TW202025682A - 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 reception method, and base station using the communication system

The present invention relates to a wireless access method, a wireless receiving method, and a base station using the communication system.

In response to the current Internet of Things (IoT) and smart city applications, in recent years, mobile communications have been applied to communication between people and things as well. As everyone knows, there are three main directions for 5G technical standards, 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 unmanned vehicles, industrial automation (Industrial process automation), remote surgery (Remote surgery), perception network (Tactile internet), etc. with low latency (Low Latency) And applications requiring high reliability (High Reliability).

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

Therefore, how to achieve the low time delay requirement for the 5G standard technology while taking into account the system complexity is not too high is one of the directions the industry is committed to.

According to the first aspect of the present invention, a wireless access method for a communication system is provided. The wireless access method includes the following steps. A transmitting end transmits a first control message through a first frequency band. The transmitting end transmits a second control message through 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 time 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 provided, which includes 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 control messages required by the receiving end. If so, the receiving end performs data decoding to receive the corresponding The control message. 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 time slot time, and the first frequency band and the second frequency band are different.

According to the third aspect of the present invention, a base station is provided. The base station includes a transmission schedule selection module and a transmission module. The transmission module is electrically connected to the transmission scheduling selection module, and under the control of the transmission scheduling selection module, transmits a first control message through a first frequency band and transmits a second control message 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 time slot time, and the first frequency band and the second frequency band are different.

In order to have a better understanding of the above-mentioned and other aspects of the present invention, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows:

The Low Latency system is one of the key points of the future 5G system development. 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, in Mission-critical Machine Type Communications (MTC) applications, the wireless access time required is less than 100 μs. The mission-critical machine-type communication applications are, for example, telemedicine surgery, sensory networks, and industrial automation.

Please refer to Figure 1, which is a schematic diagram of an example of mission-critical machine communication applications. 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, it generates a signal S1 and transmits the corresponding wireless signal S2 to the network 106 through the transmitter 104. After the network 106 finishes processing the related procedures, the network 106 returns a 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 corresponding processing The time when the wireless signal S3 is transmitted from the network 106 to the receiver 108 is T4, and the time when the receiver 108 receives the signal S3 and outputs 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, T2 and T4 need to be less than 100μs respectively (assuming T3 is about 500μs and T1+T5 is about 300μs). How to make T2 and T4 each need to be less than 100μs, so that the device that receives the wireless signal (for example, the actuator 110) has more time to process, for example, to process the information sent by the sensor 102, that is One of the goals to be achieved in this embodiment.

In the slot-based transmission mode, frame transmission time and waiting time are two key factors that affect the time delay at the baseband end. Please refer to Figure 2, which shows a schematic diagram of the time delay during frame transmission. It is assumed 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 available for transmission at the time t1 that is not the starting point of the time slot 202(1), the data must wait the time length Twt before it can be sent to the starting point of the next time slot 202(2) Transmission, the time required for transmission is time Ttr. In this way, the time delay Tdp is equal to the sum of the waiting time Twt and the transmission time Ttr.

Please refer to Figure 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 SCS is equal to 240kHz, each OFDM symbol time is 4.46μs. Since there are 14 OFDM symbols in each slot, the 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 slot still cannot meet the requirement of delay time less than 100μs when using 14 OFDM symbols.

If SCS is equal to 60kHz and the mini time slot is used, the time of each OFDM symbol is 17.84μs. Since each mini time slot has 4 OFDM symbols, the length of the mini time slot is equal to 71.35 μs (=17.84 μs*4), and the maximum waiting time Twt is the length of a mini time slot, which is 71.35 μs. However, the maximum time delay Tdp (=maximum waiting time Twt+transmission time Ttr) is still 71.35μs +71.35μs =142.7μs. Therefore, when SCS is equal to 60kHz, the mini-time slot using 4 OFDM symbols still cannot meet the requirement of delay time 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, the waiting time Twt can be shortened and the frame transmission time Ttr can be reduced. However, this approach has the following disadvantages: (1) The occupied bandwidth becomes larger, especially below sub-6GHz (for example, SCS is less than 60kHz), and it is difficult to find resources with large bandwidth for some frequency bands. (2) At this stage, it is difficult to implement millimeter-wave radio frequency technology, and circuit design is difficult, which makes the cost of the transceiver higher; (3) The large extended parameter set is easily affected by the multi-path attenuation of wireless communication and reduces The quality of wireless communication. Therefore, how to avoid the above-mentioned shortcomings and meet the requirement that the delay time is less than 100 μs is one of the problems to be solved by this disclosure.

In order to solve the above-mentioned problems, this disclosure proposes a wireless access method for a communication system. Please refer to FIG. 4, which shows a flowchart of a wireless access method for a communication system according to an embodiment of the disclosure. A wireless access method of a communication system in an embodiment of the present disclosure is applicable to a base station. The wireless access method includes the following steps. In step 402, a first control message is transmitted through a first frequency band. In step 404, a second control message is transmitted through a second frequency band. Wherein, the time difference between the transmission time point 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, the first control message and the second control message to be transmitted are 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 method that the time difference between points is less than the time slot time can make the delay between two adjacent control messages less than one time slot time. In this way, the waiting time can be effectively reduced.

Please refer to FIG. 5, which shows a schematic diagram of an example of the wireless access method of the communication system in 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 transmits the second control message C(2) via the second frequency band Bw2. 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 the one-time slot time, such as the time slot time St1(1) of the first frequency band Bw1 or the second frequency band The time 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) via the first frequency band Bw1 may further include the step of generating a first packet P(1), and according to 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 frequency band time slot St2(1) that is not occupied in the second frequency band Bw2, and the first frequency slot time slot St1( 1) The step of transmitting the first packet P(1). Among them, the first packet P(1) contains 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 according to another unoccupied packet in the first frequency band Bw(1) The start time of the first frequency band time slot St1(2) and the start time of the unoccupied second frequency band time slot St2(1) in the second frequency band Bw2, select the second frequency band time slot with a closer start time St2(1) transmits the second packet P(2). Among them, the second packet P(2) contains the second control message C(2).

Please refer to FIG. 6, which shows a schematic diagram of another example of implementing the wireless access method of the communication system of FIG. 4. The step 402 of transmitting the first control message C(1) through the first frequency band Bw1 in Fig. 4 may further include the step of generating the first packet P(1), and according to the first frequency band that is not occupied in the first frequency band Bw1 The start time of slot St1(1), the start time of the unoccupied second frequency band time slot St2(1) in the second frequency band Bw2 and the unoccupied third frequency band time slot St3(1) of the third frequency band Bw3 ), select the step of transmitting the first packet via the first frequency slot St1(1) with the nearer starting time. Wherein, the time difference TD(3) between the start time of the third frequency band time slot St3(1) and the start time of the first frequency band time slot St1(1) is less than one time slot time, and the third frequency band time slot St3(1) The time difference TD(2) between the start time of the second frequency band time slot St2(1) and the start time of the second frequency band time slot St2(1) is less than one time slot time. 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 aforementioned 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 time slots 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) are substantially equal.

Wherein, the step 404 of transmitting the second control message C(2) via the second frequency band Bw2 may include a step of generating a second packet P(2), and according to 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 start time of the unoccupied second frequency band time slot St2(1) in the second frequency band Bw2, and the unoccupied third frequency band time slot St3(1) of the third frequency band Bw3 Select to transmit the second packet P(2) via the second frequency slot St2(1) with a closer start time. Among them, the second packet P(2) contains the second control message C(2).

Another example of implementing the wireless access method of the communication system in Figure 4 can be described as follows. Please refer to Figure 6 again. The wireless access method shown in Figure 4 further includes obtaining a first packet P(1) containing a first control message C(1) and a second packet P(2) containing a second control message C(2)的步。 The steps. The priority of the first packet P(1) is higher than the priority 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 step 402 according to the unoccupied first frequency band time slot St1(1) in the first frequency band Bw1 and the second frequency band Bw2 For the start time of the unoccupied second frequency band slot St2(1), the first packet P(1) is selected to be transmitted via the first frequency band slot St1(1) with a closer start time. And the step 404 of transmitting the second control message C(2) via the second frequency band Bw2 may include according to the start time of another first frequency band time slot St1(2) that is not occupied in the first frequency band Bw1 and the second frequency band For the start time of the second frequency band slot St2(1) that is not occupied in Bw2, the second packet P(2) is selected to be transmitted via the second frequency band slot St2(1) with a closer start time.

The wireless access method shown in Figure 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 on the first frequency band Bw1 and the second frequency band Bw2 Whether the packet is the step of the packet required by the receiving end. If the packets transmitted on the first frequency band Bw1 and the second frequency band Bw2 are packets needed 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 another example of the wireless access method of the communication system of FIG. 4, and FIG. 7B shows the wireless storage of the communication system of FIG. 4 Take a schematic diagram of another example of the method. This method further includes the following steps. First, in step 702, a plurality of candidate transmission settings are provided, each of which has a frequency band and a slot boundary offset (Slot Boundary Offset). Each of these candidate transmission settings has multiple time slots. The frequency bands of the candidate transmission settings are different, and the time slot boundary offsets of the candidate transmission settings are different, and the time slot boundary offset of each candidate transmission setting is less than the time slot 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 first selected The frequency band set for the selected transmission is the first frequency band, and the first packet contains the first control message. After that, 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 4 candidate transmission settings, for example, candidate transmission settings 502(1) to 502(4). The candidate transmission setting 502 (1) has the frequency band Bw1 and the slot boundary offset Bos1, the candidate transmission setting 502 (2) has the frequency band Bw2 and the slot boundary offset Bos2, and the candidate transmission setting 502 (3) has the frequency band Bw3 and the slot boundary offset Bos3 , The candidate transmission setting 502(4) has a frequency band Bw4 and a slot boundary offset Bos4. The candidate transmission settings 502(1)~502(4) each have multiple time slots. For example, the candidate transmission setting 502(1) has time slots Slt1(1)~Slt1(5), and the candidate transmission setting 502(2) has time slots. Slt2(1)~Slt2(4), the candidate transmission setting 502(3) has time slots Slt3(1)~Slt3(4), and the candidate transmission setting 502(4) has time slots Slt4(1)~Slt4(4). The frequency bands Bw1, Bw2, Bw3, and Bw4 of the candidate transmission settings 502(1)~502(4) are different, and the time slot boundaries of the candidate transmission settings 502(1)~502(4) are offset from Bos1, Bos2, Bos3, It is different from the Bos4 series.

In the example shown in Figure 7B, the time slots Slt1~Slt4 are Mini-Slots, and each mini-slot system has, for example, 4 Orthogonal frequency-division multiplexing (OFDM). ) Symbols. 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 length 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 being 0 OFDM symbols is taken as an example, the time 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 symbol whose boundary offsets Bos1~Bos4 are respectively integer multiples is taken as an example, the disclosure is not limited to this, and the boundary offsets Bos1~Bos4 are also It may 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 taken as an example for description, the present disclosure is not limited to this. The time slot can also be other low-latency slots, or the time slot can have the length of another number 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 time t1, which is, for example, the second OFDM symbol corresponding to the time slot Slt1(1) of the candidate transmission setting 502(1). The communication system can 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 settings 502(1)~502(4), the beginning of the time slot is closest to the time point t1, for example, the candidate transmission setting 502() whose boundary offset Bos3 is twice the OFDM symbol 3) As the first selected transmission setting. The communication system selects the first time slot (for example, time slot Slt3(1)) of the first selected transmission setting (for example, the 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 (for example, time slot Slt3(1)) of the first selected transmission setting (for example, the candidate transmission setting 502(3)) to transmit the first packet to the communication The receiving end of the system.

The multiple frequency bands of the aforementioned candidate transmission settings may be multiple Bandwidth Part (BWP) of the 5G system or multiple component carriers (Component Carrier) of the LTE system. In order to more effectively support the extremely low time delay, the embodiment of the present disclosure adopts carrier aggregation (Carrier Aggregation) or 5G standard partial bandwidth technology, and allows 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 part of the bandwidth or carrier can be selected to reduce the waiting time.

In the above example, a time slot is used to transmit a packet. When a new packet is detected to be transmitted, in the way that only one candidate transmission setting is used for packet transmission, the packet can be transmitted at least until the beginning of the next time slot under the same candidate transmission setting . If the method disclosed in the present disclosure is adopted, the packet to be transmitted may have a chance to be scheduled in the 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 of 60kHz as an example, the time of each OFDM symbol is 17.84μs. Since each mini slot has 4 OFDM symbols in total, the length of the mini slot is equal to 71.35 μs (=17.84 μs*4), and the waiting time is the time of 1 OFDM symbol, which is 17.84 μs. The time delay (= waiting time + transmission time) is 17.84 μs + 71.35 μs = 89.19 μs, and this value is less than 100 μs. In this way, the above-mentioned delay time requirement of less than 100 μs can be met.

Compared with the transmission using the same candidate transmission setting (for example, the candidate transmission setting 502(1)), that is, the starting point of the time slot Slt1(2) when the communication system selects the candidate transmission setting 502(1)) (Time point t3) Compared with the method of transmission, the waiting time of using the same candidate transmission setting is longer. As shown in Figure 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 requirement.

The above-mentioned embodiments of the present disclosure can extend most of the 5G NR standard specifications to meet the requirement of extremely low time delay (less than 100 μs), and can effectively combat the problem of multipath attenuation. This is because this embodiment can be implemented with an SCS of 60 kHz (or below 60 kHz), for example, without using an SCS with a too high frequency, so multipath interference can be avoided. Since the required SCS does not need to be too high (for example, the SCS used in the embodiment of the present disclosure may not be higher than 60kHz), so, the hardware equipment of the transmitting end or the receiving end using the embodiment of the present disclosure may not be suitable for very high 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 both system complexity and real-time can be achieved. Such advantages make the embodiments of the present disclosure particularly suitable for certain applications, such as mission-critical machine communication applications or Internet of Things technology.

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

Please refer to Figure 8, which shows a schematic diagram of the wireless receiving method of the communication system corresponding to the wireless access method of Figure 4. The wireless receiving method of the embodiment of the disclosure may further include the following steps. The receiving end sequentially monitors the first control message and the second control message to monitor whether the first control message and the second control message are control messages required by the receiving end. If yes, the receiving end performs data decoding to receive the corresponding control message. 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. Wherein, the time difference between the transmission time points of the first control message and the second control message is less than one time slot time, and the first frequency band and the second frequency band are different.

As shown in Figure 8, the receiver sequentially monitors the candidate transmission settings 502(1)~502(4) to monitor whether the packets transmitted on the candidate transmission settings 502(1)~502(4) are needed by the receiver Packets. 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, respectively. Since the control message sent by the start symbol of each packet records the destination to be sent, the receiving end can read the control message of the start symbol of each packet to know whether the packet is This is the packet that the receiver should receive. If it is, the receiving end receives the packet and decodes other symbols used to transmit the data signal in the packet 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, for example, continue to monitor the candidate transmission settings 502(4), 502( 1), 502(2), and 502(3).

In the method of using only one candidate transmission setting, the receiving end continuously monitors the next time slot of the same candidate transmission setting before receiving packets. For example, after the receiving end monitors the packets corresponding to the slot slt5(1) at the time point t4, it sequentially monitors the packets corresponding to the slots slt5(2) and slt5(3) at the time points t7 and t8. In this way, the receiving end may require a time delay that is an integral multiple of the time slot before receiving the packet. If the method disclosed in this disclosure is adopted, the receiving end will monitor the candidate transmission settings 502(1)~502(4) in turn, for example, every other symbol time, as long as it is detected that the receiving end of the packet can be received . 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 receiving with reduced waiting time.

In addition, the receiving end can monitor and demodulate across different candidate transmission settings (for example, it can monitor different candidate transmission settings in turn 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 embodiments of the 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, a user equipment. Or the transmitting end is the user equipment, and the receiving end is the base station. That is, the wireless access method of the embodiment of the present disclosure can be applied to the base station, and can also be applied to the 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 disclosure. When the base station receives data, the base station serves as the receiving end of the wireless access method in the embodiment of the disclosure. The same goes for user equipment. When the user equipment transmits data, the user equipment serves as the transmitting end of the wireless access method in the embodiment of the disclosure. When the user equipment receives data, the user equipment serves as the receiving end of the wireless access method in the embodiment of the disclosure.

Among them, the user equipment can use a grant-free transmission method or a grant-based transmission method to transmit the packet. The non-promising transmission method means that the user equipment can upload data to the base station without the permission of the base station, while the promised transmission method means that the user equipment must obtain the consent of the base station before uploading data to the base station.

Please refer to Figure 9, which is a schematic diagram of an example of a user equipment using the wireless access method shown in Figure 4 to transmit packets using the non-promise transmission method or the promise transmission method. When using the non-commitment transmission method, assuming that the packet is ready to be transmitted at time t9, the user equipment may select the candidate transmission setting 502(3) corresponding to the lowest time delay to transmit the packet at time t10, for example. When using the promised transmission method, suppose that at time t11, the packet is ready to be transmitted, and at time t12, when a promise from the base station is received, the user equipment may, for example, select the candidate with the lowest corresponding time delay The transmission setting 502(2) transmits this packet at time t13.

Please refer to FIG. 10, which shows a schematic diagram of an example of packet transmission using the wireless access method shown in FIG. 4 through pre-scheduling. The wireless access method of the embodiment of the disclosure further includes the following steps. The transmitting end pre-schedules one of these candidate transmission settings as a second selected transmission setting based on the time when a user 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 via the second selected transmission setting.

For example, as shown in FIG. 10, the multiple candidate transmission settings of the embodiment of the present disclosure may also include multiple downlink candidate transmission settings and multiple uplink candidate transmission settings, for example, 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 uplink packet is ready to be transmitted, for example, time t14, for example, selects the uplink candidate transmission setting 502'(3). And select the second time slot Slt3'(1) of the candidate transmission setting 502'(3). The receiving end transmits the user uplink packet via the second time slot Slt3'(1) of the candidate transmission setting 502'(3). The sender (for example, the base station) pre-schedules one of these downlink candidate transmission settings according to the time when the user uplink packet is sent (for example, time t15) and the network processing time of the packet (for example, the network processing time Tnp) (For example, the candidate transmission setting 502"(2)) as the second selected transmission setting. And select the second selected transmission setting (for example, the candidate transmission setting 502"(2)) time slot (for example, the time slot Slt2" (1)). The sender sends a response to this user's uplink packet via the time slot (e.g., time slot Slt2"(1)) of the second selected transmission setting (for example, the candidate transmission setting 502"(2)) The second packet. The multiple uplink candidate transmission settings 502'(1)~502'(4) are located in the frequency band Bw1_UL~Bw4_UL, and the multiple downlink candidate transmission settings 502”(1)~502”(4) are located in the frequency band Bw1_DL ~Bw4_DL.

The present disclosure further provides a wireless transmission method of a communication system, including the following steps. Provide multiple candidate transmission settings, each of these candidate transmission settings has a frequency band and a time 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 These time slot boundary offsets for 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 this first selected transmission setting.

The present disclosure further provides a wireless receiving method of a communication system, including the following steps. Provide multiple candidate transmission settings, each of these candidate transmission settings has a frequency band and a time 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 These time slot boundary offsets for candidate transmission settings are different. A first packet is transmitted by the selected candidate transmission settings whose corresponding time delay is the lowest according to the time when the first packet is ready to be transmitted. A receiving end sequentially monitors these candidate transmission settings to monitor whether the packets transmitted on these candidate transmission settings are the packets required by the receiving end, and if so, the receiving end performs data decoding 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 embodiment of the present disclosure in 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 a first control message via a first frequency band and a second control message via a second frequency band message. Wherein, the time difference between the transmission time points of the first control message and the second control message is less than one 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 actions of generating packets in the above-mentioned multiple embodiments and the actions of selecting time slots to transmit the packets. 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 above-mentioned multiple embodiments.

Furthermore, the transmission module 902 is used to provide a plurality of candidate transmission settings, each of these candidate transmission settings has a frequency band and a time slot boundary offset, and each of these candidate transmission settings has multiple time slots. The frequency bands of the candidate transmission settings are different, and the time slot boundary offsets of the candidate transmission settings are different, and the time slot boundary offset of each candidate transmission setting is less than the time 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 of the first selected transmission setting 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, such as the user equipment 906, via the first selected transmission setting.

The user equipment 906 is used to monitor these candidate transmission settings to monitor whether the packets transmitted on the candidate transmission settings are 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 these candidate transmission settings to monitor whether the packets transmitted on the candidate transmission settings are packets required by the base station. If it is, the receiving module 908 performs data decoding to receive the packet; if not, the receiving module 908 continues to monitor these candidate transmission settings. The transmission scheduling selection module 904 pre-schedules one of these candidate transmission settings as a second selected transmission setting based on the time when a user 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 uplink packet through the second selected transmission setting.

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

Furthermore, this disclosure uses the concept of carrier aggregation or partial bandwidth, combined with the time slot boundary offset technology, so that the communication system below the 6GHz carrier frequency also has the characteristics of low time delay. The embodiments of the present disclosure can extend most of the 5G NR standard specifications to meet the requirements of extremely low time delay, and can effectively combat the problem of multipath attenuation, and also take into account the complexity of mission-critical machine-type communication applications or IoT technologies. Degree and immediacy.

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

100: System for communication applications 102: Sensor 104: Transmitter 106: Network 108: Receiver 110: Actuator S1~S4: Signal T1~T5: Time 202(1), 202(2): Time slot 204: Orthogonal Frequency Division Multiplexing (OFDM) symbols 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: Band C(1): First Control message C(2): second control message TD(1), TD(2), TD(3): time difference P(1): first packet P(2): second packet St1(1), St1( 2): First frequency band time slot St2(1): Second frequency band time slot St3(1): Third frequency band time slot 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 shows a schematic diagram of the time delay during frame transmission. Figure 3 shows the slot length, mini slot length and OFDM symbol time corresponding to different extended parameter sets. FIG. 4 is a flowchart of a wireless access method of a communication system according to an embodiment of the disclosure. FIG. 5 is a schematic diagram showing an example of the wireless access method of the communication system of FIG. 4. FIG. 6 is a schematic diagram showing another example of implementing the wireless access method of the communication system of FIG. 4. FIG. 7A is a flowchart of another example of implementing the wireless access method of the communication system of FIG. 4. FIG. FIG. 7B is a schematic diagram of another example of implementing the wireless access method of the communication system of FIG. 4. FIG. FIG. 8 is a schematic diagram of an example of the signal received by the receiver using the wireless access method of FIG. 4. Fig. 9 is a schematic diagram showing an example of a user equipment using the wireless access method shown in Fig. 4 to transmit packets using the non-promising transmission method or the permitted transmission method. FIG. 10 is a schematic diagram showing an example of the wireless access method in FIG. 4 that can be pre-scheduled to transmit packets. FIG. 11 shows an example of a block diagram of a base station applying the wireless access method of the embodiment of the present disclosure in FIG. 4.

402, 404: Process steps

Claims (34)

A wireless access method for a communication system, the wireless access method comprising: a transmitting end transmits a first control message through a first frequency band; and the transmitting end transmits a second control message through a second frequency band; wherein, the 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. For the wireless access method described in claim 1, wherein the step of transmitting the first control message via the first frequency band includes: generating a first packet; and according to a first unoccupied first frequency band in the first frequency band The start time of a frequency band time slot and the start time of a second frequency band time slot that is not occupied in the second frequency band are selected to transmit the first packet through the first frequency band time slot with a closer start time; where , The first packet contains the first control message. For the wireless access method described in claim 2, wherein the step of transmitting the second control message through the second frequency band includes: generating a second packet; and according to another unoccupied first frequency band The start time of the first frequency band time slot and the start time of the second frequency band time slot that is not occupied in the second frequency band, selecting to transmit the second packet through the second frequency band time slot with a closer start time; Wherein, the second packet includes the second control message. For the wireless access method described in claim 1, wherein the step of transmitting the first control message via the first frequency band includes: generating a first packet; and according to a first unoccupied first frequency band in the first frequency band The start time of a frequency band time slot, the start time of a second frequency band time slot that is not occupied in the second frequency band, and the start time of a third frequency band time slot that is not occupied in a third frequency band, select Transmitting the first packet via the first frequency band time slot with a relatively near start time; 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 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 contains the first control message, and the third frequency band is different from The first frequency band and the second frequency band. For the wireless access method described in claim 4, wherein the step of transmitting the second control message via the second frequency band includes: generating a second packet; and according to another unoccupied first frequency band in the first frequency band The start time of a frequency band time slot, the start time of the second frequency band time slot that is not occupied in the second frequency band, and the start time of the third frequency band time slot that is not occupied in the third frequency band, select The second packet is transmitted through the second frequency band time slot with a relatively short start time; wherein, the second packet includes the second control message. The wireless access method described in claim 1 further includes obtaining a first packet containing the first control message and a second packet containing 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 time slot that is not occupied in the first frequency band and the first frequency band The time slot of a second frequency band that is not occupied in the two frequency bands is selected to transmit the first packet through the first frequency band time slot with a closer starting time; wherein, the second control is transmitted through the second frequency band The message step includes: selecting a via start time according to the start time of another first frequency band time slot that is not occupied in the first frequency band and the start time of the second frequency band time slot that is not occupied in the second frequency band The second frequency band time slot with a shorter start time transmits the second packet. The wireless access method described in claim 1 further includes: a receiving end sequentially monitors the first control message and the second control message to monitor the transmission on the first frequency band and the second frequency band Whether the packet of is the packet required by the receiving end, if so, the receiving end performs data decoding to receive the corresponding packet. For the wireless access method described in the first item of the scope of patent application, the first frequency band and the second frequency band are a plurality of Bandwidth Part (BWP) or a plurality of component carriers (Component Carrier). According to the wireless access method described in claim 1, wherein the time slot corresponding to the first control message and the second control message has Orthogonal Frequency-Division Multiplexing (OFDM) ) The number of symbols is related to the radio access time. These time slots are Mini-Slots or other Low-Latency Slots, and the first control message is related to The time difference of the transmission time point of the second control message can be adjusted according to an extended parameter set (Numerology). For example, the wireless access method described in item 1 of the patent application further includes: providing a plurality of candidate transmission settings, each of the candidate transmission settings has a frequency band and a time slot boundary offset, and each of the candidate transmission settings has a plurality of Time slot, the frequency bands of the candidate transmission settings are different, and the time slot boundary offsets of the candidate transmission settings are different, and the time slot boundary offset of each candidate transmission setting is less than the time slot time; 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 selected transmission setting is The frequency band is the first frequency band, and the first packet includes the first control message; and the transmitting end transmits the first packet to a receiving end through the first selected transmission setting. For example, the wireless access method described in claim 10 further includes: the transmitting end pre-scheduling the candidates according to the time when a user uplink packet is transmitted and the network processing time of a packet One of the transmission settings is used as a second selected transmission setting; and the transmitting end transmits a second packet in response to the user uplink packet through the second selected transmission setting. As for the wireless access method described in claim 1, wherein the transmitting end is a base station or a user equipment. A wireless receiving method of a communication system, comprising: 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 controls required by the receiving end If yes, the receiving end performs data decoding to receive the corresponding control message; wherein, the first control message is transmitted through the first frequency band, and the second control message is transmitted through the second frequency band; wherein, the first control message is transmitted through the second frequency band; The time difference between the transmission time points of a 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. According to the wireless receiving method described in claim 13, wherein a first packet is based on the time slot of a first frequency band that is not occupied in the first frequency band and the time slot of a first frequency band that is not occupied in the second frequency band. The first packet is transmitted via the first frequency slot with a shorter starting time as the start time of a second frequency band time slot; wherein, the first packet includes the first control message. For the wireless receiving method described in item 14 of the scope of patent application, a second packet is based on the time slot start time of another first frequency band that is not occupied in the first frequency band and the time slot of the second frequency band that is not occupied The start time of the second frequency band time slot is selected to be transmitted via the second frequency band time slot with a closer start time; wherein, the second packet includes the second control message. For the wireless receiving method described in item 13 of the scope of patent application, a first packet is based on the time slot of a first frequency band that is not occupied in the first frequency band, and the time slot of the second frequency band that is not occupied. The start time of a second frequency band time slot and the start time of a third frequency band time slot that is not occupied in a third frequency band are selected to be transmitted through the first frequency band time slot with a closer start time; 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 is less than a time 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. For the wireless receiving method described in item 16 of the scope of the patent application, a second packet is based on the start time of another first frequency band that is not occupied in the first frequency band, and the second frequency band is not occupied The start time of the second frequency band time slot of the second frequency band and the start time of the third frequency band time slot that is not occupied in the third frequency band are selected to be transmitted via the second frequency band time slot with a closer start time; , The second packet contains the second control message. For the wireless receiving method described in claim 13, wherein a first packet containing the first control message and a second packet containing 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 time slot of a first frequency band that is not occupied in the first frequency band and the time slot of a second frequency band that is not occupied in the second frequency band The start time of the slot is selected to be transmitted via the first frequency band time slot with the 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 second frequency band time slot that is not occupied in the second frequency band are selected to be transmitted via the second frequency band time slot with a closer start time. For the wireless receiving method described in item 13 of the scope of the patent application, the first frequency band and the second frequency band are multiple partial bandwidths or multiple component carriers. The wireless receiving method according to claim 13, 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 Relatedly, the time slots are mini time slots or other low-latency time slots, and the time difference between the transmission time points of the first control message and the second control message can be adjusted according to an extended parameter set. For example, the wireless receiving method described in item 13 of the scope of patent application further includes: providing a plurality of candidate transmission settings, each of the candidate transmission settings has a frequency band and a time slot boundary offset, and each of the candidate transmission settings has a plurality of time slots Slots, the frequency bands of the candidate transmission settings are different, and the time slot boundary offsets of the candidate transmission settings are different, and the time slot boundary offset of each candidate transmission setting is less than the time slot time; and Receiving a first packet, the first packet being transmitted via a first selected transmission setting of one of the candidate transmission settings whose selected time delay is the lowest according to the time when the first packet is ready to be transmitted, Wherein, the frequency band of the selected first selected transmission setting is the first frequency band, and the first packet includes the first control message. The wireless receiving method described in item 21 of the scope of patent application further includes: a transmitting end pre-schedules one of the candidate transmission settings according to the time when a user 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 through the second selected transmission setting. For the wireless receiving method described in item 13 of the scope of patent application, the transmitting end is a base station or a user equipment. A base station includes: a transmission schedule selection module; and a transmission module, which is electrically connected to the transmission schedule selection module, and is controlled by the transmission schedule selection module through a first The frequency band transmits a first control message, and transmits a second control message through 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 a time slot time, and the first frequency band It is different from the second frequency band. For the base station described in item 24 of the scope of patent application, the transmission module is further used to generate a first packet based on the start time of a first frequency band time slot that is not occupied in the first frequency band and the The start time of a second frequency band time slot that is not occupied among the two frequency bands, and the first packet is selected to be transmitted through the first frequency band time slot with a closer start time; wherein, the first packet includes the first control message . For example, the base station described in claim 25, wherein the transmission module is further used to generate a second packet 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 second frequency band time slot that is not occupied in the second frequency band, and the second packet 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. For the base station described in item 24 of the scope of patent application, the transmission module is further used to generate a first packet based on the start time of a first frequency slot time slot that is not occupied in the first frequency band, and the The start time of a second frequency band time slot that is unoccupied in the two frequency bands and the start time of a third frequency band time slot that is not occupied in a third frequency band, and the first frequency band with a closer start time is selected The first packet is transmitted in a time slot; 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 The time difference between the time slot of the second frequency band and the start time of the time slot is less than one time 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. For the base station described in item 27 of the scope of patent application, the transmission module is further used to generate a second packet based on the start time of the time slot of another first frequency band that is not occupied in the first frequency band, the The start time of the second frequency band time slot that is unoccupied in the second frequency band and the start time of the third frequency band time slot that is not occupied in the third frequency band are selected via the second frequency slot with a closer start time. The frequency band time slot transmits the second packet; wherein, the second packet includes the second control message. For the base station described in item 24 of the patent application, the transmission schedule selection module is further used to obtain a first packet containing the first control message and a second packet containing 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 for determining the start time of a first frequency slot that is not occupied in the first frequency band and the unoccupied time slot of the second frequency band. The start time of a second frequency band time slot that is occupied is selected to transmit the first packet through the first frequency time slot with a closer start time; wherein, the transmission module is further used for transmitting the first packet according to the time slot in the first frequency band. The start time of another occupied first frequency band time slot and the start time of the second frequency band time slot that is not occupied in the second frequency band, select the second frequency band time slot with a closer start time to transmit The second packet. For the base station described in item 24 of the scope of patent application, the first frequency band and the second frequency band are multiple partial bandwidths or multiple component carriers. For the base station described in item 24 of the scope of patent application, wherein the number of orthogonal frequency division multiplexing symbols in the time slots 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 latency time slots, and the time difference between the transmission time points of the first control message and the second control message can be adjusted according to an extended parameter set. For the base station described in item 24 of the scope of the patent application, the transmission module is further used to provide a plurality of candidate transmission settings, each of the candidate transmission settings has a frequency band and a time slot boundary offset, and each of the candidate transmission settings has a plurality of Time slots, the frequency bands of the candidate transmission settings are different, and the time slot boundary offsets of the candidate transmission settings are different, and the time slot boundary offset of each candidate transmission setting 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 a first selected transmission setting according to the time when the first packet is ready to be transmitted, The frequency band of the selected first selected transmission setting is the first frequency band, and the first packet contains the first control message, and the transmission module is further used to transmit the first transmission setting through the first selected transmission setting. Packet to a receiving end. Such as the base station described in item 32 of the scope of patent application, wherein the transmission scheduling selection module is further used to pre-schedule the candidate transmission settings according to the time when a user uplink packet is transmitted and the network processing time of a packet One is used as a second selected transmission setting, and the transmission module is further used to transmit a second packet in response to the user uplink packet through the second selected transmission setting. For the wireless access method described in item 24 of the scope of patent application, the transmitting end is the base station or a user equipment.

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