CN110351775B - Method and system for processing beam indication in 5G communication - Google Patents
Method and system for processing beam indication in 5G communication Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H04W28/00—Network traffic management; Network resource management
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- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H04W72/0446—Resources in time domain, e.g. slots or frames
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Abstract
The application discloses a method and a system for processing beam indication in 5G communication, which relate to the technical field of mobile communication, wherein the method comprises the following steps: in a high frequency band, a base station transmits data in a beam scanning mode; after the terminal is accessed, the base station and the terminal establish a beam link for data transmission according to the uplink and downlink measurement results; in the time slot N-1, the base station and the terminal adopt a first MCS to carry out data transmission through a first beam; in the time slot N, the base station adjusts the wave beam into a second wave beam and determines the time length of the GAP; selecting a first specific time slot and a second specific time slot, wherein the first specific time slot is positioned in the GAP duration, and in the first specific time slot, sending PDSCH data to a terminal through a first wave beam by adopting a smaller second MCS; and in a second specific time slot, actively retransmitting the PDSCH data to the terminal through a second wave beam by adopting a larger third MCS. By the scheme, resources in the GAP can be effectively utilized, the effective utilization rate of the resources is ensured, and the data receiving performance is ensured.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method and a system for processing beam indication in 5G communications.
Background
With the commercialization of fourth-Generation mobile communication technology and the continuous growth of mobile services, research work for fifth-Generation mobile communication technology (5th-Generation, 5G) has been started worldwide. 5G is a multi-technology converged communication, and meets the requirements of wide data and connection services through technology alternation and innovation. In RAN #71 conference, the third Generation Partnership Project (3rd Generation Partnership Project, 3GPP) established a Study Item (SI) for the 5G new air interface study. According to the 5G division of vertical services, the 3GPP mainly studies the 5G new air interface technology from three aspects, namely enhanced wireless broadband (eMBB), low-latency high-reliability communications (URLLC) and large-scale machine type communications (mtc).
In the communication process, the base station informs the terminal of the relation between the DMRS of the PDCCH and which downlink RSs are QCLs in a mode of RRC signaling or MAC CE, the relation between the downlink PDSCH and which downlink RSs are QCLs is indicated through a TCI field carried in the DCI, and the terminal can be used for adjusting receiving beams of the PDCCH and the PDSCH after acquiring the indication.
However, when the channel of the terminal changes, the base station needs to indicate the beam of the PDSCH by carrying the TCI in the DCI. For the terminal, after receiving downlink data, it needs to decode DCI first and then determine how to update the receive beam, which may cause a GAP phenomenon in receiving PDSCH, that is, the terminal may not update the receive beam accurately before acquiring the TCI indication, thereby causing a decrease in data reception performance during this period.
Disclosure of Invention
In view of this, the present application provides a method and a system for processing a beam indication in 5G communication, which can determine a GAP duration, and perform data transmission through a first beam using a second MCS that is lower in a first specific time slot according to the GAP duration, on one hand, resources in the GAP are effectively utilized, and an effective utilization rate of the resources is ensured, and on the other hand, a receiving performance of data can be ensured to the maximum extent under a condition that a terminal does not obtain the beam indication.
In order to solve the technical problem, the following technical scheme is adopted:
in a first aspect, the present application provides a method for processing beam indication in 5G communication, including:
in a high frequency band, a base station sends SS Block and RMSI in a beam scanning mode; after the terminal is accessed, the base station and the terminal establish a beam link for data transmission according to the uplink and downlink measurement results;
in a time slot N-1, a base station and a terminal adopt a first MCS to carry out data transmission through a first beam, wherein N is a positive integer and is more than or equal to 2;
in a time slot N, the base station determines a transmission beam of downlink PDSCH data needing to be adjusted according to a measurement result reported by the terminal, the adjusted transmission beam is a second beam, DCI information is transmitted to the terminal, the terminal is informed through a TCI field in the DCI, meanwhile, a GAP time length is determined according to the terminal capability and a current parameter set, and the GAP time length is the absolute time from the time when the terminal receives PDCCH data to the time when TCI analysis is completed;
selecting a first specific time slot and a second specific time slot according to the GAP time length, wherein the first specific time slot is located in a time slot range corresponding to the GAP time length, and in the first specific time slot, sending PDSCH data to a terminal through a first wave beam by adopting a second MCS, and the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to a terminal through the second wave beam by adopting a third MCS, wherein the third MCS is larger than the second MCS;
after receiving downlink data, the terminal receives PDSCH data by adopting a first wave beam in the first specific time slot, and simultaneously receives PDSCH data actively retransmitted by the base station by adopting a third MCS through a second wave beam in a second specific time slot;
and when the data received by the first wave beam fails to be decoded, carrying out HARQ combination by using the received PDSCH data actively retransmitted to obtain a decoding result.
Optionally, wherein:
when the GAP duration is less than 1 timeslot, assuming that the timeslot N includes a continuous first sub-symbol set and a continuous second sub-symbol set, where the GAP duration is equal to the first sub-symbol set, at this time, a first specific timeslot is the first sub-symbol set, and a second specific timeslot is the second sub-symbol set;
selecting a first specific time slot and a second specific time slot according to the GAP duration, and sending PDSCH data to a terminal through a first beam by adopting a second MCS in the first specific time slot, wherein the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to the terminal through the second beam by using a third MCS, further:
in the first sub-symbol set, sending PDSCH data to the terminal through a first wave beam by adopting a second MCS; in the second sub-symbol set, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS; and simultaneously sending two independent DCIs to the terminal to indicate two scheduled time-frequency positions.
Optionally, wherein:
after the terminal receives the downlink data, in the first specific time slot, receiving the data by using the first beam, and at the same time, in the second specific time slot, receiving the PDSCH data actively retransmitted by the base station by using the third MCS through the second beam, further:
after the terminal receives the downlink data, the DCI is detected in a blind mode, and the TCI is analyzed and the receiving beam is adjusted when the first sub-symbol set is finished; meanwhile, in the first sub-symbol set, adopting a first beam to receive data; and in the second sub-symbol set, receiving PDSCH data actively retransmitted by the base station through a second beam by adopting a third MCS.
Optionally, wherein:
assuming that each time slot correspondingly comprises a symbol set, when the GAP time length is an integer of the symbol sets, the first specific time slot is each symbol set corresponding to the GAP time length, and the second specific time slot is a time slot after the last symbol set corresponding to the GAP time length;
selecting a first specific time slot and a second specific time slot according to the GAP duration, and sending PDSCH data to a terminal through a first beam by adopting a second MCS in the first specific time slot, wherein the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to the terminal through the second beam by using a third MCS, further:
in each symbol set corresponding to the GAP duration, adopting a second MCS to respectively send independent PDSCH to the terminal through the first wave beam; and in a time slot after the last symbol set corresponding to the GAP time length, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS.
Optionally, wherein:
after the terminal receives the downlink data, in the first specific time slot, receiving the data by using the first beam, and at the same time, in the second specific time slot, receiving the PDSCH data actively retransmitted by the base station by using the third MCS through the second beam, further:
after the terminal receives the downlink data, the DCI is detected in a blind mode, and the analysis of the TCI and the adjustment of the receiving wave beam are completed when the symbol set corresponding to the GAP time length is finished; meanwhile, in a symbol set corresponding to the GAP duration, receiving data through the first wave beam by adopting a second MCS; and in a time slot after the last symbol set corresponding to the GAP time length, receiving PDSCH data actively retransmitted by the base station by a second wave beam by adopting a third MCS.
In a second aspect, the present application provides a beam indication processing system in 5G communication, including: a base station and a terminal;
the base station is used for sending SS Block and RMSI in a high-frequency time period in a beam scanning mode, and establishing a beam link for data transmission according to uplink and downlink measurement results after the terminal is accessed; in a time slot N-1, a first MCS is adopted to carry out data transmission through a first beam, wherein N is an integer and is more than or equal to 2; in a time slot N, the base station determines a transmission beam of downlink PDSCH data needing to be adjusted according to a measurement result reported by the terminal, the adjusted transmission beam is a second beam, DCI information is transmitted to the terminal, the terminal is informed through a TCI field in the DCI, meanwhile, a GAP time length is determined according to the terminal capability and a current parameter set, and the GAP time length is the absolute time from the time when the terminal receives PDCCH data to the time when TCI analysis is completed; the method further comprises the steps of selecting a first specific time slot and a second specific time slot according to the GAP time length, wherein the first specific time slot is located in a time slot range corresponding to the GAP time length, and sending PDSCH data to a terminal through a first beam by adopting a second MCS in the first specific time slot, wherein the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to a terminal through the second wave beam by adopting a third MCS, wherein the third MCS is larger than the second MCS;
the terminal is used for receiving downlink data, and after receiving the downlink data, in the first specific time slot, receiving PDSCH data by adopting a first wave beam, and simultaneously in a second specific time slot, receiving PDSCH data actively retransmitted by the base station by adopting a third MCS through a second wave beam; and when the data received by the first wave beam fails to be decoded, the terminal utilizes the received PDSCH data actively retransmitted to carry out HARQ combination to obtain a decoding result.
Optionally, wherein:
when the GAP duration is less than 1 timeslot, assuming that the timeslot N includes a continuous first sub-symbol set and a continuous second sub-symbol set, where the GAP duration is equal to the first sub-symbol set, at this time, a first specific timeslot is the first sub-symbol set, and a second specific timeslot is the second sub-symbol set;
the base station is used for sending PDSCH data to the terminal through a first wave beam by adopting a second MCS in the first sub-symbol set; in the second sub-symbol set, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS; and simultaneously sending two independent DCIs to the terminal to indicate two scheduled time-frequency positions.
Optionally, wherein:
the terminal is further used for blind detection of the DCI after receiving the downlink data and completing analysis of the TCI and adjustment of a receiving beam when the first sub-symbol set is finished; meanwhile, in the first sub-symbol set, receiving data through the first wave beam by adopting a second MCS; and in the second sub-symbol set, receiving PDSCH data actively retransmitted by the base station through a second beam by adopting a third MCS.
Optionally, wherein:
assuming that each time slot correspondingly comprises a symbol set, when the GAP time length is an integer number of symbol sets, the first specific time slot is each symbol set corresponding to the GAP time length, and the second specific time slot is a time slot after the last symbol set corresponding to the GAP time length;
the base station is further used for sending independent PDSCH to the terminal through the first wave beam by adopting a second MCS in each time slot corresponding to the GAP time length; and in a time slot after the last symbol set corresponding to the GAP time length, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS.
Optionally, wherein:
the terminal is further used for blind detection of the DCI after receiving the downlink data, and completing analysis of the TCI and adjustment of the receiving beam when a symbol set corresponding to the GAP duration is finished; meanwhile, in a symbol set corresponding to the GAP duration, receiving data through the first wave beam by adopting a second MCS; and in a time slot after the last symbol set corresponding to the GAP time length, receiving PDSCH data actively retransmitted by the base station by a second wave beam by adopting a third MCS.
Compared with the prior art, the method and the system for processing the beam indication in the 5G communication have the following effects:
in the method and system for processing beam indication in 5G communication provided by the present application, in time slot N-1, the base station and the terminal use a higher first MCS (modulation coding level) to perform data transmission through the first beam, and in time slot N, the base station adjusts the transmission beam of downlink PDSCH data to the second beam and notifies the terminal. Particularly, the base station can determine the GAP time length according to the terminal capability and the current parameter set, and according to the GAP time length, the base station adopts a lower second MCS and sends data to the terminal through a first wave beam in a first specific time slot (namely the time slot corresponding to the GAP time length), and correspondingly, the terminal adopts the first wave beam to receive the data, so that the reliability of data transmission is favorably ensured, and the receiving performance of the data can be ensured to the maximum extent under the condition that the terminal does not obtain the wave beam indication; and in a second specific time slot, the base station actively retransmits data to the terminal by a second beam by using a higher third MCS, and correspondingly, the terminal receives the data by using the second beam. When the data decoding in the GAP fails, the terminal utilizes the base station to carry out HARQ combination on the actively retransmitted data so as to enhance the performance of the HARQ combination and improve the decoding performance, thereby being beneficial to reducing the error rate of the data in the time length of the GAP. Compared with the prior art, the method and the device can effectively utilize resources in the GAP time, ensure the resource utilization rate and simultaneously ensure the data receiving performance to the maximum extent under the condition that the terminal does not acquire the beam indication.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart illustrating a method for processing a beam indication in 5G communication according to an embodiment of the present application;
fig. 2 is a diagram illustrating the beam indication process of the base station when the GAP duration is less than 1 slot;
fig. 3 is a diagram illustrating the beam indication process of the base station when the GAP duration is an integer number of symbol sets.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
Terms that may appear in the present application will be explained below.
5G: 5th-Generation, fifth Generation mobile communication technology;
SS Block: synchronization signal block, synchronization block;
RMSI: remaining Minimum System Information, Minimum System Information;
MCS: modulation and coding scheme, Modulation coding level;
PDSCH: a Physical downlink shared channel, a downlink shared channel;
PDCCH: a Physical downlink control channel, a downlink control channel;
DCI: downlink control information, Downlink control information;
TCI: a Transmission Configuration Indicator for transmitting a Configuration indication;
HARQ: hybrid automatic repeat request, Hybrid repeat request;
QCL: quasi-colocation, Quasi co-location;
eMBB: enhanced mobile broadband, enhanced wireless broadband;
URLLC: ultra-reliable low-latency communications, low latency, high reliability communications;
mMTC: massive machine type communications.
In 3GPP R15, a beam management function is added in order to acquire and maintain a beam between a base station and a terminal through the process of L1/L2, and to complete transmission and reception of uplink and downlink data through the corresponding beam, thereby improving link performance. Since the wireless channel between the base station and the terminal is changing in actual communication, the beam management needs to include several basic functional modules: beam determination, beam measurement, beam reporting, beam scanning, and beam indication. Wherein, the beam determination means that the TRP or the UE selects the own receiving and transmitting beam; the beam measurement means that the TRP or the UE measures the characteristics of received beam forming signals; the beam reporting is that the UE reports the beam related information selected by the UE based on the result of the beam measurement; the beam scanning refers to an operation that a TRP or UE transmits and/or receives using a beam to cover a certain spatial area by using a predetermined method at a certain time interval; the beam indication is a network indication which beams the UE can use for data transmission/reception.
In actual communication, since the location of the terminal changes frequently, the base station needs to periodically/non-periodically configure the terminal to perform beam measurement and report. Based on the report result of the terminal, the base station indicates the beam information of the PDSCH data which is currently sent when the downlink sending is carried out, and the terminal adjusts the receiving beam according to the indication of the base station, thereby ensuring the receiving performance of the data. It can be seen that in this process, beam indication of the base station plays an important role, and a specific beam indication method is an important issue discussed by the current standard.
In the communication process, the base station informs the terminal of the relation between the DMRS of the PDCCH and which downlink RSs are QCLs in a mode of RRC signaling or MAC CE, the relation between the downlink PDSCH and which downlink RSs are QCLs is indicated through a TCI field carried in the DCI, and the terminal can be used for adjusting receiving beams of the PDCCH and the PDSCH after acquiring the indication.
However, when the channel of the terminal changes, the base station needs to indicate the beam of the PDSCH by carrying the TCI in the DCI. For the terminal, after receiving downlink data, it needs to decode DCI first and then determine how to update the receive beam, which may cause a GAP phenomenon in receiving PDSCH, that is, the terminal may not update the receive beam accurately before acquiring the TCI indication, thereby causing a decrease in data reception performance during this period.
In view of this, the present application provides a method and a system for processing a beam indication in 5G communication, which can determine a GAP duration, and perform data transmission through a first beam using a second MCS that is lower in a first specific time slot according to the GAP duration, on one hand, resources in the GAP are effectively utilized, and an effective utilization rate of the resources is ensured, and on the other hand, a receiving performance of data can be ensured to the maximum extent under a condition that a terminal does not obtain the beam indication.
The following detailed description is to be read in connection with the drawings and the detailed description.
Fig. 1 is a flowchart illustrating a method for processing beam indication in 5G communication according to an embodiment of the present application, please refer to fig. 1, where the method for processing beam indication in 5G communication according to the present application includes:
102, in a time slot N-1, a base station and a terminal adopt a first MCS to perform data transmission through a first beam, wherein N is a positive integer and is more than or equal to 2;
103, in a time slot N, the base station determines a transmission beam of downlink PDSCH data to be adjusted according to a measurement result reported by the terminal, the adjusted transmission beam is a second beam, and transmits DCI information to the terminal, the terminal is notified through a TCI field in the DCI, and meanwhile, a GAP time length is determined according to the terminal capability and a current parameter set, and the GAP time length is an absolute time from when the terminal receives PDCCH data to when TCI analysis is completed; it should be noted that, the terminal capability mentioned in this application refers to the processing capability of the terminal on data, and includes the number of supported streams, the number of ports, the maximum modulation level, and so on;
104, selecting a first specific time slot and a second specific time slot according to the GAP time length, wherein the first specific time slot is positioned in a time slot range corresponding to the GAP time length, and in the first specific time slot, sending PDSCH data to a terminal by adopting a second MCS through a first beam, and the second MCS is smaller than the first MCS; in a second specific time slot, actively retransmitting PDSCH data to the terminal by a second wave beam by adopting a third MCS, wherein the third MCS is larger than the second MCS;
and 106, when the decoding of the data received by the first wave beam fails, carrying out HARQ combination by using the received PDSCH data actively retransmitted to obtain a decoding result.
In the method for processing the beam indication in the 5G communication, in a time slot N-1, a base station and a terminal adopt a first MCS (modulation and coding level) with higher degree to transmit data through a first beam; when the terminal is displaced relative to the base station and the original first beam is no longer suitable for normal data transmission, the beam needs to be adjusted. In the time slot N, the base station adjusts the transmission beam of the downlink PDSCH data to the second beam, and notifies the terminal. Particularly, the base station can determine the GAP time length according to the terminal capability and the current parameter set, wherein the GAP time length is the absolute time from the time when the terminal receives the PDCCH data to the time when the TCI analysis is completed; according to the GAP time length, in a first specific time slot, the base station adopts a lower second MCS and sends data to the terminal through a first wave beam, correspondingly, the terminal adopts the first wave beam to receive the data, and the first specific time slot is located in a time slot range corresponding to the GAP time length.
In a second specific time slot, the base station actively retransmits data to the terminal by using a higher third MCS through a second beam, and correspondingly, the terminal receives the data by using the second beam, so that the data transmission efficiency is favorably improved. When the data decoding in the GAP fails, the terminal utilizes the base station to carry out HARQ combination on the actively retransmitted data so as to enhance the performance of the HARQ combination and improve the decoding performance, thereby being beneficial to reducing the error rate of the data in the time length of the GAP. Compared with the prior art, the method and the device can effectively utilize resources in the GAP time, ensure the resource utilization rate and simultaneously ensure the data receiving performance to the maximum extent under the condition that the terminal does not acquire the beam indication.
It should be noted that, the second MCS is smaller than the first MCS, which means that the modulation and coding level is lower, and the modulation scheme and the code rate corresponding to the second MCS are lower than the first MCS. Similarly, the third MCS is greater than the second MCS, meaning that the modulation coding level of the third MCS is higher. In addition, in general, when a base station transmits data to a terminal, a PDSCH and a PDCCH are simultaneously transmitted, and the terminal can analyze the PDSCH after receiving the data and analyzing the PDCCH except for the content of the PDCCH.
The above embodiments will be further described by way of specific examples.
(1) The base station quantizes the GAP length according to the terminal capability and the system parameter set. The length of the quantized GAP may be a symbol number or a time slot number, and the length reflects an absolute time between the time when the DCI carries the TCI field and the time when the terminal receives PDCCH data and completes TCI parsing;
(2) when the length of the quantized GAP is not an integer number of time slots, for example, 0.5 time slots, non-time slot level scheduling is adopted, and independent TB is sent in a corresponding downlink GAP data area, and meanwhile, in order to ensure the reliability of data, a lower MCS is adopted and sent through a default beam or a beam before adjustment;
(3) when the length of the quantized GAP is an integer number of time slots, such as 2 time slots, an independent TB is sent in each corresponding time slot, and a lower MCS is sampled and sent through a default beam or a beam before adjustment;
(4) on the basis of (2) and (3), when the terminal finishes the adjustment of the receiving beam, namely in a data area outside the GAP, different RV versions of data in the GAP are sent in an active retransmission mode, and in order to improve the data transmission efficiency, non-adaptive transmission with high MCS level is adopted;
(5) after the terminal analyzes the TCI information, the data is received in the GAP area by adopting the wave beam before adjustment, meanwhile, the data area after the GAP receives active retransmission data by adopting the wave beam after adjustment, and after the data decoding in the GAP fails, the HARQ combination is carried out by utilizing the active retransmission data so as to improve the decoding performance.
Therefore, the method for processing the beam indication in the 5G communication can effectively utilize resources in the GAP, is beneficial to improving the utilization rate of the resources, is also beneficial to improving the reliability of data transmission in the GAP, ensures the communication real-time performance of a user, and can ensure the data receiving performance to the maximum extent under the condition that the terminal does not acquire the beam indication.
Optionally, fig. 2 is a schematic diagram of a beam indication process of a base station when the GAP duration is less than 1 timeslot, please refer to fig. 2, when the GAP duration is less than 1 timeslot, it is assumed that the timeslot N includes a first sub-symbol set and a second sub-symbol set, which are consecutive, and the GAP duration is equal to the first sub-symbol set, at this time, the first specific timeslot is the first sub-symbol set, and the second specific timeslot is the second sub-symbol set;
at this time, in the step 104, according to the GAP duration, selecting a first specific time slot and a second specific time slot, and in the first specific time slot, sending PDSCH data to the terminal through the first beam by using a second MCS, where the second MCS is smaller than the first MCS; in a second specific time slot, actively retransmitting PDSCH data to the terminal through a second beam by using a third MCS, further comprising:
in the first sub-symbol set, sending PDSCH data to the terminal through a first wave beam by adopting a second MCS; in the second sub-symbol set, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS; and simultaneously sending two independent DCIs to the terminal to indicate two scheduled time-frequency positions.
Optionally, in step 105, after receiving the downlink data, the terminal receives the data in the first specific time slot by using the first beam, and receives, in the second specific time slot, the PDSCH data actively retransmitted by the base station by using the third MCS through the second beam, which further includes:
after the terminal receives the downlink data, the DCI is detected in a blind mode, and the TCI is analyzed and the receiving beam is adjusted when the first sub-symbol set is finished; meanwhile, in the first sub-symbol set, adopting a first beam to receive data; and in the second sub-symbol set, receiving PDSCH data actively retransmitted by the base station through a second beam by adopting a third MCS.
In the following, the embodiment is described by using a specific case, assuming that the timeslot N includes a downlink control region, a first sub-symbol set and a second sub-symbol set, and the GAP duration is a timeslot corresponding to the first sub-symbol set, the beam indication processing method is as follows:
1) in a high-frequency range, a base station sends SS Block and RMSI in a beam scanning mode, and after a terminal is accessed, the base station and the terminal establish BPL (Beam Pair Link) according to uplink and downlink measurement results to carry out normal data transmission;
2) referring to fig. 2, in a time slot N, a base station determines, according to a measurement result reported by a terminal, that a transmission beam of a downlink PDSCH needs to be adjusted, and notifies the terminal through a TCI field in DCI, and at the same time, according to a terminal capability and a current parameter set, determines a GAP region as a first sub-symbol set (for example, 7 symbols), so that an initial transmission TB0 is sent through a default beam in a first half of the time slot N (corresponding to the first sub-symbol set), an active retransmission TB0 is sent through an adjusted beam in a second half of the time slot N (corresponding to the second sub-symbol set), and two independent scheduling DCIs sent to the terminal at the same time to indicate two scheduled time-frequency positions;
3) after receiving the downlink data, the terminal blindly detects the DCI, and completes the analysis of the TCI and the adjustment of the receiving beam when the first half time slot (corresponding to the first sub-symbol set) of the time slot N is finished. During the period, the terminal receives primary transmission TB0 data by adopting the beam before adjustment;
4) based on the adjusted receiving beam, the terminal receives TB0 actively retransmitted by the base station in the second half of subframe N (corresponding to the second set of sub-symbols);
5) and if the decoding result of the primary transmission TB0 fails, the terminal utilizes the active retransmission TB0 to perform HARQ combination to obtain a final decoding result.
Optionally, fig. 3 is a schematic diagram of the beam indication processing of the base station when the GAP duration is an integer number of symbol sets, assuming that each timeslot includes a symbol set, when the GAP duration is an integer number of symbol sets, the first specific timeslot is each symbol set corresponding to the GAP duration, and the second specific timeslot is a timeslot after the last symbol set corresponding to the GAP duration;
in the step 104, according to the GAP duration, selecting a first specific time slot and a second specific time slot, and in the first specific time slot, sending PDSCH data to the terminal through the first beam by using a second MCS, where the second MCS is smaller than the first MCS; in a second specific time slot, actively retransmitting PDSCH data to the terminal through a second beam by using a third MCS, further comprising:
in each symbol set corresponding to the GAP duration, adopting a second MCS to respectively send independent PDSCH to the terminal through the first wave beam; and in a time slot after the last symbol set corresponding to the GAP time length, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS.
Optionally, in step 105, after receiving the downlink data, the terminal receives the data in the first specific time slot by using the first beam, and receives, in the second specific time slot, the PDSCH data actively retransmitted by the base station by using the third MCS through the second beam, which further includes:
after the terminal receives the downlink data, the DCI is detected in a blind mode, and the analysis of the TCI and the adjustment of the receiving wave beam are completed when the symbol set corresponding to the GAP time length is finished; meanwhile, in a symbol set corresponding to the GAP duration, receiving data through the first wave beam by adopting a second MCS; and in a time slot after the last symbol set corresponding to the GAP time length, receiving PDSCH data actively retransmitted by the base station by a second wave beam by adopting a third MCS.
The following embodiment is described by specific cases, assuming that the GAP duration is a symbol set, the beam indication processing method is as follows:
1) in a high-frequency range, a base station sends SS Block and RMSI in a beam scanning mode, and after a terminal is accessed, the base station and the terminal establish BPL (Beam Pair Link) according to uplink and downlink measurement results to carry out normal data transmission;
2) in time slot N, the base station determines, according to the measurement result reported by the terminal, that a transmission beam of the downlink PDSCH needs to be adjusted, and notifies the terminal through a TCI field in DCI, and at the same time, determines, according to the terminal capability and the current parameter set, that a GAP region is a symbol set corresponding to one time slot N, so that the PDSCH is transmitted through a default beam in time slot N, and active retransmission data is transmitted through the adjusted beam in time slot N +1, as shown in fig. 3;
3) and after the terminal receives the downlink data, the DCI is detected in a blind mode, and the analysis of the TCI and the adjustment of the receiving beam are completed when the time slot N is finished. During the period, the terminal receives the downlink data of the subframe N by adopting the wave beam before adjustment;
4) based on the adjusted receiving wave beam, the terminal receives active retransmission data in a subframe N + 1;
5) and if the sub-frame N decoding result fails, the terminal performs HARQ merging by using the data of the sub-frame N +1 to obtain a final decoding result.
It should be noted that, when the GAP duration is greater than one time slot and is a non-integer number of time slots, the previous continuous integer number of time slots (corresponding to the first specific time slot) uses the lower second MCS to transmit data to the terminal through the first beam, and the subsequent non-integer number of time slots (corresponding to the second specific time slot) uses the higher third MCS to actively retransmit data to the terminal through the adjusted second beam.
In summary, the method for processing the beam indication in the 5G communication solves the problem of data receiving errors caused by time delay in the beam indication, and the method for processing the beam indication in the 5G communication first determines the GAP duration through the terminal capability and the system parameter set, then reduces the code rate for CBG or TB in at least part of time slots corresponding to the GAP duration, and actively retransmits the data at the next scheduling time, so as to enhance the performance of HARQ combining, thereby being beneficial to reducing the error rate of the data in the GAP duration.
Based on the same inventive concept, the present application further provides a beam indication processing system in 5G communication, including: a base station and a terminal;
the base station is used for sending SS Block and RMSI in a high-frequency time period in a beam scanning mode, and establishing a beam link for data transmission according to uplink and downlink measurement results after the terminal is accessed; in a time slot N-1, a first MCS is adopted to carry out data transmission through a first beam, wherein N is an integer and is more than or equal to 2; in time slot N, the base station determines a transmission beam of downlink PDSCH data to be adjusted according to a measurement result reported by the terminal, the adjusted transmission beam is a second beam, DCI information is transmitted to the terminal, the terminal is informed through a TCI field in the DCI, meanwhile, a GAP time length is determined according to the terminal capability and a current parameter set, and the GAP time length is the absolute time from the time when the terminal receives PDCCH data to the time when TCI analysis is completed; the method also comprises the steps of selecting a first specific time slot and a second specific time slot according to the GAP time length, wherein the first specific time slot is located in a time slot range corresponding to the GAP time length, and sending PDSCH data to the terminal through a first wave beam by adopting a second MCS in the first specific time slot, wherein the second MCS is smaller than the first MCS; in a second specific time slot, actively retransmitting PDSCH data to the terminal by a second wave beam by adopting a third MCS, wherein the third MCS is larger than the second MCS;
the terminal is used for receiving downlink data, adopting a first wave beam to receive PDSCH data in a first specific time slot after receiving the downlink data, and simultaneously adopting a third MCS to receive PDSCH data actively retransmitted by the base station through a second wave beam in a second specific time slot; and when the data received by the first wave beam fails to be decoded, the terminal utilizes the received PDSCH data actively retransmitted to carry out HARQ combination to obtain a decoding result.
In the system for processing the beam indication in the 5G communication, in a time slot N-1, a base station and a terminal adopt a higher first MCS (modulation and coding level) to perform data transmission through a first beam; when the terminal is displaced relative to the base station and the original first beam is no longer suitable for normal data transmission, the beam needs to be adjusted. In the time slot N, the base station adjusts the transmission beam of the downlink PDSCH data to the second beam, and notifies the terminal. Particularly, the base station can determine the GAP time length according to the terminal capability and the current parameter set, wherein the GAP time length is the absolute time from the time when the DCI carries the TCI field, the terminal receives the PDCCH data to the time when the TCI analysis is completed; according to the GAP time length, in a first specific time slot, the base station adopts a lower second MCS and sends data to the terminal through a first wave beam, correspondingly, the terminal adopts the first wave beam to receive the data, and the first specific time slot is located in a time slot range corresponding to the GAP time length.
And in a second specific time slot, the base station actively retransmits data to the terminal by a second beam by adopting a higher third MCS, and correspondingly, the terminal receives the data by adopting the second beam. When the data decoding in the GAP fails, the terminal utilizes the base station to carry out HARQ combination on the actively retransmitted data so as to enhance the performance of the HARQ combination and improve the decoding performance, thereby being beneficial to reducing the error rate of the data in the time length of the GAP. Compared with the prior art, the method and the device can effectively utilize resources in the GAP time, ensure the resource utilization rate and simultaneously ensure the data receiving performance to the maximum extent under the condition that the terminal does not acquire the beam indication.
Optionally, when the GAP duration is less than 1 timeslot, it is assumed that the timeslot N includes a first sub-symbol set and a second sub-symbol set, and the GAP duration is equal to the first sub-symbol set, at this time, the first specific timeslot is the first sub-symbol set, and the second specific timeslot is the second sub-symbol set;
the base station is used for sending PDSCH data to the terminal through the first wave beam by adopting a second MCS in the first sub-symbol set; in the second sub-symbol set, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS; and simultaneously sending two independent DCIs to the terminal to indicate two scheduled time-frequency positions.
Optionally, when the GAP duration is less than 1 timeslot, the terminal is further configured to blindly detect DCI after receiving the downlink data, and complete the analysis of the TCI and the adjustment of the received beam when the first sub-symbol set is ended; meanwhile, in the first sub-symbol set, receiving data through the first beam by adopting a second lower MCS; and in the second sub-symbol set, receiving PDSCH data actively retransmitted by the base station through a second beam by using a third higher MCS.
Optionally, assuming that each timeslot correspondingly includes a symbol set, when the GAP duration is an integer number of symbol sets, the first specific timeslot is each symbol set corresponding to the GAP duration, and the second specific timeslot is a timeslot after the last symbol set corresponding to the GAP duration;
the base station is further configured to send the independent PDSCH to the terminal through the first beam by using the second MCS in each time slot corresponding to the GAP duration; and in a time slot after the last symbol set corresponding to the GAP time length, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS.
Optionally, when the GAP duration is an integer number of time slots, the terminal is further configured to blind-detect the DCI after receiving the downlink data, and complete the analysis of the TCI and the adjustment of the received beam when the symbol set corresponding to the GAP duration is finished; meanwhile, in a symbol set corresponding to the GAP duration, receiving data through the first wave beam by adopting a second MCS with a lower value; and in a time slot after the last symbol set corresponding to the GAP time length, receiving PDSCH data actively retransmitted by the base station through a second wave beam by adopting a higher third MCS.
The foregoing embodiment provides a processing method for indicating a beam between a base station and a terminal when a GAP duration is less than 1 timeslot and the GAP duration is an integer number of symbol sets. It should be noted that, when the GAP duration is greater than one time slot and is a non-integer number of time slots, the previous continuous integer number of time slots (corresponding to the first specific time slot) uses the lower second MCS to transmit data to the terminal through the first beam, and the subsequent non-integer number of time slots (corresponding to the second specific time slot) uses the higher third MCS to actively retransmit data to the terminal through the adjusted second beam.
According to the embodiments, the application has the following beneficial effects:
in the method and system for processing beam indication in 5G communication provided by the present application, in time slot N-1, the base station and the terminal use a higher first MCS (modulation coding level) to perform data transmission through the first beam, and in time slot N, the base station adjusts the transmission beam of downlink PDSCH data to the second beam and notifies the terminal. Particularly, the base station can determine the GAP time length according to the terminal capability and the current parameter set, the base station adopts a lower second MCS and sends data to the terminal through a first wave beam according to the GAP time length in a first specific time slot, and correspondingly, the terminal adopts the first wave beam to receive the data, so that the reliability of data transmission is favorably ensured, and the receiving performance of the data can be ensured to the maximum extent under the condition that the terminal does not obtain the wave beam indication; and in a second specific time slot, the base station actively retransmits data to the terminal through a second beam, and correspondingly, the terminal receives the data by adopting the second beam. When the data decoding in the GAP fails, the terminal utilizes the base station to carry out HARQ combination on the actively retransmitted data so as to enhance the performance of the HARQ combination and improve the decoding performance, thereby being beneficial to reducing the error rate of the data in the time length of the GAP. Compared with the prior art, the method and the device can effectively utilize resources in the GAP time, ensure the resource utilization rate and simultaneously ensure the data receiving performance to the maximum extent under the condition that the terminal does not acquire the beam indication.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A method for processing beam indication in 5G communication is characterized by comprising the following steps:
in a high frequency band, a base station sends SS Block and RMSI in a beam scanning mode; after the terminal is accessed, the base station and the terminal establish a beam link for data transmission according to the uplink and downlink measurement results;
in a time slot N-1, a base station and a terminal adopt a first MCS to carry out data transmission through a first beam, wherein N is a positive integer and is more than or equal to 2;
in a time slot N, the base station determines a transmission beam of downlink PDSCH data needing to be adjusted according to a measurement result reported by the terminal, the adjusted transmission beam is a second beam, DCI information is transmitted to the terminal, the terminal is informed through a TCI field in the DCI, meanwhile, a GAP time length is determined according to the terminal capability and a current parameter set, and the GAP time length is the absolute time from the time when the terminal receives PDCCH data to the time when TCI analysis is completed;
selecting a first specific time slot and a second specific time slot according to the GAP time length, wherein the first specific time slot is located in a time slot range corresponding to the GAP time length, and in the first specific time slot, sending PDSCH data to a terminal through a first wave beam by adopting a second MCS, and the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to a terminal through the second wave beam by adopting a third MCS, wherein the third MCS is larger than the second MCS;
after receiving downlink data, the terminal receives PDSCH data by adopting a first wave beam in the first specific time slot, and simultaneously receives PDSCH data actively retransmitted by the base station by adopting a third MCS through a second wave beam in a second specific time slot;
and when the data received by the first wave beam fails to be decoded, carrying out HARQ combination by using the received PDSCH data actively retransmitted to obtain a decoding result.
2. The method of claim 1, wherein when the GAP duration is less than 1 slot, it is assumed that slot N includes a first set of sub-symbols and a second set of sub-symbols, and the GAP duration is equal to the first set of sub-symbols, when the first specific slot is the first set of sub-symbols and the second specific slot is the second set of sub-symbols;
selecting a first specific time slot and a second specific time slot according to the GAP duration, and sending PDSCH data to a terminal through a first beam by adopting a second MCS in the first specific time slot, wherein the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to the terminal through the second beam by using a third MCS, further:
in the first sub-symbol set, sending PDSCH data to the terminal through a first wave beam by adopting a second MCS; in the second sub-symbol set, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS; and simultaneously sending two independent DCIs to the terminal to indicate two scheduled time-frequency positions.
3. The method as claimed in claim 2, wherein after receiving the downlink data, the terminal receives the data using the first beam in the first specific time slot, and receives the PDSCH data actively retransmitted by the base station using the second beam in the second specific time slot using the third MCS, further comprising:
after the terminal receives the downlink data, the DCI is detected in a blind mode, and the TCI is analyzed and the receiving beam is adjusted when the first sub-symbol set is finished; meanwhile, in the first sub-symbol set, adopting a first beam to receive data; and in the second sub-symbol set, receiving PDSCH data actively retransmitted by the base station through a second beam by adopting a third MCS.
4. The method of claim 1, wherein each timeslot corresponds to a symbol set, and when the GAP duration is an integer number of the symbol sets, the first specific timeslot is each symbol set corresponding to the GAP duration, and the second specific timeslot is a timeslot after a last symbol set corresponding to the GAP duration;
selecting a first specific time slot and a second specific time slot according to the GAP duration, and sending PDSCH data to a terminal through a first beam by adopting a second MCS in the first specific time slot, wherein the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to the terminal through the second beam by using a third MCS, further:
in each symbol set corresponding to the GAP duration, adopting a second MCS to respectively send independent PDSCH to the terminal through the first wave beam; and in a time slot after the last symbol set corresponding to the GAP time length, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS.
5. The method of claim 4, wherein after receiving downlink data, the terminal receives data using the first beam in the first specific time slot, and receives PDSCH data actively retransmitted by the base station using the second beam in the second specific time slot using the third MCS, further comprising:
after the terminal receives the downlink data, the DCI is detected in a blind mode, and the analysis of the TCI and the adjustment of the receiving wave beam are completed when the symbol set corresponding to the GAP time length is finished; meanwhile, in a symbol set corresponding to the GAP duration, receiving data through the first wave beam by adopting a second MCS; and in a time slot after the last symbol set corresponding to the GAP time length, receiving PDSCH data actively retransmitted by the base station by a second wave beam by adopting a third MCS.
6. A beam indication processing system in 5G communication is characterized by comprising: a base station and a terminal;
the base station is used for sending SS Block and RMSI in a high-frequency time period in a beam scanning mode, and establishing a beam link for data transmission according to uplink and downlink measurement results after the terminal is accessed; in a time slot N-1, a first MCS is adopted to carry out data transmission through a first beam, wherein N is an integer and is more than or equal to 2; in a time slot N, the base station determines a transmission beam of downlink PDSCH data needing to be adjusted according to a measurement result reported by the terminal, the adjusted transmission beam is a second beam, DCI information is transmitted to the terminal, the terminal is informed through a TCI field in the DCI, meanwhile, a GAP time length is determined according to the terminal capability and a current parameter set, and the GAP time length is the absolute time from the time when the terminal receives PDCCH data to the time when TCI analysis is completed; the method further comprises the steps of selecting a first specific time slot and a second specific time slot according to the GAP time length, wherein the first specific time slot is located in a time slot range corresponding to the GAP time length, and sending PDSCH data to a terminal through a first beam by adopting a second MCS in the first specific time slot, wherein the second MCS is smaller than the first MCS; in the second specific time slot, actively retransmitting PDSCH data to a terminal through the second wave beam by adopting a third MCS, wherein the third MCS is larger than the second MCS;
the terminal is used for receiving downlink data, and after receiving the downlink data, in the first specific time slot, receiving PDSCH data by adopting a first wave beam, and simultaneously in a second specific time slot, receiving PDSCH data actively retransmitted by the base station by adopting a third MCS through a second wave beam; and when the data received by the first wave beam fails to be decoded, the terminal utilizes the received PDSCH data actively retransmitted to carry out HARQ combination to obtain a decoding result.
7. The system of claim 6, wherein when the GAP duration is less than 1 timeslot, it is assumed that timeslot N includes a first set of sub-symbols and a second set of sub-symbols which are consecutive, and the GAP duration is equal to the first set of sub-symbols, and then the first specific timeslot is the first set of sub-symbols and the second specific timeslot is the second set of sub-symbols;
the base station is used for sending PDSCH data to the terminal through a first wave beam by adopting a second MCS in the first sub-symbol set; in the second sub-symbol set, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS; and simultaneously sending two independent DCIs to the terminal to indicate two scheduled time-frequency positions.
8. The system according to claim 7, wherein the terminal is further configured to perform blind detection on the DCI after receiving the downlink data, and complete TCI parsing and receive beam adjustment at the end of the first sub-symbol set; meanwhile, in the first sub-symbol set, receiving data through the first wave beam by adopting a second MCS; and in the second sub-symbol set, receiving PDSCH data actively retransmitted by the base station through a second beam by adopting a third MCS.
9. The system of claim 6, wherein each timeslot correspondence includes a symbol set, and when the GAP duration is an integer number of symbol sets, the first specific timeslot is each symbol set corresponding to the GAP duration, and the second specific timeslot is a timeslot after the last symbol set corresponding to the GAP duration;
the base station is further used for sending independent PDSCH to the terminal through the first wave beam by adopting a second MCS in each time slot corresponding to the GAP time length; and in a time slot after the last symbol set corresponding to the GAP time length, actively retransmitting PDSCH data to the terminal through a second wave beam by adopting a third MCS.
10. The system according to claim 9, wherein the terminal is further configured to perform blind detection on DCI after receiving the downlink data, and complete TCI analysis and beam adjustment when a symbol set corresponding to a GAP duration ends; meanwhile, in a symbol set corresponding to the GAP duration, receiving data through the first wave beam by adopting a second MCS; and in a time slot after the last symbol set corresponding to the GAP time length, receiving PDSCH data actively retransmitted by the base station by a second wave beam by adopting a third MCS.
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| WO2022047678A1 (en) * | 2020-09-02 | 2022-03-10 | 北京小米移动软件有限公司 | Adjustment indication method and device, and communication link adjustment method and device |
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