CN112235083A - Method and device for feeding back demodulation related information and scheduling terminal - Google Patents

Method and device for feeding back demodulation related information and scheduling terminal Download PDF

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Publication number
CN112235083A
CN112235083A CN201910634910.8A CN201910634910A CN112235083A CN 112235083 A CN112235083 A CN 112235083A CN 201910634910 A CN201910634910 A CN 201910634910A CN 112235083 A CN112235083 A CN 112235083A
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terminal
demodulation failure
terminals
inter
determining
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张闯
钱辰
苏笛
林鹏
喻斌
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Beijing Samsung Telecom R&D Center
Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Priority to CN201910634910.8A priority Critical patent/CN112235083A/en
Priority to PCT/KR2020/005220 priority patent/WO2020214007A1/en
Priority to US17/604,234 priority patent/US20220216976A1/en
Priority to EP20790608.2A priority patent/EP3931989A4/en
Publication of CN112235083A publication Critical patent/CN112235083A/en
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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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present disclosure provides a method and apparatus for a first terminal to transmit demodulation failure related information to a base station in a wireless communication system, and a method and apparatus for a base station to schedule uplink transmission based on the fed-back demodulation failure related information. The method for the first terminal comprises the following steps: receiving and demodulating data from a base station; determining at least one demodulation failure cause respectively associated with at least one second terminal causing inter-terminal interference to the first terminal when demodulating the data fails; generating demodulation failure related information based on the determined at least one demodulation failure reason; and sending the demodulation failure related information to a base station.

Description

Method and device for feeding back demodulation related information and scheduling terminal
Technical Field
The present application relates to the field of wireless communication, and more particularly, to a method and apparatus for feeding back demodulation failure related information and a method and apparatus for scheduling uplink transmission based on the fed back demodulation failure related information.
Background
The rapid growth of mobile data services, especially high definition video and ultra high definition video services, puts higher demands on the transmission rate of wireless communication. To meet the ever-increasing mobile traffic demands, new techniques are needed to further increase the throughput of wireless communication systems. The full-duplex technology can further improve the frequency spectrum utilization rate on the existing system, and the full-duplex system allows the uplink and downlink of the terminal to transmit simultaneously on the same time-frequency resource, which is different from the traditional half-duplex system adopting time domain (time division duplex, TDD) or frequency domain (frequency division duplex, FDD) orthogonal division on the uplink and downlink, so that the full-duplex system can theoretically reach the rate twice of the half-duplex system.
The application of full duplex technology needs to overcome two main problems: firstly, self-interference, namely interference of transmission to reception of the device itself; and secondly, the co-channel interference between terminals in the same cell, namely the interference of an uplink terminal to a downlink terminal using the same time-frequency resource. Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback information employed by hybrid automatic repeat request (HARQ) in current Long Term Evolution (LTE) or new air interface (NR) systems. However, the ACK and NACK cannot inform the base station of the reason for the demodulation failure of the downlink terminal, and it is difficult to help the base station make a better retransmission or scheduling decision.
There is a need to design a new feedback method to help the base station make better retransmission or scheduling decisions.
Disclosure of Invention
Technical problem
The invention designs a feedback method, aiming at helping a base station to make a better decision in the subsequent retransmission or scheduling process and realizing better utilization of system resources by carrying the information of whether demodulation is successful or not and the reason of demodulation failure in the feedback information of data demodulation.
Technical scheme
According to an aspect of the present disclosure, there is provided a method of transmitting demodulation failure related information to a base station by a first terminal in a wireless communication system, the method comprising: receiving and demodulating data from a base station; when demodulating the data fails, determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal; generating demodulation failure related information based on the determined N demodulation failure reasons; and transmitting the demodulation failure related information to a base station, and wherein N is an integer greater than 0.
Wherein the inter-terminal interference is interference caused to the first terminal by the second terminal when performing uplink transmission using the same communication resource as that used when the first terminal performs downlink reception.
Wherein each demodulation failure cause comprises one of a first cause and a second cause.
Wherein the step of determining N demodulation failure reasons associated with the N second terminals respectively comprises: for each of the N second terminals, performing the following steps: determining the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal; determining that a demodulation failure cause associated with a corresponding second terminal is a first cause when the strength of the inter-terminal interference is greater than or equal to a predetermined threshold; and determining that a demodulation failure cause associated with a respective second terminal is a second cause when the strength of the inter-terminal interference is less than a predetermined threshold.
Wherein the step of determining the strength of the inter-terminal interference caused by the corresponding second terminal to the first terminal comprises: and determining the strength of the inter-terminal interference caused by the corresponding second terminal to the first terminal by using the communication resource used by the uplink reference signal of the corresponding second terminal and the downlink reference signal of the first terminal.
Wherein the method further comprises: in case the uplink reference signal of the respective second terminal and the downlink reference signal of the first terminal are time division multiple access or frequency division multiple access, performing the following steps: determining a received power P of a downlink reference signal for a first terminalD(ii) a Communication resources used by downlink reference signals of a first terminalAverage power of PDTo determine the noise mean power Pnoise(ii) a The average power of the communication resource used by the uplink reference signal of the corresponding second terminal is compared with PnoiseThe difference of (a) is determined as the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal.
Wherein the method further comprises: in case the uplink reference signal of the respective second terminal and the downlink reference signal of the first terminal are code division multiple access, performing the steps of: determining a received power P of a downlink reference signal for a first terminalD(ii) a The average power and P of the communication resource used by the downlink reference signal of the first terminal and the communication resource used by the uplink reference signal of the corresponding second terminal are comparedDThe difference of (a) is determined as the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal.
Wherein the step of determining the strength of the inter-terminal interference caused by the corresponding second terminal to the first terminal comprises: and determining the strength of the inter-terminal interference caused by the corresponding second terminal to the first terminal by using the uplink reference signal of the corresponding second terminal.
Wherein the received power P of the uplink reference signal of the corresponding second terminal is determinedUThe strength of inter-terminal interference caused to the first terminal by the corresponding second terminal is determined.
Wherein the step of determining N demodulation failure reasons associated with the N second terminals respectively comprises: determining the SNR of the first terminal and the SINR of the first terminal which is reported last time and determined based on the interference between terminals caused by all the previous second terminals to the first terminalprev(ii) a And for each of the N second terminals, performing the steps of: determining a signal to interference plus noise ratio, SINR, of a first terminal based on inter-terminal interference caused to the first terminal by a corresponding second terminalw(ii) a When the SINR isprev-SNR<First threshold and SNR-SINRw>Determining, at a second threshold, that a demodulation failure cause associated with the corresponding second terminal is a first cause; and when the SINRprev-SNR>First thresholdValue and SNR-SINRw<And a second threshold, determining that the cause of the demodulation failure associated with the corresponding second terminal is a second cause.
The method further comprises the following steps: received power P of downlink reference signal by first terminalDAnd noise mean power PnoiseDetermining the SNR from the ratio of; and wherein, by PDAnd PnoiseAnd the sum of the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal to determine the SINRw(ii) a And wherein P is measured by a previous measurementDWith previously measured PnoiseAnd the sum of the previous intensity of inter-terminal interference caused by all the second terminals to the first terminal respectively to determine the SINRprev。
Wherein the step of generating the demodulation failure related information comprises: generating M-bit indication information as demodulation failure related information for the N second terminals, and wherein M is an integer greater than 0; and when it is determined that the demodulation failure cause associated with at least one of the N second terminals is the first cause, determining the M bits as a first value; and determining the M bits as a second value when it is determined that the demodulation failure causes associated with all of the N second terminals are the second cause.
Wherein the step of generating the demodulation failure related information comprises: performing the following steps for each of the N second terminals: generating M-bit indication information having a first value when it is determined that a demodulation failure cause associated with a corresponding second terminal is a first cause, wherein M is an integer greater than 0; and generating M-bit indication information having a second value when it is determined that the demodulation failure cause associated with the corresponding second terminal is the second cause; and generating demodulation failure related information by one of the following methods: combining the indication information of the M bits having the first value; or combining the M-bit indication information having the first value and the M-bit indication information having the second value.
Wherein the first value is a first predetermined bit sequence; and the second value is a second predetermined bit sequence different from the first predetermined bit sequence.
Wherein the first value indicates a strength of inter-terminal interference caused by the corresponding second terminal to the first terminal; and the second value indicates a strength of inter-terminal interference caused by the corresponding second terminal to the first terminal.
Wherein the step of generating the demodulation failure related information comprises: determining at least one of a scrambling code sequence and a spreading code sequence used when feeding back a Negative Acknowledgement (NACK) based on the N demodulation failure causes; and performing a respective at least one of a scrambling operation and a spreading operation on the NACK using the determined at least one of the scrambling sequence and the spreading code sequence.
Wherein the method further comprises: for each of the N second terminals, indicating a demodulation failure cause with 1 bit, thereby determining a coded sequence containing 1 bit corresponding to each of the N second terminals; and determining at least one of a scrambling code sequence and a spreading code sequence used when the NACK is fed back based on the coding sequence.
According to another aspect of the present disclosure, there is provided a method of processing demodulation failure related information received from a first terminal by a base station in a wireless communication system, the method including: receiving the demodulation failure related information from the first terminal; determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal based on the demodulation failure related information; scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure causes, and wherein N is an integer greater than 0.
Wherein the inter-terminal interference is interference caused to the first terminal when the second terminal performs uplink transmission using the same communication resource as that used when the first terminal performs downlink reception.
Wherein each demodulation failure cause comprises one of a first cause and a second cause.
Wherein the step of determining N demodulation failure reasons associated with the N second terminals respectively comprises: extracting M-bit indication information for the N second terminals from the demodulation failure related information, wherein M is an integer greater than 0; when the M bits of indication information is a first value, determining at least one of the N demodulation failure reasons as a first reason; and when the M bits of indication information is a second value, determining that the N demodulation failure reasons are all second reasons.
Wherein the step of determining N demodulation failure reasons associated with the N second terminals respectively comprises: extracting N M-bit indication information respectively aiming at the N second terminals from the demodulation failure related information, wherein M is an integer larger than 0; and for each of the N second terminals, performing the steps of: when the M-bit indication information for the corresponding second terminal is a first value, determining that a demodulation failure reason associated with the corresponding second terminal is a first reason; and when the M-bit indication information for the corresponding second terminal is a second value, determining that the demodulation failure cause associated with the corresponding second terminal is a second cause.
Wherein the first value is a first predetermined bit sequence; and the second value is a second predetermined bit sequence different from the first predetermined bit sequence.
Wherein the first value indicates a strength of inter-terminal interference caused by the corresponding second terminal to the first terminal and the strength is greater than or equal to a predetermined threshold; and the second value indicates a strength of inter-terminal interference caused by the corresponding second terminal to the first terminal and the strength is less than a predetermined threshold.
Wherein the step of determining N demodulation failure reasons associated with the N second terminals respectively comprises: extracting, from the demodulation failure related information, K M bits of indication information respectively for K second terminals among the N second terminals, where M is an integer greater than 0 and K is an integer greater than 0 and less than N; and performing the following steps for each of the N second terminals: when the extracted M-bit indication information of the K M bits contains M-bit indication information aiming at the corresponding second terminal, determining that the demodulation failure reason associated with the corresponding second terminal is a first reason; and when the extracted M-bit indication information of the K M-bits does not contain the M-bit indication information aiming at the corresponding second terminal, determining that the demodulation failure reason associated with the corresponding second terminal is the second reason.
Wherein the step of determining N demodulation failure reasons associated with the N second terminals respectively comprises: determining at least one of a scrambling code sequence and a spreading code sequence used when the first terminal feeds back the Negative Acknowledgement (NACK) based on the demodulation failure related information; determining N demodulation failure causes associated with the N second terminals, respectively, based on the at least one of the determined scrambling sequence and spreading code sequence.
The method further comprises the following steps: determining a code sequence based on the demodulation failure related information, wherein the code sequence comprises 1 bit for each of the N second terminals, and the 1 bit indicates a demodulation failure reason; and determining N demodulation failure causes associated with the N second terminals, respectively, based on the code sequence.
Wherein scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure reasons comprises: when it is determined that at least one of the N demodulation failure reasons is a first reason, not scheduling uplink transmission of the N second terminals; and when the N demodulation failure reasons are all determined to be second reasons, continuing to schedule uplink transmission of the N second terminals.
Wherein scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure reasons comprises: updating at least one of an inter-terminal interference pairing table and an inter-terminal interference strength table of the base station based on the determined N demodulation failure reasons; scheduling uplink transmissions for the N second terminals based on the updated at least one of the inter-terminal interference pairing table and the inter-terminal interference strength table for the base station.
Wherein the updating of at least one of the inter-terminal interference pairing table and the inter-terminal interference strength table of the base station based on the determined result includes: for each of the N second terminals, performing the following steps: updating at least one of an inter-terminal interference pairing table and an inter-terminal interference strength table of the base station when it is determined that the demodulation failure cause associated with the corresponding second terminal is the first cause; and when it is determined that the demodulation failure cause associated with the corresponding second terminal is the second cause, not updating the inter-terminal interference pairing table and the inter-terminal interference strength table of the base station.
According to still another aspect of the present disclosure, there is provided a first terminal for transmitting demodulation failure related information to a base station in a wireless communication system, the first terminal comprising: a transceiver configured to receive and demodulate data from a base station; and a controller configured to: when demodulating the data fails, determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal; generating demodulation failure related information based on the determined N demodulation failure reasons; and controlling the transceiver to transmit the demodulation failure related information to a base station, and wherein N is an integer greater than 0.
Wherein the inter-terminal interference is interference caused to the first terminal by the second terminal when performing uplink transmission using the same communication resource as that used when the first terminal performs downlink reception.
Wherein each demodulation failure cause comprises one of a first cause and a second cause.
According to still another aspect of the present disclosure, there is provided a base station for processing demodulation failure related information received from a first terminal in a wireless communication system, the base station including: a transceiver configured to receive the demodulation failure related information from the first terminal; and a controller configured to: determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal based on the demodulation failure related information; scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure causes, and wherein N is an integer greater than 0.
Wherein the inter-terminal interference is interference caused to the first terminal when the second terminal performs uplink transmission using the same communication resource as that used when the first terminal performs downlink reception.
Wherein each demodulation failure cause comprises one of a first cause and a second cause.
Technical effects
The invention helps the base station to make better decision in the subsequent retransmission or scheduling by carrying the information indicating the reason of the demodulation failure in the information of the feedback demodulation result, thereby realizing better utilization of communication resources.
Drawings
Fig. 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
Fig. 2 illustrates a resource configuration of one slot of a full-duplex system when an uplink and downlink DMRS is time division multiple access.
Fig. 3 illustrates a resource configuration of one slot of a full-duplex system when an uplink and downlink DMRS is frequency division multiple access.
Fig. 4 illustrates a resource configuration of one slot of a full-duplex system when an uplink and downlink DMRS is code division multiple access.
Fig. 5 illustrates a method 50 of transmitting demodulation failure related information by a first terminal to a base station in a wireless communication system.
Fig. 6 illustrates a method 60 of processing demodulation failure related information received from a first terminal and performing scheduling by a base station in a wireless communication system.
Fig. 7 is a schematic diagram showing the structure of the first terminal 70.
Fig. 8 is a schematic diagram showing the structure of the second terminal 80.
Detailed Description
The application of full duplex technology needs to overcome two main problems: firstly, self-interference, namely interference of transmission to reception of the device itself; and secondly, the co-channel interference between terminals in the same cell, namely the interference of an uplink terminal to a downlink terminal using the same time-frequency resource. For self-interference, some techniques are available to achieve better self-interference cancellation performance, for example, the method in the document "Full duplex radios, d.bharadia, e.mcmilin, s.katti, 2013" can reduce self-interference by 110 dB, and basically reduce self-interference below noise. For the co-channel interference between terminals in a cell, the current main method is to reduce the interference of a terminal performing uplink transmission to a terminal performing downlink reception through scheduling. In order to perform effective terminal scheduling, the base station needs to acquire the strength of interference between terminals. A simple way is to estimate the strength of the inter-terminal interference by obtaining the location information of the terminals, where the strength of the inter-terminal interference between terminals with a long distance is small, and the strength of the inter-terminal interference between terminals with a short distance is large, so that the base station selects a pair of terminals with a long distance to schedule uplink and downlink transmission respectively when scheduling on the same time-frequency resource. The scheduling method based on the terminal location information can reduce the co-channel interference between the terminals to some extent, but if the location information estimation of the terminals is inaccurate (for example, the current positioning accuracy based on the Reference Signal Time Difference (RSTD) is about ten meters, and the accuracy based on the GPS is several meters), the corresponding scheduling performance is greatly influenced. In order to realize more accurate terminal scheduling, the strength of the inter-terminal interference needs to be measured, and the measurement result is reported to the base station, and the base station maintains an inter-terminal interference strength table and performs terminal scheduling based on the table.
Scheduling based on terminal location is less overhead but has the problem of inaccurate scheduling, while scheduling based on inter-terminal interference strength tables can be more accurate but requires more overhead. The method can be used in a practical system by combining two methods, for example, when a terminal just accesses the system or has moved in position and the strength of interference between the terminal and other terminals has not been measured, a base station can perform scheduling based on the terminal position information; and the terminal measures the strength of the interference between the terminals and reports the strength, the base station updates the interference strength table between the terminals and carries out scheduling based on the updated interference strength table between the terminals.
It should be noted that, in the scheduling method based on the terminal location information or the measured strength of the inter-terminal interference, there is a case where the scheduling of the terminal is inaccurate due to inaccurate or outdated information, and in this case, the terminal performing downlink reception may fail to demodulate data due to excessive interference caused by the terminal performing uplink transmission. Therefore, unlike the half-duplex system, a downlink data demodulation failure in the full-duplex system may be caused by excessive interference to a terminal performing downlink reception by a terminal performing uplink transmission, in addition to deterioration in downlink channel quality. If the base station can obtain the reason of the terminal demodulation failure, the scheduling of the uplink transmission can be better decided during retransmission. However, the Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback information adopted by hybrid automatic repeat request (HARQ) in the current Long Term Evolution (LTE) or new air interface (NR) system cannot explain the reason of demodulation failure, so a new feedback method needs to be designed to help the base station make better retransmission or scheduling decision.
Fig. 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
All of the methods described below are applicable to the wireless communication system 10 shown in fig. 1. Fig. 1 comprises a base station 100 and a plurality of terminals 101, 102, 103, 104, 105. Although only 5 terminals are shown, there may be more terminals.
When the system 10 employs full-duplex technology, each terminal experiences both self-interference, i.e., interference of uplink transmission of the terminal itself to downlink reception, and inter-terminal co-channel interference caused to other terminals in the same cell (hereinafter referred to as "inter-terminal interference"), i.e., interference caused to the terminal when the other terminals perform uplink transmission using the same communication resources (e.g., time-frequency resources) as those used when the terminal performs downlink reception.
For example, terminal 101 experiences both self-interference and inter-terminal interference caused to it by terminals 102, 103, 104, 105. Hereinafter, for convenience of description, a terminal that is subject to inter-terminal interference caused by other terminals is referred to as a "first terminal", for example, the terminal 101, and a terminal that causes inter-terminal interference to the first terminal is referred to as a "second terminal", for example, the terminals 102, 103, 104, 105. In the following description herein, it is assumed that there are N second terminals for the first terminal in question, where N is an integer greater than 0.
The present disclosure employs a full-duplex frame structure, as shown in fig. 2-4. Fig. 2 illustrates a resource configuration of one slot of a full-duplex system when an uplink and downlink DMRS is time division multiple access. Fig. 3 illustrates a resource configuration of one slot of a full-duplex system when an uplink and downlink DMRS is frequency division multiple access. Fig. 4 illustrates a resource configuration of one slot of a full-duplex system when an uplink and downlink DMRS is code division multiple access. Fig. 2-4 illustrate cases where time division multiple access, frequency division multiple access, or code division multiple access is employed for the uplink DMRS and the downlink DMRS, respectively.
A typical full-duplex slot is configured to transmit downlink control information on the first few OFDM symbols and demodulation reference signals (DMRSs) on the following few OFDM symbols, the DMRSs including a downlink DMRS for downlink data demodulation and an uplink DMRS for uplink data demodulation. Where full duplex data is transmitted over the last few OFDM symbols. Based on the illustrated frame structure, the base station 80 estimates the uplink channel using the uplink DMRS when demodulating uplink data, and the first terminal 70 estimates the downlink channel using the downlink DMRS when demodulating downlink data.
It should be noted that the method disclosed by the present invention does not depend solely on the frame structure as shown in fig. 2-4.
In addition, it should be noted that the first terminal 70 may also use other known reference signals or uplink and downlink control information instead of the DMRS.
The uplink data received by the base station 80 on the full-duplex symbols may be subject to residual self-interference. The self-interference elimination capability of a general base station is stronger, and the demodulation of uplink data cannot be greatly influenced by residual self-interference. Meanwhile, downlink data received by the first terminal 70 on the full-duplex symbol may be subject to co-channel interference or self-interference of other terminals in the cell, and if the base station is not reasonably scheduled for uplink and downlink transmission of the terminals in the cell or the self-interference cancellation capability of the full-duplex first terminal 70 is reduced, the first terminal 70 may fail to demodulate.
Fig. 5 shows a method 50 of transmitting demodulation failure related information by a first terminal 70 to a base station 80.
In operation 500, the first terminal 70 receives data from the base station 80 and demodulates the data.
In operation 505, when demodulating the data fails, the first terminal 70 determines N demodulation failure causes associated with N second terminals causing inter-terminal interference to the first terminal 70, respectively, where N is an integer greater than 0, and where the inter-terminal interference is interference caused by the second terminals to the first terminal 70 when performing uplink transmission using the same communication resource as that used by the first terminal 70 when performing downlink reception, and where each demodulation failure cause includes one of a first cause and a second cause.
In the following description, the first reason may be that the strength of inter-terminal interference caused to the first terminal 70 by the corresponding second terminal is excessive, and the second reason may be that the downlink quality of the first terminal 70 is poor.
The first terminal 70 may determine N demodulation failure reasons associated with the N second terminals respectively in various manners, and the following description will take the first and second manners as examples.
The first method is as follows:
for each of the N second terminals, performing the following steps:
determining the strength of the inter-terminal interference caused by the corresponding second terminal to the first terminal 70;
determining that a demodulation failure cause associated with a corresponding second terminal is a first cause when the strength of the inter-terminal interference is greater than or equal to a predetermined threshold; and
determining that a demodulation failure cause associated with a corresponding second terminal is a second cause when the strength of the inter-terminal interference is less than a predetermined threshold.
By adopting the first mode, the first terminal 70 can determine the reason for the demodulation failure associated with the second terminal based on a smaller physical quantity, thereby reducing the computational complexity.
The method described below may be employed to determine the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal 70.
When the first terminal 70 does not know the uplink reference signal sequences of the N second terminals and only knows the positions of the communication resources (e.g., time-frequency resources) used by the uplink reference signals of the N second terminals, the strength of the inter-terminal interference caused by the corresponding second terminal to the first terminal 70 may be determined (approximately estimated) by using the communication resources used by the uplink reference signals of the corresponding second terminal and the downlink reference signals of the first terminal 70.
Specifically, first, the first terminal 70 may determine the received power P of the downlink reference signal of the first terminal 70 based on the downlink reference signal of the first terminal 70DWhere subscript D denotes the downlink. Then, if the uplink reference signal of the respective second terminal and the downlink reference signal of the first terminal 70 are time division multiple access (e.g., as shown in fig. 2) or frequency division multiple access (e.g., as shown in fig. 3), the average power of the communication resource used by the first terminal 70 through the reference signal of the first terminal 70 is P and PDTo determine the noise mean power Pnoise. Then P is subtracted from the average power of the Resource Element (RE) in which the downlink reference signal of the first terminal 70 is locatedDThe average power P of the noise can be estimatednoiseThen, the average power P of the noise is subtracted from the average power of the resource unit where the uplink reference signal is locatednoiseAn estimated strength P of inter-terminal interference caused by the second terminal to the first terminal 70 may be obtainedI. If the uplink reference signal of the respective second terminal and the downlink reference signal of the first terminal 70 are code division multiple access (e.g., as shown in fig. 4), then the average power of the resource units in which the uplink reference signal of the first terminal 70 and the downlink reference signal of the respective second terminal are located is subtracted by PDThe difference of (a) is the strength P of the inter-terminal interference caused by the second terminal to the first terminal 70ISum noise mean power PnoiseThe sum of (a) and (b). In the case that the strength of the inter-terminal interference is much larger than the noise power, the difference can be approximated as the second terminal to the first terminalIntensity P of inter-terminal interference caused by terminal 70I。
The strength P of the inter-terminal interference caused by the second terminal to the first terminal 70 is determined by employing the foregoing mannerIThe first terminal 70 does not need to obtain the uplink reference signal sequence of the second terminal from the base station, thereby reducing the signaling overhead of the system.
Alternatively or additionally, another method described below may be employed to determine the strength of the inter-terminal interference caused by the corresponding second terminal to the first terminal 70.
If the first terminal 70 knows the uplink reference signal sequences of the N second terminals, the first terminal 70 may calculate the strength P of inter-terminal interference caused by the respective second terminal to the first terminal 70 based directly on the uplink reference signals of the respective second terminalsI＝RSRPUWherein RSRP denotes the received power of the uplink reference signal, wherein the subscript U denotes the uplink.
The base station 80 may notify the first terminal 70 of the uplink reference signal sequence of the corresponding second terminal, or may bind the uplink reference signal sequence and the downlink reference signal sequence to enable the first terminal 70 to derive the uplink reference signal sequence of the corresponding second terminal from the downlink reference signal sequence of the first terminal 70.
The strength P of the inter-terminal interference caused by the second terminal to the first terminal 70 is determined by employing the foregoing mannerIThe first terminal 70 can more accurately determine the strength P of the inter-terminal interferenceI。
The second method comprises the following steps:
determining the SNR of the first terminal 70 and the SINR of the first terminal 70 that was last reported based on the inter-terminal interference caused to the first terminal 70 by all previous second terminalsprev(ii) a And for each of the N second terminals, performing the steps of: determining the SINR of a first terminal 70 based on inter-terminal interference caused to the first terminal 70 by a corresponding second terminalw(ii) a When SINRprev-SNR<First threshold SINRth1And SNR-SINRw>Second threshold SINRth2Determining that a demodulation failure cause associated with the corresponding second terminal is a first cause; and when the SINRprev-SNR>First threshold SINRth1And SNR-SINRw<Second threshold SINRth2Then, it is determined that the demodulation failure cause associated with the corresponding second terminal is the second cause.
Therein, the first terminal 70 may determine the received power P of the downlink reference signal of the first terminal 70 based on the downlink reference signal of the first terminal 70DWhere subscript D denotes the downlink.
Wherein the first terminal 70 passes the received power P of the downlink reference signal of the first terminal 70DAnd noise mean power PnoiseTo determine the SNR, i.e. the SNR is PD/Pnoise。
Wherein the first terminal 70 passes through PDAnd PnoiseAnd the sum of the strengths of inter-terminal interference caused by the corresponding second terminal to the first terminal 70 to determine the SINRwI.e. SINRw＝PD/(Pnoise+PI)。
Wherein the average power of the communication resource used by the first terminal 70 via the reference signal of the first terminal 70 is related to P, if the uplink reference signal of the respective second terminal and the downlink reference signal of the first terminal 70 are time division multiple access (e.g., as shown in fig. 2) or frequency division multiple access (e.g., as shown in fig. 3)DTo determine the noise mean power Pnoise. Then P is subtracted from the average power of the Resource Element (RE) in which the downlink reference signal of the first terminal 70 is locatedDThe average power P of the noise can be estimatednoiseThen, the average power P of the noise is subtracted from the average power of the resource unit where the uplink reference signal is locatednoiseAn estimated strength P of inter-terminal interference caused by the second terminal to the first terminal 70 may be obtainedIThereby obtaining (P)noise+PI). Alternatively or additionally, the first terminal 70 mayDerived (P) directly based on an average power of communication resources used by uplink reference signals of the respective second terminalsnoise+PI)。
If the uplink reference signal of the respective second terminal and the downlink reference signal of the first terminal 70 are code division multiple access (e.g., as shown in fig. 4), then the average power of the resource units in which the uplink reference signal of the first terminal 70 and the downlink reference signal of the respective second terminal are located is subtracted by PDThe difference of (a) is the strength P of the inter-terminal interference caused by the second terminal to the first terminal 70ISum noise mean power PnoiseIs the sum of (P)noise+PI)。
Wherein, the SINRth1And SINRth2Are all threshold values set by the system.
Wherein, the SINRprevIs the last reported value, which is stored in the first terminal 70 and is the value of P measured previouslyDWith previously measured PnoiseAnd the sum of the previous strengths of inter-terminal interference caused by all the second terminals to the first terminal 70, respectively.
By adopting the second mode, the first terminal 70 can more accurately determine how much the inter-terminal interference and the downlink quality contribute to the demodulation failure, thereby more accurately determining the cause of the demodulation failure.
Referring back to fig. 5, the first terminal 70 generates demodulation failure-related information based on the determined N demodulation failure reasons in operation 510.
The first terminal 70 may generate the demodulation failure related information in various ways, and the following description will take the way a, the way B, and the way C as an example. It should be clear to those skilled in the art that the manner in which the first terminal 70 generates the demodulation failure related information is not limited thereto.
Mode A:
the first terminal 70 generates M bits of indication information as demodulation failure related information for the N second terminals, and wherein M is an integer greater than 0; determining the M bits as a first value when it is determined that a demodulation failure cause associated with at least one of the N second terminals is a first cause; and determining the M bits as a second value when it is determined that the demodulation failure causes associated with all of the N second terminals are the second cause.
Wherein the first value may be a first preset bit sequence; and the second value may be a second preset bit sequence different from the first preset bit sequence.
For example, when M is 1, the first preset bit sequence may be 1, and the second preset bit sequence may be 0. That is, when M is 1, if it is determined that the demodulation failure cause associated with at least one second terminal is that inter-terminal interference is too large, the first terminal 70 feeds back 1-bit or 2-bit NACK (1-bit for feeding back the demodulation results of 1 code block, and 2-bit for feeding back the demodulation results of 2 code block) more than 1-bit, otherwise, if it is determined that the demodulation failure causes associated with all of the N second terminals are the second cause, the first terminal 70 feeds back 0 of 1-bit more than 0 when feeding back NACK.
By adopting the method a, the first terminal 70 can report the reason for the failure of demodulation with less signaling overhead.
Mode B:
the first terminal 70 performs the following steps for each of the N second terminals: generating M-bit indication information having a first value when it is determined that a demodulation failure cause associated with a corresponding second terminal is a first cause, wherein M is an integer greater than 0; and generating M-bit indication information having a second value when it is determined that the demodulation failure cause associated with the corresponding second terminal is the second cause; and generating demodulation failure related information by one of the following methods: combining the indication information of the M bits having the first value; or combining the M-bit indication information having the first value and the M-bit indication information having the second value.
Wherein the first value is a first predetermined bit sequence; and the second value is a second predetermined bit sequence different from the first predetermined bit sequence.
For example, when M is 1, the first preset bit sequence may be 1, and the second preset bit sequence may be 0. That is, when M is 1, if it is determined that the demodulation failure cause associated with one second terminal is that inter-terminal interference is too large, the first terminal 70 feeds back 1-bit more 1 for the second terminal when feeding back NACK, otherwise, if it is determined that the demodulation failure cause associated with the second terminal is the second cause, the first terminal 70 feeds back 1-bit more 0 for the second terminal when feeding back NACK.
Alternatively or additionally, the first value may indicate a strength of inter-terminal interference caused by the respective second terminal to the first terminal 70; and the second value may also indicate the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal 70. In this case, the first terminal 70 may adopt different manners when feeding back the strength of the inter-terminal interference depending on whether the base station 80 has a configuration that allows the first terminal 70 to report Channel State Information (CSI) information multiplexed with ACK/NACK information. If the base station 80 is configured to allow the first terminal 70 to multiplex and report the CSI information and the ACK/NACK information, the first terminal 70 reports the NACK information after multiplexing the NACK information with the measured strength of the interference between the terminal and the terminal; if the base station 80 is not configured to allow the first terminal 70 to report after multiplexing the NACK with the measured strength of the inter-terminal interference when feeding back the NACK, the first terminal 70 reports the measured strength of the inter-terminal interference on the communication resource configured by the base station 80 for reporting the CSI information.
Wherein the reported interference strength information is a quantized level, e.g. the interference strength is measured to 256 levels I0～I255And the terminal reports the corresponding quantization level.
The first terminal 70 combines only the indication information of M bits having the first value in a certain order, or the first terminal 70 combines both the indication information of M bits having the first value and the indication information of M bits having the second value in a certain order, so that the base station 80 can distinguish which second terminal each of the indication information of M bits corresponds to. For example, if the uplink reference signal of the second terminal is time division multiple access (e.g., as shown in fig. 2), the order of the fed back M-bit information is arranged according to the chronological order of the uplink reference signal, that is, the M-bit information corresponding to the uplink reference signal with the previous time is previous; if the uplink reference signal of the second terminal is frequency division multiple access (e.g., as shown in fig. 3), arranging the order of the fed back M-bit information according to the sequence of the uplink reference signal in the frequency domain, that is, the M-bit information corresponding to the uplink reference signal with the previous frequency position is previous; if the uplink reference signal of the second terminal is code division multiple access (e.g., as shown in fig. 4), the order of the fed back pieces of M-bit information is arranged in an order of different codes used by the uplink reference signal, which is previously specified by the base station 80.
By adopting the method B, the first terminal 70 can reflect the contribution of each second terminal to the demodulation failure to the base station 80, thereby facilitating the base station 80 to make different scheduling decisions for each second terminal.
Mode C:
the first terminal 70 determines at least one of a scrambling code sequence and a spreading code sequence used when feeding back a negative acknowledgement NACK based on the N demodulation failure reasons; and performing a respective at least one of a scrambling operation and a spreading operation on the NACK using the determined at least one of the scrambling sequence and the spreading code sequence.
As an example, the first terminal 70 may determine the code sequence by arranging N bits in a certain order, which may be the aforementioned order determined based on the time order/frequency domain order/code order of the uplink reference signals of the second terminals, for each of the N second terminals, with 1 bit indicating the reason for the demodulation failure.
Specifically, if the uplink reference signal of the second terminal is time division multiple access (e.g., as shown in fig. 2), the order of 1 bit for the second terminal may be arranged in the coding sequence in the chronological order of the uplink reference signals, i.e., the 1 bit corresponding to the temporally previous uplink reference signal is previous; if the uplink reference signal of the second terminal is frequency division multiple access (e.g., as shown in fig. 3), the order of 1 bit for the second terminal may be arranged in the coding sequence according to the precedence order of the uplink reference signal in the frequency domain, that is, 1 bit corresponding to the uplink reference signal with the previous frequency position is previous; if the uplink reference signal for the second terminal is code division multiple access (e.g., as shown in fig. 4), the order of the 1-bit information for the second terminal may be arranged in the code sequence in an order of different codes used by the uplink reference signal previously specified by the base station 80.
After determining the coding sequence, the first terminal 70 may determine at least one of a scrambling code sequence and a spreading code sequence used when feeding back the NACK, based on the coding sequence.
As an example, assuming that the first terminal 70 divides the scrambling code sequence/spreading code sequence into a plurality of categories, or numbers the reserved scrambling codes, the first terminal 70 may determine the category of the scrambling code sequence/spreading code sequence used in the feedback, or the number of the reserved scrambling codes, for example, by using the following method: and determining the decimal number corresponding to the N bits as the category of the scrambling code sequence/spread spectrum sequence to be adopted or the number of the reserved scrambling codes.
For example, assuming that there are three second terminals 102, 103, 104, where the demodulation failure cause associated with the second terminal 102 is the poor downlink quality of the first terminal 70, the demodulation failure cause associated with the second terminal 103 is the excessive intensity of inter-terminal interference caused by the second terminal 103 to the first terminal 70, and the demodulation failure cause associated with the second terminal 104 is the excessive intensity of inter-terminal interference caused by the second terminal 104 to the first terminal 70, the code sequence determined by the first terminal 70 according to the demodulation failure cause associated with them is 011. Since the decimal number corresponding to the binary sequence 011 is 3, the first terminal 70 uses the scrambling code sequence/spreading code sequence in category 3 or uses the reserved scrambling code numbered 3 as the primary scrambling code when feeding back NACK.
By adopting the method C, the first terminal 70 can feed back the reason for the failure of demodulation without adding extra bits, thereby reducing signaling overhead.
Referring back to fig. 5, the first terminal 70 transmits the demodulation failure related information to the base station 80 in operation 515.
Fig. 6 shows a method 60 of processing demodulation failure related information received from a first terminal 70 by a base station 80 and performing scheduling.
In operation 600, the base station 80 receives the demodulation failure related information from the first terminal 70.
In operation 605, the base station 80 determines, based on the demodulation failure related information, N demodulation failure causes respectively associated with N second terminals causing inter-terminal interference to the first terminal 70, where N is an integer greater than 0, and where the inter-terminal interference is interference caused to the first terminal 70 when the second terminals perform uplink transmission using the same communication resource as that used when the first terminal 70 performs downlink reception, and where each demodulation failure cause includes one of the first cause and the second cause.
In the following description, the first reason may be that the strength of inter-terminal interference caused to the first terminal 70 by the corresponding second terminal is excessive, and the second reason may be that the downlink quality of the first terminal 70 is poor.
The base station 80 may determine N demodulation failure reasons associated with the N second terminals in various manners, and the following description will take manner 1, manner 2, manner 3, and manner 4 as examples.
Mode 1:
the base station 80 may extract M-bit indication information for the N second terminals from the demodulation failure related information, where M is an integer greater than 0; when the M bits of indication information is a first value, determining at least one of the N demodulation failure reasons as a first reason; and when the M bits of indication information is a second value, determining that the N demodulation failure reasons are all second reasons.
Wherein the first value may be a first preset bit sequence; and the second value may be a second preset bit sequence different from the first preset bit sequence.
For example, the first value may be "1" and the second value may be "0".
For example, when the first terminal 70 generates the demodulation failure related information in the foregoing manner a, the base station 80 may determine N demodulation failure causes in the manner 1. However, the case where the base station 80 adopts the mode 1 is not limited thereto.
By adopting the method 1, the base station 80 can rapidly reduce the inter-terminal interference suffered by the first terminal 70 with less signaling information, and improve the user experience of the user of the first terminal 70.
Mode 2:
the base station 80 may extract, from the demodulation failure related information, N M-bit indication information for the N second terminals, respectively, where M is an integer greater than 0; and for each of the N second terminals, performing the steps of: when the M-bit indication information for the corresponding second terminal is a first value, determining that a demodulation failure reason associated with the corresponding second terminal is a first reason; and when the M-bit indication information for the corresponding second terminal is a second value, determining that the demodulation failure cause associated with the corresponding second terminal is a second cause.
As an example, the first value may be a first preset bit sequence; and the second value may be a second preset bit sequence different from the first preset bit sequence.
For example, the first value may be "1" and the second value may be "0".
Alternatively or additionally, the first value may indicate a strength of inter-terminal interference caused by the respective second terminal to the first terminal 70 and said strength is greater than or equal to a predetermined threshold Pth(ii) a And the second value may indicate a strength of inter-terminal interference caused by the corresponding second terminal to the first terminal 70 and the strength is less than a predetermined threshold Pth。
Specifically, the base station 80 may extract the strength of inter-terminal interference caused by the N second terminals to the first terminal 70 from the demodulation failure related information. When the base station 80 determines the strength of the inter-terminal interference caused by a second terminal to the first terminal 70PIGreater than or equal to a predetermined threshold value PthThe base station 80 then determines that the reason for the demodulation failure associated with the second terminal is the first reason; and when the base station 80 determines the strength P of the inter-terminal interference caused by the second terminal to the first terminal 70ILess than a predetermined threshold PthThe base station 80 then determines that the reason for the demodulation failure associated with the second terminal is the second reason.
For example, when the first terminal 70 generates the demodulation failure related information by combining both the indication information of M bits having the first value and the indication information of M bits having the second value in a certain order as described in the foregoing manner B, the base station 80 may determine the N demodulation failure causes in the manner 2. However, the case where the base station 80 adopts the mode 2 is not limited thereto.
By adopting the method 2, the base station 80 can determine the contribution of each second terminal to the demodulation failure, so as to determine different scheduling decisions for different second terminals, so as to avoid that the second terminals which do not cause inter-terminal interference to the first terminal 70 are limited to uplink transmission to deteriorate the user experience of the second terminals, thereby improving the throughput of the system.
Mode 3:
the base station 80 may extract, from the demodulation failure related information, K M-bit indication information respectively for K second terminals among the N second terminals, where M is an integer greater than 0 and K is an integer greater than 0 and less than N; and performing the following steps for each of the N second terminals: when the extracted M-bit indication information of the K M bits contains M-bit indication information aiming at the corresponding second terminal, determining that the demodulation failure reason associated with the corresponding second terminal is a first reason; and when the extracted M-bit indication information of the K M-bits does not contain the M-bit indication information aiming at the corresponding second terminal, determining that the demodulation failure reason associated with the corresponding second terminal is the second reason.
For example, when the first terminal 70 generates the demodulation failure related information by combining only the indication information of M bits having the first value in a certain order as described in the foregoing manner B, the base station 80 may determine the N demodulation failure causes in the manner 3. However, the case where the base station 80 adopts the mode 3 is not limited thereto.
By adopting the method 3, the base station 80 can know, through relatively less signaling overhead, which specific second terminals cause excessive inter-terminal interference to the first terminal 70.
Mode 4:
the base station 80 may determine at least one of a scrambling code sequence and a spreading code sequence used when the first terminal 70 feeds back the negative acknowledgement NACK, based on the demodulation failure related information; and determining N demodulation failure causes associated with the N second terminals, respectively, based on the at least one of the determined scrambling sequence and spreading code sequence.
For example, when the first terminal 70 generates the demodulation failure related information in the aforementioned manner C, the base station 80 may determine N demodulation failure causes in the manner 4. However, the case where the base station 80 adopts the mode 4 is not limited thereto.
For example, the base station 80 may extract a coded sequence including 1 bit for each of the N second terminals for the reason of the demodulation failure based on the demodulation failure related information, and determine N reasons for the demodulation failure associated with the N second terminals, respectively, based on the coded sequence.
Specifically, the base station 80 determines the coding sequence based on the category of scrambling/spreading code sequence used by the first terminal 70, or the number of reserved scrambling codes used. For example, assuming that there are three second terminals 102, 103, 104, if the base station 80 determines that the first terminal 70 adopts the scrambling code sequence/spreading code sequence in category 3 when feeding back NACK, or adopts the reserved scrambling code numbered 3 as more primary scrambling codes, the base station 80 may convert the category number/number "3" into a binary number "011", thereby determining that 1 bit in the code sequence associated with the second terminal 102 is "0", 1 bit in the code sequence associated with the second terminal 103 is "1", 1 bit in the code sequence associated with the second terminal 102 is "1", where "1" may indicate that the demodulation failure cause associated with the corresponding second terminal is the first cause, and "0" may indicate that the demodulation failure cause associated with the corresponding second terminal is the second cause. Thus, the base station 80 determines the reason for the demodulation failure associated with each second terminal.
The base station 80 performs retransmission scheduling based on the updated terminal pairing situation table, or does not schedule any uplink transmission of the terminal at the time of retransmission.
By adopting the method 4, the base station 80 can know the demodulation failure reason of the first terminal 70 without receiving additional bits, thereby reducing signaling overhead.
Referring back to fig. 6, in operation 610, the base station 80 schedules uplink transmissions for the N second terminals based on the determined N demodulation failure reasons.
The base station 80 maintains an inter-terminal interference pair table (as shown in table 1) and/or an inter-terminal interference strength table (as shown in table 2).
Table 1:
Figure BDA0002129861720000191
TABLE 1 terminal pairing situation table
In table 1, the value at the position (i, j) indicates whether the second terminal i can be paired with the first terminal j, a "0" indicates not, a "1" indicates possible, and a "-" indicates that the pairing relationship has not been determined. The base station 80 performs terminal scheduling based on the terminal pairing situation table, and only terminals that can be paired perform uplink and downlink transmission on the same communication resource (e.g., time-frequency resource) respectively. That is, when (i, j) ═ 0, the second terminal i cannot perform uplink transmission on the communication resource on which the first terminal j performs downlink reception; when (i, j) ═ 1, the second terminal i can perform uplink transmission on the communication resource employed by the first terminal j to perform downlink reception; and when (i, j) —, the base station 80 has not yet determined whether the second terminal i can perform uplink transmission on the communication resource on which the first terminal j performs downlink reception.
Table 2:
Figure BDA0002129861720000201
TABLE 2 interference Strength information sheet between terminals
In table 2, the value at position (i, j) represents a quantized level of the strength of the inter-terminal interference caused by the second terminal i to the first terminal j. For example, as shown in table 2, the strength of inter-terminal interference may be measured to 256 levels I0～I255Other numbers of levels may be quantified. When (i, j) — the base station 80 has not determined the strength of the inter-terminal interference caused by the second terminal i to the first terminal j.
The base station 80 may schedule uplink transmissions for the N second terminals at retransmission based on the determined N demodulation failure reasons. Specifically, the base station 80 may update at least one of the inter-terminal interference pairing table and the inter-terminal interference strength table of the base station 80 based on the determined N demodulation failure causes; and scheduling uplink transmissions for the N second terminals based on the updated at least one of the inter-terminal interference pairing table and the inter-terminal interference strength table for the base station 80.
Specifically, when the base station 80 determines from the demodulation failure related information received by the first terminal j that the demodulation failure cause associated with the second terminal i is the first cause, the base station 80 may update the element (i, j) in the terminal pairing situation table to "0" to indicate that the first terminal j cannot be paired with the second terminal i, or may update the element (i, j) in the inter-terminal interference strength information table to the strength of inter-terminal interference caused by the second terminal i to the second terminal j.
When the base station 80 determines from the demodulation failure related information received by the first terminal j that the demodulation failure cause associated with the second terminal i is the second cause, the base station 80 may update the element (i, j) in the terminal pairing situation table to "1" to indicate that the first terminal j can be paired with the second terminal i, or the base station 80 may not update the terminal pairing situation table. In addition, the base station 80 may update the element (i, j) in the inter-terminal interference strength information table to the strength of the inter-terminal interference caused by the second terminal i to the second terminal j, or may not update the inter-terminal interference strength information table.
After updating the inter-terminal interference pair table and/or the inter-terminal interference strength table, the base station 80 may schedule uplink transmissions for the N second terminals at the time of retransmission based on the updated inter-terminal interference pair table and/or the updated inter-terminal interference strength table.
Specifically, when the base station 80 schedules uplink transmissions of the N second terminals at the time of retransmission based on the updated inter-terminal interference pair table, taking the element (i, j) of the updated inter-terminal interference pair table as an example, when (i, j) is 1, the base station 80 may schedule uplink transmissions of the second terminal i on a communication resource used by the first terminal j for downlink reception, and when (i, j) is 0, the base station 80 may not schedule uplink transmissions of the second terminal i on a communication resource used by the first terminal j for downlink reception. In this way, the base station 80 is able to perform fast and targeted scheduling for each second terminal.
Taking the element (i, j) of the updated inter-terminal interference strength table as an example, when (i, j) < the predetermined threshold P when the base station 80 schedules uplink transmission of the N second terminals at the time of retransmission based on the updated inter-terminal interference strength tablethThe base station 80 may schedule uplink transmissions for the second terminal i on the communication resources used by the first terminal j for downlink reception, and when (i, j) ≧ the predetermined threshold PthThe base station 80 may not schedule uplink transmissions for the second terminal i on the communication resources used by the first terminal j for downlink reception. In this way, the base station 80 can utilize the strength of the inter-terminal interference in time to achieve accurate scheduling.
Alternatively or additionally, the base station 80 may not update any one of the inter-terminal interference pairing table and the inter-terminal interference strength table of the base station 80, and when it is determined that at least one of the N demodulation failure reasons is the first reason, the uplink transmissions of the N second terminals are not scheduled for the next predetermined period of time, and when it is determined that the N demodulation failure reasons are all the second reasons, the uplink transmissions of the N second terminals are continuously scheduled for the next predetermined period of time. In this way, the base station 80 can quickly reduce the inter-terminal interference experienced by the first terminal 70, improving the experience of the user of the first terminal 70.
Fig. 7 is a schematic diagram showing the structure of the first terminal 70.
In fig. 7, the first terminal 70 includes a transceiver 710 and a controller 720. The transceiver 710 is configured to receive and demodulate data from the base station 80. The controller 720 is configured to: when demodulating the data fails, determining N demodulation failure causes associated with N second terminals causing inter-terminal interference to the first terminal 70, respectively; generating demodulation failure related information based on the determined N demodulation failure reasons; and controlling the transceiver to transmit the demodulation failure related information to the base station 80, and wherein N is an integer greater than 0, and wherein the inter-terminal interference is interference caused to the first terminal 70 by the second terminal when performing uplink transmission using the same communication resource as that used when the first terminal 70 performs downlink reception, and wherein each demodulation failure cause includes one of a first cause and a second cause.
The first reason may be that the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal 70 is too large, and the second reason may be that the downlink quality of the first terminal 70 is poor.
Fig. 8 is a schematic diagram showing the structure of the base station 80.
In fig. 8, the base station 80 includes a transceiver 810 and a controller 820.
The transceiver 810 is configured to receive the demodulation failure related information from the first terminal 70. The controller 820 is configured to: determining N demodulation failure causes associated with N second terminals causing inter-terminal interference to the first terminal 70, respectively, based on the demodulation failure-related information; scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure causes, and wherein N is an integer greater than 0, and wherein the inter-terminal interference is interference caused to the first terminal 70 when the second terminal performs uplink transmissions using the same communication resources as used when the first terminal 70 performs downlink reception, and wherein each demodulation failure cause comprises one of a first cause and a second cause.
The first reason may be that the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal 70 is too large, and the second reason may be that the downlink quality of the first terminal 70 is poor.
Various embodiments of the present disclosure may be implemented as computer readable code embodied on a computer readable recording medium from a particular perspective. The computer readable recording medium is any data storage device that can store data readable by a computer system. Examples of the computer readable recording medium may include read-only memory (ROM), random-access memory (RAM), compact disc read-only memory (CD-ROM), magnetic tapes, floppy disks, optical data storage devices, carrier waves (e.g., data transmission via the internet), and the like. The computer-readable recording medium can be distributed over network-connected computer systems and thus the computer-readable code can be stored and executed in a distributed fashion. Also, functional programs, codes, and code segments for implementing various embodiments of the present disclosure may be easily construed by those skilled in the art to which the embodiments of the present disclosure are applied.
It will be understood that embodiments of the present disclosure may be implemented in hardware, software, or a combination of hardware and software. The software may be stored as program instructions or computer readable code executable on a processor on a non-transitory computer readable medium. Examples of the non-transitory computer readable recording medium include magnetic storage media (e.g., ROM, floppy disks, hard disks, etc.) and optical recording media (e.g., CD-ROMs, Digital Video Disks (DVDs), etc.). The non-transitory computer-readable recording medium can also be distributed over network-coupled computer systems so that the computer-readable code is stored and executed in a distributed fashion. The medium may be read by a computer, stored in a memory, and executed by a processor. The various embodiments may be implemented by a computer or a portable terminal including a controller and a memory, and the memory may be an example of a non-transitory computer-readable recording medium adapted to store program(s) having instructions to implement the embodiments of the present disclosure. The present disclosure may be realized by a program having codes for embodying the apparatus and method described in the claims, the program being stored in a machine (or computer) readable storage medium. The program may be electronically carried on any medium, such as a communication signal conveyed via a wired or wireless connection, and the disclosure suitably includes equivalents thereof.

Claims (20)

1. A method for transmitting demodulation failure related information to a base station by a first terminal in a wireless communication system, the method comprising:
receiving and demodulating data from a base station;
when demodulating the data fails, determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal;
generating demodulation failure related information based on the determined N demodulation failure reasons; and
transmitting the demodulation failure related information to a base station, and
wherein N is an integer greater than 0.
2. The method of claim 1, wherein determining N demodulation failure causes associated with the N second terminals, respectively, comprises:
for each of the N second terminals, performing the following steps:
determining the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal;
determining that a demodulation failure cause associated with a corresponding second terminal is a first cause when the strength of the inter-terminal interference is greater than or equal to a predetermined threshold; and
determining that a demodulation failure cause associated with a corresponding second terminal is a second cause when the strength of the inter-terminal interference is less than a predetermined threshold.
3. The method of claim 1, wherein determining N demodulation failure causes associated with the N second terminals, respectively, comprises:
determining the SNR of the first terminal and the SINR of the first terminal which is reported last time and determined based on the interference between terminals caused by all the previous second terminals to the first terminalprev(ii) a And is
For each of the N second terminals, performing the following steps:
determining a signal to interference plus noise ratio, SINR, of a first terminal based on inter-terminal interference caused to the first terminal by a corresponding second terminalw；
When the SINR isprev-SNR<First threshold and SNR-SINRw>Determining, at a second threshold, that a demodulation failure cause associated with the corresponding second terminal is a first cause; and
when the SINR isprev-SNR>First threshold and SNR-SINRw<And a second threshold, determining that the cause of the demodulation failure associated with the corresponding second terminal is a second cause.
4. The method of claim 1, wherein the generating of the demodulation failure-related information comprises:
generating M-bit indication information as demodulation failure related information for the N second terminals, and wherein M is an integer greater than 0; and
determining the M bits as a first value when it is determined that a demodulation failure cause associated with at least one of the N second terminals is a first cause; and
and when the demodulation failure reasons associated with all the N second terminals are determined to be the second reasons, determining the M bits as second values.
5. The method of claim 1, wherein the generating of the demodulation failure-related information comprises:
performing the following steps for each of the N second terminals:
generating M-bit indication information having a first value when it is determined that a demodulation failure cause associated with a corresponding second terminal is a first cause, wherein M is an integer greater than 0; and
generating M-bit indication information having a second value when it is determined that the demodulation failure cause associated with the corresponding second terminal is a second cause; and
generating demodulation failure related information by one of:
combining the indication information of the M bits having the first value; or
Combining the M-bit indication information having the first value and the M-bit indication information having the second value.
6. The method according to one of claims 4 to 5,
the first value is a first predetermined bit sequence; and is
The second value is a second predetermined bit sequence different from the first predetermined bit sequence.
7. The method of claim 5, wherein,
the first value indicates the strength of inter-terminal interference caused by the corresponding second terminal to the first terminal; and is
The second value indicates a strength of inter-terminal interference caused by the corresponding second terminal to the first terminal.
8. The method of claim 1, wherein the generating of the demodulation failure-related information comprises:
determining at least one of a scrambling code sequence and a spreading code sequence used when feeding back a Negative Acknowledgement (NACK) based on the N demodulation failure causes; and
performing a respective at least one of a scrambling operation and a spreading operation on the NACK using the determined at least one of a scrambling sequence and a spreading code sequence.
9. A method of processing demodulation failure related information received from a first terminal by a base station in a wireless communication system, the method comprising:
receiving the demodulation failure related information from the first terminal;
determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal based on the demodulation failure related information;
scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure reasons, and
wherein N is an integer greater than 0.
10. The method of claim 9, wherein determining N demodulation failure causes associated with the N second terminals, respectively, comprises:
extracting M-bit indication information for the N second terminals from the demodulation failure related information, wherein M is an integer greater than 0; and
when the M bits of indication information is a first value, determining at least one of the N demodulation failure reasons as a first reason; and
and when the M bits of indication information is a second value, determining that the N demodulation failure reasons are all second reasons.
11. The method of claim 9, wherein determining N demodulation failure causes associated with the N second terminals, respectively, comprises:
extracting N M-bit indication information respectively aiming at the N second terminals from the demodulation failure related information, wherein M is an integer larger than 0; and
for each of the N second terminals, performing the following steps:
when the M-bit indication information for the corresponding second terminal is a first value, determining that a demodulation failure reason associated with the corresponding second terminal is a first reason; and
and when the M bits of indication information for the corresponding second terminal are a second value, determining that the demodulation failure reason associated with the corresponding second terminal is a second reason.
12. The method according to one of claims 10 to 11,
the first value is a first predetermined bit sequence; and is
The second value is a second predetermined bit sequence different from the first predetermined bit sequence.
13. The method of claim 11, wherein,
the first value indicates a strength of inter-terminal interference caused by the respective second terminal to the first terminal and the strength is greater than or equal to a predetermined threshold; and is
The second value indicates a strength of inter-terminal interference caused by the corresponding second terminal to the first terminal and the strength is less than a predetermined threshold.
14. The method of claim 9, wherein determining N demodulation failure causes associated with the N second terminals, respectively, comprises:
extracting, from the demodulation failure related information, K M bits of indication information respectively for K second terminals among the N second terminals, where M is an integer greater than 0 and K is an integer greater than 0 and less than N; and
performing the following steps for each of the N second terminals:
when the extracted M-bit indication information of the K M bits contains M-bit indication information aiming at the corresponding second terminal, determining that the demodulation failure reason associated with the corresponding second terminal is a first reason; and
and when the extracted M-bit indication information of the K M bits does not contain the M-bit indication information aiming at the corresponding second terminal, determining that the demodulation failure reason associated with the corresponding second terminal is the second reason.
15. The method of claim 9, wherein determining N demodulation failure causes associated with the N second terminals, respectively, comprises:
determining at least one of a scrambling code sequence and a spreading code sequence used when the first terminal feeds back the Negative Acknowledgement (NACK) based on the demodulation failure related information;
determining N demodulation failure causes associated with the N second terminals, respectively, based on the at least one of the determined scrambling sequence and spreading code sequence.
16. The method of claim 9, wherein scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure causes comprises:
when it is determined that at least one of the N demodulation failure reasons is a first reason, not scheduling uplink transmission of the N second terminals; and
and when the N demodulation failure reasons are all determined to be second reasons, continuing to schedule uplink transmission of the N second terminals.
17. The method of claim 9, wherein scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure causes comprises:
updating at least one of an inter-terminal interference pairing table and an inter-terminal interference strength table of the base station based on the determined N demodulation failure reasons;
scheduling uplink transmissions for the N second terminals based on the updated at least one of the inter-terminal interference pairing table and the inter-terminal interference strength table for the base station.
18. The method of claim 17, wherein updating at least one of an inter-terminal interference pair table and an inter-terminal interference strength table of a base station based on the determined result comprises:
for each of the N second terminals, performing the following steps:
updating at least one of an inter-terminal interference pairing table and an inter-terminal interference strength table of the base station when it is determined that the demodulation failure cause associated with the corresponding second terminal is the first cause; and
when it is determined that the demodulation failure cause associated with the corresponding second terminal is the second cause, the inter-terminal interference pairing table and the inter-terminal interference strength table of the base station are not updated.
19. A first terminal for transmitting demodulation failure related information to a base station in a wireless communication system, the first terminal comprising:
a transceiver configured to receive and demodulate data from a base station; and
a controller configured to:
when demodulating the data fails, determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal;
generating demodulation failure related information based on the determined N demodulation failure reasons; and
controlling the transceiver to transmit the demodulation failure related information to a base station, and
wherein N is an integer greater than 0.
20. A base station for processing demodulation failure related information received from a first terminal in a wireless communication system, the base station comprising:
a transceiver configured to receive the demodulation failure related information from the first terminal; and
a controller configured to:
determining N demodulation failure reasons respectively associated with N second terminals causing inter-terminal interference to the first terminal based on the demodulation failure related information;
scheduling uplink transmissions for the N second terminals based on the determined N demodulation failure reasons, and
wherein N is an integer greater than 0.
CN201910634910.8A 2019-04-18 2019-07-15 Method and device for feeding back demodulation related information and scheduling terminal Pending CN112235083A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201910634910.8A CN112235083A (en) 2019-07-15 2019-07-15 Method and device for feeding back demodulation related information and scheduling terminal
PCT/KR2020/005220 WO2020214007A1 (en) 2019-04-18 2020-04-20 Method and apparatus for measuring interference, feeding back demodulation related information and scheduling terminals, channel switching, and interference processing
US17/604,234 US20220216976A1 (en) 2019-04-18 2020-04-20 Method and apparatus for measuring interference, feeding back demodulation related information and scheduling terminals, channel switching, and interference processing
EP20790608.2A EP3931989A4 (en) 2019-04-18 2020-04-20 Method and apparatus for measuring interference, feeding back demodulation related information and scheduling terminals, channel switching, and interference processing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910634910.8A CN112235083A (en) 2019-07-15 2019-07-15 Method and device for feeding back demodulation related information and scheduling terminal

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