Communication system, data transmission method thereof, and base station

Abstract

The present invention discloses a communication system, a data transmission method thereof, and a base station. The communication system includes a first base station and a second base station. The first base station includes a physical layer unit, a media access control layer unit, and a data aggregation communication protocol layer unit. The physical layer unit is used to perform transmission with a user equipment through a transmission channel. The media access control layer unit is used to determine whether a retransmission ratio of the transmission channel is higher than a first threshold value and determine whether a transmission speed of the transmission channel is lower than a second threshold value. If the retransmission ratio of the transmission channel is higher than the first threshold value and / or the transmission speed of the transmission channel is lower than the second threshold value, the first base station copies a packet and transmits the copied packet to the second base station, and uses the second base station to transmit the copied packet to the user equipment.

Description

Technical Field

[0001] The present invention relates to an electronic system, an operation method thereof, and a component, and particularly relates to a communication system, a data transmission method thereof, and a base station. Background Art

[0002] With the development of mobile communication technology, the fourth generation of mobile phone mobile communication technology standards (4G) and the fifth generation of mobile phone mobile communication technology standards (5G) have been developed. Ultra-Reliable and Low Latency Communications (uRLLC) is a characteristic standard for future mobile communication technology. This characteristic will be used in industrial and Internet of Things application scenarios with extremely high requirements for time delay and reliability. For example, fields such as autonomous driving, smart grid, VR, and factory automation.

[0003] However, in the case of a poor transmission channel, the communication system needs to spend a considerable amount of time repeating the transmission of packets, and it is difficult to meet the requirement of low latency. In addition, in the case of a poor transmission channel, many packet loss situations often occur, and it is difficult to meet the requirement of ultra-reliable.

[0004] Therefore, the industry needs to research and develop a communication technology to maintain ultra-reliable and low-latency communication. Summary of the Invention

[0005] The present invention relates to a communication system, a data transmission method thereof, and a base station, which use the technology of cooperation between a first base station and a second base station to reduce latency and improve reliability, so as to meet the requirements of ultra-reliable and low-latency communication (uRLLC).

[0006] According to a first aspect of the present invention, a communication system is provided. The communication system includes a first base station and a second base station. The first base station includes a Physical layer unit, a Medium Access Control layer unit (MAC layer unit), and a Packet Data Convergence Protocol layer unit (PDCPlayer unit). The Physical layer unit is used to perform transmission with a user equipment through a transmission channel. The Medium Access Control layer unit is used to determine whether a retransmission ratio of the transmission channel is higher than a first threshold value, and determine whether a transmission speed of the transmission channel is lower than a second threshold value. If the retransmission ratio of the transmission channel is higher than the first threshold value and / or the transmission speed of the transmission channel is lower than the second threshold value, the Medium Access Control layer unit of the first base station issues a co-transmission start instruction to cause the first base station to duplicate a packet and then transmit the duplicated packet to the second base station, and use the second base station to transmit the duplicated packet to the user equipment.

[0007] According to a second aspect of the present invention, a data transmission method for a communication system is provided. The communication system includes a first base station and a second base station. The data transmission method includes the following steps. The first base station determines whether a retransmission ratio of a transmission channel between the first base station and a user equipment is higher than a first threshold value. The first base station determines whether a transmission speed of the transmission channel is lower than a second threshold value. If the retransmission ratio of the transmission channel is higher than the first threshold value and / or the transmission speed of the data is lower than the second threshold value, the first base station issues a co-transmission start instruction to duplicate a packet and then transmit the duplicated packet to the second base station, and use the second base station to transmit the duplicated packet to the user equipment.

[0008] According to a second aspect of the present invention, a base station is provided. The base station includes a physical layer unit, a medium access control layer unit (MAC layer unit), and a packet data convergence protocol layer unit (PDCPlayer unit). The physical layer unit is configured to perform transmission with a user equipment via a transmission channel. The medium access control layer unit is configured to determine whether a retransmission ratio of the transmission channel is higher than a first threshold value, and determine whether a transmission speed of the transmission channel is lower than a second threshold value. If the retransmission ratio of the transmission channel is higher than the first threshold value and / or the transmission speed of the transmission channel is lower than the second threshold value, the medium access control layer unit issues a co-transmission start instruction, so that the base station replicates a packet and transmits the replicated packet to another base station for co-transmission, and uses the base station for co-transmission to transmit the replicated packet to the user equipment.

[0009] For a better understanding of the above and other aspects of the present invention, the following specific embodiments are given and described in detail in conjunction with the accompanying drawings: Description of the Drawings

[0010] Figure 1 The relationship diagram of a communication system and a user equipment according to an embodiment is shown;

[0011] Figure 2 The schematic diagram of a communication system and a user equipment according to an embodiment is shown;

[0012] Figure 3 The flowchart of the data transmission method of a communication system according to an embodiment is shown;

[0013] Figure 4 The schematic diagram of stopping the co-transmission program is shown; and

[0014] Figure 5 The schematic diagram of starting the co-transmission program is shown.

[0015]

Symbol Description

[0016] 1000: Communication system

[0017] 100: First base station

[0018] 110, 210: Physical layer unit (PHY layer unit)

[0019] 111, 211: Coding module

[0020] 120, 220: Medium Access Control layer unit (MAC layer unit)

[0021] 121, 221: MAC multiplexer

[0022] 122, 222: MAC scheduler

[0023] 123, 223: MAC calculator

[0024] 130, 230: Radio Link Control layer unit (RLC layer unit)

[0025] 131, 231: RCL buffer

[0026] 140, 240: Packet Data Convergence Protocol layer unit (PDCP layer unit)

[0027] 141, 241: header compression module

[0028] 142, 242: chphering module

[0029] 143: duplication module

[0030] 200: Second base station

[0031] 243: relay module

[0032] 3000: User equipment

[0033] AI: Cooperative transmission start instruction

[0034] NI: Cooperative transmission pause instruction

[0035] PH0: Inter - base - station channel

[0036] PH1: First transmission channel

[0037] PH2: Second transmission channel

[0038] PK: Packet

[0039] S110, S120, S130, S140, S150, S160, S170, S180, S190, S200, S210: Steps

[0040] T1: First critical value

[0041] T2: Second critical value

[0042] T3: Third critical value

[0043] T4: Fourth critical value

[0044] TD1: First thread

[0045] TD2: Second thread

[0046] TD3: Third thread Detailed implementation manner

[0047] Please refer to Figure 1 , which shows a relationship diagram of a communication system 1000 and a user equipment 3000 according to an embodiment. The communication system 1000 includes at least a first base station 100 and a second base station 200. The first base station 100 and the second base station 200 are, for example, a macro cell or a small cell, and the small cell is, for example, a femtocell, a picocell, and a microcell. A user equipment 3000 is located within the transmission coverage ranges of the first base station 100 and the second base station 200. The user equipment 3000 is, for example, a mobile phone, a tablet, a notebook computer, etc. There is a first transmission channel PH1 between the first base station 100 and the user equipment 3000. There is a second transmission channel PH2 between the second base station 200 and the user equipment 3000.

[0048] The user equipment 3000 can perform transmission with the first base station 100 through the first transmission channel PH1. When the first transmission channel PH1 is in good condition, it is easy to meet the requirements of ultra-reliable low-latency communication (uRLLC). However, when the first transmission channel PH1 is in poor condition, the first base station 100 needs to spend a considerable amount of time repeating the transmission of packets, and there will also be many packet loss situations at the first base station 100, making it difficult to meet the requirements of ultra-reliable low-latency communication (uRLLC).

[0049] This embodiment uses the technology of collaborative cooperation between the first base station 100 and the second base station 200 to reduce latency and improve reliability, so as to meet the requirements of ultra-reliable low-latency communication (uRLLC). Please refer to Figure 2 , which shows a schematic diagram of a communication system 1000 and a user equipment 3000 according to an embodiment. The communication system 1000 includes a first base station 100 and a second base station 200. The first base station 100 includes a Physical layer unit (PHY layer unit) 110, a Medium Access Control layer unit (MAC layer unit) 120, a Radio Link Control layer unit (RLC layer unit) 130, and a Packet Data Convergence Protocol layer unit (PDCP layer unit) 140. The second base station 200 includes a Physical layer unit (PHY layer unit) 210, a Medium Access Control layer unit (MAC layer unit) 220, a Radio Link Control layer unit (RLC layer unit) 230, and a Packet Data Convergence Protocol layer unit (PDCP layer unit) 240. The Physical layer units (PHY layer units) 110, 210, the Medium Access Control layer units (MAC layer units) 120, 220, the Radio Link Control layer units (RLC layer units) 130, 230, and the Packet Data Convergence Protocol layer units (PDCP layer units) 140, 240 are hierarchical checkpoints under the communication protocol, such as a circuit, a chip, a circuit board, an array of program codes, or a storage device storing program codes.

[0050] There is an inter - base - station channel PH0 between the first base station 100 and the second base station 200. There is a first transmission channel PH1 between the first base station 100 and the user equipment 3000. There is a second transmission channel PH2 between the second base station 200 and the user equipment 3000. When the state of the first transmission channel PH1 is good, the packet PK received by the first base station 100 can be transmitted to the user equipment 3000 through the first transmission channel PH1. When the state of the first transmission channel PH1 is bad, the packet PK received by the first base station 100 can be transmitted to the second base station 200 through the inter - base - station channel PH0, and then the second base station 200 transmits it to the user equipment 3000 through the second transmission channel PH2. In this way, the communication system 1000 can reduce latency and improve reliability through the cooperation of the first base station 100 and the second base station 200 to meet the requirements of ultra - reliable low - latency communication (uRLLC).

[0051] Please refer to Figures 3 - 5 , Figure 3 a flowchart showing the data transmission method of the communication system 1000 according to an embodiment, Figure 4 a schematic diagram showing the stop of the cooperative transmission program, Figure 5 a schematic diagram showing the start of the cooperative transmission program. As Figure 4 shown, the packet data convergence protocol (PDCP) layer unit 140 includes a header compression module 141, a ciphering module 142, and a duplication module 143. The radio link control (RLC) layer unit 130 includes a RLC buffer 131. The media access control (MAC) layer unit 120 includes a MAC multiplexer 121, a MAC scheduler 122, and a MAC calculator 123. The MAC scheduler 122 of the MAC layer unit 120 is used to arrange the transmission of the packet PK. The MAC calculator 123 of the MAC layer unit 120 is used to analyze the information of the first transmission channel PH1 (such as the re - transmission ratio and transmission speed). The physical (PHY) layer unit 110 includes a coding module 111. The PHY layer unit 110 is used to transmit with the user equipment 3000 through the first transmission channel PH1.

[0052] The Packet Data Convergence Protocol (PDCP) layer unit 240 includes a header compression module 241, a ciphering module 242, and a relay module 243. The Radio Link Control (RLC) layer unit 230 includes a RLC buffer 231. The Medium Access Control (MAC) layer unit 220 includes a MAC multiplexer 221, a MAC scheduler 222, and a MAC calculator 223. The Physical (PHY) layer unit 210 includes a coding module 211. The PHY layer unit 210 is used to perform transmission with the user equipment 3000 via the second transmission channel PH2.

[0053] Please refer to Figure 3 and Figure 4 In step S110, the MAC calculator 123 of the first base station 100 determines whether the retransmission ratio of the first transmission channel PH1 between the first base station 100 and the user equipment 3000 is higher than a first threshold value T1. If the retransmission ratio of the first transmission channel PH1 is higher than the first threshold value T1, then step S130 is entered; if the retransmission ratio of the first transmission channel PH1 is not higher than the first threshold value T1, then step S120 is entered.

[0054] In step S120, the MAC calculator 123 of the first base station 100 determines whether the transmission speed of the first transmission channel PH1 is lower than a second threshold value T2. If the transmission speed of the first transmission channel PH1 is lower than the second threshold value T2, then step S130 is entered; if the transmission speed of the first transmission channel PH1 is not lower than the second threshold value T2, then the process returns to step S110.

[0055] That is to say, when the retransmission ratio of the first transmission channel PH1 is higher than the first threshold value T1 and / or the transmission speed of the first transmission channel PH1 is lower than the second threshold value T2, the process will enter step S130.

[0056] The order of the above steps S110 and S120 can be swapped, not limited to the Figure 3 example.

[0057] In step S130, the Medium Access Control (MAC) calculator 123 of the first base station 100 issues a cooperative transmission start instruction AI to the duplication module 143.

[0058] Then, in step S140, the duplication module 143 of the first base station 100 duplicates the packet PK and transmits the duplicated packet PK to the second base station 200 through the inter-base-station channel PH0.

[0059] Next, in step S150, the relay module 243 of the second base station 200 receives the duplicated packet PK.

[0060] Then, in step S160, the second base station 200 transmits the duplicated packet PK to the user equipment 3000 through the second transmission channel PH2.

[0061] Through the above steps S110 - S160, when the state of the first transmission channel PH1 is poor, the packet PK received by the first base station 100 can be transmitted to the second base station 200 through the inter-base-station channel PH0, and then the second base station 200 transmits it to the user equipment 3000 through the second transmission channel PH2.

[0062] Next, please refer to Figure 3 and Figure 5 , in step S170, the Medium Access Control (MAC) calculator 123 of the first base station 100 determines whether the retransmission ratio of the first transmission channel PH1 is lower than a third threshold value T3. If the retransmission ratio of the first transmission channel PH1 is lower than the third threshold value T3, it proceeds to step S180; if the retransmission ratio of the first transmission channel PH1 is not lower than the third threshold value T3, it returns to step S180. The third threshold value T3 is less than the first threshold value T1.

[0063] Then, in step S180, the Medium Access Control (MAC) calculator 123 of the first base station 100 determines whether the transmission speed of the first transmission channel PH1 is higher than a fourth threshold value T4. If the transmission speed of the first transmission channel PH1 is higher than the fourth threshold value T4, it proceeds to step S190; if the transmission speed of the first transmission channel PH1 is not higher than the fourth threshold value T4, it returns to step S170. The fourth threshold value T4 is greater than the second threshold value T2.

[0064] That is to say, when the retransmission ratio of the first transmission channel PH1 is lower than the third threshold value T3 and the transmission speed of the first transmission channel PH1 is higher than the fourth threshold value T4, the process will proceed to step S190.

[0065] The order of the above-mentioned step S170 and step S180 can be swapped, not limited to Figure 3 the example of

[0066] In step 190, the Media Access Control calculator (MAC calculator) 123 of the first base station 100 issues a co-transmission pause instruction NI to pause the action of replicating the packet PK and transmitting the replicated packet PK to the second base station 200.

[0067] In step S200, the second base station 200 stops transmitting the replicated packet PK.

[0068] In step S210, the first base station 100 transmits the packet PK to the user equipment 3000 through the first transmission channel PH1.

[0069] Through the above steps S170 - S210, when the state of the first transmission channel PH1 is good, the packet PK received by the first base station 100 does not need to be replicated and transmitted to the second base station 200, and the first base station 100 can transmit it to the user equipment 3000 through the first transmission channel PH1.

[0070] After step S210, the process returns to step S110. The state of the first transmission channel PH1 will be re-checked again. As long as the state of the first transmission channel PH1 is bad, the second base station 200 is used to transmit the replicated packet PK to the user equipment 3000; as long as the state of the first transmission channel PH1 is good, the first base station 100 is used to transmit the packet PK to the user equipment 3000.

[0071] More specifically, as Figure 4 and Figure 5 shown, the Media Access Control calculator 123 of the Media Access Control layer unit 120 includes a first thread TD1, a second thread TD2 and a third thread TD3. The first thread TD1 is used to issue a co-transmission start instruction AI when the retransmission ratio of the first transmission channel PH1 is higher than the first critical value T1. The second thread TD2 is used to issue a co-transmission start instruction AI when the transmission speed of the first transmission channel PH1 is lower than the second critical value T2. The third thread TD3 is used to issue a co-transmission pause instruction NI when the retransmission ratio of the first transmission channel PH1 is lower than the third critical value T3 and the transmission speed of the first transmission channel PH1 is higher than the fourth critical value T4.

[0072] The first thread TD1, the second thread TD2 and the third thread TD3 only need to be loaded into the first base station 100, and do not need to be loaded into the second base station 200 to complete the technology of this embodiment.

[0073] In summary, the present embodiment can reduce latency and improve reliability through the technology of the cooperation between the first base station 100 and the second base station 200 to meet the requirements of ultra-reliable and low-latency communication (uRLLC).

[0074] In summary, although the present invention has been disclosed above in embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the appended claims.

Claims

1. A communication system, comprising: A first base station, comprising: A physical layer unit for transmitting with a user equipment through a transmission channel; A media access control layer unit for determining whether a retransmission ratio of the transmission channel is higher than a first threshold value and determining whether a transmission speed of the transmission channel is lower than a second threshold value; and A data aggregation communication protocol layer unit; and A second base station; wherein, if the retransmission ratio of the transmission channel is higher than the first threshold value and / or the transmission speed of the transmission channel is lower than the second threshold value, the media access control layer unit of the first base station issues a co - transmission start instruction, so that the first base station copies a packet and transmits the copied packet to the second base station, and uses the second base station to transmit the copied packet to the user equipment; wherein the media access control layer unit is further used for determining whether the retransmission ratio of the transmission channel is lower than a third threshold value and determining whether the transmission speed of the transmission channel is higher than a fourth threshold value; wherein if the retransmission ratio of the transmission channel is lower than the third threshold value and the transmission speed of the transmission channel is higher than the fourth threshold value, the media access control layer unit issues a co - transmission pause instruction to pause the actions of copying the packet and transmitting the copied packet to the second base station.

2. The communication system according to claim 1, wherein the third threshold value is less than the first threshold value.

3. The communication system according to claim 1, wherein the fourth threshold value is greater than the second threshold value.

4. The communication system according to claim 1, wherein the media access control layer unit comprises a media access control calculation module, and the media access control calculation module has a first thread, and the first thread is used for issuing the co - transmission start instruction when the retransmission ratio of the transmission channel is higher than the first threshold value.

5. The communication system according to claim 4, wherein the media access control calculation module further has a second thread, and the second thread is used for issuing the co - transmission start instruction when the transmission speed of the transmission channel is lower than the second threshold value.

6. The communication system according to claim 5, wherein the media access control calculation module further has a third thread, and the third thread is used for issuing the co - transmission pause instruction when the retransmission ratio of the transmission channel is lower than the third threshold value and the transmission speed of the transmission channel is higher than the fourth threshold value.

7. A data transmission method for a communication system, the communication system comprising a first base station and a second base station, the data transmission method comprising: The first base station determines whether a retransmission ratio of a transmission channel between the first base station and the user equipment is higher than a first threshold value; The first base station determines whether a transmission speed of the transmission channel is lower than a second threshold value; If the retransmission ratio of the transmission channel is higher than the first threshold value and / or the transmission speed of the data is lower than the second threshold value, the first base station issues a co - transmission start instruction to copy a packet and transmit the copied packet to the second base station, and uses the second base station to transmit the copied packet to the user equipment, wherein, the data transmission method further comprises: The first base station determines whether the retransmission ratio of the transmission channel is lower than a third threshold value; The first base station determines whether the transmission speed of the transmission channel is higher than a fourth threshold value; If the retransmission ratio of the transmission channel is lower than the third threshold value and the transmission speed of the transmission channel is higher than the fourth threshold value, the first base station issues a cooperative transmission suspension instruction to suspend the actions of copying the packet and transmitting the copied packet to the second base station.

8. The data transmission method of the communication system according to claim 7, wherein the third threshold value is less than the first threshold value.

9. The data transmission method of the communication system according to claim 7, wherein the fourth threshold value is greater than the second threshold value.

10. The data transmission method of the communication system according to claim 7, wherein the first base station has a first thread, and the first thread is used to issue the cooperative transmission start instruction when the retransmission ratio of the transmission channel is higher than the first threshold value.

11. The data transmission method of the communication system according to claim 10, wherein the first base station further has a second thread, and the second thread is used to issue the cooperative transmission start instruction when the transmission speed of the transmission channel is lower than the second threshold value.

12. The data transmission method of the communication system according to claim 11, wherein the first base station further has a third thread, and the third thread is used to issue the cooperative transmission suspension instruction when the retransmission ratio of the transmission channel is lower than the third threshold value and the transmission speed of the data is higher than the fourth threshold value.

13. A base station comprising: a physical layer unit for transmitting with a user equipment through a transmission channel; a media access control layer unit for determining whether the retransmission ratio of the transmission channel is higher than a first threshold value and determining whether the transmission speed of the transmission channel is lower than a second threshold value; and a data aggregation communication protocol layer unit; wherein, if the retransmission ratio of the transmission channel is higher than the first threshold value and / or the transmission speed of the transmission channel is lower than the second threshold value, the media access control layer unit issues a cooperative transmission start instruction to cause the base station to copy a packet and then transmit the copied packet to another base station for cooperative transmission, and use the base station for cooperative transmission to transmit the copied packet to the user equipment; wherein the media access control layer unit is further used to determine whether the retransmission ratio of the transmission channel is lower than a third threshold value and determine whether the transmission speed of the transmission channel is higher than a fourth threshold value; wherein if the retransmission ratio of the transmission channel is lower than the third threshold value and the transmission speed of the transmission channel is higher than the fourth threshold value, the media access control layer unit issues a cooperative transmission suspension instruction to suspend the actions of copying the packet and transmitting the copied packet to the base station for cooperative transmission.

14. The base station according to claim 13, wherein the third threshold value is less than the first threshold value.

15. The base station according to claim 13, wherein the fourth threshold value is greater than the second threshold value.

16. The base station according to claim 13, wherein the media access control layer unit includes a media access control calculation module, and the media access control calculation module has a first thread, and the first thread is used to issue the cooperative transmission start instruction when the retransmission ratio of the transmission channel is higher than the first threshold value.

17. The base station according to claim 16, wherein the medium access control calculation module further has a second thread, and the second thread is used to issue the co - transmission start instruction when the transmission speed of the transmission channel is lower than the second threshold value.

18. The base station according to claim 17, wherein the medium access control calculation module further has a third thread, and the third thread is used to issue the co - transmission pause instruction when the re - transmission ratio of the transmission channel is lower than the third threshold value and the transmission speed of the data is higher than the fourth threshold value.

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