WO2013139197A1

WO2013139197A1 - Method and device for transmitting enhanced downlink control channel

Info

Publication number: WO2013139197A1
Application number: PCT/CN2013/072024
Authority: WO
Inventors: 张然然; 拉盖施; 赵锐; 潘学明
Original assignee: 电信科学技术研究院
Priority date: 2012-03-20
Filing date: 2013-02-28
Publication date: 2013-09-26
Also published as: CN102594513B; CN102594513A

Abstract

The application relates to communications technologies. Disclosed are a method and a device for transmitting an enhanced downlink control channel. Time frequency resources are allocated to an E-PDCCH according to a preset search space in a preset time frequency resource range in a subframe, so as to enable a user equipment to obtain time frequency resources used probably by the E-PDCCH after receiving an MIB transmitted by a PBCH, so that blind detection can be performed on corresponding time frequency resources and a DCI can be received on the E-PDCCH.

Description

Enhanced downlink control channel transmission method and device

The present application claims priority to Chinese Patent Application No. 201210074680.2, entitled "Augmented Transmission Channel Method and Apparatus for Enhanced Downlink Control Channels", filed on March 20, 2012, the entire contents of which are incorporated by reference. Combined in this application. Technical field

The present invention relates to communications technologies, and in particular, to an enhanced downlink control channel transmission method and apparatus. Background technique

In the LTE (Long Term Evolution) system, a PDCCH (physical downlink control channel) is transmitted in each radio subframe and formed with a physical downlink shared channel (PDSCH). The multiplexing relationship of TDM (time division multiplexing), as shown in FIG. 1, is used to transmit a PDCCH, and a data area is used to transmit a PDSCH. The PDCCH is transmitted by the first N OFDM (orthogonal frequency division multiplexing) symbols of one downlink subframe, where the value of N may be 1, 2, 3 or 4, and N=4 is only allowed to appear in The system bandwidth is 1.4MHz.

After receiving the PSS (primary synchronous signal) and the SSS (secondary synchronous signal), the user equipment can complete the initial cell search and obtain the downlink synchronization and cell ID (cell ID). The MIB (master information block) information transmitted on the PBCH (physical broadcast channel) is received on the center 1.4 MHz band in the system bandwidth, thereby reading the system bandwidth, the system frame number, and the PHICH indicator channel. (physical hybrid ARQ indictor channel; physical hybrid automatic repeat request; ARQ: automatic repeat request, automatic repeat request) configuration. The frequency domain resource location of the PCFICH (physical control format indicator channel) can be determined based on the system bandwidth and the cell ID, so that the CFI (control format indicator) is received to determine the OFDM occupied by the PDCCH. Divided multiplexing, orthogonal frequency division multiplexing, the number of symbols, thereby determining the time-frequency resources used by the PDCCH. The specific time-frequency resource location of each PDCCH channel is completed by blind detection, thereby implementing PDCCH reception, completing high-level signaling scheduling information reading and corresponding information reception such as SI (system information).

The control region for transmitting the PDCCH in the LTE system is composed of a logically divided CCE (control channel element), and the mapping of the CCE to the RE (resource element) uses a completely interleaved manner. The transmission of the DCI is also based on the CCE. A DCI for one UE (user equipment) can be transmitted in N consecutive CCEs. In the LTE system, the possible values of N are 1, 2, 4 or 8, called the CCE aggregation level.

The UE performs PDCCH blind detection in the control region to search whether there is a PDCCH for the PDCCH, where The blind detection is specifically: using the RNTI (radio network temporary identifier) of the UE to perform decoding attempts on different DCI formats and CCE aggregation levels, and if the decoding is correct, determining that the DCI is for the UE, and receiving . In the LTE system, each downlink subframe in the DRX (discontinuous reception) state needs to perform blind detection on its control region to search for the PDCCH.

In order to achieve the goals of expansion capacity, frequency domain interference coordination, and multi-antenna gain, LTE version 11 ( Release 11 ,

R11) DCI transmission, that is, E-PDCCH (enhanced PDCCH), will be performed in the PDSCH region. One solution is to: transmit the enhanced PDCCH in the PDSCH domain in the downlink subframe while retaining the original PDCCH domain.

As shown in Figure 2, the original PDCCH region still uses the existing PDCCH resources, and the original PDCCH region is called the legacy PDCCH (original PDCCH) domain. The enhanced PDCCH domain can use more advanced transmission and reception technologies, such as precoding when transmitting, and detecting based on UERS (UE-specific reference signal), and occupying time-frequency resources other than the legacy PDCCH domain. The PDCCH is partially multiplexed with the PDSCH by frequency division. The PDCCH region is called the E-PDCCH region. A scheme in which the E-PDCCH and the PDSCH are multiplexed by means of FDM (frequency division multiplexing) is called an FDM E-PDCCH.

If the legacy PDCCH domain and the E-PDCCH domain are both present, if the user equipment has the capability of receiving the PDCCH and the E-PDCCH, the scheduling of the high-level signaling information related to the system information and the E-PDCCH configuration may be completed by using the PDCCH. Thereby ensuring transmission and reception of the E-PDCCH. Such an E-PDCCH is referred to as a legacy PDCCH-dependent E-PDCCH.

On the one hand, with the rapid development of MTC (machine type communication) services, traditional sensor networks are facing more and more limitations and challenges. It is urgent to combine sensor networks and mobile communication networks to make full use of mobile communication coverage. High reliability and low transmission delay. In order to meet the requirements of the MTC service, the LTE downlink evolution system will consider optimizing the system and transmission technology to accommodate the MTC user equipment to support fewer radio frequency bands, smaller bandwidth processing capability, more single-antenna processing capability, and more Flexible throughput and caching capabilities, more mobility, and only PS domain support.

A user equipment with limited bandwidth cannot receive the PDCCH transmitted by the full bandwidth, and cannot receive the DCI transmitted by the legacy PDCCH. Therefore, the system information and high layer signaling information scheduled by the legacy PDCCH cannot be received. Obviously, E-PDCCH technology relying on legacy PDCCH cannot support bandwidth-limited MTC user equipment.

On the other hand, in order to improve spectrum utilization efficiency and ensure hotspot coverage, considering the unique advantages of non-backward compatible carriers in spectrum efficiency improvement, interference suppression under heterogeneous networks, energy conservation, etc., regarding non-backward compatible carriers The new application scenario and detailed design plan will be obtained in the LTE-Advanced Release-11 (LTE Evolution Release 11) phase. further research. The extension carrier is a non-backward compatible carrier, and there is no legacy PDCCH on the extension carrier. The E-PDCCH technology relying on the legacy PDCCH also cannot support such carriers to operate independently of other carriers. Summary of the invention

The embodiment of the invention provides an enhanced downlink control channel transmission method and device, so that the user equipment does not rely on the legacy PDCCH to receive the E-PDCCH.

An enhanced transmission method of a downlink control channel includes:

The user equipment determines to receive the E-PDCCH;

The user equipment performs blind detection according to a preset search space within the determined E-PDCCH time-frequency resource range to receive the E-PDCCH.

An enhanced transmission method of a downlink control channel includes:

When the enhanced downlink control channel E-PDCCH needs to be sent, the time-frequency resource is allocated to the E-PDCCH according to a preset search space in a preset time-frequency resource range in the subframe;

Transmitting the E-PDCCH to a user equipment.

An enhanced downlink control channel transmission apparatus includes:

a determining unit, configured to determine to receive an E-PDCCH;

The receiving unit is configured to perform blind detection according to a preset search space within the determined E-PDCCH time-frequency resource range to receive the E-PDCCH.

An enhanced downlink control channel transmission apparatus includes:

a resource allocation unit, configured to allocate a time-frequency resource to the E-PDCCH according to a preset search space in a preset time-frequency resource range in a preset time-frequency resource range in the subframe;

And a sending unit, configured to send the E-PDCCH to the user equipment.

An embodiment of the present invention provides an enhanced downlink control channel transmission method and apparatus, which allocates time-frequency resources to an E-PDCCH according to a preset search space in a preset time-frequency resource range in a subframe, so that the user equipment is in the After receiving the MIB of the PBCH transmission, the time-frequency resource that may be used by the E-PDCCH can be obtained, so that the blind detection can be performed on the corresponding time-frequency resource to receive the DCI on the E-PDCCH. DRAWINGS

1 is a schematic diagram of multiplexing relationship between a control area and a data area in a downlink subframe in the prior art;

2 is a schematic structural diagram of an enhanced PDCCH in the prior art;

FIG. 3 is a flowchart of an enhanced downlink control channel transmission method according to an embodiment of the present disclosure;

4 is a second flowchart of an enhanced downlink control channel transmission method according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an apparatus for transmitting an enhanced downlink control channel according to an embodiment of the present disclosure; FIG. 6 is a second schematic structural diagram of an apparatus for transmitting an enhanced downlink control channel according to an embodiment of the present invention. detailed description

An embodiment of the present invention provides an enhanced downlink control channel transmission method and apparatus, which allocates time-frequency resources to an E-PDCCH according to a preset search space in a preset time-frequency resource range in a subframe, so that the user equipment is in the After receiving the MIB of the PBCH transmission, the time-frequency resource that may be used by the E-PDCCH can be obtained, so that the blind detection can be performed on the corresponding time-frequency resource to receive the DCI on the E-PDCCH. As shown in FIG. 3, the enhanced downlink control channel transmission method provided by the embodiment of the present invention includes:

Step S301: The user equipment determines to receive the E-PDCCH.

Step S302: The user equipment performs blind detection according to a preset search space within the determined E-PDCCH time-frequency resource range to receive the E-PDCCH.

Since the E-PDCCH is transmitted by using the time-frequency resource in the set range, the user equipment can perform blind detection according to the preset search space within the determined E-PDCCH time-frequency resource range without receiving the legacy PDCCH. Thereby, the reception of the E-PDCCH is achieved.

In step S301, the user equipment determines to receive the E-PDCCH, and specifically includes:

The user equipment determines to receive the E-PDCCH according to the received information field for indicating the E-PDCCH configuration, where the information field is used to indicate that the E-PDCCH transmission mode of the user equipment is an legacy PDCCH-free E-PDCCH transmission. The information field used to indicate the E-PDCCH configuration may be set in the MIB transmitted by the PBCH.

The information field is usually 1-bit information. For example, 0 means that the system does not support E-PDCCH transmission without relying on legacy PDCCH, and 1 means that the system supports E-PDCCH transmission without legacy PDCCH.

When the system does not support the legacy PDCCH-based E-PDCCH transmission, the user equipment does not receive the E-PDCCH. When the system supports the legacy PDCCH-free E-PDCCH transmission, the user equipment with the E-PDCCH receiving capability can The E-PDCCH transmission method provided by the embodiment of the present invention performs E-PDCCH reception.

In the embodiment of the present invention, the preset search space may be a common search space, or the search space may be agreed according to actual conditions.

Specifically, from the time domain, the determined E-PDCCH time domain resource range may be: L1 L2 OFDM symbols in the subframe, where:

L1 may be a preset fixed value. For example, the L1 value may be set to 4. At this time, the E-PDCCH starts with the OFDM symbol number 1 = 3, and 1 is numbered from 0.

L1 can also be set according to the system bandwidth. For example, when the number of PRBs (physical resource blocks) included in the system bandwidth is less than or equal to 10, the L1 value is 5, and the E-PDCCH starts with an OFDM symbol number of 1=4. When the number of PRBs included in the system bandwidth is greater than 10, the L1 value is 4, and the E-PDCCH starts with an OFDM symbol number of 1=3. L2 is usually a preset fixed value. For example, in a normal subframe of a regular CP (cyclic prefix), the L2 value can be set to 7, indicating that the E-PDCCH is in the first time slot of one subframe. For transmission, the L2 value can also be set to 14, indicating that the E-PDCCH is transmitted in 2 slots of one subframe; in the normal subframe of the extended CP, the L2 value can be set to 6, indicating that the E-PDCCH is in one The first one time slot of the subframe is transmitted, and the L2 value may also be set to 12, indicating that the E-PDCCH is transmitted in two slots of one subframe; in the special subframe, L2 depends on the OFDM symbol included in the DwPTS. The E-PDCCH time domain range ends with the end symbol of the DwPTS (downlink pilot time slot).

When the user equipment needs to receive the E-PDCCH for scheduling SIB1 (system information block type 1), which is scrambled by the SI-RNTI (system information-radio network temporary identity) , blind detection and reception can be further performed in a preset subframe. For example, the E-PDCCH transmission may be performed in the subframe 5 of the even radio frame, and the radio frame set at SFN mod 8=0 is transmitted for the first time, where the SFN is the system frame number, and is transmitted by receiving the PBCH. MIB information is available.

Further, from a frequency domain, the determined E-PDCCH frequency domain resource range may be: a pre-agreed M PRBs in a subframe, where M is a pre-agreed fixed value or indicated by an E-PCFICH (enhanced physical control format) The value indicated by the channel), the value of M is preferably from [3, 6], and the M value can usually be set to 4.

Further, the pre-agreed M PRBs can be dispersed in the entire system bandwidth in the frequency domain, and the design is directed to a user equipment in which the system does not support fewer radio frequency bands and smaller bandwidth processing capabilities; The pre-agreed M PRBs can also be dispersed in the frequency domain in a smaller bandwidth than the system bandwidth, which depends on the minimum bandwidth processing capability allowed by the system. This design supports less RF for the system. The case of a user equipment with a frequency band and a smaller bandwidth processing capability.

Generally, the pre-agreed M PRBs are determined from the cell identifier by the location of the first PRB from the low frequency, or determined by the virtual cell identifier, or determined by the cell identifier and the subframe number, or by the virtual cell identifier and the subframe number. It is determined that the cell identifier or the virtual cell identifier can be obtained by receiving a synchronization signal.

The pre-agreed M PRBs may be continuous or may have a set frequency domain interval, specifically, the fixed

I I

The frequency domain interval can be determined by the bandwidth. For example, the fixed frequency domain interval is ^/M ”, where ^N RB is the number of PRBs included in the system bandwidth or the maximum receiving bandwidth supported by the user equipment, and L ^x ′′ is not greater than X. The maximum integer, or the fixed frequency interval can be set to L ⁶ / ^M ”, and L ^x ” represents the largest integer not greater than X. In this case, if M is greater than or equal to 4, the fixed frequency interval is 1. The actual PRB shields are continuous.

Further, the user equipment may further determine that the E-PDCCH is not transmitted within the E-PDCCH time-frequency resource range. Resource unit, specific:

The user equipment determines that the resource unit occupied by the CRS (common reference signal) is not used for E-PDCCH transmission, and the number of CRS ports is the same as the number of CRS ports used by the PBCH.

The user equipment may also determine that the resource elements occupied by the UERS are not used in the E-PDCCH time-frequency resource range.

E-PDCCH transmission, and the number of UERS ports is the same as the number of UERS ports used by the E-PDCCH;

The user equipment may further determine that the resource unit occupied by the zero-power and non-zero-power CSI-RS in the maximum configuration set of the CSI-RS (channel state information reference signal) is not used in the E-PDCCH time-frequency resource range. E-PDCCH transmission. Alternatively, the user equipment may determine that there is no resource unit occupied by the zero-power or non-zero-power CSI-RS in the E-PDCCH time-frequency resource range.

The embodiment of the present invention further provides a method for transmitting an enhanced downlink control channel on the network side. As shown in FIG. 4, the method includes:

Step S401: When the E-PDCCH needs to be sent, allocate a time-frequency resource to the E-PDCCH according to a preset search space in a preset time-frequency resource range in the subframe;

Step S402: Send an E-PDCCH to the user equipment.

Further, an information field for indicating an E-PDCCH configuration may be sent to the user equipment, where the information field is used to indicate that the E-PDCCH transmission mode of the user equipment is an legacy PDCCH-free E-PDCCH transmission. Therefore, the user equipment can be used to identify whether the system supports E-PDCCH transmission without relying on legacy PDCCH. When the system does not support E-PDCCH transmission without legacy PDCCH, the user equipment does not receive E-PDCCH; when the system supports legacy PDCCH-independent PDCCH, the system does not support legacy PDCCH. When the E-PDCCH is transmitted, the user equipment with the E-PDCCH receiving capability can receive the E-PDCCH according to the E-PDCCH transmission method provided by the embodiment of the present invention.

The information field used to indicate the E-PDCCH configuration may be set to be transmitted in the MIB transmitted by the PBCH.

Specifically, from the time domain, the preset E-PDCCH time domain resource range is: L1 L2 OFDM symbols in the subframe, where:

L1 can also be set according to system bandwidth. For example, when the number of PRBs included in the system bandwidth is less than or equal to 10, the L1 value is 5, and the E-PDCCH starts with an OFDM symbol number of 1=4, which is included in the system bandwidth. When the number of PRBs is greater than 10, the L1 value is 4, and the E-PDCCH starts with an OFDM symbol number of 1=3.

L2 is usually a preset fixed value. For example, in a normal subframe of a normal CP, the L2 value can be set to 7, indicating that the E-PDCCH is transmitted in the first time slot of one subframe, and the L2 value can also be set. Set to 14, indicating that the E-PDCCH is in In the normal time slot of the extended CP, the L2 value can be set to 6, indicating that the E-PDCCH is transmitted in the first time slot of one subframe, and the L2 value can also be set to 12, indicating that the E-PDCCH is transmitted in two slots of one subframe; in the special subframe, L2 depends on the number of OFDM symbols included in the DwPTS, and the E-PDCCH time domain range ends with the end symbol of the DwPTS.

When transmitting the E-PDCCH for scheduling the SIB 1 scrambled by the SI-RNTI, the time-frequency in the preset subframe may be allocated for the E-PDCCH for scheduling the SIB1 scrambled by the SI-RNTI. The resources are such that the user equipment can perform blind detection and reception of the E-PDCCH of the type in a preset subframe.

Further, in the frequency domain, the preset E-PDCCH frequency domain resource range may be: a pre-agreed M PRBs in the subframe, where M is a pre-agreed fixed value or a value indicated by the E-PCFICH, M The value is better from [3, 6], and the M value can usually be set to 4.

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The frequency domain interval can be determined by the bandwidth. For example, the fixed frequency domain interval is ^/M ”, where is the number of PRBs included in the system bandwidth or the maximum received bandwidth supported by the user equipment, and L ^x ” represents the largest integer not greater than X. , or the fixed frequency domain interval can be set to L ⁶ / ^M ”, and L ^x ” represents a maximum integer not greater than X. At this time, if M is greater than or equal to 4, the fixed frequency domain interval is 1, and each PRB The real shield is continuous.

Further, in order to facilitate the user equipment to determine the resource unit that does not transmit the E-PDCCH within the E-PDCCH time-frequency resource range, the time-frequency resource may be allocated according to one or more of the following methods:

In the E-PDCCH time-frequency resource range, the resource unit occupied by the CRS is not used for E-PDCCH transmission, and the number of CRS ports is the same as the number of CRS ports used by the PBCH.

Within the E-PDCCH time-frequency resource range, the resource unit occupied by the UERS is not used for E-PDCCH transmission, and the number of UERS ports is the same as the number of UERS ports used by the E-PDCCH;

Within the E-PDCCH time-frequency resource range, the CSI-RS is occupied by zero-power and non-zero-power CSI-RS in the maximum configuration set of CSI-RS. The used resource unit is not used for E-PDCCH transmission. Or zero-power or non-zero-power CSI-RS is not transmitted in the E-PDCCH time-frequency resource range.

The embodiment of the present invention further provides an enhanced downlink control channel transmission device, which may be specifically a user user equipment. As shown in FIG. 5, the device includes:

a determining unit 501, configured to determine to receive an E-PDCCH;

The receiving unit 502 is configured to perform blind detection according to a preset search space within the determined E-PDCCH time-frequency resource range to receive the E-PDCCH.

The determining unit 501 is specifically configured to:

The receiving E-PDCCH is determined according to the received information field for indicating the E-PDCCH configuration, and the information field is used to indicate that the E-PDCCH transmission mode of the user equipment is an legacy PDCCH-free E-PDCCH transmission. The information field used to indicate the E-PDCCH configuration may be set in the MIB transmitted by the PBCH.

Specifically, the determined E-PDCCH time domain resource range is: L1 L2 OFDM symbols in the subframe, where: L1 is a preset fixed value, or L1 is a value set according to a system bandwidth;

L2 is a preset fixed value.

The receiving unit 502 is also used to:

The E-PDCCH for scheduling the system information block type 1 SIB1 scrambled by the SI-RNTI is received in a preset subframe.

Specifically, the determined E-PDCCH frequency domain resource range is: pre-agreed M PRBs in the subframe, where M is a pre-agreed fixed value or a value indicated by the E-PCFICH.

The receiving unit 502 is also used to:

The resource unit occupied by the common reference signal CRS is not used for E-PDCCH transmission in the E-PDCCH time-frequency resource range, and the number of CRS ports is the same as the number of CRS ports used by the PBCH.

The receiving unit 502 is also used to:

During the E-PDCCH time-frequency resource range, the resource unit occupied by the UERS is not used for E-PDCCH transmission, and the number of UERS ports is the same as the number of UERS ports used by the E-PDCCH.

The receiving unit 502 is also used to:

Determining the E-PDCCH time-frequency resource range, the resource units occupied by the zero-power and non-zero-power CSI-RS in the CSI-RS maximum configuration set are not used for E-PDCCH transmission.

The receiving unit 502 is also used to:

It is determined that there is no resource unit occupied by the CSI-RS in the E-PDCCH time-frequency resource range.

The embodiment of the invention provides an enhanced downlink control channel transmission device, which may be a network side such as a base station. Equipment, as shown in Figure 6, the device includes:

The resource allocation unit 601 is configured to allocate a time-frequency resource to the E-PDCCH according to a preset search space within a preset time-frequency resource range in the subframe when the E-PDCCH needs to be sent;

The sending unit 602 is configured to send an E-PDCCH to the user equipment.

The sending unit 602 is further configured to:

An information field for indicating an E-PDCCH configuration is sent to the user equipment, where the information field is used to indicate that the E-PDCCH transmission mode of the user equipment is an legacy PDCCH-free E-PDCCH transmission. The information field used to indicate the E-PDCCH configuration may be set in the MIB transmitted by the PBCH.

Specifically, the preset E-PDCCH time domain resource range is: L1~L2 OFDM symbols in the subframe, where:

L1 is a preset fixed value, or L1 is a value set according to the system bandwidth;

L2 is a preset fixed value.

The resource allocation unit 601 is also used to:

The time-frequency resource in the preset subframe is allocated for the E-PDCCH for scheduling the SIB 1 scrambled by the SI-RNTI.

The preset E-PDCCH frequency domain resource range is: pre-agreed M PRBs in the subframe, and M is a pre-agreed fixed value or a value indicated by E-PCFICH.

The resource allocation unit 601 is also used to:

The resource unit occupied by the CRS is not used for E-PDCCH transmission in the E-PDCCH time-frequency resource range, and the number of CRS ports is the same as the number of CRS ports used by the PBCH.

The resource allocation unit 601 is also used to:

It is determined that the CSI-RS of zero power and non-zero power is not transmitted within the E-PDCCH time-frequency resource range.

An embodiment of the present invention provides an enhanced downlink control channel transmission method and apparatus, which allocates time-frequency resources to an E-PDCCH according to a preset search space in a preset time-frequency resource range in a subframe, so that the user equipment is in the After receiving the MIB of the PBCH transmission, the time-frequency resources that may be used by the E-PDCCH can be known, so that the corresponding time and frequency can be obtained. Blind detection is performed on the source to receive DCI on the E-PDCCH. Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention is in the form of a computer program product embodied on one or more computer usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

An enhanced downlink control channel transmission method, comprising:

The user equipment determines to receive the enhanced physical downlink control channel E-PDCCH;

The user equipment performs blind detection according to a preset search space within a determined E-PDCCH time-frequency resource range to receive the E-PDCCH.

2. The method according to claim 1, wherein the determining, by the user equipment, that the E-PDCCH is received, specifically includes:

And determining, by the user equipment, the received E-PDCCH according to the received information field for indicating the E-PDCCH configuration, where the information field is used to indicate that the E-PDCCH transmission mode of the user equipment is a legacy PDCCH-independent E-PDCCH transmission. .

3. The method of claim 2, wherein the method further comprises:

The information field for indicating the E-PDCCH configuration is set in the main information block MIB transmitted by the physical broadcast channel PBCH.

4. The method according to claim 1, wherein the preset search space is a common search space.

The method according to claim 1, wherein the determined E-PDCCH time domain resource range is: L1 L2 orthogonal frequency division multiplexing OFDM symbols in a subframe, where:

The L1 is a preset fixed value, or the L1 is a value set according to a system bandwidth;

The L2 is a predetermined fixed value.

6. The method of claim 1, wherein the method further comprises:

The user equipment receives an E-PDCCH for scheduling system information block type 1 SIB1, which is scrambled by the system information radio network temporary identifier SI-RNTI, in a preset subframe.

The method according to claim 1, wherein the determined E-PDCCH frequency domain resource range is: a pre-agreed M physical resource block PRB in the subframe, where M is a pre-agreed fixed value or The enhanced physical control format indicates the value indicated by the channel E-PCFICH.

8. The method according to claim 7, wherein the pre-agreed M PRBs have a set frequency domain interval.

The method according to claim 7, wherein the pre-agreed M PRBs are determined by a cell identifier from a low frequency starting from a low frequency, or determined by a virtual cell identifier, or by a cell identifier. The symbol and subframe number are determined, or determined by the virtual cell identifier and the subframe number.

10. The method of claim 1, wherein the method further comprises:

Determining, by the user equipment, resources occupied by the common reference signal CRS in the E-PDCCH time-frequency resource range The unit is not used for E-PDCCH transmission, and the number of CRS ports is the same as the number of CRS ports used by the PBCH.

The method according to claim 1, wherein the method further comprises:

The user equipment determines that the resource unit occupied by the user-specific reference signal UERS is not used for E-PDCCH transmission in the E-PDCCH time-frequency resource range, and the number of UERS ports is the same as the number of UERS ports used by the E-PDCCH. .

12. The method of claim 1, further comprising:

The user equipment determines that the resource unit occupied by the zero-power and non-zero-power CSI-RS under the channel state information reference signal CSI-RS maximum configuration set is not used for E-PDCCH transmission within the E-PDCCH time-frequency resource range.

13. The method according to claim 1, wherein the method further comprises:

The user equipment determines that there is no resource unit occupied by the CSI-RS in the E-PDCCH time-frequency resource range.

14. An enhanced downlink control channel transmission method, comprising:

Transmitting the E-PDCCH to a user equipment.

The method according to claim 14, wherein the method further comprises:

An information field for indicating an enhanced downlink control channel E-PDCCH configuration is sent to the user equipment, where the information field is used to indicate that the E-PDCCH transmission mode of the user equipment is an legacy PDCCH-free E-PDCCH transmission.

The method according to claim 15, wherein the information field for indicating an enhanced downlink control channel E-PDCCH configuration is set in a main information block MIB transmitted by a physical broadcast channel PBCH.

The method according to claim 14, wherein the preset E-PDCCH time domain resource range is: L1 L2 OFDM symbols in a subframe, where:

The L2 is a predetermined fixed value.

18. The method of claim 14, wherein the method further comprises:

The E-PDCCH for scheduling the system information block type 1 SIB1 scrambled by the system information radio network temporary identifier SI-RNTI is preset according to a preset time-frequency resource range in a preset subframe Search space allocates resources.

The method according to claim 14, wherein the preset E-PDCCH frequency domain resource range is: a pre-agreed M PRBs in a subframe, where M is a pre-agreed fixed value or is enhanced by The physical control format indicates the value indicated by the channel E-PCFICH.

20. The method according to claim 19, wherein the pre-agremed M PRBs have a set frequency domain interval.

The method according to claim 19, wherein the pre-agreed M PRBs are determined by a cell identifier from a low frequency starting from a low frequency, or determined by a virtual cell identifier, or by a cell identifier. The symbol and subframe number are determined, or determined by the virtual cell identifier and the subframe number.

The method according to claim 14, wherein the method further comprises:

In the E-PDCCH time-frequency resource range, the resource unit occupied by the common reference signal CRS is not used for E-PDCCH transmission, and the number of CRS ports is the same as the number of CRS ports used by the PBCH.

The method according to claim 14, wherein the method further comprises:

The resource unit occupied by the user-specific reference signal UERS is not used in the E-PDCCH time-frequency resource range.

The E-PDCCH is transmitted, and the number of ports of the UERS is the same as the number of UERS ports used by the E-PDCCH.

24. The method of claim 15, wherein the method further comprises:

Within the E-PDCCH time-frequency resource range, the channel state information reference signal CSI-RS maximum configuration set under zero power and non-zero power CSI-RS occupied resource unit is not used for E-PDCCH transmission.

The method according to claim 14, wherein the method further comprises:

The CSI-RS of zero power and non-zero power is not transmitted within the E-PDCCH time-frequency resource range.

26. An enhanced transmission device for a downlink control channel, comprising:

a determining unit, configured to determine, to receive an enhanced downlink control channel E-PDCCH;

The device according to claim 26, wherein the determining unit is specifically configured to:

The receiving E-PDCCH is determined according to the received information field for indicating the E-PDCCH configuration, where the information field is used to indicate that the E-PDCCH transmission mode of the user equipment is an legacy PDCCH-independent E-PDCCH transmission.

The device according to claim 26, wherein the receiving unit is further configured to:

The E-PDCCH for scheduling the system information block type 1 SIB1, which is scrambled by the system information radio network temporary identifier SI-RNTI, is received in a preset subframe.

Determining that the resource unit occupied by the user-specific reference signal UERS is not within the E-PDCCH time-frequency resource range Used for E-PDCCH transmission, and the number of UERS ports is the same as the number of UERS ports used by the E-PDCCH.

Determining, within the E-PDCCH time-frequency resource range, the channel state information reference signal CSI-RS maximum configuration set under zero power and non-zero power CSI-RS occupied resource unit is not used for E-PDCCH transmission.

Determining that the resource unit occupied by the CSI-RS does not exist in the E-PDCCH time-frequency resource range.

33. An enhanced transmission device for a downlink control channel, comprising:

And a sending unit, configured to send the E-PDCCH to the user equipment.

The device according to claim 33, wherein the sending unit is further configured to:

The device according to claim 33, wherein the resource allocation unit is further configured to:

The E-PDCCH for scheduling the system information block type 1 SIB1, which is scrambled by the system information radio network temporary identifier SI-RNTI, allocates time-frequency resources in a preset subframe.

37. The device according to claim 33, wherein the resource allocation unit is further configured to:

The resource unit occupied by the user-specific reference signal UERS is not used for E-PDCCH transmission, and the number of UERS ports is the same as the number of UERS ports used by the E-PDCCH.

A CSI-RS that does not transmit zero power and non-zero power within the E-PDCCH time-frequency resource range is determined.