WO2017201835A1

WO2017201835A1 - Transmission method for enhanced physical downlink control channel, network apparatus, and terminal apparatus

Info

Publication number: WO2017201835A1
Application number: PCT/CN2016/089917
Authority: WO
Inventors: 孟杰
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-05-25
Filing date: 2016-07-13
Publication date: 2017-11-30
Also published as: CN107437981A; CN107437981B

Abstract

The present invention relates to the technical field of communications, and discloses a transmission method for an enhanced physical downlink control channel (EPDCCH), network apparatus, and terminal apparatus. The method comprises: sending initial EPDCCH configuration information; receiving narrow band CQI information reported by a terminal apparatus in real-time; determining, according to the CQI information, whether a channel environment of the terminal apparatus reaches a predetermined threshold; if the channel environment reaches the threshold, and an initial transmission mode is a distributed mode, then changing, according to a dynamic EPDCCH mechanism, the EPDCCH transmission mode to be a localized mode; and if the channel environment does not reach the threshold, and the initial transmission mode is the localized mode, then changing, according to the dynamic EPDCCH mechanism, the EPDCCH transmission mode to be the distributed mode. In this way, the present invention enables dynamic adjustment of the mode of EPDCCH transmission according to a real-time channel state.

Description

Transmission method of enhanced physical downlink control channel, network side device and terminal device

Technical field

The present application relates to, but is not limited to, the field of communication technologies, in particular, a transmission method of an enhanced physical downlink control channel, a network side device, and a terminal device.

Background technique

In the LTE-A (Long-Term Evolution-Advanced) system, the 3GPP (3rd Generation Partnership Project) Release 11 introduces an EPDCCH (Enhanced Physical Downlink Control Channel). the concept of. The EPDCCH is mainly used to increase the capacity of the control channel; the cross-carrier scheduling characteristic that is beneficial to carrier aggregation; the scheduling of the control information in the frequency domain and the ICIC (Inter-Cell Interference Coordination) processing. The EPDCCH uses the PDSCH (Physical Downlink Shared Channel) resource to transmit DCI (Downlink Control Information), which usually occupies only a small portion of the entire downlink system bandwidth. The EPDCCH is configured by the eNB (Evolved Node B, Evolved Node B) to the UE (User Equipment) through the EPDCCH-SetConfig-r11 command. The transmissionType-r11 command configures whether the EPDCCH transmission mode is localized or distributed. The EPDCCH transmits the transmission resource of the data service on the PDSCH channel. The EPDCCH transmission mode fixedly configured by the eNB does not take into account the channel state actually reported by the UE. The 3GPP does not provide a particularly flexible adaptive handover scheme, so that the network and the UE cannot flexibly select an appropriate EPDCCH transmission mode and reception mode in different scenarios.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

In view of this, the purpose of the application is to provide an enhanced physical downlink control channel EPDCCH. The transmission method, the network side device, and the terminal device are used to solve the problem that the EPDCCH transmission mode cannot be flexibly selected.

To achieve the above objective, the present application provides an EPDCCH transmission method, the method includes the steps of: transmitting initial EPDCCH configuration information, where the initial EPDCCH configuration information includes an initial EPDCCH transmission mode, where the initial transmission mode includes centralized Or distributed; receiving the narrowband channel quality indication CQI information reported by the terminal device in real time; determining, according to the CQI information, whether the channel environment of the terminal device reaches a preset threshold; when the channel environment reaches a threshold, and the initial transmission When the mode is distributed, the EPDCCH transmission mode is changed to a centralized mode according to the dynamic EPDCCH mechanism; and when the channel environment does not reach the threshold, and the initial transmission mode is centralized, the EPDCCH transmission mode is adopted according to the dynamic EPDCCH mechanism. Change to distributed.

Optionally, before the step of sending the initial EPDCCH configuration information, the method further includes: checking whether the terminal device that needs to perform cross-carrier scheduling supports the dynamic EPDCCH mechanism.

Optionally, the step of changing the EPDCCH transmission mode to the centralized mode according to the dynamic EPDCCH mechanism includes: notifying the terminal device to transmit by using a dynamic EPDCCH mechanism; and determining a channel quality according to the narrowband position reported by the terminal device. a frequency domain location; and transmitting to the terminal device in a centralized manner by the one frequency domain location.

Optionally, the step of changing the EPDCCH transmission mode to the distributed according to the dynamic EPDCCH mechanism includes: notifying the terminal device to transmit by using a dynamic EPDCCH mechanism; and determining, according to the narrowband position reported by the terminal device, multiple channel qualities. a preferred frequency domain location; and transmitting to the terminal device by the plurality of frequency domain locations.

Optionally, the method further includes: when the channel environment reaches a threshold, and the initial transmission mode is centralized, or when the channel environment does not reach a threshold, and the initial transmission mode is distributed, continue to adopt The initial EPDCCH transmission mode is transmitted.

To achieve the above object, the present application provides another method for transmitting by using an EPDCCH, where the method includes the steps of: receiving EPDCCH configuration information sent by a network side device in an initially configured transmission manner, where the initial transmission mode includes centralized or distributed Transmitting the narrowband channel quality indication CQI information to the network side device in real time; receiving the transmission sent by the network side device using the dynamic EPDCCH mechanism And receiving the information sent by the network side device by using a dynamic EPDCCH mechanism according to the received notification message.

Optionally, before the step of receiving the EPDCCH configuration information sent by the network side device in the initially configured transmission mode, the method further includes: reporting, to the network side device, EPDCCH capability information of the terminal device, where the EPDCCH is The capability information includes whether the terminal device supports a dynamic EPDCCH mechanism.

The application further provides a computer readable storage medium storing computer executable instructions that are implemented when the computer executable instructions are executed.

In order to achieve the above object, the present application further provides a network side device, where the network side device includes: a configuration unit, configured to send an initial enhanced physical downlink control channel EPDCCH configuration information, where the initial EPDCCH configuration information includes an initial The transmission mode of the EPDCCH, the initial transmission mode includes centralized or distributed; the receiving unit is configured to receive the narrowband channel quality indication CQI information reported by the terminal device in real time; and the determining unit is configured to determine the terminal according to the CQI information Whether the channel environment of the device reaches a preset threshold and whether the initial transmission mode is distributed or centralized; and the determining unit is configured to: when the channel environment reaches a threshold, and the initial transmission mode is distributed, according to the dynamic The EPDCCH mechanism determines to change the transmission mode of the EPDCCH to a centralized mode; when the channel environment does not reach the threshold, and the initial transmission mode is centralized, determining, according to the dynamic EPDCCH mechanism, changing the transmission mode of the EPDCCH to distributed; a unit, configured to adopt a changed E determined according to a dynamic EPDCCH mechanism The transmission mode of the PDCCH transmits information to the terminal device.

Optionally, the network side device further includes: an checking unit, configured to check whether the terminal device that needs to perform cross-carrier scheduling supports before the initial enhanced physical downlink control channel EPDCCH configuration information is sent by the configuration unit The dynamic EPDCCH mechanism.

Optionally, the determining unit is configured to: when the channel environment reaches a threshold, and the initial transmission mode is distributed, notify the terminal device to send by using a dynamic EPDCCH mechanism, and report the packet according to the terminal device. The narrowband position determines a frequency domain location with a better channel quality; the transmitting unit is configured to transmit to the terminal device through the one frequency domain location.

Optionally, the determining unit is configured to when the channel environment does not reach a threshold, and the initial When the initial transmission mode is centralized, the terminal device is notified to transmit by using a dynamic EPDCCH mechanism, and multiple frequency domain locations with relatively good channel quality are determined according to the narrowband position reported by the terminal device; the sending unit is configured. And transmitting to the terminal device through the plurality of frequency domain locations.

Optionally, the determining unit is further configured to: when the channel environment reaches a threshold, and the initial transmission mode is centralized, or when the channel environment does not reach a threshold, and the initial transmission mode is distributed, The transmission is continued using the original EPDCCH transmission mode.

In order to achieve the above object, the present application further provides a terminal device, where the terminal device includes: a first receiving unit, configured to receive, according to an initially configured transmission manner, enhanced physical downlink control channel EPDCCH configuration information sent by a network side device, where The initial transmission mode includes centralized or distributed, and the reporting unit is configured to report the narrowband channel quality indication CQI information to the network side device in real time; and the second receiving unit is configured to receive the notification sent by the network side device by using the dynamic EPDCCH mechanism. The message is received by the network side device according to the received notification message by using a dynamic EPDCCH mechanism.

Optionally, the reporting unit is further configured to report the EPDCCH capability information of the terminal device to the network side device before the first receiving unit receives the EPDCCH configuration information sent by the network side device in an initially configured transmission manner. The EPDCCH capability information includes whether the terminal device supports a dynamic EPDCCH mechanism.

The present application proposes an EPDCCH transmission method, a network side device, and a terminal device. The EPDCCH transmission method includes: determining whether to change the transmission mode of the EPDCCH according to the CQI information reported by the terminal device and the initially configured transmission mode, and according to the narrowband position reported by the terminal device. The frequency domain location with better channel quality is determined for transmission, so that the transmission mode of the EPDCCH is dynamically adjusted according to the real-time channel state. In this way, the channel environment can be transmitted in a centralized manner, which facilitates the frequency domain scheduling gain and the terminal device to demodulate the received information, and distributes the transmission when the channel environment is poor, thereby improving the EPDCCH transmission rate, thereby obtaining a practical and simple self. Adapt to the EPDCCH scheme.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

FIG. 1 is a transmission side of an enhanced physical downlink control channel according to a first embodiment of the present application; Flow chart of the law;

2 is a flowchart of a method for transmitting an enhanced physical downlink control channel according to a second embodiment of the present application;

3 is a functional block diagram of a network side device according to a third embodiment of the present application;

FIG. 4 is a functional block diagram of a terminal device according to a fourth embodiment of the present application.

The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings.

Preferred embodiment of the invention

The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.

As shown in FIG. 1 , the first embodiment of the present application provides a method for transmitting an EPDCCH, which is applied to a network side device in an LTE-A communication system, where the LTE-A communication system further includes a terminal device. The network side device may be an eNB. The terminal device may be a mobile phone, a smart phone, a notebook computer, a computer, or the like. The method includes the following steps:

S100: Check whether a terminal device that needs to perform cross-carrier scheduling supports a D-EPDCCH (Dynamic-EPDCCH) mechanism. The D-EPDCCH mechanism is applied to dynamically adjust an EPDCCH transmission mode according to a current channel environment of the terminal device.

In step S100, when the terminal device needs cross-carrier scheduling, the network-side device needs to send an instruction for querying the EPDCCH capability information of the terminal device to the terminal device. The network side device queries the terminal device for EPDCCH capability information of the terminal device, for example, by sending a UE Capability Inquiry command to the terminal device. In this embodiment, the EPDCCH capability information mainly includes whether the terminal device supports the D-EPDCCH mechanism. The terminal device reports its EPDCCH capability information to the network side device, for example, the EPDCCH capability information is included in the UE Information message for reporting. A flag is set in the message. If the flag is true, the terminal device supports the D-EPDCCH mechanism. If the flag bit is false, the terminal device does not support the D-EPDCCH mechanism.

In other embodiments, when the terminal device does not need to perform cross-carrier scheduling or does not support D-EPDCCH In the mechanism, the network side device sends an instruction for querying EPDCCH information by using a scheme of the 3GPP related technology.

S102: When the terminal device supports the D-EPDCCH mechanism, the initial EPDCCH configuration information is sent.

In step S102, the network side device delivers initial EPDCCH configuration information by using an RRC Connection Reconfiguration message. The initial EPDCCH configuration information includes, but is not limited to, an initial EPDCCH transmission mode. The initial transmission method can be centralized or distributed. An EPDCCH is transmitted using one or more consecutive ECCEs (Enhanced Control Channel Elements), and the ECCE is the smallest information resource unit when the EPDCCH carries DCI. An ECCE consists of multiple EREGs (Enhanced Resource Element Groups). When the centralized EPDCCH transmission mode is adopted, all EREGs included in one ECCE are located in the same PRB (Physical Resource Block) pair. When the distributed EPDCCH transmission mode is adopted, the EREGs included in one ECCE are distributed on different PRB pairs.

S104: Receive a narrowband CQI (Channe l-quality indicator) information that is reported by the terminal device in real time.

The CQI information includes, but is not limited to, a CQI index value, a modulation, a coding rate, an efficiency, and the like. Each CQI index value corresponds to a different modulation value, coding rate, and efficiency.

S106. Determine, according to the CQI information, whether a channel environment of the terminal device reaches (greater than or equal to) a preset threshold.

In step S106, according to the definition of each CQI index value and the meaning of its representation in the 3GPP-LTETS 36.213 protocol, when the CQI index value reaches 10 or more, the modulation mode may be 64QAM (Quadrature Amplitude Modulation). ), the channel environment is good at this time, and the D-EPDCCH mechanism can be started. Therefore, in the present embodiment, the threshold is set to 10. The network side device compares the CQI index value reported by the terminal device with the threshold. If the CQI index value reaches the threshold, step S108 is performed. If the CQI index value does not reach the threshold, step S118 is performed.

S108. Determine whether the initial transmission mode is distributed. If it is distributed, steps S110-S114 are performed. If it is not distributed, step S116 is performed.

In step S108, the network side device may query the initial transmission mode according to the initial EPDCCH configuration information. In this embodiment, when the CQI index value reaches the threshold, that is, the current channel environment is good, the D-EPDCCH mechanism does not need to continue to use distributed transmission, but the EPDCCH information should be concentrated on the channel quality. The frequency domain location is transmitted for the terminal device to receive and demodulate.

S110. The terminal device is notified to transmit by using a D-EPDCCH mechanism.

In this embodiment, the network side device and the terminal device are in agreement, and the terminal device may be notified by DCI format1A to use the D-EPDCCH mechanism to perform EPDCCH transmission. The flag of the EPDCCH is sent in the DCI format1A. If the flag is true, the EPDCCH information to be received by the terminal device will be transmitted by using the D-EPDCCH mechanism. If the flag is false, the EPDCCH information to be received by the terminal device is indicated. It will continue to be sent using the initial transmission method. The terminal device detects the received DCI format1A, and can know whether the network side device is to use the D-EPDCCH mechanism to perform EPDCCH transmission, so as to prepare for receiving.

S112. Determine a frequency domain location with a better channel quality according to the narrowband position reported by the terminal device.

In the step S112, the narrowband position may be reported in the CQI information reported by the network side device, or the network side device may report the report to the terminal device at this time, and then the terminal device performs the report again. The network side device determines the frequency domain location with the better EPDCCH channel quality according to the narrowband position reported by the terminal device, and sends the EPDCCH information to the PRB pair in the frequency domain with better channel quality.

S114: Perform EPDCCH transmission to the terminal device by using the determined frequency domain location.

In step S114, after determining the frequency domain location with better channel quality, the network side device concentrates the EPDCCH information on the frequency domain PRB pair with better channel quality and sends the signal to the terminal device. Such a transmission mode is advantageous for the frequency domain scheduling gain and the demodulation of the EPDCCH information by the terminal device.

S116. Determine to continue to use the initial transmission mode for EPDCCH transmission.

In the step S116, when the CQI index value reaches the threshold, that is, when the current channel environment is good, if the initial transmission mode is already centralized, the D-EPDCCH mechanism does not need to change the transmission mode of the EPDCCH, and may continue to be used. The initial transmission mode performs EPDCCH transmission to the terminal device.

S118. Determine whether the initial transmission mode is centralized. If it is centralized, perform the steps S120-S124. If it is not centralized, step S126 is performed.

In step S118, when the CQI index value does not reach the threshold, that is, the current channel environment is poor, the D-EPDCCH mechanism should not continue to adopt centralized transmission, but the EPDCCH information should be dispersed in a relatively good channel quality. The frequency domain location is sent to increase the transmission rate.

S120. Instruct the terminal device to perform EPDCCH transmission by using a D-EPDCCH mechanism.

In step S120, the network side device notifies the terminal device to transmit by using the D-EPDCCH mechanism through the DCI format 1A. The terminal device knows that the network side device will use the D-EPDCCH mechanism to transmit through the received DCI format1A, so as to prepare for receiving.

S122. Determine, according to the narrowband position reported by the terminal device, a frequency domain location with a relatively good channel quality.

In step S122, the narrowband location may be reported in the CQI information reported by the network side device, or the network side device may report the report to the terminal device at this time, and then the terminal device performs the report again. The network side device determines a frequency domain location with a relatively good EPDCCH channel quality according to the narrowband position reported by the terminal device, and distributes the EPDCCH information on the frequency domain PRB pair with relatively good channel quality.

S124: Distribute to the terminal device by using the determined multiple frequency domain locations.

In step S124, after determining, by the network side device, a plurality of frequency domain locations with relatively good channel quality, the network side device distributes the information on the PRB pair in the frequency domain with relatively good channel quality to the terminal device. Such a transmission mode is advantageous for increasing the transmission rate of the EPDCCH.

S126. Determine to continue to use the initial transmission mode for sending.

In step S126, when the CQI index value does not reach the threshold, that is, the current channel environment is poor, if the initial transmission mode is already distributed, according to the D-EPDCCH mechanism, the EPDCCH transmission mode does not need to be changed, and the PDCCH may continue. The initial transmission mode is used to transmit to the terminal device.

As shown in FIG. 2, the second embodiment of the present application provides a method for transmitting an enhanced physical downlink control channel (EPDCCH), which is applied to a terminal device in an LTE-A communication system, where the LTE-A communication system further includes a network side device. The network side device may be an eNB. The terminal device may be a mobile phone, a smart phone, a notebook computer, a computer, or the like. The method includes the following steps:

S200: The terminal device in the connected state reports the EPDCCH capability information to the network side device.

In this embodiment, the EPDCCH capability information mainly includes whether the terminal device supports the D-EPDCCH mechanism. The D-EPDCCH mechanism refers to dynamically adjusting the transmission mode of the EPDCCH according to the current channel environment of the terminal device.

When the terminal device needs to perform cross-carrier scheduling, the network-side device needs to send an instruction for querying the EPDCCH capability information of the terminal device to the terminal device. The network side device queries the terminal device for EPDCCH capability information of the terminal device, for example, by sending a UE Capability Inquiry command to the terminal device. The terminal device reports its EPDCCH capability information to the network side device, for example, the EPDCCH capability information is included in the UE Information message for reporting. A flag is set in the message. If the flag is true, the terminal device supports the D-EPDCCH mechanism. If the flag bit is false, the terminal device does not support the D-EPDCCH mechanism.

S202. Receive EPDCCH configuration information sent by the network side device in an initially configured transmission manner.

In step S202, the network side device delivers initial EPDCCH configuration information by using an RRC Connection Reconfiguration message. The initial EPDCCH configuration information includes, but is not limited to, an initial EPDCCH transmission mode. The initial transmission method can be centralized or distributed. When the centralized EPDCCH transmission mode is adopted, all EREGs included in one ECCE are located in the same PRB pair. When the distributed EPDCCH transmission mode is adopted, the EREGs included in one ECCE are distributed on different PRB pairs.

S204. Report the narrowband CQI information to the network side device in real time.

The CQI information includes, but is not limited to, a CQI index value, a modulation mode, an encoding rate, an efficiency, and the like. Each CQI index value corresponds to a different modulation value, coding rate, and efficiency. The network side device determines, according to the CQI information, whether the channel environment of the terminal device reaches a preset threshold. According to the definition of each CQI index value and the meaning of its representation in the 3GPP-LTE 36213 protocol, the CQI index value of 10 or more modulation modes may be 64QAM, and the channel environment is good, and the D-EPDCCH mechanism may be activated. Therefore, in the present embodiment, the threshold is set to 10.

The network side device compares the CQI index value reported by the terminal device with the threshold. If the CQI index value reaches the threshold, it is determined whether the initial transmission mode is distributed. If the threshold is reached, it is determined that the D-EPDCCH mechanism is used for EPDCCH transmission. If the threshold is not reached, it is determined to continue. The EPDCCH transmission is performed using the initial transmission mode. If the CQI index value does not reach the threshold, it is determined whether the initial transmission mode is centralized. If the initial transmission mode is centralized, it is determined that the D-EPDCCH mechanism is used for EPDCCH transmission. If the initial transmission mode is not centralized, then the determination is performed. The EPDCCH transmission is continued using the initial transmission mode.

S206. Receive a notification message sent by the network side device to perform EPDCCH transmission by using a D-EPDCCH mechanism.

In step S206, when the network side device determines to use the D-EPDCCH mechanism to perform EPDCCH transmission, the DCI format1A notifies the terminal device to perform the EPDCCH transmission message by using the D-EPDCCH mechanism. The flag of the EPDCCH is sent in the DCI format1A. If the flag is true, the EPDCCH information to be received by the terminal device will be transmitted by using the D-EPDCCH mechanism. If the flag is false, the EPDCCH information to be received by the terminal device is indicated. It will continue to transmit using the initial EPDCCH transmission mode. The terminal device detects the received DCI format1A, and can know whether the network side device is to use the D-EPDCCH mechanism to perform EPDCCH transmission, so as to prepare for receiving.

S208. Receive a message sent by the network side device by using a dynamic EPDCCH mechanism according to the received notification message.

In step S208, when the CQI index value in the CQI information reaches the threshold, and the initial transmission mode is distributed, the network side device determines a frequency domain location with a better EPDCCH channel quality according to the narrowband position reported by the terminal device, and The EPDCCH information is sent on the frequency domain PRB pair with better channel quality. The terminal device centrally receives the EPDCCH information sent by the network side device from the frequency domain PRB pair, and then performs demodulation.

When the CQI index value does not reach the threshold, and the initial transmission mode is centralized, the network side device determines a frequency domain location with a relatively good EPDCCH channel quality according to the narrowband position reported by the terminal device, and distributes the EPDCCH information in these The channel quality is relatively good on the frequency domain PRB pair. The terminal device decentralizes the EPDCCH information sent by the network side device from the frequency domain PRB pair, and then performs demodulation.

The terminal device may report the narrowband position in the CQI information reported by the network side device, or may report the report after receiving the report request sent by the network side device.

Embodiments of the present invention further provide a computer readable storage medium storing a computer executable The instructions, when the computer executable instructions are executed, implement the above method.

As shown in FIG. 3, the third embodiment of the present application provides a network side device 300, which is included in an LTE-A communication system, and the LTE-A communication system further includes a terminal device 400. The network side device 300 may be an eNB. The terminal device 400 can be a mobile phone, a smart phone, a notebook computer, a computer, or the like.

The network side device 300 transmits EPDCCH information to the terminal device 400 when cross-carrier scheduling occurs. In this embodiment, the network side device 300 includes an checking unit 302, a configuration unit 304, a receiving unit 306, a determining unit 308, a determining unit 310, and a sending unit 312.

The checking unit 302 is configured to check whether the terminal device 400 that needs to perform cross-carrier scheduling supports the D-EPDCCH mechanism before the configuration unit sends the initial enhanced physical downlink control channel EPDCCH configuration information. The D-EPDCCH mechanism refers to dynamically adjusting the transmission mode of the EPDCCH according to the current channel environment of the terminal device.

The checking unit 302 queries the terminal device 400 for EPDCCH capability information, for example, by transmitting a UE Capability Inquiry command to the terminal device 400. In this embodiment, the EPDCCH capability information mainly includes whether the terminal device 400 supports the D-EPDCCH mechanism. The terminal device 400 reports its own EPDCCH capability information to the checking unit 302, for example, in the UE Information message. A flag is set in the message. If the flag bit is true, the terminal device 400 supports the D-EPDCCH mechanism. If the flag bit is false, the terminal device 400 does not support the D-EPDCCH mechanism.

The configuration unit 304 is configured to deliver initial EPDCCH configuration information when the terminal device 400 supports the D-EPDCCH mechanism.

The configuration unit 304 delivers the initial EPDCCH configuration information by using an RRC Connection Reconfiguration message. The initial EPDCCH configuration information includes, but is not limited to, an initial EPDCCH transmission mode. The initial transmission method can be centralized or distributed.

The receiving unit 306 is configured to receive narrowband CQI information reported by the terminal device 400 in real time.

The CQI information includes, but is not limited to, a CQI index value, a modulation mode, an encoding rate, an efficiency, and the like. Each CQI index value corresponds to a different modulation value, coding rate, and efficiency.

The determining unit 308 is configured to determine, according to the CQI information, that the channel environment of the terminal device is Whether the preset threshold is reached.

According to the definition of each CQI index value and its representative meaning in the 3GPP-LTE TS 36.213 protocol, the CQI index value reaches 10 or more, and the modulation mode can be 64QAM. In this case, the channel environment is good, and the D-EPDCCH mechanism can be started. Therefore, in the present embodiment, the threshold is set to 10. The determining unit 308 compares the CQI index value reported by the terminal device 400 with the threshold. If the CQI index value reaches the threshold, step S108 is performed. If the CQI index value does not reach the threshold, step S118 is performed.

The determining unit 308 is configured to continue to determine whether the initial transmission mode is distributed when the channel environment of the terminal device 400 reaches a threshold.

The determining unit 308 can query the initial transmission mode according to the initial EPDCCH configuration information. In this embodiment, when the CQI index value reaches the threshold, that is, the current channel environment is good, the D-EPDCCH mechanism considers that it is not necessary to continue to use distributed transmission, but should concentrate the EPDCCH information on the channel quality. The frequency domain location is transmitted for the terminal device 400 to receive and demodulate.

The determining unit 310 is configured to notify the terminal device to use the D-EPDCCH mechanism to transmit when the initial transmission mode is distributed.

The determining unit 310 may notify the terminal device 400 through the DCI format 1A that the EPDCCH transmission using the D-EPDCCH mechanism is performed. The flag of the EPDCCH is sent in the format of the DCI format1A. If the flag is true, it indicates that the EPDCCH information to be received by the terminal device 400 will be sent by using the D-EPDCCH mechanism. If the flag is false, the terminal device 400 is to receive. The EPDCCH information will continue to be transmitted using the initial transmission method. The terminal device 400 detects the received DCI format1A, and can know whether the network side device 300 is to use the D-EPDCCH mechanism for EPDCCH transmission to prepare for reception.

The determining unit 310 is further configured to determine a frequency domain location with a better channel quality according to the narrowband position reported by the terminal device 400.

The determining unit 310 determines the frequency domain location with better EPDCCH channel quality according to the narrowband position reported by the terminal device 400, and sends the EPDCCH information on the frequency domain PRB pair with better channel quality.

The sending unit 312 is configured to perform EPDCCH transmission to the terminal device 400 through the determined frequency domain location.

After determining unit 310 determines a frequency domain location with a better channel quality, transmitting unit 312 will The EPDCCH information is sent to the terminal device 400 on the frequency domain PRB pair with better channel quality. Such a transmission mode facilitates frequency domain scheduling gain and demodulation of EPDCCH information by the terminal device 400.

The determining unit 310 is further configured to continue to use the initial transmission mode to perform EPDCCH transmission when the channel environment reaches a threshold and the initial transmission mode is centralized.

In this embodiment, when the CQI index value reaches the threshold, that is, the current channel environment is good, if the initial transmission mode is already centralized, the D-EPDCCH mechanism considers that the transmission mode of the EPDCCH does not need to be changed, and may continue. The EPDCCH transmission is performed to the terminal device 400 by using the initial transmission mode.

The determining unit 308 is further configured to continue to determine whether the initial transmission mode is centralized when the channel environment of the terminal device 400 does not reach the threshold.

In this embodiment, when the CQI index value does not reach the threshold, that is, the current channel environment is poor, the D-EPDCCH mechanism considers that the centralized transmission should not be continued, but the EPDCCH information should be dispersed in the channel quality. Good frequency domain location is sent to increase the transmission rate.

The determining unit 310 is further configured to notify the terminal device 400 to perform EPDCCH transmission by using a D-EPDCCH mechanism when the initial transmission mode is centralized.

The determining unit 310 notifies the terminal device 400 through the DCI format 1A of the message that the EPDCCH transmission is performed using the D-EPDCCH mechanism. The terminal device 400 knows that the network side device 300 is to perform EPDCCH transmission by using the D-EPDCCH mechanism through the received DCI format 1A, so as to prepare for reception.

The determining unit 310 is configured to notify the terminal device to use a dynamic EPDCCH mechanism to transmit when the channel environment does not reach the threshold, and the initial transmission mode is centralized, and determine according to the narrowband position reported by the terminal device 400. A frequency domain location with relatively good channel quality.

The determining unit 310 determines a frequency domain location with a relatively good EPDCCH channel quality according to the narrowband position reported by the terminal device 400, and distributes the EPDCCH information on the frequency domain PRB pair with relatively good channel quality.

The transmitting unit 312 is configured to perform EPDCCH transmission to the terminal device 400 by using the determined plurality of frequency domain locations.

After determining unit 310 determines a plurality of frequency domain locations with relatively good channel quality, transmitting unit 312 The EPDCCH information is dispersed and transmitted to the terminal device 400 on the frequency domain PRB pair with relatively good channel quality. Such a transmission mode is advantageous for increasing the transmission rate of the EPDCCH.

The determining unit 310 is further configured to determine to continue to use the initial transmission mode for EPDCCH transmission when the channel environment does not reach the threshold and the initial transmission mode is distributed.

In this embodiment, when the CQI index value does not reach the threshold, that is, the current channel environment is poor, if the initial transmission mode is already distributed, the D-EPDCCH mechanism considers that the transmission mode of the EPDCCH does not need to be changed, The EPDCCH transmission to the terminal device 400 is continued using the initial transmission mode.

As shown in FIG. 4, the fourth embodiment of the present application provides a terminal device 400, which is included in an LTE-A communication system, and the LTE-A communication system further includes a network side device 300. The terminal device 400 can be a mobile phone, a smart phone, a notebook computer, a computer, or the like. The network side device 300 may be an eNB.

The terminal device 400 is configured to receive the network side device 300 to transmit information when cross-carrier scheduling occurs. In this embodiment, the terminal device 400 includes a reporting unit 402, a first receiving unit 404, and a second receiving unit 406 in addition to the necessary input, output, sensing, storage, control, power, and the like.

The reporting unit 402 is configured to report the EPDCCH capability information of the terminal device 400 to the network side device 300.

In this embodiment, the EPDCCH capability information mainly includes whether the terminal device 400 supports the D-EPDCCH mechanism. The D-EPDCCH mechanism refers to dynamically adjusting the transmission mode of the EPDCCH according to the current channel environment of the terminal device 400.

When the terminal device 400 needs cross-carrier scheduling, the network-side device 300 needs to transmit EPDCCH information to the terminal device 400. The network side device 300 queries the terminal device 400 for EPDCCH capability information, for example, by sending a UE Capability Inquiry command to the terminal device 400. The reporting unit 402 of the terminal device 400 reports its own EPDCCH capability information to the network side device 300, for example, in the UE Information message. A flag is set in the message. If the flag bit is true, the terminal device 400 supports the D-EPDCCH mechanism. If the flag bit is false, the terminal device 400 does not support the D-EPDCCH mechanism.

The first receiving unit 404 is configured to receive the network side device in an initially configured transmission manner. 300 EPDCCH configuration information sent.

The network side device 300 delivers initial EPDCCH configuration information through an RRC Connection Reconfiguration message. The initial EPDCCH configuration information includes, but is not limited to, an initial EPDCCH transmission mode. The initial transmission method can be centralized or distributed.

The reporting unit 402 is further configured to report the narrowband CQI information to the network side device 300 in real time.

The CQI information includes, but is not limited to, a CQI index value, a modulation mode, an encoding rate, an efficiency, and the like. Each CQI index value corresponds to a different modulation value, coding rate, and efficiency. The network side device 300 determines, according to the CQI information, whether the channel environment of the terminal device 400 reaches a preset threshold. According to the definition of each CQI index value and its representative meaning in the 3GPP-LTE TS 36.213 protocol, the CQI index value reaches 10 or more, and the modulation mode can be 64QAM. In this case, the channel environment is good, and the D-EPDCCH mechanism can be started. Therefore, in the present embodiment, the threshold is set to 10.

The network side device 300 compares the CQI index value reported by the reporting unit 402 with the threshold. If the CQI index value reaches the threshold, it is determined whether the initial transmission mode is distributed. If the threshold is reached, it is determined that the D-EPDCCH mechanism is used for EPDCCH transmission. If the threshold is not reached, it is determined to continue to use the initial transmission. The mode performs EPDCCH transmission. If the CQI index value does not reach the threshold, it is determined whether the initial transmission mode is centralized. If the initial transmission mode is distributed, the D-EPDCCH mechanism is used for EPDCCH transmission. If the initial transmission mode is not distributed, it is determined to continue. The EPDCCH transmission is performed using the initial transmission mode.

The second receiving unit 404 is configured to receive a notification message sent by the network side device 300 and sent by using a D-EPDCCH mechanism.

When the network side device 300 determines to transmit using the D-EPDCCH mechanism, the DCI format 1A notifies the terminal device 400 of the message to be transmitted by using the D-EPDCCH mechanism. The flag of the EPDCCH is sent in the format of the DCI format1A. If the flag is true, it indicates that the EPDCCH information to be received by the terminal device 400 will be sent by using the D-EPDCCH mechanism. If the flag is false, the terminal device 400 is to receive. The EPDCCH information will continue to be transmitted using the initial transmission method. The second receiving unit 406 detects the received DCI format1A, and can know whether the network side device 300 is to be transmitted by using the D-EPDCCH mechanism to prepare for receiving.

The second receiving unit 406 is further configured to adopt dynamic according to the received notification message. The EPDCCH mechanism receives information transmitted by the network side device 300.

When the CQI index value in the CQI information reaches the threshold, and the initial transmission mode is distributed, the network side device 300 determines a frequency domain location with a better EPDCCH channel quality according to the narrowband position reported by the reporting unit 402, and concentrates the EPDCCH information. It is sent on the frequency domain PRB pair with better channel quality. The second receiving unit 406 centrally receives the EPDCCH information sent by the network side device 300 from the frequency domain PRB pair, and then performs demodulation.

When the CQI index value does not reach the threshold, and the initial transmission mode is centralized, the network side device 300 determines a frequency domain location with a relatively good EPDCCH channel quality according to the narrowband position reported by the reporting unit 402, and distributes the EPDCCH information. Transmitted on the frequency domain PRB pair with relatively good channel quality. The second receiving unit 406 discretely receives the EPDCCH information transmitted by the network side device 300 from the frequency domain PRB pair, and then performs demodulation.

The reporting unit 402 of the terminal device 400 may report the narrowband location in the CQI information reported by the network side device 300, or may perform the reporting after receiving the reporting request sent by the network side device 300.

It is to be understood that the term "comprises", "comprising", or any other variants thereof, is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes those elements. It also includes other elements that are not explicitly listed, or elements that are inherent to such a process, method, article, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and can also be implemented by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the methods described in various embodiments of the present application.

One of ordinary skill in the art will appreciate that all or part of the steps in the above methods may be passed through the program. The instructions are related to hardware (eg, a processor) that can be stored in a computer readable storage medium, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function. Embodiments of the invention are not limited to any specific form of combination of hardware and software.

The preferred embodiments of the present application have been described above with reference to the drawings, and are not intended to limit the scope of the application. The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. Additionally, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

A person skilled in the art can implement the present application in various variants without departing from the scope and spirit of the present application. For example, the features as one embodiment can be used in another embodiment to obtain another embodiment. Any modifications, equivalent substitutions and improvements made within the technical concept of the application should be within the scope of the application.

Industrial applicability

The present application proposes an EPDCCH transmission method, a network side device, and a terminal device. The EPDCCH transmission method includes: determining whether to change the EPDCCH transmission mode according to the CQI information reported by the terminal device and the initially configured transmission mode, and according to the narrowband reported by the terminal device. The location determines the frequency domain location with better channel quality for transmission, thereby dynamically adjusting the transmission mode of the EPDCCH according to the real-time channel state. In this way, the channel environment can be transmitted in a centralized manner, which facilitates the frequency domain scheduling gain and the terminal device to demodulate the received information, and distributes the transmission when the channel environment is poor, thereby improving the EPDCCH transmission rate, thereby obtaining a practical and simple self. Adapt to the technical solution of transmission.

Claims

An enhanced physical downlink control channel EPDCCH transmission method is applied to a network side device of a communication system, and the method includes:

The initial EPDCCH configuration information is sent, where the initial EPDCCH configuration information includes an initial EPDCCH transmission mode, where the initial transmission mode includes centralized or distributed.

Receiving narrowband channel quality indication CQI information reported by the terminal device in real time;

Determining, according to the CQI information, whether a channel environment of the terminal device reaches a preset threshold;

When the channel environment reaches a threshold and the initial transmission mode is distributed, the EPDCCH transmission mode is changed to a centralized mode according to a dynamic EPDCCH mechanism;

When the channel environment does not reach the threshold and the initial transmission mode is centralized, the EPDCCH transmission mode is changed to distributed according to the dynamic EPDCCH mechanism.
The method of claim 1, before the step of delivering the initial EPDCCH configuration information, the method further includes:

Checking whether the terminal device that needs to perform cross-carrier scheduling supports the dynamic EPDCCH mechanism.
The transmission method according to claim 1, wherein the step of changing the EPDCCH transmission mode to the centralized according to the dynamic EPDCCH mechanism comprises:

Notifying that the terminal device will send by using a dynamic EPDCCH mechanism;

Determining a frequency domain location with better channel quality according to the narrowband position reported by the terminal device; and

Transmitting to the terminal device by the one frequency domain location.
The transmission method according to claim 1, wherein the step of changing the EPDCCH transmission mode to distributed according to the dynamic EPDCCH mechanism comprises:

Notifying that the terminal device will send by using a dynamic EPDCCH mechanism;

Determining a plurality of frequency domain locations with relatively good channel quality according to the narrowband position reported by the terminal device; and

Transmitting to the terminal device by the plurality of frequency domain locations.
The transmission method according to claim 1, further comprising:

When the channel environment reaches the threshold, and the initial transmission mode is centralized, or when the channel environment does not reach the threshold, and the initial transmission mode is distributed, the transmission mode of the original EPDCCH is continued to be used for transmission.
An enhanced physical downlink control channel EPDCCH transmission method is applied to a terminal device of a communication system, and the method includes:

Receiving the enhanced physical downlink control channel EPDCCH configuration information sent by the network side device in an initially configured transmission manner, where the initial transmission mode includes centralized or distributed;

Reporting the narrowband channel quality indication CQI information to the network side device in real time;

Receiving, by the network side device, a notification message sent by using a dynamic EPDCCH mechanism; and

The dynamic EPDCCH mechanism is used to receive information sent by the network side device according to the received notification message.
The method of claim 6, before the step of receiving the EPDCCH configuration information sent by the network side device in the initially configured transmission mode, the method further includes:

EPDCCH capability information of the terminal device is reported to the network side device, where the EPDCCH capability information includes whether the terminal device supports a dynamic EPDCCH mechanism.
A network side device, including:

a configuration unit, configured to send an initial enhanced physical downlink control channel EPDCCH configuration information, where the initial EPDCCH configuration information includes an initial EPDCCH transmission mode, where the initial transmission mode includes centralized or distributed;

The receiving unit is configured to receive the narrowband channel quality indication CQI information reported by the terminal device in real time;

The determining unit is configured to determine, according to the CQI information, whether a channel environment of the terminal device reaches a preset threshold, and determine whether the initial transmission mode is distributed or centralized;

a determining unit, configured to: when the channel environment reaches a threshold, and the initial transmission mode is distributed, determining to change an EPDCCH transmission mode to a centralized mode according to a dynamic EPDCCH mechanism; when the channel environment does not reach a threshold, and When the initial transmission mode is centralized, according to the dynamic EPDCCH The mechanism determines to change the EPDCCH transmission mode to distributed; and

The transmitting unit is configured to send information to the terminal device by using a transmission mode of the changed EPDCCH determined according to the dynamic EPDCCH mechanism.
The network side device according to claim 8, wherein the network side device further comprises:

The checking unit is configured to check whether the terminal equipment that needs to perform cross-carrier scheduling supports the dynamic EPDCCH mechanism before the initial enhanced physical downlink control channel EPDCCH configuration information is sent by the configuration unit.
The network side device according to claim 8, wherein

The determining unit is configured to notify the terminal device to use a dynamic EPDCCH mechanism to transmit when the channel environment reaches a threshold, and the initial transmission mode is distributed, and determine according to the narrowband position reported by the terminal device. a frequency domain location with better channel quality;

The sending unit is configured to perform centralized transmission to the terminal device by using the one frequency domain location.
The network side device according to claim 8, wherein

The determining unit is configured to notify the terminal device to use a dynamic EPDCCH mechanism to transmit according to the narrowband position reported by the terminal device, when the channel environment does not reach the threshold, and the initial transmission mode is centralized. Determining a frequency domain location with relatively good channel quality;

The sending unit is configured to transmit to the terminal device by using the plurality of frequency domain locations.
The network side device according to claim 8,

The determining unit is further configured to: when the channel environment reaches a threshold, and the initial transmission mode is centralized, or when the channel environment does not reach a threshold, and the initial transmission mode is distributed, continue to adopt an initial The transmission mode of the EPDCCH is transmitted.
A terminal device comprising:

The first receiving unit is configured to receive the enhanced physical downlink control channel EPDCCH configuration information sent by the network side device in an initially configured transmission manner, where the initial transmission mode includes centralized or distributed;

The reporting unit is configured to report the narrowband channel quality indication CQI information to the network side device in real time; and

The second receiving unit is configured to receive the notification message that is sent by the network side device and that is sent by using the dynamic EPDCCH mechanism, and receive the information sent by the network side device by using the dynamic EPDCCH mechanism according to the received notification message.
The terminal device according to claim 13,

The reporting unit is further configured to report EPDCCH capability information of the terminal device to the network side device before the first receiving unit receives the EPDCCH configuration information sent by the network side device in an initially configured transmission manner, where the EPDCCH is sent. The capability information includes whether the terminal device supports a dynamic EPDCCH mechanism.