Communication method and communication system for determining a transmission scheme in dependence on at least one time parameter

Abstract

A communication method of determining a transmission scheme according to at least one time parameter, comprising providing a communication device, a first transceiver and a second transceiver, obtaining at least one time parameter, establishing a first link between the communication device and the first transceiver during a first time slot according to the at least one time parameter, and establishing a second link between the communication device and the second transceiver during a second time slot according to the at least one time parameter. The first time slot and the second time slot do not overlap.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a communication method and a communication system for determining a transmission scheme, and more particularly, to a communication system for determining a transmission scheme according to at least one time parameter. BACKGROUND

[0002] With rapid technological advances, some fifth generation (5G) communications are being developed and are becoming a trend for future telecommunication or mobile technology. For example, ultra-reliable low-latency communications (URLLC) is one of several different types of use cases supported by the 5G new radio (NR) standard. URLLC also introduces some physical layer enhancement methods according to the 5G NR standard. In general, URLLC with the 5G NR standard can be applied to various entertainment communications and industry communications, such as augmented reality (AR) communications, virtual reality (VR) communications, factory automation communications, transportation industry communications, and power distribution communications. The goal of the physical layer enhancement method of URLLC with the 5G NR standard is to provide high reliability (e.g., error rate of 10 -6 -6) and short latency (e.g., 0.5-1 millisecond).

[0003] In NR with multiple transmission and reception points (TRPs), a user equipment (UE) can communicate with multiple TRPs that are physically separated at different locations simultaneously. However, when the UE transmits signals to two TRPs simultaneously, channel conditions can change rapidly, resulting in performance degradation of the same transmission scheme. Specifically, for millimeter wave (mm-Wave) systems, transmitted and received signals are processed using beamforming techniques to improve communication performance. However, for mm-Wave systems, signals can suffer from sudden temporal characteristic changes or even link quality degradation due to blocking problems. These blocking problems also depend on the locations of the TRPs and the UE. Therefore, developing an adaptive transmission scheme that changes over time for a multi-TRP system is an important design problem. SUMMARY

[0004] In one embodiment of the present application, a communication method for determining a transmission scheme according to at least one time parameter is disclosed. The communication method comprises providing a communication device, a first transceiver and a second transceiver, obtaining at least one time parameter, establishing a first link between the communication device and the first transceiver during a first time slot according to the at least one time parameter, and establishing a second link between the communication device and the second transceiver during a second time slot according to the at least one time parameter. The first time slot and the second time slot do not overlap.

[0005] In another embodiment of the present application, a communication system for determining a transmission scheme according to at least one time parameter is disclosed. The communication system comprises a communication device, a first transceiver and a second transceiver. The first transceiver is configured to communicate with the communication device. The second transceiver is configured to communicate with the communication device. After obtaining at least one time parameter, a first link between the communication device and the first transceiver is established during a first time slot according to the at least one time parameter. A second link between the communication device and the second transceiver is established during a second time slot according to the at least one time parameter. The first time slot and the second time slot do not overlap.

[0006] According to the communication method and the communication system for determining a transmission scheme according to at least one time parameter provided by the present application, channel condition deterioration can be avoided and transmission performance can be maintained. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a diagram of a communication system for determining a transmission scheme during a first time slot according to an embodiment of the present application.

[0008] Figure 2 is a diagram of a communication system for determining a transmission scheme during a second time slot of Figure 1

[0009] Figure 3 illustrates a predetermined sequence for determining a transmission scheme of a communication system in Figure 1

[0010] Figure 4 is a flowchart of a communication method for determining a transmission scheme performed by a communication system in Figure 1 DETAILED DESCRIPTION

[0011] Figure 1 ​​​is an illustration of a communication system 100 for determining a transmission scheme during a first time slot according to an embodiment of the application. The communication system 100 comprises a communication device UE, a first transceiver TRP1 and a second transceiver TRP2. The communication device UE can be any portable, mobile or fixed communication device capable of transmitting and receiving wireless signals. The first transceiver TRP1 and the second transceiver TRP2 can be two communication terminals capable of performing an uplink data transmission procedure and a downlink data transmission procedure with the communication device UE. The first transceiver TRP1 can be configured to communicate with the communication device UE in a Time Division Duplexing (TDD) mode or a Frequency Division Duplexing (FDD) mode. The second transceiver TRP2 can be configured to communicate with the communication device UE in a TDD mode or a FDD mode. In the communication system 100, after obtaining at least one time parameter, a first link LI can be established between the communication device UE and the first transceiver TRP1 during a first time slot according to the at least one time parameter. Then, a second link L2 can be established between the communication device UE and the second transceiver TRP2 during a second time slot according to the at least one time parameter. The first time slot and the second time slot do not overlap.

[0012] For example, in Figure 1 During the first time slot, a first link LI is established between the communication device UE and the first transceiver TRP1. After the establishment of the first link LI between the communication device UE and the second transceiver TRP2, a second link L2 between the communication device UE and the first transceiver TRP1 is blocked. Then, the communication device can transmit data to the first transceiver TRP1 through the first link LI at a first coding rate R1 during the first time slot. Since the second link L2 between the communication device UE and the second transceiver TRP2 is blocked, the second coding rate R2 can be considered as zero throughput (R2 = 0).

[0013] Figure 2 During the second time slot, a second link L2 is established between the communication device UE and the second transceiver TRP2. Then, the communication device can transmit data to the second transceiver TRP2 through the second link L2 at a second coding rate R2 during the second time slot. Since the first link LI between the communication device UE and the first transceiver TRP1 is blocked, the first coding rate R1 can be considered as zero throughput. In Figure 1 and Figure 2In some embodiments, the first coding rate R1 and the second coding rate R2 are different. In the communication system 100, the communication device UE can use different coding rates (R1 and R2) to send the same data to the first transceiver TRP1 and the second transceiver TRP2 during different time slots to enhance signal reliability. In addition, in the communication system 100, several transmission schemes can be introduced according to at least one time parameter. The at least one time parameter is related to the mapping defined by the table. The at least one time parameter can be dynamically changed by channel conditions or signal strength, as shown below.

[0014] In the first mode, the transmission scheme can be determined according to the transmission configuration indicator information (TCI). For example, the at least one time parameter can include the TCI measured by the communication device UE. The TCI can be regarded as a measurement indicator, including various environmental parameters such as channel response, channel state information and signal-to-noise ratio. When the first link L1 is established according to the TCI during the first time slot, the channel capacity of the first link L1 is higher than that of the second link L2. Conversely, when the second link L2 is established according to the TCI during the second time slot, the channel capacity of the second link L2 is higher than that of the first link L1. Therefore, since the communication system 100 can adaptively select a satisfactory link to perform high-reliability data transmission, the communication reliability of the communication system 100 can be improved.

[0015] In the second mode, the at least one time parameter can comprise a downlink control information (DCI) from a physical downlink control channel (PDCCH) received by the user equipment (UE). The communication device (UE) can dynamically switch the link between the first link (L1) and the second link (L2) through the DCI. Therefore, the transmission scheme can be dynamically switched and can be informed to the first transceiver (TRP1) or the second transceiver (TRP2) through the DCI. For the single DCI case (i.e., if one DCI resource is transmitted from the first transceiver (TRP1) and the second transceiver (TRP2)), the at least one time parameter comprises an order of a sequence of redundant versions (RVs) of the DCI from the PDCCH. For example, the order of the sequence of RVs can be an order of incremental redundancy segments of a turbo code applied to an error correction code word. Furthermore, the communication device (UE) can indicate a number of repetitions and resource allocation according to the sequence of RVs to switch the appropriate link between the first link (L1) and the second link (L2). Moreover, the RV identity in the DCI represents two different or the same RVs as a pair. A first element of the pair can be applied to the first TCI state. A second element of the pair can be applied to the second TCI state. Therefore, since the first link (L1) and the second link (L2) are conditionally established, the signal reliability of the communication system (100) can be improved.

[0016] Figure 3 A predetermined sequence for determining the transmission scheme of the communication system (100) is illustrated. In the third mode, a “semi-static” exchange-based transmission scheme can be introduced into the communication system (100). The at least one time parameter comprises the predetermined sequence. The predetermined sequence comprises allocation information of the link establishment over time. For example, in the third mode, the predetermined sequence can be a sequence of time slots (TSs) in which the first link (L1) and the second link (L2) are established. The predetermined sequence can be a sequence of time slots (TSs) in which the first link (L1) and the second link (L2) are not established. The predetermined sequence can be a sequence of time slots (TSs) in which the first link (L1) and the second link (L2) are established. The predetermined sequence can be a sequence of time slots (TSs) in which the first link (L1) and the second link (L2) are not established. Figure 3In the example, the predetermined sequence indicates allocation information for link establishment during eight time slots. During a first time slot (T=1), a first link LI between the communication device UE and the first transceiver TRP1 is established, indicated by the pointer "0". During a second time slot (T=2), the first link LI between the communication device UE and the first transceiver TRP1 is established, indicated by the pointer "0". During a third time slot (T=3), a second link L2 between the communication device UE and the second transceiver TRP2 is established, indicated by the pointer "1". During a fourth time slot (T=4), the first link LI between the communication device UE and the first transceiver TRP1 is established, indicated by the pointer "0". During a fifth time slot (T=5), the second link L2 between the communication device UE and the second transceiver TRP2 is established, indicated by the pointer "1". During a sixth time slot (T=6), the second link L2 between the communication device UE and the second transceiver TRP2 is established, indicated by the pointer "1". During a seventh time slot (T=7), the first link LI between the communication device UE and the first transceiver TRP1 is established, indicated by the pointer "0". During an eighth time slot (T=8), the second link L2 between the communication device UE and the second transceiver TRP2 is established, indicated by the pointer "1". The predetermined sequence can be considered as a related mapping table saved in the communication device UE.

[0017] Figure 4 is a flowchart of a communication method for determining a transmission scheme performed by the communication system 100. The communication method can comprise steps S401 to S404. Any reasonable technical modification is within the scope of the present application. Steps S401 to S404 are explained below.

[0018] Step S401: providing a communication device UE, a first transceiver TRP1 and a second transceiver TRP2.

[0019] Step S402: obtaining at least one time parameter;

[0020] Step S403: establishing, according to the at least one time parameter, a first link LI between the communication device UE and the first transceiver TRP1 during a first time slot.

[0021] Step S404: establishing, according to the at least one time parameter, a second link L2 between the communication device UE and the second transceiver during a second time slot.

[0022] The details of steps S401 to S404 have been explained previously. Therefore, they are omitted here. In the communication system 100, instead of simultaneously communicating with the communication device UE by two transceivers (TRP1 and TRP2), a proper link between the communication device and one of the two transceivers (TRP1 and TRP2) is selected to transmit data. Therefore, when the channel condition changes rapidly, the transmission performance of the same communication scheme can be avoided.

[0023] In summary, the present disclosure discloses a communication method and a communication system for determining a transmission scheme according to at least one time parameter. The communication system can obtain the at least one time parameter from a TCI state, a DCI state, an RV sequence and / or a predefined sequence. Instead of simultaneously communicating with the communication device by two transceivers, the communication system can dynamically select only one proper link between one transceiver and the communication device to avoid channel condition degradation. Therefore, when the channel condition changes rapidly, the transmission performance can be maintained.

Claims

1. A communication method for determining a transmission scheme according to at least one time parameter, for communication between a communication device, a first transceiver and a second transceiver, comprising: obtaining at least one time parameter, the at least one time parameter comprising a predetermined sequence, and the predetermined sequence comprising allocation information of link establishment over time; establishing a first link between the communication device and the first transceiver during a first time slot according to the at least one time parameter; and establishing a second link between the communication device and the second transceiver during a second time slot according to the at least one time parameter; wherein the first time slot and the second time slot do not overlap.

2. The method of claim 1, further comprising: blocking the first link between the communication device and the first transceiver after establishing the second link between the communication device and the second transceiver.

3. The method of claim 1, further comprising: transmitting data from the communication device to the first transceiver through the first link with a first coding rate during the first time slot; and transmitting the data from the communication device to the second transceiver through the second link with a second coding rate during the second time slot; wherein the first coding rate and the second coding rate are different, and the at least one time parameter is associated with a mapping relevance of table definition.

4. A communication system for determining a transmission scheme according to at least one time parameter, comprising: a communication device; a first transceiver configured to communicate with the communication device; and a second transceiver configured to communicate with the communication device; wherein, after obtaining the at least one time parameter, a first link between the communication device and the first transceiver is established during a first time slot according to the at least one time parameter, a second link between the communication device and the second transceiver is established during a second time slot according to the at least one time parameter, and the first time slot and the second time slot do not overlap, the at least one time parameter comprising a predetermined sequence, and the predetermined sequence comprising allocation information of link establishment over time. blocking the first link between the communication device and the first transceiver after establishing the second link between the communication device and the second transceiver. the communication device transmitting data to the first transceiver through the first link with a first coding rate during the first time slot, the communication device transmitting the data to the second transceiver through the second link with a second coding rate during the second time slot, the first coding rate and the second coding rate being different, and the at least one time parameter being associated with a mapping relevance of table definition. ​ 5. The system of claim 4, wherein, ​ 6. The system of claim 4, wherein, ​

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