CN111935838B - Control information transmission method - Google Patents
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- CN111935838B CN111935838B CN202010813542.6A CN202010813542A CN111935838B CN 111935838 B CN111935838 B CN 111935838B CN 202010813542 A CN202010813542 A CN 202010813542A CN 111935838 B CN111935838 B CN 111935838B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
- G16Y10/00—Economic sectors
- G16Y10/75—Information technology; Communication
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
- G16Y40/00—IoT characterised by the purpose of the information processing
- G16Y40/30—Control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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Abstract
The invention is suitable for the field of information transmission, and provides a control information transmission method, which comprises the following steps: step S1: the first communication node uses a0 first control channel basic units to send first downlink control information to the second communication node, and sends a first downlink traffic data packet to the second communication node on the time-frequency resource indicated by the first downlink control information, step S2: the second communication node receives the first downlink control information, tries to receive the first downlink service data packet on the time-frequency resource indicated by the first downlink control information, and solves the technical problem that in a fifth generation mobile communication system, the problem to be solved is the reliable transmission of a control channel in the scene of the internet of things, and particularly in an environment with fast channel condition change, the common solution can cause the technical problem that the transmission spectrum efficiency of the control channel is low or the reliability of the control channel cannot be guaranteed.
Description
Technical Field
The invention belongs to the field of information transmission, and particularly relates to a control information transmission method.
Background
The 5G can meet diversified business requirements of people in various areas such as residence, work, leisure and traffic, and can provide extremely-sophisticated business experience such as ultra-high-definition video, virtual reality, augmented reality, cloud desktops and online games for users even in scenes with ultra-high traffic density, ultra-high connection number density and ultra-high mobility characteristics such as dense residential areas, offices, stadiums, outdoor gatherings, subways, expressways, high-speed rails and wide area coverage. Meanwhile, 5G can permeate into the fields of the Internet of things and various industries, is deeply integrated with industrial facilities, medical instruments, vehicles and the like, effectively meets the diversified business requirements of the vertical industries such as industry, medical treatment, transportation and the like, and realizes real 'everything interconnection'.
The 5G application scenarios can be divided into two broad categories, namely mobile broadband (MBB) and internet of things (IoT). Among these, the main technical requirements for mobile broadband access are high capacity, providing high data rates to meet the ever-increasing demand for data services. The internet of things is mainly driven by the requirement of machine communication (MTC), and can be further divided into two types, including low-speed Mass Machine Communication (MMC) and low-latency high-reliability machine communication. For the low-speed mass machine communication, mass nodes are accessed at a low speed, the transmitted data packets are usually small, the interval time is relatively long, and the cost and the power consumption of the nodes are usually low; for machine communication with low time delay and high reliability, the method is mainly used for machine communication with higher requirements on instantaneity and reliability, such as real-time alarm, real-time monitoring and the like.
In a fifth generation mobile communication system, a problem to be solved is the reliable transmission of a control channel in the scene of the internet of things, and particularly in an environment with fast channel condition change, a common solution may cause low transmission spectrum efficiency of the control channel or the reliability of the control channel cannot be guaranteed.
Disclosure of Invention
The invention aims to provide a control information transmission method, and aims to solve the technical problems that the reliable transmission of a control channel in the scene of the internet of things needs to be solved in a fifth-generation mobile communication system, and especially the transmission spectrum efficiency of the control channel is low or the reliability of the control channel cannot be ensured due to a common solution in an environment with fast channel condition change.
The present invention is achieved as such, a control information transmission method including the steps of:
step S1: a first communication node sends first downlink control information to a second communication node by using A0 first control channel basic units, and sends a first downlink traffic data packet to the second communication node on a time-frequency resource indicated by the first downlink control information, wherein the first control channel basic unit comprises A1 subcarriers carrying useful information and A2 subcarriers carrying demodulation reference signals, A0 is an integer greater than or equal to 4, A1 is an integer greater than or equal to 8, and A2 is an integer greater than or equal to 4;
step S2: the second communication node receives the first downlink control information, tries to receive the first downlink traffic data packet on the time-frequency resource indicated by the first downlink control information, feeds back successful receiving information to the first communication node if the first downlink traffic data packet is received, and feeds back failed receiving information to the first communication node if the first downlink traffic data packet is not received;
step S3: if the first communication node receives the successful receiving information fed back by the second communication node, the first communication node continues to use A0 first control channel basic units to send second downlink control information to the second communication node;
step S4: if the first communication node receives the reception failure information fed back by the second communication node, the first communication node uses a0/2 first control channel basic units and B0/2 second control channel basic units to send second downlink control information to the second communication node, and sends a second downlink service data packet to the second communication node on the time-frequency resource indicated by the second downlink control information, wherein the second control channel basic units include B1 subcarriers carrying useful information and B2 subcarriers carrying demodulation reference signals, B0 is an integer multiple of a0, B1 is a positive integer less than or equal to a1, and B2 is a positive integer greater than or equal to a 2;
step S5: the second communication node receives the second downlink control information, tries to receive the second downlink service data packet on the time-frequency resource indicated by the second downlink control information, feeds back successful receiving information to the first communication node if the second downlink service data packet is received, and feeds back failed receiving information to the first communication node if the second downlink service data packet is not received;
step S6: if the first communication node receives the reception success information fed back by the second communication node, when A0/2+ B0/4 is greater than or equal to A0, the first communication node transmits third downlink control information to the second communication node using A0/2 first control channel basic units and B0/4 second control channel basic units; when A0/2+ B0/4 is less than A0, then the first communications node uses A0 first control channel elements to send third downlink control information to the second communications node;
step S7: and if the first communication node receives the reception failure information fed back by the second communication node, the first communication node uses B0 second control channel basic units to send third downlink control information to the second communication node.
The further technical scheme of the invention is as follows: the power used by the second communication node for feeding back the information of successful reception is XdB greater than the power used by the second communication node for feeding back the information of failed reception, wherein the value of X is greater than or equal to 3.
The further technical scheme of the invention is as follows: the resource required for transmission of the feedback information generated by the second communication node based on the second downlink service data packet is a multiple of the resource required for transmission of the feedback information generated by the second communication node based on the first downlink service data packet, where the multiple is the sum of the number of the first control channel basic units for sending the second downlink control information and the number of the second control channel basic units/the number of the first control channel basic units for sending the first control information.
The further technical scheme of the invention is as follows: the ratio of A1 to A2 is greater than or equal to 2 and less than or equal to 4.
The further technical scheme of the invention is as follows: the ratio of B1 to B2 is greater than or equal to 0.1 and less than or equal to 2.
The further technical scheme of the invention is as follows: and the transmission power of the sub-carrier carrying the useful information in the first control channel basic unit is the same as that of the sub-carrier carrying the demodulation reference signal.
The further technical scheme of the invention is as follows: and the transmission power of the sub-carrier carrying the useful information in the second control channel basic unit is lower than the transmission power of the sub-carrier carrying the demodulation reference signal by 3 dB.
The further technical scheme of the invention is as follows: the feedback reception failure information in step S2 includes a first received signal to interference plus noise ratio of the first downlink service data packet, and the feedback reception failure information in step S5 includes a second received signal to interference plus noise ratio of the second downlink service data packet.
The further technical scheme of the invention is as follows: when the first received signal to interference plus noise ratio is greater than or equal to the second received signal to interference plus noise ratio by more than 6dB, the first communication node repeatedly transmits the third downlink control information to the second communication node by additionally using C0 second control channel basic units, wherein C0 is an integer greater than or equal to B0; when the first rssi is greater than or equal to 9dB, the first communications node repeatedly transmits the third downlink control information to the second communications node using D0 first control channel basic units, where D0 is an integer greater than or equal to 2 × a 0.
The further technical scheme of the invention is as follows: the second communication node may perform joint channel estimation among a0 first control channel elements based on the demodulation reference signal-carrying subcarriers, and the second communication node may perform independent channel estimation based on the demodulation reference signal-carrying subcarriers of each second control channel element.
The invention has the beneficial effects that: compared with the prior art, the control information transmission method solves the problem of transmission reliability of the control channel in the existing Internet of things, and improves the transmission reliability of the control channel.
Drawings
Fig. 1 is a flow chart of a control information transmission method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control channel basic unit of a control information transmission method according to an embodiment of the present invention.
Detailed Description
Fig. 1-2 illustrate a control information transmission method provided by the present invention, which includes the following steps:
step S1: a first communication node sends first downlink control information to a second communication node by using A0 first control channel basic units, and sends a first downlink traffic data packet to the second communication node on a time-frequency resource indicated by the first downlink control information, wherein the first control channel basic unit comprises A1 subcarriers carrying useful information and A2 subcarriers carrying demodulation reference signals, A0 is an integer greater than or equal to 4, A1 is an integer greater than or equal to 8, and A2 is an integer greater than or equal to 4;
step S2: the second communication node receives the first downlink control information, tries to receive the first downlink traffic data packet on the time-frequency resource indicated by the first downlink control information, feeds back successful receiving information to the first communication node if the first downlink traffic data packet is received, and feeds back failed receiving information to the first communication node if the first downlink traffic data packet is not received;
step S3: if the first communication node receives the successful receiving information fed back by the second communication node, the first communication node continues to use A0 first control channel basic units to send second downlink control information to the second communication node;
step S4: if the first communication node receives the reception failure information fed back by the second communication node, the first communication node uses a0/2 first control channel basic units and B0/2 second control channel basic units to send second downlink control information to the second communication node, and sends a second downlink service data packet to the second communication node on the time-frequency resource indicated by the second downlink control information, wherein the second control channel basic units include B1 subcarriers carrying useful information and B2 subcarriers carrying demodulation reference signals, B0 is an integer multiple of a0, B1 is a positive integer less than or equal to a1, and B2 is a positive integer greater than or equal to a 2;
step S5: the second communication node receives the second downlink control information, tries to receive the second downlink service data packet on the time-frequency resource indicated by the second downlink control information, feeds back successful receiving information to the first communication node if the second downlink service data packet is received, and feeds back failed receiving information to the first communication node if the second downlink service data packet is not received;
step S6: if the first communication node receives the reception success information fed back by the second communication node, when A0/2+ B0/4 is greater than or equal to A0, the first communication node transmits third downlink control information to the second communication node using A0/2 first control channel basic units and B0/4 second control channel basic units; when A0/2+ B0/4 is less than A0, then the first communications node uses A0 first control channel elements to send third downlink control information to the second communications node;
step S7: and if the first communication node receives the reception failure information fed back by the second communication node, the first communication node uses B0 second control channel basic units to send third downlink control information to the second communication node.
The present invention will be described in detail below with reference to embodiments by taking a base station and a terminal as examples.
Example 1
Step S1: the base station uses A0 first control channel basic units to send first downlink control information to the terminal, and sends a first downlink traffic data packet to the terminal on a time-frequency resource indicated by the first downlink control information, wherein the first control channel basic units comprise A1 subcarriers carrying useful information and A2 subcarriers carrying demodulation reference signals, A0 is an integer greater than or equal to 4, A1 is an integer greater than or equal to 8, and A2 is an integer greater than or equal to 4. The demodulation reference signal (may also be referred to as a pilot) is used for downlink channel estimation, and the terminal demodulates and decodes the useful information bits based on the downlink channel estimation result.
Step S2: the terminal receives the first downlink control information, tries to receive the first downlink traffic data packet on the time-frequency resource indicated by the first downlink control information, feeds back successful receiving information to the base station if the first downlink traffic data packet is received, and feeds back failed receiving information to the base station if the first downlink traffic data packet is not received.
Step S3: and if the base station receives the successful receiving information fed back by the terminal, the base station continues to use the A0 first control channel basic units to send second downlink control information to the terminal. This shows that the downlink channel condition between the base station and the terminal is better at present, and the base station can continue to use the original mode to send the downlink control information to the terminal.
Step S4: if the base station receives the reception failure information fed back by the terminal, the base station uses A012 first control channel basic units and B0/2 second control channel basic units to send second downlink control information to the terminal, and sends a policy second downlink service data packet to the terminal on the time-frequency resource indicated by the second downlink control information, wherein the second control channel basic unit includes B1 subcarriers carrying useful information and B2 subcarriers carrying demodulation reference signals, B0 is an integer multiple of A0, B1 is a positive integer less than or equal to A1, and B2 is a positive integer greater than or equal to A2. This means that the downlink channel condition between the base station and the terminal is degraded, the base station needs to send downlink control information in a more robust manner, and because the downlink channel between the base station and the terminal is degraded, more subcarriers are needed to perform accurate channel estimation, so each second control channel basic unit has more subcarriers to carry demodulation reference signals than the first control channel basic unit.
Step S5: and the terminal receives the second downlink control information, tries to receive the second downlink service data packet on the time-frequency resource indicated by the second downlink control information, feeds back successful receiving information to the base station if the second downlink service data packet is received, and feeds back failed receiving information to the base station if the second downlink service data packet is not received.
Step S6: if the base station receives the successful receiving information fed back by the terminal, when (A0/2+ B0/4) is greater than or equal to A0, the base station uses A0/2 first control channel basic units and B0/4 second control channel basic units to send third downlink control information to the terminal; and when (A0/2+ B0/4) is less than A0, the base station transmits third downlink control information to the terminal using A0 first control channel basic units. This scenario shows that the channel condition between the base station and the terminal becomes better, and resources required for transmitting the downlink control information can be reduced appropriately.
Step S7: and if the base station receives the reception failure information fed back by the terminal, the base station sends third downlink control information to the terminal by using B0 second control channel basic units. In such a scenario, it is indicated that the channel environment between the base station and the terminal is further deteriorated, and more resources need to be used to transmit the downlink control information, so as to ensure that the terminal can successfully receive the downlink control information.
Example 2
On the basis of the embodiment 1, the power used by the terminal for feeding back the reception success information is larger than the power used by the terminal for feeding back the reception failure information by X (db), wherein the value of X is larger than or equal to 3. The method has the advantages that the base station can successfully receive the successful receiving information fed back by the terminal, and the situation that the network performance of the internet of things is seriously influenced due to the fact that the judgment of the size of the resource used by the downlink control information sent subsequently is inconsistent between the terminal and the base station caused by the failure of receiving the feedback information is avoided.
Example 3
On the basis of embodiment 1, the resource required for the transmission of the feedback information generated by the terminal based on the second downlink service data packet is a multiple of the resource required for the transmission of the feedback information generated by the terminal based on the first downlink service data packet, where the multiple is the sum of the number of the first control channel basic units for transmitting the second downlink control information and the number of the second control channel basic units/the number of the first control channel basic units for transmitting the first downlink control information. The reason for this is that it is desirable that the resources used by the terminal to send the feedback information can match the channel variation between the base station and the terminal, for example, when the resources used by the base station to send the downlink control information become more, the resources used by the terminal to send the feedback information also become more, and vice versa, so as to ensure the reliability of the control channel communication, especially the internet of things using the time division duplex mode.
Example 4
In example 1, the ratio of a1 to a2 was 2 or more and 4 or less. This has the advantage of avoiding too few subcarriers in each first control channel element to transmit the demodulation reference signal.
Example 5
In example 1, the ratio of B1 to B2 was 0.1 or more and 2 or less. The reason for this is that the channel environment between the base station and the terminal deteriorates at this time, and therefore, it is necessary to use more subcarriers to perform prepared channel estimation, thereby increasing the probability of successful decoding of the downlink control information.
Example 6
On the basis of embodiment 1, the transmission power on the subcarriers carrying useful information and the subcarriers carrying demodulation reference signals in the first control channel basic unit is the same. The reason for this is that the quality of the downlink channel between the base station and the terminal is good in this scenario, the base station does not need to additionally increase the transmission power of the subcarrier where the demodulation reference signal is located, and the terminal can also obtain a more accurate downlink channel.
Example 7
On the basis of embodiment 1, the transmission power of the subcarriers carrying useful information in the second control channel elementary unit is 3dB lower than the transmission power on the subcarriers carrying the demodulation reference signals. The reason for this is that the quality of the downlink channel between the base station and the terminal is degraded in such a scenario, and the base station needs to additionally increase the transmission power of the subcarrier where the demodulation reference signal is located, so that the terminal can obtain a more accurate downlink channel. It should be noted that the terminal can only obtain a relatively accurate downlink channel estimation result to effectively perform demodulation and decoding of the control channel information.
Example 8
Based on embodiment 1, the feedback reception failure information in step S2 includes a first received signal to interference and noise ratio of the first downlink service data packet, and the feedback reception failure information in step S5 includes a second received signal to interference and noise ratio of the second downlink service data packet. This has the advantage that the base station can obtain more downlink channel information to better transmit the subsequent downlink control information.
Example 9
On the basis of embodiment 8, when the first received signal to interference plus noise ratio is greater than or equal to the second received signal to interference plus noise ratio 6(dB), the base station additionally uses C0 basic units of the second control channel to repeatedly send the third downlink control information to the terminal, where C0 is an integer greater than or equal to B0, and this is because the downlink channel between the base station and the terminal in this scenario becomes worse, and the base station must use additional resources to send the downlink control information to ensure the reliability of successful reception by the terminal; when the first received signal-to-interference-and-noise ratio is greater than or equal to the second received signal-to-interference-and-noise ratio by 9(dB), the base station additionally uses D0 basic units of the first control channel to repeatedly send the third downlink control information to the terminal, where D0 is an integer greater than or equal to (2 × a0), which has the advantage that when the downlink channel between the base station and the terminal becomes very bad, the base station needs more resources to transmit the downlink control information to obtain more coding gain to overcome the bad environment.
Example 10
On the basis of embodiment 1, the terminal may perform joint channel estimation among a0 first control channel basic units based on the sub-carriers carrying demodulation reference signals, and perform independent channel estimation based on the sub-carriers carrying demodulation reference signals of each second control channel basic unit. The reason for this is that the terminal can flexibly adapt to different channel environments, when the downlink channel delay of the base station and the terminal is large (generally, the channel condition is poor), the channel changes in the frequency domain relatively quickly, and it is relatively suitable to use the second control channel basic unit to transmit the downlink control information, and when the downlink channel delay of the base station and the terminal is small (generally, the channel condition is good), it is relatively suitable to use the first control channel basic unit to transmit the downlink control information.
Compared with the prior art, the control information transmission method solves the problem of transmission reliability of the control channel in the existing Internet of things, and improves the transmission reliability of the control channel.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A control information transmission method, characterized by comprising the steps of:
step S1: a first communication node sends first downlink control information to a second communication node by using A0 first control channel basic units, and sends a first downlink traffic data packet to the second communication node on a time-frequency resource indicated by the first downlink control information, wherein the first control channel basic unit comprises A1 subcarriers carrying useful information and A2 subcarriers carrying demodulation reference signals, A0 is an integer greater than or equal to 4, A1 is an integer greater than or equal to 8, and A2 is an integer greater than or equal to 4;
step S2: the second communication node receives the first downlink control information, tries to receive the first downlink traffic data packet on the time-frequency resource indicated by the first downlink control information, feeds back successful receiving information to the first communication node if the first downlink traffic data packet is received, and feeds back failed receiving information to the first communication node if the first downlink traffic data packet is not received;
step S3: if the first communication node receives the successful receiving information fed back by the second communication node, the first communication node continues to use A0 first control channel basic units to send second downlink control information to the second communication node;
step S4: if the first communication node receives the reception failure information fed back by the second communication node, the first communication node uses a0/2 first control channel basic units and B0/2 second control channel basic units to send second downlink control information to the second communication node, and sends a second downlink service data packet to the second communication node on the time-frequency resource indicated by the second downlink control information, wherein the second control channel basic units include B1 subcarriers carrying useful information and B2 subcarriers carrying demodulation reference signals, B0 is an integer multiple of a0, B1 is a positive integer less than or equal to a1, and B2 is a positive integer greater than or equal to a 2;
step S5: the second communication node receives the second downlink control information, tries to receive the second downlink service data packet on the time-frequency resource indicated by the second downlink control information, feeds back successful receiving information to the first communication node if the second downlink service data packet is received, and feeds back failed receiving information to the first communication node if the second downlink service data packet is not received;
step S6: if the first communication node receives the reception success information fed back by the second communication node, when A0/2+ B0/4 is greater than or equal to A0, the first communication node transmits third downlink control information to the second communication node using A0/2 first control channel basic units and B0/4 second control channel basic units; when A0/2+ B0/4 is less than A0, then the first communications node uses A0 first control channel elements to send third downlink control information to the second communications node;
step S7: and if the first communication node receives the reception failure information fed back by the second communication node, the first communication node uses B0 second control channel basic units to send third downlink control information to the second communication node.
2. The method according to claim 1, wherein the power used by the second communication node for feeding back the successful reception information is larger than the power used by the second communication node for feeding back the failed reception information by XdB, where X is greater than or equal to 3.
3. The method according to claim 1, wherein the resource required for the feedback information transmission generated by the second communication node based on the second downlink traffic data packet is a multiple of the resource required for the feedback information transmission generated by the second communication node based on the first downlink traffic data packet, where the multiple is a sum of a number of first control channel basic units for transmitting the second downlink control information and a number of second control channel basic units/a number of first control channel basic units for transmitting the first downlink control information.
4. The method of claim 1, wherein the ratio of A1 to A2 is greater than or equal to 2 and less than or equal to 4.
5. The method of claim 1, wherein the ratio of B1 to B2 is greater than or equal to 0.1 and less than or equal to 2.
6. The method of claim 1, wherein the transmission power of the subcarriers carrying useful information and the subcarriers carrying demodulation reference signals in the first control channel basic unit is the same.
7. The method of claim 1, wherein the transmission power of the subcarriers carrying useful information in the second control channel elementary unit is lower than the transmission power of the subcarriers carrying demodulation reference signals by 3 dB.
8. The method of claim 1, wherein the feedback reception failure information in step S2 includes a first received signal to interference and noise ratio of a first downlink traffic data packet, and the feedback reception failure information in step S5 includes a second received signal to interference and noise ratio of a second downlink traffic data packet.
9. The method of claim 8, wherein when the first SINR is 6dB or more greater than the second SINR, the first communication node repeatedly transmits the third downlink control information to the second communication node by using additional C0 second control channel basic units, wherein C0 is an integer of 0 or more; when the first rssi is greater than or equal to 9dB, the first communications node repeatedly transmits the third downlink control information to the second communications node using D0 first control channel basic units, where D0 is an integer greater than or equal to 2 × a 0.
10. The method according to claim 1, wherein the second communication node performs joint channel estimation among A0 first control channel primitives based on the demodulation reference signal-carrying subcarriers, and performs independent channel estimation based on the demodulation reference signal-carrying subcarriers of each second control channel primitive.
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