CN102711251B - Method and device for determining pilot frequency port - Google Patents

Abstract

The invention discloses a method and a device for determining a pilot frequency port, used for supporting multi-user transmission for an enhanced physical control channel based on an orthogonal user dedicated reference signal.. The method for determining the pilot frequency port disclosed by the invention comprises the following steps that: a network side determines pilot frequency port determination rules required to be adopted currently, wherein the pilot frequency port determination rules comprise correspondence between enhanced physical control channel resource and the pilot frequency port, and the same enhanced physical control channel resource corresponds to different pilot frequency ports under different pilot frequency port determining rules; and the pilot frequency port determining rule adopted at the network side comprises that the enhanced physical control channel resource is distributed for user equipment (UE) and the pilot frequency port is determined.

Description

Method and device for determining pilot frequency port

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a pilot port.

Background

The current centralized enhanced physical downlink control channel determines a pilot frequency port of the enhanced physical downlink control channel by adopting a mode of high-level signaling configuration and implicit correspondence of physical resources and a user dedicated reference signal port. However, the existing pilot port determination scheme can only support multi-user transmission based on different user-specific reference signal scrambling sequences, and reference signals of different users do not have orthogonality, so that channel estimation of the reference signals is affected, and performance of the multi-user transmission is affected.

A detailed description of the prior art is given below.

Due to the introduction of technologies such as multi-user multiple input multiple output (MU-MIMO), coordinated multiple point (CoMP), carrier aggregation and the like, and configurations such as 8 antennas, the capacity and transmission efficiency of a physical downlink shared channel of a long term evolution-enhanced (LTE-a) system are greatly improved; in contrast to the earlier LTE release (e.g., Rel-8/9), the physical downlink control channel of the LTE-a system is not improved by the benefit of the new technology.

On one hand, the application of the new technology enables a Physical Downlink Shared Channel (PDSCH) to provide data transmission for more users at the same time, which greatly improves the requirement on the channel capacity of a Physical Downlink Control Channel (PDCCH); on the other hand, new technologies such as a user-specific reference signal (UERS) applied to a Physical Downlink Shared Channel (PDSCH) and a Relay-physical downlink control channel (Relay-PDCCH) applied to a Relay backhaul (Relay backhaul) provide a technique and experience that can be followed for PDCCH enhancement.

In order to solve the problem of limited downlink control channel capacity and improve the transmission efficiency of downlink control information, one solution is: and reserving the original PDCCH region and simultaneously transmitting the enhanced PDCCH in the PDSCH region in the downlink subframe. The original PDCCH region still uses the existing transmission and reception technology, uses the original PDCCH resource, for example, transmit diversity is used during transmission, and blind detection is performed on Downlink Control Information (DCI) in a common search space and a user-specific search space by using a blind detection technology based on a Common Reference Signal (CRS) during reception, using a Control Channel Element (CCE) as a unit, and the first N OFDM symbols are occupied for transmission, where N is possibly 1,2,3,4, and N =4 is only allowed to appear in a system with a system bandwidth of 1.4MHz, and this part of PDCCH region is called an original physical downlink control channel (legacy PDCCH). The enhanced PDCCH region may use a more advanced transmission and reception technique, for example, precoding is adopted during transmission, detection is performed based on UERS during reception, time-frequency resources other than the legacy PDCCH region are occupied for transmission, partial resources of the original PDSCH are used, and multiplexing is achieved with the PDSCH in a frequency division manner, and the partial PDCCH region is called an enhanced PDCCH (E-PDCCH) region. Referring to fig. 1, a schematic diagram of an E-PDCCH structure is shown.

The E-PDCCH supports two transmission modes of a centralized transmission mode and a distributed transmission mode. When the channel changes slowly and reliable Channel State Information (CSI) can be obtained, a centralized transmission method may be used. For example, a better frequency domain position is selected according to a fed-back sub-band Channel Quality Indicator (CQI) to perform corresponding E-PDCCH transmission, and the corresponding E-PDCCH is performed with closed-loop Precoding transmission based on UERS according to a fed-back Precoding Matrix Indicator (PMI) or spatial channel information obtained by using channel reciprocity. When the channel changes rapidly or reliable CSI is not available, a decentralized transmission scheme may be used to obtain frequency domain diversity gain. For example, the resources scattered in the frequency domain are selected to perform corresponding E-PDCCH transmission, and open-loop precoding or transmit diversity mode transmission is performed based on the E-PDCCH corresponding to the UERS.

In general, on one hand, each piece of DCI contains a small number of original bits (dcifomat 1C is typically tens of bits, and larger DCI formats, such as 2/2C, typically do not exceed 60 bits). On the other hand, the number of resources per physical resource block pair (PRB pair) is large, as shown in table 1. For centralized E-PDCCH transmission, one E-PDCCH is not enough to occupy the whole PRB pair, and for distributed E-PDCCH transmission, one E-PDCCH uses the resources in a plurality of PRB pairs with different frequency domain positions, and is not enough to occupy the whole PRB pair in each used PRB pair. In order to improve the spectrum utilization rate, the resource of one PRB pair is divided into several parts, for example, each part is defined as an Enhanced control channel element (E-CCE), and the E-CCE is used instead of the PRB pair as a resource allocation element of the E-PDCCH.

Table 1 number of normal cyclic prefixes (REs) per PRB pair that can be used for E-PDCCH transmission:

after the physical resource used by the E-PDCCH is determined, a UERS port used by the E-PDCCH must be determined to realize the transmission of the E-PDCCH. At present, it has been determined that at least a centralized enhanced physical downlink control channel determines a pilot port of the enhanced physical downlink control channel by using a high-level signaling configuration and an implicit corresponding manner of physical resources and UERS ports. For example, for an E-PDCCH for distributed transmission, one PRB pair is divided into 8 enhanced resource element groups (eregs), each eREG corresponds to one of 4 UERS ports, each 2 eregs form one E-CCE, and a user determines a corresponding UERS port according to an eREG number where the corresponding resource is located and a corresponding relationship between the eREG and an antenna port during blind detection, as shown in fig. 2.

For the E-PDCCH for centralized transmission, one PRB pair is divided into 8 enhanced resource element groups (eregs), each 2 eregs form one E-CCE, each E-PDCCH occupies a plurality of E-CCEs in one PRB pair, each E-PDCCH corresponds to one UERS port, the correspondence between the E-PDCCH and the UERS port is determined by a unique rule, and a user determines a corresponding UERS port according to the corresponding resource of the E-PDCCH and the correspondence between the E-PDCCH and the antenna port during blind detection, as shown in fig. 3.

The E-PDCCH can use UERS ports 7-10, the UERS ports 7 and 8 and the UERS ports 9 and 10 realize orthogonality by adopting a Code Division Multiplexing (CDM) mode, and different frequency domain resources are adopted between the UERS ports 7 and 8 and the UERS ports 9 and 10 to realize orthogonality. As can be seen from fig. 3, under the correspondence relationship between the E-PDCCH and the UERS ports, a specific resource of one PRB pair only corresponds to a unique UERS port, so that if two different E-PDCCHs use the same time-frequency resource, the same UERS port is inevitably used, and there is no case where the specific resource corresponds to multiple UERS ports. The channels from the transmission point to multiple users can be distinguished only by different URRS scrambling sequences, and since the reference signals of different users based on different scrambling sequences do not have orthogonality, the channel estimation of the reference signals is affected, and the performance of multi-user transmission is affected.

In summary, the existing pilot port determination scheme in the prior art can only support multi-user transmission based on different user-specific reference signal scrambling sequences, and reference signals of different users do not have orthogonality, so that channel estimation of the reference signals is affected, and performance of the multi-user transmission is affected.

Disclosure of Invention

The embodiment of the invention provides a method and a device for determining a pilot frequency port, which are used for supporting multi-user transmission of an enhanced physical control channel based on an orthogonal user dedicated reference signal.

The method for determining the pilot frequency port provided by the embodiment of the invention comprises the following steps:

a network side determines a pilot frequency port determination rule which needs to be adopted currently, wherein the pilot frequency port determination rule comprises a corresponding relation between an enhanced physical control channel resource and a pilot frequency port, and the pilot frequency ports corresponding to the same enhanced physical control channel resource under different pilot frequency port determination rules are different;

and the network side adopts the pilot frequency port determination rule to allocate enhanced physical control channel resources to the user equipment UE and determines a pilot frequency port.

The method for receiving downlink control information provided by the embodiment of the invention comprises the following steps:

the method comprises the steps that User Equipment (UE) determines a pilot frequency port determination rule adopted by a network side for the UE, wherein the pilot frequency port determination rule comprises a corresponding relation between enhanced physical control channel resources and pilot frequency ports, and the pilot frequency ports corresponding to the same enhanced physical control channel resources under different pilot frequency port determination rules are different;

and the UE performs blind detection on the enhanced physical control channel according to the determined pilot frequency port determination rule to realize the reception of the downlink control information.

The device for determining a pilot frequency port provided by the embodiment of the invention comprises:

a rule determining unit, configured to determine a pilot port determination rule that needs to be currently used, where the pilot port determination rule includes a correspondence between an enhanced physical control channel resource and a pilot port, and pilot ports corresponding to the same enhanced physical control channel resource under different pilot port determination rules are different;

and the port determining unit is used for allocating the enhanced physical control channel resources to the user equipment UE by adopting the pilot port determining rule and determining the pilot port.

The receiving apparatus for downlink control information provided in the embodiments of the present invention includes:

the method comprises the steps that User Equipment (UE) determines a pilot frequency port determination rule adopted by a network side for the UE, wherein the pilot frequency port determination rule comprises a corresponding relation between enhanced physical control channel resources and pilot frequency ports, and the pilot frequency ports corresponding to the same enhanced physical control channel resources under different pilot frequency port determination rules are different;

and the UE performs blind detection on the enhanced physical control channel according to the determined pilot frequency port determination rule to realize the reception of the downlink control information.

In the embodiment of the invention, a pilot frequency port determination rule which needs to be adopted currently is determined through a network side, wherein the pilot frequency port determination rule comprises a corresponding relation between an enhanced physical control channel resource and a pilot frequency port, and the pilot frequency ports corresponding to the same enhanced physical control channel resource under different pilot frequency port determination rules are different; in the implementation, the same E-PDCCH time-frequency resources are distributed to two pieces of UE suitable for MU-MIMO pairing on a network side, one level of pilot frequency port determination rule is adopted to determine a UERS port used by the E-PDCCH corresponding to one piece of UE, the other level of pilot frequency port determination rule is adopted to determine a UERS port used by the E-PDCCH corresponding to the other piece of UE and a determined pilot frequency port, and due to the fact that different ports of the UERS ports 7-10 are mutually orthogonal, multi-user transmission of an enhanced physical control channel based on orthogonal user dedicated reference signals can be supported.

Drawings

Fig. 1 is a diagram illustrating an enhanced PDCCH structure in the prior art;

fig. 2 is a schematic diagram illustrating a correspondence relationship between resources of a distributed E-PDCCH and UERS ports in the prior art;

fig. 3 is a schematic diagram illustrating a correspondence relationship between resources of a centralized E-PDCCH and UERS ports in the prior art;

fig. 4 is a flowchart illustrating a method for determining a pilot port on a network side according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating a method for receiving downlink control information on a UE side according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a correspondence relationship between an enhanced physical control channel resource and a pilot port according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a correspondence relationship between an enhanced physical control channel resource and a pilot port according to an embodiment of the present invention;

fig. 8 is a schematic diagram illustrating a correspondence relationship between an enhanced physical control channel resource and a pilot port according to an embodiment of the present invention;

FIG. 9 is a diagram illustrating possible resource allocation and port mapping results provided by an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a correspondence relationship between an enhanced physical control channel resource and a pilot port according to an embodiment of the present invention;

fig. 11 is a schematic diagram illustrating a correspondence relationship between an enhanced physical control channel resource and a pilot port according to an embodiment of the present invention;

fig. 12 is a schematic diagram illustrating a correspondence relationship between an enhanced physical control channel resource and a pilot port according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a device for determining a pilot port on a network side according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a device for receiving downlink control information on a UE side according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention provides a method and a device for determining a pilot frequency port, which are used for supporting multi-user transmission of an enhanced physical control channel based on an orthogonal user dedicated reference signal.

In the method for determining a pilot port of an enhanced physical control channel provided in the embodiments of the present invention, one or more levels of pilot port determination rules are predetermined on a network side and a UE side in advance, and corresponding pilot ports of the same enhanced physical control channel resource are different under different pilot port determination rules, that is, different pilot port determination rules correspond to different enhanced physical control channel resource search spaces (or referred to as enhanced physical control channel resource sets), for example, a pilot port determined by using a first level pilot port determination rule is different from a pilot port determined by using a second level pilot port determination rule.

The following provides a detailed description of the technical solutions provided by the embodiments of the present invention.

On the network side, referring to fig. 4, a method for determining a pilot port according to an embodiment of the present invention includes:

s101, a network side determines a pilot frequency port determination rule which needs to be adopted currently, wherein the pilot frequency port determination rule comprises a corresponding relation between an enhanced physical control channel resource and a pilot frequency port, and the pilot frequency ports corresponding to the same enhanced physical control channel resource under different pilot frequency port determination rules are different;

s102, the network side adopts the pilot frequency port determination rule to allocate enhanced physical control channel resources to the user equipment UE and determines the pilot frequency port.

Preferably, before the network side determines the pilot port determination rule that needs to be adopted currently, the method further includes:

the network side and the UE side agree with a plurality of levels of pilot port determination rules in advance, and the enhanced physical control channel resource search spaces corresponding to the pilot port determination rules of different levels are different.

Preferably, the secondary pilot port determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the enhanced physical control channel resource search space under the rule for the previous pilot port.

Preferably, before the network side determines the pilot port determination rule that needs to be adopted currently, the method further includes:

the network side informs the UE of the pilot port configuration parameters, wherein the pilot port configuration parameters are used for informing the UE that the network side determines the pilot port by adopting a first-level pilot port determination rule, or determines the pilot port by adopting the first-level pilot port determination rule or at least one other pilot port determination rule.

Preferably, the method further comprises:

and the network side sends downlink control information to the UE through the determined pilot frequency port on the allocated enhanced physical control channel resources.

Correspondingly, on the UE side, referring to fig. 5, a method for receiving downlink control information provided in the embodiment of the present invention includes:

s201, a User Equipment (UE) determines a pilot port determination rule adopted by a network side for the UE, wherein the pilot port determination rule comprises a corresponding relation between an enhanced physical control channel resource and a pilot port, and the pilot ports corresponding to the same enhanced physical control channel resource under different pilot port determination rules are different;

s202, the UE carries out blind detection of the enhanced physical control channel according to the determined pilot frequency port determination rule, and reception of downlink control information is achieved.

Preferably, before the UE determines that the network side determines the rule for determining the pilot port adopted by the UE, the method further includes:

the UE side and the network side agree with a plurality of levels of pilot port determination rules in advance, and the enhanced physical control channel resource search spaces corresponding to the pilot port determination rules of different levels are different.

Preferably, the secondary pilot port determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the enhanced physical control channel resource search space under the rule for the previous pilot port.

Preferably, the UE determining the pilot port determination rule adopted by the network side for the UE includes:

the UE receives a pilot port configuration parameter notified by a network side, wherein the pilot port configuration parameter is used for notifying the UE network side to determine a pilot port by adopting a first-level pilot port determination rule, or to determine the pilot port by adopting the first-level pilot port determination rule or at least one other pilot port determination rule;

and the UE determines a pilot port determination rule adopted by the UE for the network side through the pilot port configuration parameters.

Preferably, the UE performs blind detection of the enhanced physical control channel according to the determined pilot port determination rule, so as to receive downlink control information, including:

UE firstly determines a rule according to a first-stage pilot frequency port, performs blind detection on an enhanced physical control channel in a first enhanced physical control channel resource search space or a first enhanced physical control channel resource search space subset corresponding to the first-stage pilot frequency port determination rule, and if all downlink control information is successfully received, ends the blind detection; otherwise, according to the secondary pilot frequency port determination rule, blind detection of the enhanced physical control channel is carried out in the enhanced physical control channel resource search space corresponding to the secondary pilot frequency port determination rule until all downlink control information is successfully received or blind detection of all enhanced physical control channel resource search spaces is completed.

Two specific examples are given below.

Example 1:

in a PRB pair only with a centralized transmission mode, resources in one PRB pair are divided into 4 different parts, each part is defined as an enhanced control resource unit (E-CCE), the parts are numbered sequentially in one PRB pair and are respectively E-CCE1, E-CCE 2, E-CCE 3 and E-CCE 4, two-level pilot port determination rules and corresponding search spaces are agreed on a network side and a UE side in advance, and the two-level pilot port determination rules are respectively a first-level pilot port determination rule and a second-level pilot port determination rule.

First-level pilot port determination rule:

the enhanced physical control channel resources of the E-PDCCH occupying 1 CCE in the current PRB pair are as follows: { E-CCE1, E-CCE 2, E-CCE 3, and E-CCE 4}, where the mapping relationship between the enhanced physical control channel resources and the pilot ports is:wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource of the E-PDCCH occupying 1 CCE in the current PRB pair under the first-level pilot port determination rule, n_E-CCEE-CCE numbers are represented as shown in fig. 6, i.e., E-CCE1 corresponds to UERS port 7 (i.e., port 7 in the figure), E-CCE 2 corresponds to UERS port8 (i.e., port8 in the figure), E-CCE 3 corresponds to UERS port9 (i.e., port9 in the figure), and E-CCE 4 corresponds to UERS port 10 (i.e., port 10 in the figure).

The enhanced physical control channel resources of the E-PDCCH occupying 2 CCEs in the current PRB pair are as follows: { E-CCE1 and E-CCE 2, E-CCE 3 and E-CCE 4}, where the corresponding relationship between the enhanced physical control channel resources and the pilot port is:wherein,representing E-PDCCH occupying 2 CCEs in the current PRB pair under the first-level pilot port determination ruleThe pilot port numbers corresponding to the enhanced physical control channel resources are as shown in fig. 7, that is, E-CCE1 and E-CCE 2 correspond to UERS port 7, and E-CCE 3 and E-CCE 4 correspond to UERS port 9.

The enhanced physical control channel resources of the E-PDCCH occupying 4 CCEs in the current PRB pair are as follows: { E-CCE1 and E-CCE 2, and E-CCE 3 and E-CCE 4}, where the resource-port correspondence is: indicating that the first-level pilot port determination rule is that the pilot port numbers corresponding to the enhanced physical control channel resources of the E-PDCCH occupying 4 CCEs within the current PRB pair, that is, the E-CCE1 and the E-CCE 2, and the E-CCE 3 and the E-CCE 4 correspond to the UERS port 7, as shown in fig. 8.

To sum up, when the resource allocation within one PRB pair is completed based on only the first-level pilot port determination rule, as shown in fig. 9, all possible mapping relationships between the resource allocation of the enhanced physical control channel and the pilot port include 5 cases, which are case 1, case 2, case 3, case 4, and case 5 in fig. 9, respectively.

Second-stage pilot port determination rule (i.e., secondary pilot port determination rule):

the enhanced physical control channel resources of the E-PDCCH occupying 1 CCE in the current PRB pair are as follows: { E-CCE1, E-CCE 2, E-CCE 3, and E-CCE 4}, where the mapping relationship between the enhanced physical control channel resources and the pilot ports is:wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource of the E-PDCCH occupying 1 CCE in the current PRB pair under the second-level pilot port determination rule, n_E-CCEE-CCE numbers are indicated as shown in fig. 10, i.e. E-CCE1 corresponds to UERS port 10, E-CCE 2 corresponds to UERS port 10, E-CCE 3 corresponds to UERS port8, and E-CCE 4 corresponds to UERS port 8.

The enhanced physical control channel resources of the E-PDCCH occupying 2 CCEs in the current PRB pair are as follows: { E-CCE1 and E-CCE 2, E-CCE 3 and E-CCE 4}, where the corresponding relationship between the enhanced physical control channel resources and the pilot port is:whereinIndicating the port number corresponding to the enhanced physical control channel resource of the E-PDCCH occupying 2 CCEs in the current PRB pair under the second-level pilot frequency port determination rule, n_E-CCEE-CCE numbers are indicated as shown in fig. 11, i.e. E-CCE1 and E-CCE 2 correspond to UERS port8 and E-CCE 3 and E-CCE 4 correspond to UERS port 10.

The enhanced physical control channel resources of the E-PDCCH occupying 4 CCEs in the current PRB pair are as follows: { E-CCE1 and E-CCE 2, and E-CCE 3 and E-CCE 4}, where the corresponding relationship between the enhanced physical control channel resources and the pilot port is:wherein,the pilot port number corresponding to the enhanced physical control channel resource of the E-PDCCH occupying 4 CCEs in the current PRB pair under the second-level pilot port determination rule is shown in fig. 12, that is, E-CCE1 and E-CCE 2, and E-CCE 3 and E-CCE 4 correspond to UERS port 9.

In a specific implementation, a network side determines whether dynamic switching between single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO) is required for E-PDCCH transmission of a UE according to a location and a channel condition of the UE. Generally, a UE in the center of an adjacent cell, which has a better channel condition and more reliable Channel State Information (CSI) feedback, can obtain more gain by supporting the dynamic switching of SU-MIMO/MU-MIMO, and is suitable for supporting the dynamic switching of SU-MIMO/MU-MIMO. If the dynamic switching of SU-MIMO/MU-MIMO needs to be supported, the pilot port configuration parameter indication sent by the network side to the UE is to determine the pilot port according to the multi-level pilot port determination rule, and if only SU-MIMO transmission needs to be supported, the pilot port configuration parameter indication sent by the network side to the UE is to determine the pilot port according to the first-level pilot port determination rule.

In actual transmission, if the E-PDCCHs transmitted to two UEs are scheduled to perform MU-MIMO transmission on the same physical resource, the E-PDCCH corresponding to one UE determines a pilot port using a first-stage pilot port determination rule, and the E-PDCCH corresponding to the other UE determines a pilot port using a second-stage pilot port determination rule.

To sum up, in embodiment 1, when the pilot port configuration parameter sent by the network side to the UE indicates that the pilot port is determined according to the multi-level pilot port determination rule, the maximum blind detection times of the UE side are increased by 1 time compared to when the pilot port configuration parameter indicates that the pilot port is determined according to the first-level pilot port determination rule.

Example 2:

in a PRB pair only with a centralized transmission mode, resources in one PRB pair are divided into 4 different parts, each part is defined as an enhanced control resource unit (E-CCE), the parts are numbered sequentially in one PRB pair and are respectively E-CCE1, E-CCE 2, E-CCE 3 and E-CCE 4, two-level pilot port determination rules and corresponding search spaces are agreed on a network side and a UE side in advance, and the two-level pilot port determination rules are respectively a first-level pilot port determination rule and a second-level pilot port determination rule.

First-level pilot port determination rule:

enhanced physics for E-PDCCH occupying 1 CCE within the current PRB pairThe control channel resources are: { E-CCE1, E-CCE 2, E-CCE 3, and E-CCE 4}, where the mapping relationship between the enhanced physical control channel resources and the pilot ports is:wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource of the E-PDCCH occupying 1 CCE in the current PRB pair under the first-level pilot port determination rule, n_E-CCEE-CCE numbers are represented as shown in fig. 6, i.e., E-CCE1 corresponds to UERS port 7 (i.e., port 7 in the figure), E-CCE 2 corresponds to UERS port8 (i.e., port8 in the figure), E-CCE 3 corresponds to UERS port9 (i.e., port9 in the figure), and E-CCE 4 corresponds to UERS port 10 (i.e., port 10 in the figure).

The enhanced physical control channel resources of the E-PDCCH occupying 2 CCEs in the current PRB pair are as follows: { E-CCE1 and E-CCE 2, E-CCE 3 and E-CCE 4}, where the corresponding relationship between the enhanced physical control channel resources and the pilot port is:wherein,the pilot port number corresponding to the enhanced physical control channel resource of the E-PDCCH occupying 2 CCEs in the current PRB pair under the first-level pilot port determination rule is shown in fig. 7, that is, E-CCE1 and E-CCE 2 correspond to UERS port 7, and E-CCE 3 and E-CCE 4 correspond to UERS port 9.

The enhanced physical control channel resources of the E-PDCCH occupying 4 CCEs in the current PRB pair are as follows: { E-CCE1 and E-CCE 2, and E-CCE 3 and E-CCE 4}, where the resource-port correspondence is: indicating that the first-level pilot port determination rule is that the pilot port numbers corresponding to the enhanced physical control channel resources of the E-PDCCH occupying 4 CCEs within the current PRB pair, that is, the E-CCE1 and the E-CCE 2, and the E-CCE 3 and the E-CCE 4 correspond to the UERS port 7, as shown in fig. 8.

To sum up, when the resource allocation within one PRB pair is completed based on only the first-level pilot port determination rule, as shown in fig. 9, all possible mapping relationships between the resource allocation of the enhanced physical control channel and the pilot port include 5 cases, which are case 1, case 2, case 3, case 4, and case 5 in fig. 9, respectively.

Second-stage pilot port determination rule (i.e., secondary pilot port determination rule):

the enhanced physical control channel resources of the E-PDCCH occupying 1 CCE in the current PRB pair are as follows: { E-CCE1, E-CCE 2, E-CCE 3, and E-CCE 4}, where the mapping relationship between the enhanced physical control channel resources and the pilot ports is:wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource of the E-PDCCH occupying 1 CCE in the current PRB pair under the second-level pilot port determination rule, n_E-CCEE-CCE numbers are indicated as shown in fig. 10, i.e. E-CCE1 corresponds to UERS port 10, E-CCE 2 corresponds to UERS port 10, E-CCE 3 corresponds to UERS port8, and E-CCE 4 corresponds to UERS port 8.

In summary, in embodiment 2, when the pilot port configuration parameter sent by the network side indicates that the pilot port is determined according to the multi-level pilot port determination rule, the maximum blind detection number of the UE side is increased by 1/7 times compared with when the pilot port configuration parameter indicates that the pilot port is determined according to one pilot port determination rule.

An explanation is given below of the apparatus provided in the embodiment of the present invention.

On the network side, referring to fig. 13, an apparatus for determining a pilot port according to an embodiment of the present invention includes:

a rule determining unit 11, configured to determine a pilot port determination rule that needs to be currently used, where the pilot port determination rule includes a correspondence between an enhanced physical control channel resource and a pilot port, and pilot ports corresponding to the same enhanced physical control channel resource under different pilot port determination rules are different;

a port determining unit 12, configured to allocate an enhanced physical control channel resource to the user equipment UE by using the pilot port determining rule, and determine a pilot port.

Preferably, the apparatus further comprises:

a stipulating unit 13, configured to stipulate pilot port determination rules of multiple levels in advance between the network side and the UE side before the rule determining unit 11 determines the pilot port determination rule that needs to be currently used, where the enhanced physical control channel resource search spaces corresponding to the pilot port determination rules of different levels are different.

Preferably, the secondary pilot port agreed by the agreement unit 13 determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the enhanced physical control channel resource search space under the rule for the previous-stage pilot port.

Preferably, the apparatus further comprises:

a parameter notifying unit 14, configured to notify the UE of a pilot port configuration parameter before the rule determining unit 11 determines the pilot port determination rule that needs to be currently used, where the pilot port configuration parameter is used to notify the UE of determining the pilot port by using the first-level pilot port determination rule on the network side, or determine the pilot port by using the first-level pilot port determination rule or at least one other pilot port determination rule.

Preferably, the apparatus further comprises:

a downlink control information sending unit 15, configured to send downlink control information to the UE through the pilot port determined by the port determining unit 12 on the enhanced physical control channel resource allocated by the port determining unit 12.

Preferably, the apparatus for determining a pilot port provided in the embodiment of the present invention is a base station.

Referring to fig. 14, a device for receiving downlink control information according to an embodiment of the present invention includes:

a rule determining unit 21, configured to determine a pilot port determination rule that is used by a network side for a user equipment UE, where the pilot port determination rule includes a correspondence between an enhanced physical control channel resource and a pilot port, and pilot ports corresponding to the same enhanced physical control channel resource under different pilot port determination rules are different;

and the blind detection unit 22 is configured to perform blind detection on the enhanced physical control channel according to the determined pilot port determination rule, so as to receive downlink control information.

Preferably, the apparatus further comprises:

a stipulating unit 23, configured to stipulate pilot port determination rules of multiple levels in advance between the UE side and the network side before the rule determining unit 21 determines that the network side determines the pilot port determination rule adopted for the UE, where the enhanced physical control channel resource search spaces corresponding to the pilot port determination rules of different levels are different.

Preferably, the secondary pilot port agreed by the agreement unit 23 determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the enhanced physical control channel resource search space under the rule for the previous-stage pilot port.

Preferably, the apparatus further comprises:

a parameter receiving unit 24, configured to receive a pilot port configuration parameter notified by a network side, where the pilot port configuration parameter is used to notify the UE network side to determine a pilot port by using a first-level pilot port determination rule, or to determine a pilot port by using a first-level pilot port determination rule or at least one other pilot port determination rule;

the rule determining unit 21 determines, according to the pilot port configuration parameter, a pilot port determination rule that the network side adopts for the UE.

Preferably, the blind detection unit 22 is specifically configured to:

firstly, according to a first-stage pilot port determination rule, performing blind detection on an enhanced physical control channel in a first enhanced physical control channel resource search space or a first enhanced physical control channel resource search space subset corresponding to the first-stage pilot port determination rule, and if all downlink control information is successfully received, finishing the blind detection; otherwise, according to the secondary pilot frequency port determination rule, blind detection of the enhanced physical control channel is carried out in the enhanced physical control channel resource search space corresponding to the secondary pilot frequency port determination rule until all downlink control information is successfully received or blind detection of all enhanced physical control channel resource search spaces is completed.

Preferably, the apparatus for receiving downlink control information provided in the embodiment of the present invention is a UE.

In summary, in the transmission scheme for enhancing the physical control channel provided in the embodiments of the present invention, the network side may notify the UE of the configuration parameters of the pilot port, where the parameters are used to notify the UE to determine the pilot port only according to the first-level pilot port determination rule or according to the multi-level pilot port determination rule. Specifically, the pilot is UERS. And when the pilot port configuration parameters indicate that the pilot port is determined according to the multistage pilot port determination rule, the network side allocates the enhanced physical control channel resources to the UE according to the multistage pilot port determination rule and determines the pilot port. When the pilot port configuration parameter indicates that the pilot port is determined according to a pilot port determination rule, the network side allocates the enhanced physical control channel resource to the UE according to the first-level pilot port determination rule and determines the pilot port. Further, the network side sends downlink control information to the UE on the allocated enhanced physical control channel resources based on the determined pilot port. Correspondingly, at the UE side, the UE receives a pilot port configuration parameter, where the parameter is used to inform the UE to determine the pilot port only according to the first-level pilot port determination rule or according to the multi-level pilot port determination rule. Specifically, the pilot is UERS. When the pilot frequency port configuration parameter indicates that the pilot frequency port is determined according to the multi-level pilot frequency port determination rule, the UE performs blind detection of the enhanced physical control channel according to the multi-level pilot frequency port determination rule, so as to receive downlink control information. Specifically, the UE first performs blind detection in a first enhanced physical control channel resource search space or a first enhanced physical control channel resource search space subset according to a first pilot port determination rule, and if all possible downlink control information is successfully received, ends the blind detection; otherwise, blind detection is carried out in the enhanced physical control channel resource search space corresponding to the second-level pilot port determination rule according to the second-level pilot port determination rule until all possible downlink control information is successfully received or blind detection of all search spaces is completed. When the pilot port configuration parameter indicates that the pilot port is determined according to a pilot port determination rule, the UE performs blind detection of the enhanced physical control channel according to the first-level pilot port determination rule, so as to receive downlink control information. Therefore, the embodiment of the invention can support the multi-user transmission of the enhanced physical control channel based on the exclusive reference signal of the orthogonal user.

As will be appreciated by one skilled in the art, embodiments of the present invention may 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 an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (20)

1. A method for determining a pilot port, the method comprising:

a network side determines a pilot frequency port determination rule which needs to be adopted currently, wherein the pilot frequency port determination rule comprises a corresponding relation between an enhanced physical control channel resource and a pilot frequency port, and the pilot frequency ports corresponding to the same enhanced physical control channel resource under different pilot frequency port determination rules are different;

the network side adopts the pilot frequency port determination rule to allocate enhanced physical control channel resources to the user equipment UE and determines a pilot frequency port;

the pilot port determination rule comprises a two-stage pilot port determination rule, wherein the two-stage pilot port determination rule is a first-stage pilot port determination rule and a second-stage pilot port determination rule respectively;

the first-stage pilot port determination rule for enhancing the corresponding relationship between the physical control channel resources and the pilot ports includes:

when the first-stage pilot port occupies an enhanced physical downlink control channel resource of a control resource element (CCE) in a physical resource block pair PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is as follows:

$n_{\mathrm{port}}^{\mathrm{1,1}}=n_{E-\mathrm{CCE}}+6,$

wherein,indicating a pilot port number corresponding to an enhanced physical downlink control channel resource occupying a CCE in the current PRB pair under the first-level pilot port determination rule, n_E-CCERepresents an E-CCE number;

the secondary pilot port determination rule for enhancing the corresponding relationship between the physical control channel resources and the pilot ports includes:

when the secondary pilot port occupies an enhanced physical downlink control channel resource of a CCE within a PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is:

wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource occupying a CCE in the current PRB pair under the secondary pilot port determination rule, n_E-CCEIndicating the E-CCE number.

2. The method of claim 1, wherein before the network side determines the pilot port determination rule that needs to be adopted currently, the method further comprises:

the network side and the UE side agree with a plurality of levels of pilot port determination rules in advance, and the enhanced physical control channel resource search spaces corresponding to the pilot port determination rules of different levels are different.

3. The method of claim 2, wherein the secondary pilot port determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the search space of the enhanced physical control channel resource under the rule for the pre-stage pilot port.

4. The method of claim 1, wherein before the network side determines the pilot port determination rule that needs to be adopted currently, the method further comprises:

the network side informs the UE of the pilot port configuration parameters, wherein the pilot port configuration parameters are used for informing the UE that the network side determines the pilot port by adopting a first-level pilot port determination rule, or determines the pilot port by adopting the first-level pilot port determination rule or at least one other pilot port determination rule.

5. The method according to any one of claims 1-4, further comprising:

and the network side sends downlink control information to the UE through the determined pilot frequency port on the allocated enhanced physical control channel resources.

6. A method for receiving downlink control information, the method comprising:

the method comprises the steps that User Equipment (UE) determines a pilot frequency port determination rule adopted by a network side for the UE, wherein the pilot frequency port determination rule comprises a corresponding relation between enhanced physical control channel resources and pilot frequency ports, and the pilot frequency ports corresponding to the same enhanced physical control channel resources under different pilot frequency port determination rules are different;

the UE performs blind detection of an enhanced physical control channel according to a determined pilot frequency port determination rule to realize receiving of downlink control information;

the pilot port determination rule comprises a two-stage pilot port determination rule, wherein the two-stage pilot port determination rule is a first-stage pilot port determination rule and a second-stage pilot port determination rule respectively;

the first-stage pilot port determination rule for enhancing the corresponding relationship between the physical control channel resources and the pilot ports includes:

when the first-stage pilot port occupies an enhanced physical downlink control channel resource of a CCE within a PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is:

$n_{\mathrm{port}}^{\mathrm{1,1}}=n_{E-\mathrm{CCE}}+6,$

wherein,indicating a pilot port number corresponding to an enhanced physical downlink control channel resource occupying a CCE in the current PRB pair under the first-level pilot port determination rule, n_E-CCERepresents an E-CCE number;

the secondary pilot port determination rule for enhancing the corresponding relationship between the physical control channel resources and the pilot ports includes:

when the secondary pilot port occupies an enhanced physical downlink control channel resource of a CCE within a PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is:

wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource occupying a CCE in the current PRB pair under the secondary pilot port determination rule, n_E-CCEIndicating the E-CCE number.

7. The method of claim 6, wherein before the UE determines the rule for determining the pilot port adopted by the UE by the network side, the method further comprises:

the UE side and the network side agree with a plurality of levels of pilot port determination rules in advance, and the enhanced physical control channel resource search spaces corresponding to the pilot port determination rules of different levels are different.

8. The method of claim 7, wherein the secondary pilot port determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the search space of the enhanced physical control channel resource under the rule for the pre-stage pilot port.

9. The method of claim 6, wherein the UE determining the pilot port determination rule adopted by the network side for the UE comprises:

the UE receives a pilot port configuration parameter notified by a network side, wherein the pilot port configuration parameter is used for notifying the UE network side to determine a pilot port by adopting a first-level pilot port determination rule, or to determine the pilot port by adopting the first-level pilot port determination rule or at least one other pilot port determination rule;

and the UE determines a pilot port determination rule adopted by the UE for the network side through the pilot port configuration parameters.

10. The method according to any one of claims 6 to 9, wherein the UE performs blind detection of the enhanced physical control channel according to the determined pilot port determination rule to implement reception of the downlink control information, including:

UE firstly determines a rule according to a first-stage pilot frequency port, performs blind detection on an enhanced physical control channel in a first enhanced physical control channel resource search space or a first enhanced physical control channel resource search space subset corresponding to the first-stage pilot frequency port determination rule, and if all downlink control information is successfully received, ends the blind detection; otherwise, according to the secondary pilot frequency port determination rule, blind detection of the enhanced physical control channel is carried out in the enhanced physical control channel resource search space corresponding to the secondary pilot frequency port determination rule until all downlink control information is successfully received or blind detection of all enhanced physical control channel resource search spaces is completed.

11. An apparatus for determining a pilot port, the apparatus comprising:

a rule determining unit, configured to determine a pilot port determination rule that needs to be currently used, where the pilot port determination rule includes a correspondence between an enhanced physical control channel resource and a pilot port, and pilot ports corresponding to the same enhanced physical control channel resource under different pilot port determination rules are different;

a port determining unit, configured to allocate an enhanced physical control channel resource to the UE by using the pilot port determining rule and determine a pilot port;

the rule determining unit determines the pilot frequency port determining rule which needs to be adopted currently, wherein the pilot frequency port determining rule comprises two levels of pilot frequency port determining rules, and the two levels of pilot frequency port determining rules are a first level pilot frequency port determining rule and a secondary level pilot frequency port determining rule respectively;

the first-level pilot port determination rule determined by the rule determination unit includes:

when the first-stage pilot port occupies an enhanced physical downlink control channel resource of a control resource element (CCE) in a physical resource block pair PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is as follows:

$n_{\mathrm{port}}^{\mathrm{1,1}}=n_{E-\mathrm{CCE}}+6,$

wherein,indicating a pilot port number corresponding to an enhanced physical downlink control channel resource occupying a CCE in the current PRB pair under the first-level pilot port determination rule, n_E-CCERepresents an E-CCE number;

the secondary pilot port determination rule determined by the rule determination unit includes:

when the secondary pilot port occupies an enhanced physical downlink control channel resource of a CCE within a PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is:

wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource occupying a CCE in the current PRB pair under the secondary pilot port determination rule, n_E-CCEIndicating the E-CCE number.

12. The apparatus of claim 11, further comprising:

and the agreement unit is used for agreeing pilot port determination rules of a plurality of levels in advance between the network side and the UE side before the rule determination unit determines the pilot port determination rule which needs to be adopted currently, and the pilot port determination rules of different levels have different enhanced physical control channel resource search spaces corresponding to the different levels.

13. The apparatus of claim 12, wherein the secondary pilot port agreed by the agreement unit determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the enhanced physical control channel resource search space under the rule for the pre-stage pilot port.

14. The apparatus of claim 11, further comprising:

and a parameter notification unit, configured to notify the UE of a pilot port configuration parameter before the rule determination unit determines the pilot port determination rule that needs to be currently used, where the pilot port configuration parameter is used to notify the UE of determining the pilot port by using a first-level pilot port determination rule on the network side, or determine the pilot port by using the first-level pilot port determination rule or at least one other pilot port determination rule.

15. The apparatus of any one of claims 11-14, further comprising:

a downlink control information sending unit, configured to send downlink control information to the UE through the pilot port determined by the port determining unit on the enhanced physical control channel resource allocated by the port determining unit.

16. An apparatus for receiving downlink control information, the apparatus comprising:

a rule determining unit, configured to determine a pilot port determination rule that is used by a network side for a user equipment UE, where the pilot port determination rule includes a correspondence between an enhanced physical control channel resource and a pilot port, and pilot ports corresponding to the same enhanced physical control channel resource under different pilot port determination rules are different;

a blind detection unit, configured to perform blind detection on the enhanced physical control channel according to the determined pilot port determination rule, so as to receive downlink control information;

the pilot frequency port determination rule adopted by the network side for the user equipment UE determined by the rule determination unit comprises two stages of pilot frequency port determination rules, wherein the two stages of pilot frequency port determination rules are a first stage pilot frequency port determination rule and a secondary pilot frequency port determination rule respectively;

the first-level pilot port determination rule determined by the rule determination unit includes:

when the first-stage pilot port occupies an enhanced physical downlink control channel resource of a CCE within a PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is:

$n_{\mathrm{port}}^{\mathrm{1,1}}=n_{E-\mathrm{CCE}}+6,$

wherein,indicating that the first-level pilot port is occupied in the current PRB pair under the determination rulePilot port number, n, corresponding to enhanced physical downlink control channel resource of one CCE_E-CCERepresents an E-CCE number;

the secondary pilot port determination rule determined by the rule determination unit includes:

when the secondary pilot port occupies an enhanced physical downlink control channel resource of a CCE within a PRB pair, the corresponding relationship between the enhanced physical downlink control channel resource and the pilot port is:

wherein,indicating the pilot port number corresponding to the enhanced physical control channel resource occupying a CCE in the current PRB pair under the secondary pilot port determination rule, n_E-CCEIndicating the E-CCE number.

17. The apparatus of claim 16, further comprising:

and the appointing unit is used for appointing pilot port determining rules of a plurality of levels in advance between the UE side and the network side before the rule determining unit determines that the network side determines the rule for the pilot port determining rule adopted by the UE, wherein the pilot port determining rules of different levels have different enhanced physical control channel resource searching spaces corresponding to the rules.

18. The apparatus of claim 17, wherein the secondary pilot port agreed by the agreement unit determines a pilot port corresponding to the enhanced physical control channel resource under the rule, and determines a pilot port that may not be used in the enhanced physical control channel resource search space under the rule for the pre-stage pilot port.

19. The apparatus of claim 16, further comprising:

a parameter receiving unit, configured to receive a pilot port configuration parameter notified by a network side, where the pilot port configuration parameter is used to notify a UE network side to determine a pilot port by using a first-level pilot port determination rule, or to determine a pilot port by using a first-level pilot port determination rule or at least one other pilot port determination rule;

and the rule determining unit determines the pilot port determination rule adopted by the UE by the network side according to the pilot port configuration parameters.

20. The apparatus according to any of the claims 16-19, wherein the blind detection unit is specifically configured to:

firstly, according to a first-stage pilot port determination rule, performing blind detection on an enhanced physical control channel in a first enhanced physical control channel resource search space or a first enhanced physical control channel resource search space subset corresponding to the first-stage pilot port determination rule, and if all downlink control information is successfully received, finishing the blind detection; otherwise, according to the secondary pilot frequency port determination rule, blind detection of the enhanced physical control channel is carried out in the enhanced physical control channel resource search space corresponding to the secondary pilot frequency port determination rule until all downlink control information is successfully received or blind detection of all enhanced physical control channel resource search spaces is completed.