TWI689189B - Wireless access method, wireless receiving method for a communication system and a base station therefor - Google Patents

Abstract

A wireless access method for a communication system adapted to a base station is provided. The wireless access method includes the following steps. A first control message is transmitted through a first frequency band. A second control message is transmitted through a second frequency band. The time difference between the transmission time points of the first control message and the second control message is less than a slot time, and the first frequency band is different from the second frequency band.

Description

Wireless access method, wireless receiving method and application of communication system Base station using the wireless access method and wireless receiving method

The invention relates to a wireless access method, a wireless receiving method of a communication system, and a base station applying the same.

In order to respond to the current Internet of Things (IoT) and smart city applications, in recent years, mobile communication has been applied to the communication between things in addition to the communication between people. As we all know, 5G technology standards have three main directions, including Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC), and ultra-high reliability and low-latency communications (Ultra- reliable and low latency communications (URLLC), of which URLLC is mainly used in low latency (unmanned vehicles, industrial process automation, remote surgery, Tactile internet), etc. And high reliability (High Reliability) requirements.

In order to shorten the time delay, the overall transmission time can be reduced by reducing the slot duration to maintain the same frame structure. Therefore, compared with the 15KHz subcarrier spacing of Long Term Evolution (LTE), the next generation considers using a larger subcarrier spacing to achieve the effect of shortening the time slot length. Using a larger carrier spacing can reduce the time slot interval and further achieve a lower time delay. However, when the subcarrier spacing becomes larger, the effect of multipath attenuation will be more serious, so it is easy to cause the problem of inter-symbol interference, which leads to a decrease in system performance. Moreover, the increased subcarrier spacing will also lead to an increase in the minimum bandwidth, and increase the hardware complexity of the transceiver device, which will increase the hardware cost of the transceiver device.

Therefore, it is one of the directions that the industry is devoted to how to meet the requirements of low time delay for the technology of the 5G standard while taking into account that the system complexity is not too high.

According to the first aspect of the present invention, a wireless access method for a communication system is proposed. This wireless access method includes the following steps. A transmitting end transmits a first control message via a first frequency band. The transmitting end transmits a second control message via a second frequency band. Wherein, the time difference between the transmission time points of the first control message and the second control message is less than one slot time, and the first frequency band and the second frequency band are different.

According to the second aspect of the present invention, a wireless receiving method of a communication system is proposed, including the following steps. A receiving end sequentially monitors a first control message and a second control message to monitor whether the first control message and the second control message are the control messages required by the receiving end, and if so, the receiving end decodes the data to receive the corresponding Control message. its Among them, the first control message is transmitted through the first frequency band, and the second control message is transmitted through the second frequency band. The time difference between the transmission time points of the first control message and the second control message is less than one slot time, and the first frequency band and the second frequency band are different.

According to a third aspect of the present invention, a base station is proposed. The base station includes a transmission schedule selection module and a transmission module. The transmission module is electrically connected to the transmission schedule selection module, and under the control of the transmission schedule selection module, transmits a first control message through a first frequency band and transmits a second through a second frequency band Control messages. Wherein, the time difference between the transmission time points of the first control message and the second control message is less than one slot time, and the first frequency band and the second frequency band are different.

In order to have a better understanding of the above and other aspects of the present invention, the following examples are specifically described in conjunction with the accompanying drawings as follows:

100: Communication application system

102: Sensor

104: Teleporter

106: Internet

108: receiver

110: actuator

S1~S4: Signal

T1~T5: time

202(1), 202(2): time slot

204: Orthogonal Frequency Division Multiplexing (OFDM) symbol

t1~t15: time point

Twt: waiting time

Ttr: transmission time

Tdp: time delay

402, 402, 702, 704, 706: process steps

502(1)~502(4): Candidate transmission settings

502’(1)~502’(4): uplink candidate transmission settings

502”(1)~502”(4): downlink candidate transmission settings

Bw1~Bw4: frequency band

C(1): the first control message

C(2): Second control message

TD(1), TD(2), TD(3): time difference

P(1): the first packet

P(2): second packet

St1(1), St1(2): time slot of the first frequency band

St2(1): second time slot

St3(1): time slot of the third frequency band

Bos1~Bos4: Time slot boundary offset

Slt1(1)~Slt1(5), Slt2(1)~Slt2(4), Slt3(1)~Slt3(4), Slt4(1)~Slt4(4), Slt5(1)~Slt5(3), Slt6(1), Slt7(1), Slt3'(1), Slt2”(1): time slot

Tnp: network processing time

Figure 1 shows a schematic diagram of an example of a mission-critical machine-type communication application.

Figure 2 is a schematic diagram of the time delay when the frame is transmitted.

Figure 3 shows the slot length, mini slot length and OFDM symbol time corresponding to different extended parameter sets.

FIG. 4 shows a flowchart of a wireless access method of a communication system according to an embodiment of the disclosure.

FIG. 5 is a schematic diagram illustrating an example of a wireless access method for implementing the communication system of FIG. 4.

FIG. 6 is a schematic diagram illustrating another example of implementing the wireless access method of the communication system of FIG. 4.

FIG. 7A is a flowchart illustrating a further example of a wireless access method for implementing the communication system of FIG. 4.

FIG. 7B is a schematic diagram illustrating a further example of a wireless access method for implementing the communication system of FIG. 4.

FIG. 8 is a schematic diagram showing an example of a signal received by a receiving end using the wireless access method of FIG. 4.

FIG. 9 is a schematic diagram illustrating an example in which a user equipment using the wireless access method of FIG. 4 transmits a packet using a non-promised transmission method or a promised transmission method.

FIG. 10 is a schematic diagram showing an example of pre-scheduled packet transmission using the wireless access method of FIG. 4.

FIG. 11 shows an example of a block diagram of a base station applying the wireless access method of the disclosed embodiment of FIG. 4.

Low Latency (Low Latency) system is one of the key development points of 5G system in the future. Its specification will be to make the total time from transmission to reception less than 1ms to shorten the communication connection time. This is because in many future applications, the radio access time will be shorter. For example, Mission-critical Machine Type Communications (MTC) applications, the required wireless access time is less than 100 μs. Mission-critical machine-based communication applications are, for example, telemedicine surgery, perception networks, industrial automation, etc.

Please refer to FIG. 1, which is a schematic diagram of an example of a mission-critical machine-type communication application. Assume that the system 100 for mission-critical machine communication applications includes a sensor 102, a transmitter 104, a receiver 108, and an actuator 110. The system 100 communicates with the network 106. After the sensor 102 senses the signal, the signal S1 is generated and the corresponding wireless signal S2 is transmitted to the network 106 via the transmitter 104. After the network 106 processes the relevant program, the network 106 returns the wireless signal S3 to the receiver 108, and the receiver 108 generates a corresponding signal S4 and sends it to the actuator 110. The time from the time when the sensor 102 outputs the signal S1 to the time when the transmitter outputs the signal S2 is T1, and the time when the wireless signal S2 is transmitted to the network 106 is T2, and the network 106 needs to perform the corresponding processing The time is T3. The time for the wireless signal S3 to be transmitted from the network 106 to the receiver 108 is T4. The time for the receiver 108 to receive the signal S3 and output the signal S4 to the actuator 110 is T5. If the total time from transmission to reception (that is, the sum of T1+T2+T3+T4+T5) is less than 1ms, then T2 and T4 need to be less than 100μs (assuming that T3 is about 500μs and T1+T5 is about 300μs). How to make T2 and T4 need to be less than 100μs respectively, so that the device receiving the wireless signal (such as the actuator 110) has more time to process, such as processing the information transmitted by the sensor 102, that is One of the objectives to be achieved in this embodiment.

In the slot-based transmission method, frame transmission time and waiting time are two key factors that affect the time delay at the fundamental frequency. Please refer to FIG. 2, which is a schematic diagram of the time delay when the frame is transmitted. Suppose that each time slot 202 (for example, time slots 202(1) and 202(2)) includes 14 orthogonal frequency-division multiplexing (OFDM) symbols 204. If the data is ready and transferable at time t1 other than the starting point of time slot 202(1), the data must wait After the time length Twt, it can be transmitted to the beginning of the next time slot 202(2), and the time required for transmission is time Ttr. As such, the time delay Tdp is equal to the sum of the waiting time Twt and the transfer time Ttr.

Please refer to FIG. 3, which shows the slot length, mini slot length and OFDM symbol time corresponding to different extended parameter sets (Numerology). The extended parameter set represents Sub-Carrier Spacing (SCS). When the SCS is equal to 240kHz, the time of each OFDM symbol is 4.46μs. Since there are 14 OFDM symbols in each time slot, the time slot length is equal to 62.43μs (=4.46μs*14), and the maximum waiting time Twt is one The time slot length is equal to 62.43μs. However, the maximum time delay Tdp (=maximum waiting time Twt+transmission time Ttr) is 62.43μs+62.43μs=124.86μs. Therefore, when the SCS is equal to 240kHz, the time slot using 14 OFDM symbols still cannot meet the requirement that the delay time is less than 100μs.

If SCS is equal to 60kHz and the mini slot is used, each OFDM symbol time is 17.84μs. Since each mini slot has 4 OFDM symbols in total, the mini slot length is equal to 71.35μs (=17.84μs*4), and the maximum waiting time Twt is the length of one mini slot, which is 71.35μs. However, the maximum time delay Tdp (=maximum waiting time Twt+transfer time Ttr) is still 71.35μs+71.35μs=142.7μs. Therefore, when the SCS is equal to 60kHz, the use of 4 OFDM symbol mini-slots still cannot meet the delay time of less than 100μs.

Although it is possible to shorten the time slot length by modifying the extended parameter set and using a larger carrier spacing to shorten the waiting time Twt and reduce the frame transmission time Ttr. However, this approach has the following disadvantages: (1) The occupied bandwidth becomes larger, especially in Below sub-6GHz (for example, SCS is less than 60kHz), it is difficult to find resources with large bandwidth in certain frequency bands; (2) At this stage, it is difficult to implement millimeter-wave RF technology, and the circuit design is difficult, which makes the transceiver’s The cost becomes higher; (3) The larger extended parameter set is susceptible to multi-path attenuation of wireless communication, which reduces the quality of wireless communication. Therefore, how to avoid the above-mentioned shortcomings and meet the requirement of delay time less than 100 μs is one of the problems to be solved in this disclosure.

In order to solve the above problems, the present disclosure proposes a wireless access method for a communication system. Please refer to FIG. 4, which illustrates a flowchart of a wireless access method of a communication system according to an embodiment of the present disclosure. A wireless access method of a communication system according to an embodiment of the present disclosure is applicable to a base station. This wireless access method includes the following steps. In step 402, a first control message is transmitted via a first frequency band. In step 404, a second control message is transmitted via a second frequency band. The time difference between the transmission time points of the first control message and the second control message is less than a slot time, and the first frequency band and the second frequency band are different.

In the method of the present disclosure described above, by transmitting the first control message and the second control message to be transmitted through the first frequency band and the second frequency band, respectively, and the transmission time of the first control message and the second control message The time difference between the points is less than the slot time, so that the delay between two adjacent control messages can be less than one slot time. In this way, the waiting time can be effectively reduced.

Please refer to FIG. 5, which is a schematic diagram of an example of implementing the wireless access method of the communication system of FIG. 4. In step 402, a transmitting end transmits the first control message C(1) via the first frequency band Bw1. In step 404, the transmitting end passes the second frequency band Bw2 Send the second control message C(2). The time difference TD(1) between the transmission time points of the first control message C(1) and the second control message C(2) is less than a time slot time, such as the time slot time St1(1) of the first frequency band Bw1 or the second frequency band The slot time of Bw2 is St2(1), and the first frequency band Bw1 and the second frequency band Bw2 are different.

Wherein, the step 402 of transmitting the first control message C(1) through the first frequency band Bw1 may further include the step of generating a first packet P(1) and a first frequency band that is not occupied in the first frequency band Bw1 The start time of the time slot St1(1) and the start time of a second band time slot St2(1) that is not occupied in the second frequency band Bw2, select the first frequency band time slot St1( 1) The step of transmitting the first packet P(1). The first packet P(1) includes the first control message C(1).

The step 404 of transmitting the second control message C(2) via the second frequency band Bw1 may further include the step of generating a second packet P(2), and another unoccupied one according to the first frequency band Bw(1) The start time of the first band time slot St1(2) and the start time of the unoccupied second band time slot St2(1) in the second frequency band Bw2, select the second band time slot via the closer start time St2(1) transmits the second packet P(2). The second packet P(2) includes the second control message C(2).

Please refer to FIG. 6, which is a schematic diagram of another example of implementing the wireless access method of the communication system of FIG. 4. The step 402 of FIG. 4 for transmitting the first control message C(1) via the first frequency band Bw1 may further include the step of generating the first packet P(1), and when the first frequency band is not occupied in the first frequency band Bw1 The start time of the slot St1(1), the start time of the unoccupied second band time slot St2(1) in the second band Bw2 and the unoccupied third band time slot St3(1 in the third band Bw3 ), select the first The step of transmitting the first packet in a time slot St1(1). The time difference TD(3) between the start time of the third band time slot St3(1) and the start time of the first band time slot St1(1) is less than one time slot, and the third band time slot St3(1 ) The time difference TD(2) between the start time of) and the start time of the time slot St2(1) of the second frequency band is less than one time slot. The first packet P(1) includes the first control message C(1), and the third frequency band Bw3 is different from the first frequency band Bw1 and the second frequency band Bw2. The above-mentioned time slot time is, for example, the time slot time of the first frequency band time slot St1(1), the second frequency band time slot St2(1), or the third frequency band time slot St3(1). In some embodiments, the slot time of the first frequency band slot St1(1), the second frequency band slot S2(1), or the third frequency band slot S3(1) is substantially equal.

Wherein, the step 404 of transmitting the second control message C(2) via the second frequency band Bw2 may include the step of generating the second packet P(2) and the time slot of another first frequency band that is not occupied in the first frequency band Bw1 The start time of St1(2), the unused second band time slot St2(1) in the second band Bw2 and the unoccupied third band time slot St3(1) in the third band Bw3 , Select to transmit the second packet P(2) via the second band slot St2(1) with a closer start time. The second packet P(2) includes the second control message C(2).

Another example of implementing the wireless access method of the communication system of FIG. 4 can be described as follows. Please refer to figure 6 again. The wireless access method shown in FIG. 4 further includes obtaining the first packet P(1) including the first control message C(1) and the second packet P(2) including the second control message C(2) Steps. The priority of the first packet P(1) is higher than that of the second packet P(2). Wherein, the step 402 of transmitting the first control message C(1) via the first frequency band Bw1 may include the start time of the first frequency slot St1(1) that is not occupied in the first frequency band Bw1 and the second frequency band Bw2 The start time of the unoccupied second frequency band slot St2(1), select The first packet P(1) is transmitted via the first time slot St1(1) with a nearer start time. The step 404 of transmitting the second control message C(2) via the second frequency band Bw2 may include the start time of the time slot St1(2) of the first frequency band Bw1 and the second frequency band The start time of the unoccupied second-band time slot St2(1) in Bw2 is selected to transmit the second packet P(2) via the second-band time slot St2(1) whose start time is closer.

The wireless access method shown in FIG. 4 further includes a receiving end sequentially monitoring the first control message C(1) and the second control message C(2) to monitor the transmission in the first frequency band Bw1 and the second frequency band Bw2 Whether the packet is the required packet step of the receiving end. If the packets transmitted on the first frequency band Bw1 and the second frequency band Bw2 are the packets required by the receiving end, the receiving end performs data decoding to receive the corresponding packets.

Please refer to FIGS. 7A and 7B, FIG. 7A shows a flowchart of a further example of a wireless access method for implementing the communication system of FIG. 4, and FIG. 7B shows a wireless storage for implementing the communication system of FIG. 4 Take a schematic diagram of a more example of the method. This method further includes the following steps. First, in step 702, multiple candidate transmission settings are provided, each of which has a frequency band and a slot boundary offset (Slot Boundary Offset). These candidate transmission settings each have multiple time slots. The frequency bands of the candidate transmission settings are different, and the slot boundary offsets of the candidate transmission settings are different, and the slot boundary offset of each candidate transmission setting is less than the slot time at this time. Next, in step 704, according to the time when a first packet is ready to be transmitted, one of the candidate transmission settings corresponding to the lowest time delay is selected as a first selected transmission setting, wherein the selected first The frequency band set by the selected transmission is the first frequency band, and the first packet includes the first control message. Then, in step 706, the transmitting end transmits the first packet to the receiving end via the first selected transmission setting.

In step 702, it is assumed that the communication system provides four candidate transmission settings, for example, candidate transmission settings 502(1) to 502(4). Candidate transmission setting 502(1) has frequency band Bw1 and slot slot offset Bos1, candidate transmission setting 502(2) has frequency band Bw2 and slot slot offset Bos2, candidate transmission setting 502(3) has frequency band Bw3 and slot slot offset Bos3 The candidate transmission setting 502(4) has the frequency band Bw4 and the slot boundary offset Bos4. Candidate transmission settings 502(1) to 502(4) each have multiple time slots, for example, candidate transmission settings 502(1) have time slots Slt1(1) to Slt1(5), and candidate transmission settings 502(2) have time slots Slt2(1)~Slt2(4), the candidate transmission setting 502(3) has a time slot Slt3(1)~Slt3(4), and the candidate transmission setting 502(4) has a time slot Slt4(1)~Slt4(4). The frequency bands Bw1, Bw2, Bw3, and Bw4 of the candidate transmission settings 502(1) to 502(4) are different, and the time slot boundary offsets of the candidate transmission settings 502(1) to 502(4) are Bos1, Bos2, Bos3, Different from the Bos4 series.

In the example shown in FIG. 7B, the time slots Slt1~Slt4 are mini-slots, and each mini-time slot has, for example, four orthogonal frequency-division multiplexing (OFDM ) Symbol element. The first symbol is used to send control messages. The last three consecutive symbols are used to transmit data signals. The boundary offsets Bos1 to Bos4 are, for example, the time lengths of 0, 1, 2, and 3 OFDM symbols, respectively. Although in the example shown in FIG. 7B, the time length of the boundary offset Bos1 is 0 OFDM symbols is used as an example for description, the slot boundary offset Bos1 may not be the time length of 0 OFDM symbols. Although in the example shown in FIG. 7B, the time length of the OFDM symbols whose boundary offsets Bos1 to Bos4 are integer multiples is taken as an example for illustration, the disclosure is not limited to this, and the boundary offsets Bos1 to Bos4 are also It can be a non-integer multiple of the time length of the OFDM symbol. Although in the example shown in FIG. 7B, a mini-time slot with 4 OFDM symbols is used as an example for explanation, this book Disclosure is not limited to this. The time slot may also be other low-latency slots (Low-Latency Slot), or the time slot may have another length of OFDM symbols, for example, a time slot with 14 OFDM symbols.

In step 704, it is assumed that the first packet is ready to be transmitted at a time point t1, for example, the second OFDM symbol corresponding to the time slot S1t1(1) of the candidate transmission setting 502(1). The communication system may select one of the candidate transmission settings 502(1) to 502(4) corresponding to the lowest time delay as the first selected transmission setting according to the time t1 when the first packet is ready to be transmitted. For example, the communication system selects the candidate transmission setting 502(1) to 502(4), where the beginning of the time slot is closest to the time point t1, for example, the candidate transmission setting 502(2) whose boundary offset Bos3 is twice the OFDM symbol 3) As the first selected transmission setting. The communication system also selects the first time slot (eg time slot Slt3(1)) of the first selected transmission setting (eg candidate transmission setting 502(3)) as the first candidate time slot.

In step 706, the transmitting end of the communication system uses the first candidate time slot (eg time slot Slt3(1)) of the first selected transmission setting (eg candidate transmission setting 502(3)) to transmit the first packet to the communication The receiving end of the system.

The multiple frequency bands set for the candidate transmission described above may be multiple partial bandwidths (BWP) of the 5G system or multiple component carriers (Component Carrier) of the LTE system. In order to more effectively support extremely low time delay, the embodiments of the present disclosure use carrier aggregation (Carrier Aggregation) or 5G standard partial bandwidth technology, and allow each partial bandwidth or component carrier to have a different time slot boundary offset. In this way, when data is to be transmitted, an appropriate partial bandwidth or component carrier can be selected to reduce the waiting time.

In the above example, a time slot is used to transmit a packet. When it is detected that there is a new packet to be transmitted, in the method of using only one candidate transmission setting for packet transmission, the packet transmission cannot be performed until at least the start of a time slot under the same candidate transmission setting. . If the method of the present disclosure is adopted, the packet to be transmitted can be scheduled to have a time slot of other candidate transmission settings with a smaller delay. In this way, the waiting time can be effectively reduced.

By reducing the waiting time, the purpose of reducing the delay time can be achieved. Taking the SCS as 60kHz for example, each OFDM symbol time is 17.84μs. Since there are 4 OFDM symbols in each mini slot, the mini slot length is equal to 71.35μs (=17.84μs*4), and the waiting time is 1 OFDM symbol time, which is 17.84μs. The time delay (=waiting time+transmission time) is 17.84μs+71.35μs=89.19μs, which is less than 100μs. In this way, the above-mentioned delay time less than 100 μs can be satisfied.

Compared with the method of using the same candidate transmission setting (for example, the candidate transmission setting 502(1)) for transmission, that is, the starting point of the time slot Slt1(2) when the communication system selects the candidate transmission setting 502(1) (Time t3) Compared with the transmission method, the waiting time set by using the same candidate transmission is longer. As shown in FIG. 7B, the waiting time from time t1 to time t3 is the time of 3 OFDM symbols, that is, 3*17.84 μs. The time delay (=waiting time+transmission time) may be 3*17.84μs+71.35μs=124.87μs, this value is greater than 100μs, and cannot meet the above-mentioned delay time less than 100μs.

In addition to being able to use most of the 5G NR standard specifications to meet the requirement of extremely low time delay (less than 100 μs), the above-mentioned embodiments of the present disclosure can effectively combat the problem of multi-path attenuation. This is because this embodiment can be implemented by using an SCS of 60 kHz (or below 60 kHz), for example, without using an SCS whose frequency is too high, so multipath interference can be avoided. Since the required SCS does not need to be too high (for example, the SCS used in the disclosed embodiment may not need to be higher than 60 kHz), the hardware devices at the transmitting end or the receiving end using the disclosed embodiment may not need to be suitable for The high-frequency environment can simplify the circuit design and reduce the complexity of the device at the transmitting end or the receiving end. Since the complexity of the device used can be reduced, and the effect of extremely low time delay can be taken into account, the advantages of taking into account the system complexity and immediacy can be achieved. Such advantages make the disclosed embodiments particularly suitable for certain applications, such as mission-critical machine-type communication applications or Internet of Things technologies.

The number of OFDM symbols in each time slot of the above candidate transmission setting is related to the radio access time. The smaller the number of OFDM symbols, the required wireless access time (that is, waiting time plus transmission Time) the shorter. The slot boundary offset of the candidate transmission setting can be adjusted according to the extended parameter set. That is, different SCSs can make the slot boundary offset of the corresponding candidate transmission setting be different accordingly.

Please refer to FIG. 8, which is a schematic diagram of the wireless receiving method of the communication system corresponding to the wireless access method of FIG. 4. The wireless receiving method of the disclosed embodiment may further include the following steps. The receiving end monitors the first control message and the second control message in sequence to monitor whether the first control message and the second control message are the control messages required by the receiving end. If yes, the receiving end decodes the data to receive the corresponding control message. The first control message is transmitted through the first frequency band, and the second control message is transmitted through the second frequency band Belt transmission. Wherein, the time difference between the transmission time points of the first control message and the second control message is less than a slot time, and the first frequency band and the second frequency band are different.

As shown in Figure 8, the receiving end monitors the candidate transmission settings 502(1)~502(4) in order to monitor whether the packets transmitted on the candidate transmission settings 502(1)~502(4) are required by the receiving end Packet. For example, the start symbols of the time slots Slt5(1), Slt6(1), and Slt7(1) of the candidate transmission settings 502(1) to 502(3) are sequentially monitored at time points t4, t5, and t6. Since the control message sent by the start symbol of each packet records the destination to be sent, the receiving end can know whether the packet is read by reading the control message of the start symbol of each packet To this end, the packet that the receiving end should receive. If it is, the receiving end receives the packet and decodes other symbols of the packet used to transmit the data signal to obtain the desired data. If the receiving end knows that the packet is not the packet that the receiving end should receive, the receiving end does not process the packet and continues to monitor these candidate transmission settings, such as continuing to monitor the candidate transmission settings in sequence 502(4), 502( 1), 502(2), and 502(3).

In a method using only one candidate transmission setting, the receiving end continuously monitors the next slot under the same candidate transmission setting before receiving the packet. For example, after the receiving end monitors the packets corresponding to the time slot slt5(1) at the time point t4, it sequentially monitors the packets corresponding to the time slots slt5(2) and slt5(3) at the time points t7 and t8. In this way, the receiving end may receive the packet after a time delay of an integer multiple of the time slot. If the method disclosed in this disclosure is adopted, the receiving end sequentially monitors the candidate transmission settings 502(1) to 502(4), for example, monitors every other symbol time, as long as it detects the packet of this receiving end Close. Compared with the method of using only one candidate transmission setting, the packet receiving method of the embodiment of the present disclosure can achieve the effect of fast reception with reduced waiting time.

In addition, the receiving end can monitor and demodulate across different candidate transmission settings (for example, it can alternately monitor different candidate transmission settings and demodulate the required data) without monitoring multiple candidate transmission settings at the same time, There is no need to simultaneously demodulate data transmitted by multiple candidate transmission settings. In this way, the embodiment of the present disclosure can be implemented without increasing the complexity of the hardware design of the receiving end.

The aforementioned transmitting end is, for example, a base station, and the aforementioned receiving end is, for example, user equipment. Or the transmitting end is user equipment, and the receiving end is a base station. That is, the wireless access method of the embodiments of the present disclosure can be applied to base stations and user equipment. When the base station transmits data, the base station serves as the transmitting end of the wireless access method of the embodiment of the present disclosure. When the base station receives data, the base station serves as the receiving end of the wireless access method of the embodiment of the present disclosure. The same is true for user equipment. When the user equipment transmits data, the user equipment serves as the transmitting end of the wireless access method of the embodiment of the present disclosure. When the user equipment receives the data, the user equipment serves as the receiving end of the wireless access method of the embodiment of the present disclosure.

Among them, the user equipment may use a grant-free transmission method or a grant-based transmission method to transmit the packet. The non-promised transmission method means that the user equipment can upload data to the base station without the base station's promise, while the promised transmission method means that the user equipment must first obtain the base station's promise before uploading the data to the base station.

Please refer to FIG. 9, which shows an example of a user equipment using the wireless access method of FIG. 4 using the non-promised transmission method or the promised transmission method to transmit a packet. intention. When the unpromised transmission method is used, assuming that the packet is ready to be transmitted at time t9, the user equipment may, for example, select the candidate transmission setting 502(3) corresponding to the lowest time delay to transmit the packet at time t10. When the promised transmission method is used, it is assumed that at time t11, the packet is ready to be transmitted, and at time t12, when a promise is received from the base station, the user equipment may select the candidate with the lowest time delay. The transmission setting 502(2) transmits the packet at time t13.

Please refer to FIG. 10, which is a schematic diagram illustrating an example of packet transmission using pre-scheduling using the wireless access method of FIG. 4. The wireless access method of the disclosed embodiment further includes the following steps. The transmitting end pre-schedules one of the candidate transmission settings as a second selected transmission setting according to the time when a user's uplink packet is transmitted and the network processing time of a packet. The transmitting end transmits a second packet in response to the user uplink packet through the second selected transmission setting.

For example, as shown in FIG. 10, the multiple candidate transmission settings of the disclosed embodiment may also include multiple downlink candidate transmission settings and multiple uplink candidate transmission settings, such as multiple uplink candidate transmission settings 502'(1 )~502'(4) and multiple downlink candidate transmission settings 502"(1)~502"(4). The receiving end selects one of the uplink candidate transmission settings corresponding to the lowest time delay according to the time when the user's uplink packet is ready to be transmitted, for example, at time t14, for example, selecting uplink candidate transmission setting 502'(3). And select the second slot Slt3'(1) of the candidate transmission setting 502'(3). The receiving end transmits the user uplink packet via the second slot Slt3'(1) of the candidate transmission setting 502'(3). The transmitting end (for example, the base station) pre-schedules one of these downlink candidate transmission settings according to the time when the user's upstream packet is transmitted (for example, time t15) and the network processing time for the packet (for example, network processing time Tnp) (E.g. candidate Transmission setting 502"(2)) as the second selected transmission setting. And select the time slot of the second selected transmission setting (eg candidate transmission setting 502"(2)) (eg time slot Slt2"(1)) The transmitting end transmits the second packet in response to the user's upstream packet via the time slot of the second selected transmission setting (eg, candidate transmission setting 502"(2)) (eg, slot Slt2"(1)). Among them, multiple uplink candidate transmission settings 502'(1)~502'(4) are located in the frequency bands Bw1_UL~Bw4_UL, and multiple downlink candidate transmission settings 502"(1)~502"(4) are located in the frequency bands Bw1_DL~Bw4_DL.

The present disclosure further provides a wireless transmission method of a communication system, including the following steps. Multiple candidate transmission settings are provided, each of which has a frequency band and a slot boundary offset, each of these candidate transmission settings has multiple time slots, the frequency bands of these candidate transmission settings are different, and these The slot boundary offsets of the candidate transmission settings are different. According to the time when a first packet is ready to be transmitted, one of the candidate transmission settings corresponding to the lowest time delay is selected as a first selected transmission setting. This first packet is transmitted via the first selected transmission setting.

The present disclosure further provides a wireless receiving method for a communication system, including the following steps. Multiple candidate transmission settings are provided, each of which has a frequency band and a slot boundary offset, each of these candidate transmission settings has multiple time slots, the frequency bands of these candidate transmission settings are different, and these The slot boundary offsets of the candidate transmission settings are different. A first packet is transmitted by the candidate transmission settings with the lowest time delay corresponding to the time when the first packet is ready to be transmitted. A receiving end sequentially monitors the candidate transmission settings to monitor whether the packets transmitted on the candidate transmission settings are the packets required by the receiving end; if so, the receiving end decodes the data to receive the first packet; If not, the receiving end continues to monitor these candidate transmission settings.

Please refer to FIG. 11, which shows an example of a block diagram of a base station applying the wireless access method of the disclosed embodiment of FIG. 4. The base station 900 includes a transmission module 902 and a transmission schedule selection module 904. The transmission module 902 is electrically connected to the transmission schedule selection module 904, and under the control of the transmission schedule selection module 904, transmits the first control message through the first frequency band and transmits the second control through the second frequency band message. The time difference between the transmission time points of the first control message and the second control message is less than a time slot time, and the first frequency band and the second frequency band are different.

The transmission module 902 is further used to perform the operations of generating packets and selecting the time slot to transmit the packets in the foregoing embodiments. The transmission schedule selection module 904 is further used to perform the operations of obtaining the first packet including the first control message and the second packet including the second control message in the foregoing multiple embodiments.

Furthermore, the transmission module 902 is used to provide a plurality of candidate transmission settings, each of which has a frequency band and a slot boundary offset, and each of these candidate transmission settings has a plurality of time slots. The frequency bands of the candidate transmission settings are different, and the slot boundary offsets of the candidate transmission settings are different, and the slot boundary offset of each candidate transmission setting is less than the slot time. The transmission schedule selection module 902 is further used to select one of the candidate transmission settings corresponding to the lowest time delay as the first selected transmission setting according to the time when the first packet is ready to be transmitted. The frequency band set by the first selected transmission is the first frequency band, and the first packet includes the first control message. The transmission module 904 is further used to transmit the first packet to a receiving end via the first selected transmission setting, such as the user equipment 906.

The user equipment 906 is used to monitor the candidate transmission settings to monitor whether the packets transmitted on the candidate transmission settings are the packets required by the user equipment. If yes, the user equipment decodes the data to receive the first packet. If not, the user equipment continues to monitor the candidate transmission settings. The base station 900 further includes a receiving module 908. The receiving module 908 is used to monitor the candidate transmission settings to monitor whether the packets transmitted on the candidate transmission settings are the packets required by the base station. If yes, the receiving module 908 decodes the data to receive the packet; if not, the receiving module 908 continues to monitor these candidate transmission settings. The transmission schedule selection module 904 pre-schedules one of these candidate transmission settings as a second selected transmission setting based on the time when a user's uplink packet is transmitted and the network processing time of a packet. The transmission module 902 further transmits the second packet in response to the user's upstream packet via the second selected transmission setting.

The wireless access method, wireless receiving method, and base station applying the communication system of the present disclosure can provide a low-latency radio frame access mechanism, so that the communication system under the 6GHz carrier frequency has a low time delay and has Strong anti-multipath attenuation capability and the user equipment does not need to process large bandwidth data. The wireless access method, wireless receiving method, and base station using the communication system disclosed in this disclosure can be applied to the communication system standard of 5G URLLC (Ultra-Reliable Low-Latency Communication).

Furthermore, the present disclosure uses carrier aggregation or partial bandwidth concepts, combined with time slot boundary offset technology, to enable communication systems below 6 GHz carrier frequency to have low time delay. In addition to the 5G NR standard specifications, the embodiments disclosed in this disclosure can be used to achieve extremely low In addition to the requirement of time delay, it can effectively combat the problem of multi-path attenuation, and it also takes into account the complexity and immediacy of mission-critical machine-type communication applications or IoT technologies.

In summary, although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make various modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be deemed as defined by the scope of the attached patent application.

402, 404: process steps

Claims (34)

A wireless access method for a communication system, the wireless access method includes: a transmitting end transmits a first control message via a first frequency band; and the transmitting end transmits a second control message via a second frequency band, wherein the The transmitting end has a first candidate transmission setting and a second candidate transmission setting, the first candidate transmission setting has the first frequency band and a first time slot boundary offset, and the second candidate transmission setting has the second frequency band and A second time slot boundary offset; wherein, the time difference between the transmission time points of the first control message and the second control message is less than a slot time, and the first frequency band and the second frequency band are different, The first slot boundary offset is different from the second slot boundary offset. The wireless access method as described in item 1 of the patent application scope, wherein the step of transmitting the first control message through the first frequency band includes: generating a first packet; and based on an unoccupied number in the first frequency band The start time of a time slot of a frequency band and the start time of a time slot of a second frequency band that is not occupied in the second frequency band, and the first packet is selected to be transmitted through the first time slot of a closer start time; wherein , The first packet contains the first control message. The wireless access method as described in item 2 of the patent application scope, wherein the step of transmitting the second control message via the second frequency band includes: generating a second packet; and According to the start time of another unoccupied first frequency band time slot in the first frequency band and the start time of the unoccupied second frequency band time slot in the second frequency band, select The second frequency slot transmits the second packet; wherein the second packet includes the second control message. The wireless access method as described in item 1 of the patent application scope, wherein the step of transmitting the first control message through the first frequency band includes: generating a first packet; and based on an unoccupied number in the first frequency band The start time of a band time slot, the start time of a second band time slot that is unoccupied in the second band, and the start time of a third band time slot that is unoccupied in a third band, select Transmitting the first packet via the first frequency band slot with a closer start time; wherein the time difference between the start time of the third frequency band slot and the first band time slot is less than one slot time, And the time difference between the start time of the third frequency band slot and the start time of the second frequency band slot is less than one slot time; wherein, the first packet includes the first control message, and the third frequency band is different from The first frequency band and the second frequency band. The wireless access method as described in item 4 of the patent application scope, wherein the step of transmitting the second control message via the second frequency band includes: generating a second packet; and according to another unused first frequency band in the first frequency band The start time of a time slot of a frequency band, the start time of the time slot of the second frequency band that is not occupied in the second frequency band, and the time of the first The start time of the unoccupied third-band time slot in the three frequency bands, the second packet is selected to be transmitted via the second-band time slot with a closer start time; wherein, the second packet includes the second control message . The wireless access method as described in item 1 of the patent application scope further includes obtaining a first packet including the first control message and a second packet including the second control message, and the priority of the first packet Higher than the priority of the second packet, wherein the step of transmitting the first control message via the first frequency band includes: according to the start time of a first frequency band slot that is not occupied in the first frequency band and the first The start time of a second frequency band slot that is not occupied in the second frequency band, and the first packet is selected to be transmitted via the first frequency band slot with a closer starting time; wherein, the second control is transmitted via the second frequency band The steps of the message include: according to the start time of another unoccupied first band time slot in the first frequency band and the start time of the unoccupied second band time slot in the second frequency band, select The time slot of the second frequency band with a nearer start time transmits the second packet. The wireless access method as described in item 1 of the patent application scope further includes: a receiving end sequentially monitoring the first control message and the second control message to monitor the transmission on the first frequency band and the second frequency band Is the packet required by the receiver, and if so, the receiver decodes the data to receive the corresponding packet. According to the wireless access method described in item 1 of the patent application scope, the first frequency band and the second frequency band are a plurality of partial widths (Bandwidth Part, BWP) or a plurality of component carriers (Component Carrier). The wireless access method as described in item 1 of the patent scope, wherein the orthogonal frequency-division multiplexing (OFDM) of the time slot corresponding to the first control message and the second control message ) The number of symbols is related to the radio access (Radio Access) time. The time slots are Mini-Slot or other Low-Latency Slot, and the first slot boundary The offset and the second time slot boundary offset can be adjusted according to an extended parameter set (Numerology). The wireless access method as described in item 1 of the patent application scope, wherein the first candidate transmission setting and the second candidate transmission setting each have a plurality of time slots, and the first time slot boundary is offset from the second time The slot boundary offset is less than the slot time; the wireless access method further includes: selecting one of the candidate transmission settings corresponding to the lowest time delay as a first according to the time when a first packet is ready to be transmitted A selected transmission setting, wherein the selected frequency band of the first selected transmission setting is the first frequency band, and the first packet includes the first control message; and the transmitting end transmits the first selected transmission setting To send the first packet to a receiving end. The wireless access method described in item 10 of the patent application scope further includes: the sending end pre-scheduling the candidates according to the time when a user's uplink packet is transmitted and the network processing time of a packet One of the transmission settings as a second selected transmission setting; and The transmitting end transmits a second packet in response to the user uplink packet via the second selected transmission setting. The wireless access method as described in item 1 of the patent application scope, wherein the transmitting end is a base station or a user equipment. A wireless receiving method for a communication system includes: a receiving end sequentially monitors a first control message and a second control message from a transmitting end to monitor the first control message and the second Whether the control message is the control message required by the receiving end, if so, the receiving end decodes the data to receive the corresponding control message, wherein the transmitting end has a first candidate transmission setting and a second candidate transmission setting, the The first candidate transmission setting has a first frequency band and a first time slot boundary offset, the second candidate transmission setting has a second frequency band and a second time slot boundary offset; wherein, the first control message is passed The first frequency band is transmitted, and the second control message is transmitted through the second frequency band; wherein, the time difference between the transmission time points of the first control message and the second control message is less than a time slot, and the first frequency band and the The second frequency band is different, and the first slot boundary offset is different from the second slot boundary offset. The wireless receiving method as described in item 13 of the patent application range, wherein a first packet is based on the start time of a first frequency band slot that is not occupied in the first frequency band and the unoccupied frequency in the second frequency band The beginning of a time slot of a second frequency band In the meantime, the first packet to be transmitted through the time slot of the first frequency band with a nearer start time is selected; wherein, the first packet includes the first control message. The wireless receiving method as described in item 14 of the patent application scope, wherein a second packet is based on the start time of another unoccupied first frequency band slot in the first frequency band and the unoccupied second frequency band The start time of the second frequency band time slot of the second band is selected to be transmitted through the second frequency band time slot with a closer start time; wherein, the second packet includes the second control message. The wireless receiving method as described in item 13 of the patent application scope, wherein a first packet is based on the start time of a first frequency band slot that is not occupied in the first frequency band, and the unused frequency band in the second frequency band The start time of a second frequency band slot and the start time of a third frequency band slot that is not occupied in a third frequency band are selected to be transmitted through the first frequency band slot whose start time is closer; wherein, The time difference between the start time of the third frequency band time slot and the start time of the first frequency band time slot is less than one time slot time, and the start time of the third frequency band time slot and the start time of the second frequency band time slot The time difference of time is less than one slot time; wherein, the first packet includes the first control message, and the third frequency band is different from the first frequency band and the second frequency band. The wireless receiving method as described in item 16 of the patent application scope, wherein a second packet is based on the start time of another unoccupied first frequency band slot in the first frequency band and the unoccupied second frequency band The start of the time slot of the second frequency band Time and the start time of the third frequency band slot that is not occupied in the third frequency band, which is selected to be transmitted via the second frequency band slot whose start time is closer; wherein, the second packet includes the second control message. The wireless receiving method as described in item 13 of the patent application scope, wherein a first packet including the first control message and a second packet including the second control message are obtained, and the priority of the first packet Higher than the priority of the second packet, the first packet is based on the start time of an unoccupied first frequency band slot in the first frequency band and the unoccupied second frequency band time in the second frequency band The start time of the slot is selected to be transmitted via the time slot of the first frequency band with a closer start time; wherein, the second packet is based on the start of another first frequency band time slot that is not occupied in the first frequency band The time and the start time of the time slot of the second frequency band that is not occupied in the second frequency band are selected to be transmitted via the time slot of the second frequency band whose start time is closer. As in the wireless receiving method described in item 13 of the patent application scope, the first frequency band and the second frequency band are a plurality of partial bandwidths or a plurality of component carriers. The wireless receiving method as described in item 13 of the patent application range, wherein the number of orthogonal frequency division multiplexing symbols in the time slot corresponding to the first control message and the second control message is the wireless access time Relatedly, the time slots are mini time slots or other low delay time slots, and the first time slot boundary offset and the second time slot boundary offset can be adjusted according to an extended parameter set. The wireless receiving method as described in item 13 of the patent application scope, wherein the first candidate transmission setting and the second candidate transmission setting each have a plurality of times Slot, and the first slot boundary offset and the second slot boundary offset are less than the slot time; the wireless receiving method further includes: receiving a first packet, the first packet is based on the first The time when the packet is ready to be transmitted, a first selected transmission setting of one of the candidate transmission settings whose time delay is selected to be the lowest is transmitted, wherein the frequency band of the selected first selected transmission setting is the The first frequency band, and the first packet includes the first control message. The wireless receiving method described in item 21 of the patent application scope further includes: a transmitting end pre-scheduling one of the candidate transmission settings as a based on the time when a user's uplink packet is transmitted and the network processing time of a packet A second selected transmission setting; and the transmitting end transmits a second packet in response to the user uplink packet via the second selected transmission setting. The wireless receiving method as described in item 13 of the patent application scope, wherein the transmitting end is a base station or a user equipment. A base station includes: a first candidate transmission setting with a first frequency band and a first time slot boundary offset; a second candidate transmission setting with a second candidate transmission setting Frequency band and a second time slot boundary offset; a transmission schedule selection module; and A transmission module is electrically connected to the transmission schedule selection module, and under the control of the transmission schedule selection module, transmits a first control message through the first frequency band and through the second frequency band Transmitting a second control message; wherein the time difference between the transmission time points of the first control message and the second control message is less than a time slot time, and the first frequency band and the second frequency band are different, the first time slot The boundary offset is different from the second time slot boundary offset. The base station as described in item 24 of the patent application scope, wherein the transmission module is further used to generate a first packet, and according to the start time of a first frequency band slot that is not occupied in the first frequency band and the first The start time of an unoccupied second-band time slot in the second frequency band, the first packet is selected to be transmitted via the first-band time slot with a closer start time; wherein, the first packet includes the first control message . The base station as described in item 25 of the patent application scope, wherein the transmission module is further used to generate a second packet, and is based on the start time of the time slot of another first frequency band that is not occupied in the first frequency band and the The start time of the unoccupied second-band time slot in the second frequency band, the second packet is selected to be transmitted via the second-band time slot with a closer start time; wherein, the second packet includes the second control message. The base station as described in item 24 of the patent application scope, wherein the transmission module is further used to generate a first packet, and according to the start time of a first frequency band slot that is not occupied in the first frequency band, the first The start time of an unoccupied second band time slot in the second frequency band and the start of an unoccupied third band time slot in the third frequency band Start time, select to transmit the first packet via the first frequency band slot with a closer starting time; wherein the time difference between the start time of the third frequency band slot and the start time of the first frequency band slot is less than one Time slot time, and the time difference between the start time of the third frequency band time slot and the start time of the second frequency band time slot is less than one time slot time; wherein, the first packet includes the first control message, and the first The three frequency bands are different from the first frequency band and the second frequency band. The base station as described in item 27 of the patent application scope, wherein the transmission module is further used to generate a second packet, and according to the start time of another unoccupied first frequency band slot in the first frequency band, the The start time of the unoccupied second frequency band slot in the second frequency band and the start time of the unoccupied third frequency band time slot in the third frequency band are selected via the second The frequency slot transmits the second packet; wherein, the second packet includes the second control message. According to the base station described in item 24 of the patent application scope, the transmission schedule selection module is further used to obtain a first packet including the first control message and a second packet including the second control message, the first The priority of the packet is higher than the priority of the second packet, wherein the transmission module is further used to determine the start time of a first frequency band slot that is not occupied in the first frequency band and the unused time in the second frequency band The start time of the occupied second frequency band slot is selected to transmit the first packet through the first frequency band slot with a closer start time; Wherein, the transmission module is further used to determine the start time of another unoccupied first frequency band slot in the first frequency band and the start time of the unoccupied second frequency band slot in the second frequency band , Select to transmit the second packet via the time slot of the second frequency band with a nearer start time. As the base station described in item 24 of the patent application scope, the first frequency band and the second frequency band are a plurality of partial bandwidths or a plurality of component carriers. The base station according to item 24 of the patent application scope, wherein the number of orthogonal frequency division multiplexing symbols in the time slot corresponding to the first control message and the second control message is related to the wireless access time, The time slots are mini time slots or other low delay time slots, and the first time slot boundary offset and the second time slot boundary offset can be adjusted according to an extended parameter set. The base station as described in item 24 of the patent application scope, wherein the first candidate transmission setting and the second candidate transmission setting each have a plurality of time slots, and the first one time slot boundary offset and the second time slot boundary The offset is less than the time slot time; wherein, the transmission schedule selection module is further used to select one of the candidate transmission settings corresponding to the lowest time delay as the time when the first packet is ready to be transmitted as A first selected transmission setting, the selected frequency band of the first selected transmission setting is the first frequency band, and the first packet includes the first control message, and the transmission module is further used to pass the first transmission Select the transmission setting to send the first packet to a receiving end. The base station as described in item 32 of the patent application scope, wherein the transmission schedule selection module is further used for sending a packet according to a time when a user uplink packet is transmitted The network processing time of the packet, one of the candidate transmission settings is pre-scheduled as a second selected transmission setting A second packet. The base station as described in item 24 of the patent application scope, wherein the base station serves as a transmitting end.

Images