WO2009094902A1

WO2009094902A1 - Modulation mode determining method and device for communication system

Info

Publication number: WO2009094902A1
Application number: PCT/CN2009/000099
Authority: WO
Inventors: Jie Bai; Haijun Zhou; Yu Yang
Original assignee: Datang Mobile Communications Equipment Co., Ltd.
Priority date: 2008-01-23
Filing date: 2009-01-23
Publication date: 2009-08-06
Also published as: KR101150858B1; KR20100115361A; CN101494469A; CN101494469B

Abstract

A modulation mode determining method and device for a communication system. The method includes steps: setting a modulation mode adjudging condition in the communication system in advance; calculating to determine a current code rate; determining the currently needed modulation mode based on the current code rate and the modulation mode adjudging condition which is set in advance. And the adjudging condition corresponds to a code rate. The device includes: a configuration save module, for calculating to determine the current code rate; a modulation mode choosing module, for determining the currently needed modulation mode based on the current code rate and the modulation mode adjudging condition which is set in advance. Using the method, structure complexity of up-link and down-link control channels in the communication system can be reduced, and communication capability of the control channels can be improved.

Description

Method and device for determining modulation mode of communication system

Technical field

The present invention relates to mobile communication technologies, and in particular, to a modulation method and apparatus for determining a communication system. Background technique

In order to improve the data transmission capability of the mobile communication system, a Wideband-Code Division Multiple Access (WCDMA) system and a high code rate time division duplex (FCDMA) in Frequency Division Duplexing (FDD) HCR TDD, High Chip Rate Time Division Duplexing system, and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, also known as LCR TDD, low code rate time division duplex) High-speed packet access (HSPA) technology is disclosed in R6 and R7 defined by 3GPP, the third-generation mobile communication standardization organization, which mainly includes High Speed Downlink Packet Data (HSDPA) technology and High Speed Uplink Packet Data (HSUPA) technology. HSPA introduces two high-speed downlink control channels (HS-SCCH, High-Speed Shared Control Channel) and High-Speed Shared Information Channel (HS-SICH) at the physical layer to complete UE (User Information exchange between Equipment, User Equipment) and Node B (Base Station). The Node B sends the control information to the UE through the HS-SCCH, including the user identifier, the time slot resource, the code channel resource, the modulation mode, the TBS block size, and the Hybrid Automatic Repeat Request (HARQ). Information, etc. The UE feeds back the channel quality (CQI, Channel Quality Indicator) and the downlink data ACK/NACK information to the Node B through the HS-SICH.

The current HSDPA only supports QPSK (Quadature Phase Shift Keying) and 16QAM (16Quadture Amplitude Modulation). Modulation mode, Node B and UE can set an indication of a bit in HS-SCCH/HS-SICH (the meaning of "/ or" in the text) in the process of mutual communication. a field, which is used to indicate the modulation mode used by the local end (ie, QPSK or 16QAM), and the peer determines the modulation mode to be used by parsing the value of the indication field, so that the modulation modes used by the UE and the Node B are consistent. Achieve normal data communication.

In order to further improve the downlink transmission capability of the mobile communication system, 3GPP has disclosed a high-speed packet access enhancement (HSPA+, High Speed Packet Access Plus) technology in the R7 literature, including high-order 64QAM modulation, MIMO technology, and the like. If HSPA+ technology is used, it is necessary to improve the communication system that originally supported HSPA technology. However, after adding the modulation mode of 64QAM, how to indicate three different modulation modes in HS-SCCH/HS-SICH becomes an urgent problem to be solved. The current scheme is to expand the modulation mode indication information field in the original HS-SCCH/HS-SICH to two bits, so that three different modulation modes can be represented.

However, the above existing processing scheme needs to add a new bit field in the HS-SCCH/HS-SICH channel structure, which improves the complexity of the channel structure and the coding puncturing rate, and reduces the HS-SCCH/HS-SICH. The performance, and the scheme will also increase the complexity of the UE and Node B parsing processing channel structure. Summary of the invention

In view of this, the technical problem to be solved by the present invention is to provide a method for determining a modulation scheme of a communication system to reduce the complexity of the HS-SCCH/HS-SICH channel structure and improve the performance of the HS-SCCH/HS-SICH.

Another technical problem to be solved by the present invention is to provide a modulation mode determining apparatus for a communication system to reduce the complexity of the HS-SCCH/HS-SICH channel structure and improve the performance of the HS-SCCH/HS-SICH.

A further technical problem to be solved by the present invention is to provide a modulation method for determining another communication system, so as to reduce the complexity of the HS-SCCH/HS-SICH channel structure and improve Performance of HS-SCCH/HS-SICH.

In order to achieve the above object, the main technical solution of the present invention is:

A method for determining a modulation mode of a communication system, in which a modulation mode determination condition corresponding to a code rate is set in advance in the communication system; when determining a modulation mode currently to be used, the method includes:

A. Calculate and determine the current code rate;

B. Determine the current modulation mode according to the current code rate and the preset modulation mode determination condition.

A modulation method determining device for a communication system, the device comprising:

a configuration saving module, configured to save a set modulation mode determination condition corresponding to a code rate; a code rate calculation module, configured to calculate and determine a current code rate;

The modulation mode selection module is configured to determine a modulation mode currently to be used according to the current code rate and the set modulation mode determination condition.

A method for determining a modulation mode of a communication system, wherein the method does not specify a bit for indicating a modulation mode in a channel structure of the control channel; and when the user equipment determines a modulation mode currently to be used, respectively, according to different modulation modes The symbols of the physical dedicated shared channel are demodulated, and the demodulation results are respectively determined, and the modulation mode corresponding to the correct demodulation result is selected as the current modulation mode to be used. Since the present invention pre-sets the correspondence between the code rate and the modulation mode, the implicit calculation can obtain the code rate and then find the correspondence according to the code rate to determine the modulation mode currently used by the communication peer, so Some HS-SCCH/HS-SICH channel structure fields can indicate three modulation modes by using only one current bit; further, the present invention can also streamline the existing HS-SCCH/HS-SICH channel. The structure can achieve the purpose of indicating the modulation mode without using any bit, completely determine the modulation mode by calculating the code rate, or completely determine the modulation mode by blind demodulation, thereby reducing the complexity of the channel structure and the coding after punching. Rate, improve the performance of HS-SCCH/HS-SICH, and also greatly optimize the processing of HS-SCCH/HS-SICH channel structure by UE and Node B, and improve the processing efficiency at both ends of communication. After the communication system is upgraded to HSPA+, the information bits of the HS-SCCH/HS-SICH can be increased or decreased without using the scheme of the present invention. For the UE, the complexity of parsing the HS-SCCH can be minimized, and the HS-SCCH can be improved. At the same time, for Node B, it is also possible to minimize the complexity of resolving HS-SICH and improve the performance of HS-SICH. DRAWINGS

1 is a specific flowchart of determining a modulation mode by setting a code rate threshold according to the present invention; FIG. 2 is a flowchart of determining a modulation mode by setting a mapping relationship between a code rate and a signal to noise ratio according to the present invention;

FIG. 3 is a schematic structural diagram of a modulation mode determining apparatus of a communication system according to the present invention. detailed description

The present invention will be further described in detail below by way of specific embodiments and the accompanying drawings.

The main idea of the invention is to indicate multiple modulation modes with only one bit or even no bits. As an embodiment of the present invention, a modulation mode determination condition corresponding to a code rate may be set in advance in a communication system. When it is necessary to determine a modulation mode currently to be used, first determine a current code rate, and then according to a current code rate and The preset modulation mode determination condition determines the modulation mode currently to be used. Alternatively, alternatively, in other embodiments of the invention, the modulation scheme may be determined entirely by blind demodulation. The description is made, but these examples are not intended to limit the invention.

Embodiment 1: In this embodiment, the channel structure of the existing HS-SCCH/HS-SICH is not changed, and an explicit 1 bit field is still used to indicate the modulation mode, where 1 still represents the modulation mode of 16QAM, but The difference in technique is that the modulation method represented by 0 in this embodiment is QPSK or 64QAM. When the UE or the Node B determines the modulation mode that is currently required to be used, that is, when determining the modulation mode currently used by the peer end, first determining the modulation mode indication information in the HS-SCCH/HS-SICH. If the value is 1, the current modulation mode is 16QAM. If the value is 0, the current modulation mode is QPSK or 64QAM by the following method, so as to avoid QPSK and 64QAM. The modulation scheme of the TBS block in the overlap region is misunderstood by the UE.

Method 1: Set a threshold threshold (Threshold) in the physical layer of the communication module of the UE and the Node B. The threshold of the code rate may be a code rate value in the QPSK modulation mode (that is, a QPSK code rate), or may be a 64QAM modulation mode. The code rate value (ie, 64QAM code rate), since the conversion method of QPSK code rate and 64QAM code rate is fixed, any one of the two can be used, as long as the corresponding code rate value is converted into The code rate value in the same modulation mode can be used. For example, this can be set to the QPSK code rate threshold. When the modulation mode indication information in the HS-SCCH/HS-SICH takes a value of 0, further determining and determining the QPSK code rate; and then determining whether the QPSK code rate exceeds a preset QPSK code rate threshold, and if yes Determine the current modulation mode as 64QAM. Otherwise, determine the current modulation mode as QPSK. For example, Table 1 shows an example of a specific modulation method determination.

Table 1

In a preferred embodiment of the present invention, the default value of the QPSK threshold is 1, that is, QPSK can support a code rate of 1, that is, when the QPSK code rate exceeds 1, the current modulation mode is determined to be 64QAM, otherwise the current modulation mode is determined. For QPS.K.

Alternatively, optionally, as another embodiment of the present invention, a 64QAM code rate threshold may also be set in the physical layer, and if the modulation mode indication information in the HS-SCCH/HS-SICH takes a value of 0, the calculation is further determined. The 64QAM code rate (the specific calculation and determination method may adopt an existing method), and then determine whether the 64QAM code rate is higher than a preset 64QAM code rate threshold. If it is higher, the current modulation mode is determined to be 64QAM. Otherwise, determine the current modulation mode as QPS:. Also, in a preferred embodiment of the invention, the default value of the 64QAM threshold is about 1/3. FIG. 1 is a specific flowchart of determining the modulation mode by setting a code rate threshold in the first embodiment. ^ See FIG. 1, for example, three modulation modes are included in this embodiment, for example, a first modulation mode (QPSK), a second modulation mode (16QAM), and a third modulation mode (64QAM), but

It is not to say that the present invention can only adopt the above three modulation methods.

use. The process includes:

Steps 101 to 102: determining the value of the modulation mode indication bit in the HS-SCCH/HS-SICH. If the value is 1, determining that the current modulation mode is 16QAM (second modulation mode), and ending the process; 0, then step 103 is performed. In the present invention, the UE determines the modulation mode indication bit of the HS-SCCH, and the Node B determines the modulation mode indication bit in the HS-SICH.

Step 103: Calculate and determine a current code rate value. For the UE, the current code rate is calculated according to the number of timeslots, the number of code channels, and the TBS size that are sent by the ode B through the HS-SCCH. For the Node B, the size of the RTBS in the CQI reported by the UE through the HS-SICH, and The current code rate is calculated by the maximum number of slots and the number of code channels corresponding to the capability level information of the UE.

Step 104 - Step 106: Compare whether the current code rate (for example, the QPSK code rate has been converted here) is smaller than the code rate threshold (assuming the QPSK code rate threshold here), and if yes, determine that the current modulation mode is QPSK (first modulation mode); otherwise, it determines the current modulation mode is 64QAM (third modulation mode).

Method 2: Configuring QPSK code rate and 64QAM code rate and signal-to-noise ratio (beta) in the NodeB Application Protocol (NBAP) signaling and Radio Resource Control (RC) signaling of the upper layer of the communication module respectively After the UE receives the modulation mode indication information with a value of 0, it calculates and determines the QPSK code rate and the 64QAM code rate according to the two modulation modes, and then searches for the letter corresponding to the QPSK code rate from the mapping relationship. The signal-to-noise ratio beta2 corresponding to the noise ratio and the 64QAM code rate compares betal and beta2, and selects the modulation mode corresponding to the smaller one to be the currently used modulation mode.

FIG. 2 is a schematic diagram of determining a modulation mode by setting a mapping relationship between a code rate and a signal to noise ratio according to an embodiment of the present invention; A flow chart. See Figure 2, including:

Step 201 - Step 202: Determine the value of the modulation mode indication bit in the HS-SCCH/HS-SICH. If the value is 1, determine that the current modulation mode is 16QAM, and the process ends; if it is 0, execute step 203. .

Step 203: Calculate and determine a current QPSK code rate and a 64QAM code rate.

Step 204: Determine, according to the mapping relationship, a signal-to-noise ratio (beta) corresponding to a QPSK code rate and a signal-to-noise ratio (beta2) corresponding to a 64QAM code rate.

Step 205: Select a modulation mode corresponding to the smaller one of beta and beta2 as the currently used modulation mode.

Embodiment 2: With respect to the first embodiment, the embodiment does not need to indicate the bit in the channel structure, but needs to change the channel structure of the HS-SCCH and the HS-SICH, and remove the modulation mode indication field, that is, does not occupy the HS- The bits of the channel structure of the SCCH and HS-SICH are modulated by the modulation mode indication (ie, Obit), and the modulation mode information is indicated using a completely implicit method. The specific method can also include the following two types:

Method I: setting a code rate conversion point of the three modulation modes at a physical layer, that is, setting two code rate conversion points, for example, BR1 and BR2, and dividing the value range of the code rate into three segments, each segment of value range Corresponding to a modulation method, for example, as described in Table 2:

Table 2

The unit of the code rate conversion point may be any one of the three modulation mode code rates, and if the code rate units are different in subsequent comparison, the code rate of the same modulation mode may be converted. The better schemes are normalized to compare the code rates under 64QAM.

When the UE or the Node B needs to determine the modulation mode, first determine the current code rate (assuming that the code rate conversion point is a 64QAM code rate, then the current code rate needs to be converted to a 64QAM code rate). The value range of the 64QAM code rate falls within the range of the modulation mode. The corresponding modulation method is used as the current modulation method.

Method II: The mapping relationship between the code rate and the signal-to-noise ratio of the QPSK, 16QAM, and 64QAM modulation modes is respectively configured in the BAP and R C signaling of the communication module of the UE and the Node B.

When the UE or the Node B needs to determine the modulation mode, first calculate the code rates in the three modulation modes of QPSK, 16QAM, and 64QAM, that is, the QPSK code rate, the 16QAM code rate, and the 64QAM code rate, and then according to the configured reference code rate. The signal-to-noise ratio (SNR) mapping is obtained by linear difference operation to obtain the signal-to-noise ratio (beta) and beta II. beta III corresponding to the three code rates. Finally, the smaller one of the beta l, beta II, and beta III is selected. The modulation method is the modulation method currently used.

In the second embodiment, since the channel structure of the original HS-SCCH/HS-SICH is changed, the original channel structure is simplified, and a new channel structure is obtained. Therefore, when receiving the HS-SCCH/HS-SICH, the UE and the Node B need to distinguish whether the HS-SCCH/HS-SICH adopts the original channel structure or the simplified channel structure, if the HS-SCCH/HS- is determined. The SICH is a method of performing the first embodiment by using the original channel structure. If it is determined that the HS-SCCH/HS-SICH adopts a new channel structure, the method of the second embodiment is performed. There are two main methods for distinguishing judgments:

Differentiating the judgment method 1: It includes how the UE knows the HS-SCCH channel structure type used by the Node B, and how the Node B knows the HS-SICH channel structure type used by the UE. The specific methods are as follows A) and B).

A) The method for the UE to know the type of the HS-SCCH channel structure used by the Node B is as follows: The network side determines the HS-SCCH to be used according to the capability information of the UE (the capability information can be reported by the UE to the network side by using the existing method) The channel structure type, if the capability of the UE does not support the modulation mode of the 64QAM, the original HS-SCCH channel structure is adopted, that is, the modulation mode information is indicated by using the lbit, and if the capability of the UE can support the modulation mode of the 64QAM, the original mode is adopted. HS-SCCH channel structure (containing bits for indicating modulation mode information) or new HS-SCCH channel structure (ie, no bits for indicating modulation mode information); then, the network side notifies in RRC signaling The HS-SCCH channel structure type adopted by the UENode B; the UE knows the HS-SCCH channel structure type adopted by the Node B by parsing the RRC signaling, and if it is resolved, the original HS-SCCH signal is used. The track structure is processed by the method described in the first embodiment, and if the analysis is known to adopt a new one.

The HS-SCCH channel structure is processed by the method described in Embodiment 2 above.

B) The method for the Node B to learn the type of the HS-SICH channel structure used by the UE is specifically as follows: The Node B may determine the type of the HS-SICH channel structure used by the UE according to the capability information of the UE, if the capability of the UE does not support the modulation of the 64QAM. In the mode, the UE is determined to use the original HS-SICH channel structure, that is, the lbit is used to indicate the modulation mode information, in which case the Node B processes in the original manner; if the capability of the UE can support the modulation mode of the 64QAM, the UE determines The UE adopts a new HS-SICH channel structure, that is, does not include a bit for indicating the modulation mode information. In this case, the Node B performs the method in the second embodiment.

Differentiating judgment method 2: This includes how the UE knows the HS-SCCH channel structure type used by the ode B, and how the Node B knows the HS-SCCH/HS-SICH channel structure type used by the UE. The specific methods are as follows a) and b).

a) The method for the UE to know the type of the HS-SCCH channel structure used by the Node B is: The Node B determines the type of the HS-SCCH channel structure to be used according to the capability information of the UE. If the capability of the UE does not support the modulation mode of the 64QAM, The original HS-SCCH channel structure is adopted, that is, the modulation mode information is indicated by using lbit. If the capability of the UE can support the modulation mode of 64QAM, the original HS-SCCH channel structure (containing the bit for indicating the modulation mode information) is adopted. ) or a new HS-SCCH channel structure (ie, without bits for indicating modulation mode information); but unlike A) above, the network does not inform the UENode B of the HS-SCCH type used, and After the UE demodulates the HS-SCCH, the UE determines the HS-SCCH type used by the Node B by blind decoding. Specifically, the blind decoding is performed according to different rate matching modes corresponding to the new HS-SCCH channel structure and the original HS-SCCH channel structure, that is, the rate matching is performed according to different rate matching modes, and then separately performed. The HS-SCCH channel structure corresponding to the decoding and decoding is the HS-SCCH channel structure adopted by the Node B. After the UE learns the HS-SCCH channel structure adopted by the Node B, it processes the case separately. If the original HS-SCCH channel structure is used, the method described in the first embodiment is used, if a new HS- is adopted. SCCH channel The structure is processed by the method of the second embodiment described above.

b) The method for the Node B to learn the type of the HS-SICH channel structure used by the UE is the same as the above B), and details are not described herein again.

In addition, in another solution of the present invention, it is also required to change the channel structure of the HS-SCCH and the HS-SICH, and remove the modulation mode indication field, that is, the bits of the channel structure that do not occupy the HS-SCCH and the HS~SICH are modulated. The mode indication (ie, 0 bit) uses a completely implicit method to indicate the modulation mode information, but the upper layer of the communication does not configure the mapping relationship between the code rate and the beta in various modulation modes, and the code rate of various modulation modes is not set in the physical layer. The switching point is used by the UE to demodulate the symbols of the high-speed physical dedicated shared channel (HS-PDSCH) by blind demodulation, that is, the HS-PDSCH symbols are demodulated according to different modulation modes, and the respective judgments are respectively performed. Demodulate the result and select the modulation method corresponding to the correct demodulation. Due to this processing embodiment, also because of the addition of the new HS-SCCH/HS-SICH structure, the UE and the Node B need to adopt the original HS-SCCH/HS-SICH when receiving the HS-SCCH/HS-SICH. The channel structure is also distinguished by the simplified channel structure. The specific method is the same as the corresponding method in the second embodiment, and details are not described herein.

FIG. 3 is a schematic structural diagram of a modulation mode determining apparatus of a communication system according to the present invention. The device is also set in the network side Node B and UE of the communication system. See Figure 3. The device includes:

The configuration saving module 301 is configured to save the set modulation mode determination condition information corresponding to the code rate.

The code rate calculation module 302 is configured to calculate and determine a current code rate.

The modulation mode selection module 303 is configured to determine a modulation mode currently to be used according to the current code rate and the set modulation mode determination condition.

In an embodiment of the modulation mode determining apparatus, the configuration saving module is disposed in a physical layer of the communication system, and the modulation mode determining condition information corresponding to the code rate saved in the configuration saving module is: different Different code rate ranges corresponding to the modulation method. The modulation mode selection module specifically includes: a search module, configured to search for a code rate range in which the current code rate falls; a modulation mode determining module, configured to search for a modulation mode corresponding to the code rate range, and use the modulation mode as a current Modulator Style.

In another embodiment of the modulation mode determining apparatus, the configuration saving module is disposed in a physical layer of the communication system, and the modulation mode determination condition information corresponding to the code rate saved in the configuration saving module is: The mapping relationship between the code rate and the signal-to-noise ratio in the modulation mode. This mapping relationship is notified to the configuration saving module by the upper layer. The code rate calculation module specifically includes one or more specific modulation mode code rate calculation modules, which are respectively used to determine a current code rate in each specific modulation mode; the modulation mode selection module specifically includes: a search and calculation module, configured to search Determining, by the mapping relationship, a signal to noise ratio corresponding to a current code rate in each modulation mode; a comparison module, configured to compare the signal to noise ratio, and using a modulation mode corresponding to a minimum signal to noise ratio as a current modulation to be used the way.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope of the present invention. All should be covered by the scope of the present invention.

Claims

Claim

A method for determining a modulation mode of a communication system, characterized in that a modulation mode determination condition corresponding to a code rate is set in advance in a communication system; and when determining a modulation mode currently to be used, the method includes:

A. Calculate and determine the current code rate;

B. Determine a modulation mode currently to be used according to the current code rate and the preset modulation mode determination condition.

2. The method of claim 1 wherein

The setting manner of the modulation mode corresponding to the code rate is specifically: setting a code rate conversion point, the code rate is divided into different code rate ranges by the code rate conversion point, and different code rate ranges are corresponding to different modulation modes;

The step B is specifically: searching for a code rate range in which the current code rate falls, and using a modulation mode corresponding to the code rate range as a current modulation mode to be used.

3. The method of claim 1 wherein:

The setting condition of the modulation mode corresponding to the code rate is specifically: setting a mapping relationship between a code rate and a signal to noise ratio in different modulation modes;

Determining, in step A, the current code rate in the various modulation modes;

The step B is specifically: searching the mapping relationship, obtaining a signal to noise ratio corresponding to a current code rate in each modulation mode, comparing the signal to noise ratio, and using a modulation mode corresponding to a minimum signal to noise ratio as a current need to use Modulation.

The method according to claim 1, wherein the modulation mode to be determined includes a first modulation mode, a second modulation mode, and a third modulation mode, and further includes:

Parsing corresponding bits in the channel structure of the control channel;

If the corresponding bit is 1, the second modulation mode is used as the modulation mode currently to be used;

If the corresponding bit is 0, further according to the current code rate and the preset modulation mode The determination condition determines whether the modulation mode currently to be used is the first modulation mode or the third modulation mode.

The method according to claim 4, wherein the determining whether the currently used modulation mode is the first modulation mode or the third modulation mode according to the current code rate and the preset modulation mode determination condition comprises:

Comparing the current code rate with the preset modulation mode determination condition;

If the current code rate is greater than or equal to the preset modulation mode determination condition, the third modulation mode is used as a modulation mode currently to be used;

If the current code rate is less than the preset modulation mode determination condition, the first modulation mode is used as the modulation mode currently to be used.

The method according to claim 5, wherein the preset modulation mode determination condition is a code rate threshold in a third modulation mode, or the preset modulation mode determination condition is a first modulation mode The code rate is lower.

The method according to any one of claims 4-6, wherein the first modulation mode is QPSK, the second modulation mode is 16QAM, and the third modulation mode is 64QAM.

The method according to claim 7, characterized in that the code rate threshold under 64QAM is about 1/3, or the code rate threshold under QPSK is 1.

9. The method according to claim 1, wherein the calculating the current code rate comprises:

For the user equipment UE, calculate the current code rate according to the number of slots and the number of code channels;

For the base station, the recommended transport block size RTBS size is used to calculate the current code rate.

The method of claim 1, 2, 3 or 4, wherein the communication system is a high speed packet access enhanced HSPA+ system, and the control channel is a high speed downlink control channel and a high speed uplink control channel.

A modulation mode determining apparatus for a communication system, the device comprising: a configuration saving module, configured to save a modulation mode determination condition corresponding to a set code rate; and a code rate calculation module, configured to calculate and determine a current code rate ; The modulation mode selection module is configured to determine a modulation mode currently to be used according to the current code rate and the set modulation mode determination condition.

The device according to claim 11, wherein the setting condition of the modulation mode saved in the configuration saving module is: different code rate ranges corresponding to different modulation modes;

And the modulation mode selection module specifically includes: a searching module, configured to search for a code rate range in which the current code rate falls; and a modulation mode determining module, configured to search for a modulation mode corresponding to the code rate range and use the modulation mode as Modulation is currently required.

13. The apparatus according to claim 12, wherein the configuration saving module is disposed in a physical layer of the communication system.

The device according to claim 11, wherein the modulation mode determining condition corresponding to the code rate saved in the configuration saving module is: a mapping relationship between a code rate and a signal to noise ratio in different modulation modes;

The code rate calculation module specifically includes one or more specific modulation mode code rate calculation modules, which are respectively used to determine a current code rate in each specific modulation mode;

The modulation mode selection module specifically includes: a search calculation module, configured to search the mapping relationship, and calculate a signal to noise ratio corresponding to a current code rate in each modulation mode; and a comparison module, configured to compare the signal to noise ratio, to The modulation mode corresponding to the minimum signal-to-noise ratio is used as the modulation mode currently used.

The device according to claim 14, wherein the configuration saving module is disposed in a physical layer of the communication system, wherein the mapping relationship is notified to the configuration saving module by a high layer of the communication system.

A method for determining a modulation mode of a communication system, wherein the method does not specify a bit for indicating a modulation mode in a channel structure of the control channel; and when the user equipment determines a modulation mode currently to be used, respectively Different modulation methods demodulate the symbols of the high-speed physical dedicated shared channel, respectively determine the demodulation result, and select the modulation mode corresponding to the correct demodulation result as the current modulation mode to be used.

The method according to claim 16, wherein the method further comprises: determining, by the network side of the communication system, a channel structure of a control channel used by the network side and the user equipment according to the capability information of the user equipment; The network side notifies the user equipment of the channel structure of the control channel used by the network side through high layer signaling.

The method according to claim 16, wherein the method further comprises: determining, by the network side of the communication system, a channel structure of the control channel used by the network side and the user equipment according to the capability information of the user equipment; The rate matching mode of the structure performs blind decoding on the control channel used by the network side, and determines the channel structure of the control channel used by the network side according to the blind decoding result.