedback information Sequential joint encoding.

FIG. 7 is a flowchart of a method for sending rank indication information according to an embodiment of the present invention. As shown in FIG. 7, the method includes the following steps:

Step S702, when the RI information, the feedback information, and the SR information are in the same subframe, if the subframe adopts a regular cyclic prefix, jointly encode the RI information and the SR information, in the order that the RI information comes first and the SR information follows Perform joint encoding, and use the PUCCH format 2a format or PUCCH format 2b format to send the jointly encoded information, and the jointly encoded information is 20 bits;

Step S704, if the subframe adopts the extended cyclic prefix, jointly code the RI information, the feedback information and the SR information, wherein the joint coding can be performed in the order of the RI information, the feedback information, and the SR information; or according to the order of the RI information, the SR information, The order of the feedback information is jointly encoded, and the jointly encoded information is sent in the PUCCH format 2 format, and the jointly encoded information is 20 bits.

Through the technical solution provided by the embodiment of the present invention, the problem of the orthogonality destruction of codes between PUCCH channels caused by RI information, SR information and ACK/NACK information being sent in the same subframe is solved, and the whole system is guaranteed performance.

Fig. 2 shows a schematic structural diagram of resource blocks of a 3GPP LTE system with a bandwidth of 5M. As shown in Fig. 2, the system includes 512 subcarriers in total, wherein the available subcarriers are the middle 300, and each resource block includes With 12 consecutive subcarriers, the 3GPP LTE system with 5M bandwidth includes a total of 25 resource blocks. If the number of resource blocks available for uplink is N _RB ^UL , all resource blocks are numbered from low to high in the frequency domain as 0, 1 , 2, ..., N _RB ^UL -1, N _PRB represents the index of the resource block, then the frequency domain position of the PUCCH channel numbered m is as shown in Figure 3, and the 3GPP LTE system with a bandwidth of 5M is taken as an example below, The embodiments of the present invention will be described in detail.

Example one

For the target user, when rank indication information, feedback information, and SR information are sent in the same subframe, the following describes the embodiment of the present invention in the following cases:

Case 1: The target user does not have SR information to send. When using the subframe structure of the conventional cyclic prefix, use PUCCH format 2a or PUCCH format 2b to send RI information and ACK/NACK information; when using the subframe structure of the extended cyclic prefix, The RI information and the ACK/NACK information can be jointly encoded first, the jointly encoded result is obtained, and the jointly encoded result is sent using PUCCH format 2.

Case 2: The target user needs to send SR information. At this time, the RI information, ACK/NACK information and SR information can be jointly encoded first to obtain the joint encoded result, and send the jointly encoded result using PUCCH format 2 , where the three can be jointly coded according to the order of RI information first, then ACK/NACK information, and finally SR information.

According to an embodiment of the present invention, a method for sending rank indication information is provided. In this embodiment, when RI information, feedback information, and SR information are in the same subframe, the PUCCH channel for transmitting SR information is used to transmit the feedback information. Send RI information.

Through the technical solution provided by the embodiment of the present invention, the problem of the orthogonality destruction of codes between PUCCH channels caused by RI information, SR information and ACK/NACK information being sent in the same subframe is solved, and the whole system is guaranteed performance.

Example two

The following still uses the 3GPP LTE system with a bandwidth of 5M in Example 1 as an example to illustrate. For the target user, when the PUCCH channel for transmitting RI information and the PUCCH channel for transmitting SR information are sent in the same subframe, there are two types of Situation describes the embodiment of the present invention:

Situation 1: The target user does not have SR information to send. First, the RI information and ACK/NACK information are jointly encoded to obtain the jointly encoded result, and the jointly encoded result is sent using PUCCH format 2;

Case 2: The target user needs to send SR information. At this time, the target user can use the PUCCH channel allocated by the base station for transmitting SR information to transmit ACK/NACK information without sending RI information.

According to an embodiment of the present invention, a method for sending rank indication information is provided. In this embodiment, when the RI information, feedback information, and SR information are in the same subframe, the PUSCH channel is used to transmit the RI information, feedback information, and SR information .

Example three

The following still uses the 3GPP LTE system with a bandwidth of 5M in Example 1 as an example to illustrate. For the target user, when the PUCCH channel for transmitting RI information and the PUCCH channel for transmitting SR information are sent in the same subframe, there are two types of Situation describes the embodiment of the present invention:

Case 1: In a time division duplex system, the target user has no SR information to send. When the RI information and ACK/NACK information are sent in the same subframe, when the subframe structure of the conventional cyclic prefix is used, all ACK/NACK information The information is encoded, the number of encoded bits is 20, QPSK modulation is performed, the modulated information is sent using format 2, and the modulated RI information (BPSK modulation is performed when the RI information is 1 bit, QPSK modulation is performed when the RI information is 2 bits) Multiply with the second reference signal sequence of each time slot, and then map the PUCCH channel to the time-frequency resource and send it out;

Case 2: The target user needs to send SR information. At this time, the PUSCH channel allocated by the base station can be used to transmit ACK/NACK information, SR information and RI information at the same time.

As mentioned above, with the help of the method and/or device for sending rank indication information provided by the present invention, it solves the problems caused by the transmission of RI information, SR information and ACK/NACK information in the same subframe to the code between PUCCH channels. The problem of interactive destruction is guaranteed to ensure the overall performance of the system.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. A method for sending rank indication information, comprising: When the rank indication information, feedback information, and scheduling request (SR) information are sent in the same subframe, the rank indication information, feedback information, and scheduling request information are jointly encoded, and the jointly encoded information is sent in the PUCCH format 2 format. 2. The method according to claim 1, wherein the joint encoding of rank indication information, feedback information and scheduling request information specifically comprises: performing joint encoding in the order of the rank indication information, the feedback information, and the scheduling request information; or Joint encoding is performed in the order of the rank indication information, the scheduling request information, and the feedback information. 3. The method according to claim 1 or 2, wherein the jointly coded information is 20 bits. 4. The method according to claim 1 or 2, wherein the feedback information includes one of the following: ACK information for a correct response, and NACK information for an incorrect response. 5. A method for sending rank indication information, comprising: When the rank indication information, feedback information, and scheduling request information are sent in the same subframe, if the subframe uses a conventional cyclic prefix, the rank indication information and the scheduling request information are jointly encoded, and the PUCCH format 2a format or PUCCH format is used 2b format to send jointly encoded information; If the subframe adopts an extended cyclic prefix, jointly code the rank indication information, feedback information and scheduling request information, and use the PUCCH format 2 format to send the jointly coded information. 6. The method according to claim 5, wherein the joint encoding of the rank indication information and the scheduling request information specifically comprises: The joint coding is performed in the order that the rank indication information comes first and the scheduling request information comes next. 7. The method according to claim 5 or 6, wherein the jointly coded information is 20 bits. 8. The method according to claim 5, wherein the joint encoding of rank indication information, feedback information and scheduling request information specifically comprises: performing joint encoding in the order of the rank indication information, the feedback information, and the scheduling request information; or Joint encoding is performed in the order of the rank indication information, the scheduling request information, and the feedback information. 9. The method according to claim 5 or 8, wherein the jointly coded information is 20 bits. 10. A method for sending rank indication information, comprising: When rank indication information, feedback information, and scheduling request information are sent in the same subframe, the physical uplink control channel (PUCCH), which transmits the scheduling request information, is used to transmit the feedback information, and the rank indication information is not sent. 11. A method for sending rank indication information, comprising: When the rank indication information, the feedback information, and the scheduling request information are sent in the same subframe, the rank indication information, the feedback information, and the scheduling request information are transmitted using a physical uplink shared channel, that is, a PUSCH channel.

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