WO2013007144A1

WO2013007144A1 - Method, device and system for transmitting and receiving data

Info

Publication number: WO2013007144A1
Application number: PCT/CN2012/077312
Authority: WO
Inventors: 张然然; 苏昕; 荆梅芳; 林亚男; 肖国军
Original assignee: 电信科学技术研究院
Priority date: 2011-07-08
Filing date: 2012-06-21
Publication date: 2013-01-17
Also published as: CN102256358A; CN102256358B

Abstract

Disclosed are a method, device and system for transmitting and receiving data, relating to communications technology.By dividing a resource block pair into at least two sub-resource block pairs, and allocating resources to an E-PDCCH domain taking a sub-resource block pair as a unit, each item of data is transmitted by one or more sub-resource block pairs according to the size of the data and the sub-resource block pairs, thus improving data transmission efficiency.

Description

Data transmission and reception method, device and system

This application claims priority to Chinese Patent Application No. 201110191199.7, entitled "A Data Transmission and Reception Method, Apparatus and System", filed on July 8, 2011, the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to communication technologies, and in particular, to a data transmission and reception method, apparatus, and system. Background technique

In a long term evolution (LTE) system, a physical downlink control channel (PDCCH) is transmitted in each radio subframe and formed with a physical downlink shared channel (PDSCH). The multiplexing relationship of time division multiplexing (TDM), 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 through the first N orthogonal frequency division multiplexing (OFDM) symbols of a downlink sub-frame, where the value of N can be 1, 2, 3 or 4, and N=4 is only allowed to appear. In systems with a system bandwidth of 1.4MHz.

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

The UE performs a PDCCH blind check in the control area to search whether there is a PDCCH for the PDCCH. The blind detection is specifically: using the radio network temporary identifier (RNTI) of the UE for different DCI formats and CCEs. The aggregation level is subjected to a decoding attempt, and if the decoding is correct, it is determined to be the DCI for the UE, and is received. In the LTE system, each downlink subframe of the UE in the discontinuous reception (DRX) state needs to perform blind detection on its control region to search for the PDCCH.

Multi-user multiple input multiple output (MU-MIMO), cooperative multiple points (CoMP), carrier aggregation and other technologies and wireless identification of the same cell identifier (ID) In the long term evolution-advanced (LTE-A) system, the capacity and transmission efficiency of the physical downlink shared channel are greatly improved in the introduction of the configuration of the remote radio head (RRH) and the eight antennas. Compared with the earlier LTE version (such as Release 8-9 (Rel-8/9)), the LTE-A system The performance of the physical downlink control channel has not improved.

On the one hand, in the LTE-A system, the application of the above new technology enables the PDSCH to simultaneously provide data transmission for more users, which will greatly increase the demand for the PDCCH channel capacity; on the other hand, the user-specific reference applied in the PDSCH New technologies such as user-specific reference signal (UTS) and relay-PDCCH (R-PDCCH) applied in relay backhaul provide the following techniques and experience for PDCCH enhancement.

In order to solve the limitation of the downlink control channel capacity and improve the transmission efficiency of the downlink control information, 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 transmission and reception technologies, and uses the original PDCCH resources to occupy the first N OFDM symbols. The possible values of N are 1, 2, 3, and 4. And N=4 is only allowed to appear in a system with a system bandwidth of 1.4 MHz. This part of the PDCCH domain is called the legacy PDCCH (Least PDCCH) domain, such as transmitting diversity when transmitting, and based on the cell-level reference signal when receiving (cell) -specific reference signal, CRS ) blind detection of DCI in public search space and user-specific search space using blind detection techniques.

The enhanced PDCCH domain can use more advanced transmission and reception technologies, such as precoding when transmitting, detecting based on UERS during reception, and transmitting time-frequency resources outside the legacy PDCCH domain, using some resources of the original PDSCH, and The PDSCH implements multiplexing by means of frequency division. This part of the PDCCH domain is called an enhanced PDCCH (E-PDCCH) domain. The scheme in which the Enhanced PDCCH and the PDSCH are multiplexed by the frequency division method is called frequency division multiplexing (FDM) E-PDCCH.

In the FDM E-PDCCH scheme, each piece of data in the Enhanced PDCCH region occupies at least one resource of a physical resource block pair (PRB pair). Taking DCI as an example, because on the one hand, each DCI contains fewer original bits, DCI format 1C (DCI format 1C) is generally a dozen bits, and a larger DCI format such as 2/2C does not exceed 60. On the other hand, the number of resources in each PRB pair is large, as shown in Table 1. Therefore, when DCI transmission is performed according to the existing FDM E-PDCCH scheme, the frequency efficiency is too low, resulting in waste of resources.

Table 1 Number of REs that each PRB pair can use for E-PDCCH transmission (regular prefix (CP))

Summary of the invention

Embodiments of the present invention provide a data transmission and reception method, apparatus, and system to improve data transmission efficiency. A data transmission method includes:

Dividing each resource block pair into at least two sub-resource block pairs according to a frequency domain;

Allocating resources by using a sub-resource block pair as a minimum resource allocation unit for each data in the E-PDCCH domain of the enhanced physical downlink control channel;

Transfer data on the allocated resources.

A data receiving method includes:

Determining a resource location of the data corresponding to the data receiving end, where the resource includes at least one sub-resource block pair, where the sub-resource block pair is specifically: after each resource block pair is divided into M shares, each sub-part is one sub- a resource block pair, said M ≥ 2; receiving said data on said resource.

A data transmission device includes:

a resource allocation unit, configured to divide each resource block pair into at least two sub-resource block pairs according to a frequency domain; and use a sub-resource block pair as a minimum resource allocation unit to allocate data in an E-PDCCH region of the enhanced physical downlink control channel Resource; a transport unit that is used to transfer data on allocated resources.

A data receiving device includes:

a determining unit, configured to determine a resource location of the data corresponding to the device, where the resource includes at least one sub-resource block pair, where the sub-resource block pair is specifically: each resource block pair is divided into M parts according to a frequency domain After that, each share is a sub-resource block pair, and the M≥2;

a receiving unit, configured to receive the data on the resource.

A data transmission system comprising:

a transmitting end, configured to divide each resource block pair into at least two sub-resource block pairs according to a frequency domain; use a sub-resource block pair as a minimum resource allocation unit, and allocate resources for each data in the enhanced physical downlink control channel E-PDCCH region ; transfer data on the allocated resources;

The receiving end is configured to determine a resource location of the corresponding data, and receive the data on the resource.

An embodiment of the present invention provides a data transmission and reception method, apparatus, and system, which are configured to divide a resource block pair into at least two sub-resource block pairs, and perform resource allocation of the E-PDCCH domain in units of sub-resource block pairs, according to the data. And the size of the sub-resource block pair, each data is transmitted by one or more sub-resource block pairs, thereby improving the data transmission efficiency. 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 a data transmission method according to an embodiment of the present invention;

4 is a schematic diagram of partitioning of sub-resource block pairs according to an embodiment of the present invention;

FIG. 5 is a flowchart of a data receiving method according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a data receiving apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention. detailed description

An embodiment of the present invention provides a data transmission and reception method, apparatus, and system, which are configured to divide a resource block pair into at least two sub-resource block pairs, and perform resource allocation of the E-PDCCH domain in units of sub-resource block pairs, according to the data. And the size of the sub-resource block pair, each data is transmitted by one or more sub-resource block pairs, thereby improving the data transmission efficiency.

An embodiment of the present invention provides a data transmission method. As shown in FIG. 3, the method includes:

Step S301: Divide each resource block pair into at least two sub-resource block pairs according to a frequency domain;

Step S302: The sub-resource block pair is a minimum resource allocation unit, and allocate resources for each data in the E-PDCCH domain of the enhanced physical downlink control channel;

That is, the sub-resource block pair is the minimum resource allocation unit, and allocates resources for each data in the E-PDCCH domain, where the sub-resource block pair is specifically: after each resource block pair is divided into M shares, each resource block pair is a sub-resource block pair, M>2;

Step S303: Transmitting data on the allocated resources.

As shown in FIG. 4, each PRB pair is divided into multiple sub-resource pairs (subRB pairs) according to the frequency domain. When resource allocation is performed, the subRB pair can be used as the smallest resource allocation unit, so that the transmission is short. In the case of data, the entire PRB pair is not required to implement the data transmission, and only one subRB pair is needed to implement the data transmission, and for longer data, multiple subRB pairs can also be used for transmission, due to the minimum resources. The allocation unit is smaller, so the resources occupied by the data are still reduced, and the data transmission efficiency is improved. In FIG. 4, the slash portion is Legacy PDCCH RE (original PDCCH resource unit), and the grid portion is UERS RE (user-specific reference) Signal resource unit).

For example, when the data is DCI, since the number of bits included in the DCI is small, when the subRB pair is used as the smallest resource allocation unit, DCI can be transmitted through fewer resources, thereby improving the transmission efficiency of the DCI.

In the embodiment of the present invention, the data is described as DCI, and the application can be replaced by other types of data for application by a person skilled in the art.

In this way, after a part of the subRB pair in one PRB pair is allocated to the DCI of one receiving end, the other subRB pair can also be allocated to the DCI of other users, or allocated to the PDSCH.

Similarly, after receiving the data, the receiving end needs to perform blind detection with the subRB pair as the minimum resource unit, thereby obtaining the corresponding DCI.

Of course, the sender may also allocate the resource to each data in the E-PDCCH domain by using the sub-resource block pair as the minimum resource allocation unit, and then notify the receiving end of the location information of the corresponding E-PDCCH resource, so that the receiving end is Root According to the received location information, the resource location of the data corresponding to the received location information is not blindly detected or the number of blind detections is reduced, thereby reducing the complexity of the processing at the receiving end.

For example, if the transmitting end allocates the resource, the sending sub-RB pair identifier of the data corresponding to each receiving end is directly sent to each receiving end, and each receiving end directly determines the resource corresponding to the data according to the subRB pair identifier. Location, no blind inspection is required. If the transmitting end allocates the resource, the PRB pair identifier of the data corresponding to each receiving end is sent to each receiving end, and each receiving end directly determines the PRB pair of the corresponding data according to the PRB pair identifier. A blind check can be performed within the PRB pair range.

When the PRB pair is divided, it can be divided according to the empirical value of the data size, or can be divided according to other rules. To facilitate the management of the subRB pair, each resource block pair can be equally divided into M shares according to the frequency domain.

Similar to the PDSCH domain, in the E-PDCCH domain, channel measurement can be performed by CSI-RS (channel state information reference signal) or CRS, and demodulation based on UERS or CRS, if necessary, solution based on UERS Tones, each subRB pair includes UERS RE, which facilitates the receiver to demodulate according to UERS.

Normally, in the case of a regular CP, each PRB pair includes 12 UERS REs, every 4 UERS

RE is on the same frequency, and determining M=3 ensures that each subRB pair includes 4 UERS REs;

In the case of CP, each PRB pair includes 16 UERS REs, and every 4 UERS REs are on the same frequency. Determine M=4 to ensure that each subRB pair includes 4 UERS REs, or determine M=2. It ensures that 8 UERS REs are included in each subRB pair.

When the channel measurement and demodulation are performed by the CRS in the E-PDCCH domain, since the UERS RE is not needed, when the PRB pair is divided, it is not necessary to consider the influence of the reference signal (refer to the signal), as long as the actual Need to determine the size of the subRB pair.

When performing precoding, the subRB pair may be precoded in a minimum unit, that is, the minimum unit of precoding granularity is subRB pair. For example, if only one subRB pair is allocated for the transmitted DCI, the pre-coded granularity of the transmitted data and UERS in the E-PDCCH is one subRB pair; if more than one subRB pair is allocated for the transmitted DCI, the E-PDCCH The pre-coded granularity of the transmitted data and the UERS may be one subRB pair or multiple subRB pairs, but no more than the number of allocated subRB pairs.

However, when performing demodulation based on UERS, in order to enable the receiving end to perform channel estimation by means of more UERS REs, the precoding granularity of the data signal in the E-PDCCH domain may be different from the precoding granularity of the UERS, for example, The minimum unit of precoding granularity of the data signal in the E-PDCCH domain is a sub-resource block pair, the minimum unit of the pre-coded granularity of the UERS RE is a resource block pair, and the UERS between different users in the same resource block pair is multi-user Input multi-output MU-MIMO mode for differentiation. For example, if a PRB pair contains three subPRB pairs, and each subPRB pair is assigned to one user's DCI transmission, the precoding of the DCI transmission in the PRB pair is performed. The granularity is 1 subRB pair, and the precoding granularity of the UERS in the PRB pair is 1 PRB pair. If the UERS of each user overlaps on the time-frequency resources, the MU-MIMO method is used for distinguishing.

The embodiment of the invention further provides a data receiving method. As shown in FIG. 5, the method includes:

Step S501: Determine a resource location of the data corresponding to the data receiving end, where the resource includes at least one sub-resource block pair, where the sub-resource block pair is specifically: after each resource block pair is divided into M parts according to the frequency domain , each resource block pair is a sub-resource block pair, M ≥ 2;

Step S502: Receive data on the determined resource.

In step S501, different resource arrangements are used to determine the resource location of the corresponding data, including the following three types:

Receiving location information of the corresponding E-PDCCH resource sent by the sending end, and determining a resource location of the corresponding data according to the location information; or

Determining the number of sub-resource block pairs of the corresponding data according to the number of known sub-resource block pairs included in the resource, or by assuming blind detection of the number of sub-resource block pairs included in the resource; or

Receiving location information of the corresponding E-PDCCH resource sent by the sending end, and determining, according to the location information, a range of resources of the corresponding data, according to the known number of sub-resource block pairs included in the resource, or assuming The number of sub-resource block pairs included in the resource is blindly detected in the range in which the resource is located, and the resource location of the corresponding data is determined.

Correspondingly, the embodiment of the present invention further provides a data transmission device, which may be specifically used as a transmitting end for transmitting data. As shown in FIG. 6, the device includes:

The resource allocation unit 601 is configured to divide each resource block pair into at least two sub-resource block pairs according to a frequency domain; the sub-resource block pair is a minimum resource allocation unit, and is an enhanced physical downlink control channel in the E-PDCCH domain. resource allocation;

The transmitting unit 602 is configured to transmit data on the allocated resources.

In order to facilitate the receiving end to obtain the location information of the corresponding E-PDCCH resource, and avoid the blind detection or reduce the blind detection range, the data transmission device further includes:

The notification unit notifies the receiving end of the location information of the corresponding E-PDCCH resource.

The embodiment of the present invention further provides a data receiving device, which may be specifically a receiving end for receiving data. As shown in FIG. 7, the device includes:

The determining unit 701 is configured to determine a resource location of the data corresponding to the device, where the resource includes at least one sub-resource block pair, where the sub-resource block pair is specifically: each resource block pair is divided into M according to a frequency domain. After the share, each resource block pair is a sub-resource block pair, M ≥ 2;

The receiving unit 702 is configured to receive data on the determined resource.

The determining unit 701 is specifically configured to: according to a preset sub-resource block-to-position determining manner of the corresponding data: Receiving location information of the corresponding E-PDCCH resource sent by the sending end, and determining a location of the sub-resource block pair of the corresponding data according to the location information; or

Determining the resource location of the corresponding data according to the number of known sub-resource block pairs included in the resource, or by assuming blind detection of the number of sub-resource block pairs included in the resource; or

Receiving location information of the corresponding E-PDCCH resource sent by the sending end, and determining, according to the location information, a range of the resource pair of the corresponding data, according to the known number of sub-resource block pairs included in the resource, or assuming The number of sub-resource block pairs included in the resource is blindly detected in the range in which the resource is located, and the resource location of the corresponding data is determined.

The embodiment of the invention further provides a data transmission system. As shown in FIG. 8, the system includes:

The transmitting end 801 is configured to divide each resource block pair into at least two sub-resource block pairs according to a frequency domain, and use a sub-resource block pair as a minimum resource allocation unit to allocate data in the E-PDCCH domain of the enhanced physical downlink control channel. Resource; transfer data on the allocated resources;

The receiving end 802 is configured to determine a resource location of the corresponding data, and receive data on the determined resource. An embodiment of the present invention provides a data transmission and reception method, apparatus, and system, which are configured to divide a resource block pair into at least two sub-resource block pairs, and perform resource allocation of the E-PDCCH domain in units of sub-resource block pairs, according to the data. And the size of the sub-resource block pair, each data is transmitted by one or more sub-resource block pairs, thereby improving the data transmission efficiency.

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

A data transmission method, comprising:

Transfer data on the allocated resources.

2. The method according to claim 1, wherein the data is specifically downlink control information DCI.

The method according to claim 1, wherein after the sub-resource block pair is the minimum resource allocation unit and the resources are allocated for each data in the E-PDCCH domain, the method further includes:

And notifying the data receiving end of the location information of the E-PDCCH resource corresponding to the data receiving end.

The method according to claim 1, wherein each resource block pair is divided into at least two sub-resource block pairs according to a frequency domain, specifically:

Each resource block pair is equally divided into at least two sub-resource block pairs according to the frequency domain.

5. The method according to claim 1, wherein when the E-PDCCH domain performs signal demodulation based on a user-specific reference signal UERS,

Each of the sub-resource block pairs includes a user-specific reference signal resource unit UERS RE.

The method according to claim 4 or 5, wherein, in the case of a conventional cyclic prefix CP, the number of the pair of sub-resource blocks is 3, and in the case of an extended CP, the number of pairs of the sub-resource blocks It is 4 or 2.

The method according to claim 5, wherein when the data is precoded, the data signal in the E-PDCCH domain is the same as the precoding granularity of the UERS, and the minimum unit is a sub-resource block pair; or when the data is pre-coded, the precoding granularity of the data signal in the E-PDCCH domain is different from the precoding granularity of the UERS, and precoding particles of the data signal in the E-PDCCH domain The minimum unit of degrees is a sub-resource block pair, the minimum unit of the pre-coded granularity of the UERS is a resource block pair, and the UERS between different users in the same resource block pair is distinguished by a multi-user multiple input multiple output MIMO-MIMO method. .

8. The method according to claim 4, wherein the E-PDCCH domain is based on a cell level reference signal

When the CRS performs signal demodulation, the minimum unit of precoding granularity of the data signal in the E-PDCCH domain is a sub-resource block pair.

9. A data receiving method, comprising:

10. The method according to claim 9, wherein the determining a resource location of the corresponding data, Body includes:

Receiving, by the sending end, location information of the corresponding enhanced physical downlink control channel E-PDCCH resource, and determining, according to the location information, a resource location of the corresponding data; or

Receiving location information of the corresponding E-PDCCH resource sent by the sending end, and determining, according to the location information, a range of resources of the corresponding data, according to the number of known sub-resource block pairs included in the resource, Or, assuming that the number of sub-resource block pairs included in the resource is blindly detected in a range in which the resource is located, determining a resource location of the corresponding data.

A data transmission device, comprising:

12. The device of claim 11, further comprising:

The notification unit is configured to notify the data receiving end of the location information of the corresponding E-PDCCH resource.

13. A data receiving device, comprising:

a receiving unit, configured to receive the data on the resource.

The device according to claim 13, wherein the determining unit is specifically configured to:

15. A data transmission system, comprising:

a transmitting end, configured to divide each resource block pair into at least two sub-resource block pairs according to a frequency domain; use a sub-resource block pair as a minimum resource allocation unit, and allocate resources for each data in the enhanced physical downlink control channel E-PDCCH region ; transfer data on the allocated resources; The receiving end is configured to determine a resource location of the corresponding data, and receive the data on the resource.