CN106301695B - A kind of uplink control channel method for transmitting signals - Google Patents

Abstract

The present invention provides an uplink control channel signal transmission method, characterized in that the method includes: when the terminal needs to send a signal, if it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is greater than 20 bits, and no If it is greater than 64 bits, the payload corresponding to the signal to be sent is accelerated and matched by convolutional coding to form 120 bits, and modulated to form 60 symbols, which are mapped to 12 subcarriers corresponding to the starting position configured for the first PUCCH format, 5 After performing orthogonal spreading with a spreading factor of 2 on each OFF symbol, it is sent to the base station through the uplink control channel. The technical solution can send a payload larger than 20 bits through the uplink control channel.

Description

A kind of uplink control channel signal transmission method

technical field

The present invention relates to the field of communication technologies, and in particular, to a method for transmitting an uplink control channel signal.

Background technique

The carrier aggregation standardization work started in 3GPP Rel-10, which supports aggregation of up to 5 downlink carriers. Rel-11 extends the carrier aggregation framework to TDD carrier aggregation under different uplink and downlink configurations, and Rel-12 extends FDD-TDD carriers polymerization. Rel-13 introduced the technology of using unlicensed frequency bands for LTE, making it possible to extend LTE carrier aggregation to the 5GHz unlicensed frequency band, while the WLAN standard IEEE802.11ac on the 5GHz frequency band already supports 80MHz and 160MHz bandwidth. In addition, in addition to In addition to the frequency bands that are widely used in the LTE system, there are new frequency bands that can aggregate multiple carriers on the same frequency band, such as the 3.5GHz frequency band, so it is necessary to extend the carrier aggregation to more than 5 carriers, so as to use the spectrum more efficiently .

After the number of aggregated carriers is extended to more than 5, if the Physical Uplink Control Channel (PUCCH) is still sent on the primary carrier, the load of the uplink control channel will increase a lot. In the FDD system, since a maximum of 32 downlink carriers are aggregated, each carrier has a maximum of two transport blocks, and the required ACK/NACK bits are at most 64 bits. Similarly, in the TDD system, taking the time slot ratio 2 as an example, Even with spatial bundling, the required ACK/NACK bits are up to 128 bits.

However, the PUCCH format 3 in the existing LTE system supports the transmission of ACK/NACK of 20 bits at most, but cannot support the transmission of ACK/NACK of more than 20 bits.

Therefore, it is necessary to consider reducing the overhead of the control channel, or design a new PUCCH format to support HARQ ACK/NACK transmission of more bits.

SUMMARY OF THE INVENTION

In view of this, the present application provides an uplink control channel signal transmission method to solve the problem that a payload larger than 20 bits cannot be sent through the uplink control channel.

In order to solve the above-mentioned technical problems, the technical solution of the present application is realized as follows:

An uplink control channel signal transmission method, characterized in that the method comprises:

The base station configures the starting position of the first PUCCH format according to the load situation, and notifies the terminals served by the base station;

When the terminal receives the starting position configured for the first PUCCH format notified by the base station, it stores it;

When the terminal needs to send a signal, if it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is greater than 20 bits and not greater than 64 bits, the load corresponding to the signal to be sent is accelerated and matched by convolution encoding to form 120 bits. bits, and modulated to form 60 symbols, which are mapped to 12 subcarriers and 5 OFDM symbols corresponding to the starting position configured for the first PUCCHformat, and after orthogonal spreading with a spreading factor of 2, the uplink control channel to the base station.

It can be seen from the above technical solutions that the present application sets a new PUCCH format, and uses the PUCCH format to send a payload of more than 20 bits and no greater than 64 bits. bit payload.

Description of drawings

FIG. 1 is a schematic diagram of PUCCH resource allocation in an embodiment of the present application;

Fig. 2 is a schematic diagram of the number of ACK/NACK bits with spatial bundling;

3 is a schematic flowchart of a method for transmitting an uplink control channel signal in an embodiment of the present application;

4 is a schematic diagram of symbol mapping when the first PUCCH format is used in an embodiment of the present application;

FIG. 5 is a schematic diagram of symbol mapping when the second PUCCH format is used in an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

An embodiment of the present application provides a method for transmitting an uplink control channel signal. The base station sets two different formats to support the transmission of ACK/NACK with more than 20 bits and less than 128 bits.

Two different formats newly set by the base station are: a first PUCCH format and a second PUCCH format, which are different from PUCCH format 3 in the existing implementation. In specific implementation, 4 may be used to identify the first PUCCH format, that is, PUCCH format 4; and 5 may be used to identify the second PUCCH format, that is, PUCCH format 5. The specific implementation is not limited to the above implementation.

The base station configures the starting positions of PUCCH format 3, the first PUCCH format and the second PUCCH format according to the load situation, and notifies each terminal served by the base station.

When the terminal receives the start position configured by the first PUCCH format, the second PUCCH format and the PUCCH format 3 notified by the base station, the terminal stores it;

Referring to FIG. 1, FIG. 1 is a schematic diagram of PUCCH resource allocation in an embodiment of the present application. In FIG. 1 , the first PUCCH format is set to PUCCH format 4, and the second PUCCH format is set to PUCCH format 5. PUCCHformat 3 is PUCCH format 3 in the existing implementation.

The starting position of each PUCCH format configuration is given in FIG. 1 , which is an implementation manner, and the specific implementation is not limited to the above implementation manner.

For any terminal, when it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is greater than 20 bits and not greater than 64 bits, the first PUCCH format is used to send the signal to be sent; when it is determined that the number of scheduled carriers and the number of downlink subframes is determined When the product M of numbers is greater than 64 bits and not greater than 128 bits, use the second PUCCH format to send the signal to be sent; when it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is not greater than 20 bits, use PUCCH format 3 Send the signal to be sent.

Referring to FIG. 2, FIG. 2 is a schematic diagram of the number of ACK/NACK bits with spatial bundling. In FIG. 2 , when the number of carriers scheduled by the terminal is greater than 5, the product of the number of scheduled carriers and the number of downlink subframes may be greater than 20 bits.

The following describes in detail how the uplink control channel transmits signals in the specific embodiments of the present application in detail with reference to the accompanying drawings.

Referring to FIG. 3 , FIG. 3 is a schematic flowchart of a method for transmitting an uplink control channel signal in an embodiment of the present application. The specific steps are:

Step 301, when the terminal needs to send a signal, if it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is greater than 20 bits and not greater than 64 bits, then the load corresponding to the signal to be sent is formed after accelerated matching by convolutional coding. 120 bits, and modulated to form 60 symbols.

After 120 bits are formed, interference can also be added and then modulated to form 60 symbols. In specific modulation, QPSK modulation can be performed.

Step 302, the terminal maps the 60 symbols formed by modulation to 12 subcarriers and 5 OFDM symbols corresponding to the starting position configured for the first PUCCH format, and performs orthogonal spreading with a spreading factor of 2. , sent to the base station through the uplink control channel.

Referring to FIG. 4 , FIG. 4 is a schematic diagram of symbol mapping when the first PUCCH format is used in an embodiment of the present application. D0 to D4 in FIG. 4 are 5 OFDM symbols mapped to, and each symbol includes 12 subcarriers respectively.

+1 and -1 in FIG. 4 identify sequences for orthogonal spreading with a spreading factor of 2. The first sequence corresponds to a spread spectrum sequence of length 10 as [+1+1+1+1+1+1+1+1+1+1], and the second sequence corresponds to a spread spectrum sequence of length 10 as [+1+1+1+1+1+1+1+1+1+1] +1+1+1+1+1-1-1-1-1-1]. The two spreading sequences shown in FIG. 4 are an example, and in specific implementation, as long as the two spreading sequences are orthogonal spreading, it is not limited to the two spreading sequences shown in FIG. 4 .

In the embodiment of the present application, after orthogonal spreading with a spreading factor of 2 is performed, 2 users can be served.

If the terminal determines that the product M of the number of scheduled carriers and the number of downlink subframes is greater than 64 bits and not greater than 128 bits, the payload corresponding to the signal to be sent is accelerated and matched by convolution encoding to form 240 bits, and modulated to form 120 symbols , mapped to 12 subcarriers and 10 OFDM symbols corresponding to the starting position configured for the second PUCCH format, and after spreading with a spreading factor of 1, it is sent to the base station through the uplink control channel.

In this embodiment, after 240 bits are formed, interference can be added and then modulated to form 120 symbols. During specific modulation, QPSK modulation can be performed. In this embodiment, only one user can be multiplexed.

Referring to FIG. 5, FIG. 5 is a schematic diagram of symbol mapping when the second PUCCH format is used in an embodiment of the present application. D0 to D9 in FIG. 5 are 10 OFDM symbols after mapping, and each symbol contains 12 subcarriers respectively.

If the terminal determines that the product M of the number of scheduled carriers and the number of downlink subframes is not greater than 20 bits, it maps the signal to be sent to the corresponding position of the starting position configured for PUCCH format 3, and sends it to the base station through the uplink control channel. The details at this time are the same as in the existing implementation, using PUCCH format 3 to send signals, and the specific process will not be repeated here.

It can be seen from the above that, among the two PUCCH formats set in this embodiment of the present application, the first PUCCH format can support up to 64-bit payload transmission, multiplexing up to two users, and the second PUCCH format can support up to 128-bit payload transmission, with up to 128 bits of payload transmission. with a user. The system configures the sizes and starting positions of the two PUCCH formats according to different load conditions. In this way, the aggregation of up to 32 downlink carriers can be supported, and the uplink control channel only needs to be sent on the primary carrier.

To sum up, the present application configures two new PUCCH formats for supporting a payload larger than 20 bits to transmit PUCCH on the uplink main carrier, so that the bits corresponding to the HARQ-ACK of all downlink carriers can be carried.

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

Claims (3)

1. A method for transmitting an uplink control channel signal, characterized in that the method comprises: The base station configures the starting position of the format of the first physical uplink control channel PUCCH according to the load situation, and notifies the terminals served by the base station; When the terminal receives the starting position configured for the first PUCCH format notified by the base station, it stores it; When the terminal needs to send a signal, if it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is greater than 20 bits and not greater than 64 bits, the load corresponding to the signal to be sent is accelerated and matched by convolution encoding to form 120 bits. bits, and modulated to form 60 symbols, mapped to 12 sub-carriers corresponding to the starting position configured for the first PUCCH format, 5 OFDM symbols of orthogonal frequency division multiplexing technology, and positive with a spreading factor of 2 After cross-spreading, it is sent to the base station through the uplink control channel. 2. The method according to claim 1, wherein the method further comprises: The base station configures the starting position of the second PUCCH format according to the load situation, and notifies the terminals served by the base station; When the terminal receives the start position configured for the second PUCCH format notified by the base station, it stores it; When the terminal needs to send a signal, if it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is greater than 64 bits and not greater than 128 bits, the load corresponding to the signal to be sent is accelerated and matched by convolution encoding to form 240 bits. bits, and modulated to form 120 symbols, which are mapped to 12 subcarriers and 10 OFDM symbols corresponding to the starting position configured for the second PUCCH format, and after spreading with a spreading factor of 1, the uplink control channel sent to the base station. 3. The method according to claim 1 or 2, wherein the method further comprises: The base station configures the starting position of PUCCH format 3 according to the load situation, and notifies the terminals served by the base station; When the terminal receives the starting position configured for PUCCH format 3 notified by the base station, it stores it; If it is determined that the product M of the number of scheduled carriers and the number of downlink subframes is not greater than 20 bits, the signal to be sent is mapped to the corresponding position of the starting position configured for PUCCH format 3, and sent to the base station through the uplink control channel.