CN103391626A

CN103391626A - Transmission method for enhanced physical downlink control channel (E-PDCCH) and time-frequency resource determination method and device

Info

Publication number: CN103391626A
Application number: CN2012101478191A
Authority: CN
Inventors: 赵锐; 潘学明; 拉盖施; 沈祖康
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2012-05-10
Filing date: 2012-05-10
Publication date: 2013-11-13
Anticipated expiration: 2032-05-10
Also published as: CN103391626B; WO2013166980A1

Abstract

The invention discloses a transmission method for an enhanced physical downlink control channel (E-PDCCH) and a time-frequency resource determination method and device. The transmission method for the E-PDCCH comprises the steps of determining numbers of an E-CCE (control channel element) of every E-PDCCH candidate in occupying a localized E-PDCCH in corresponding localized E-PDCCH candidate assemblies under every aggregation grade, and enabling absolute values of number difference values of a starting E-CCE between two random adjacent E-PDCCH candidates in the localized E-PDCCH candidate assemblies to be equal; and selecting time-frequency resources of one or a plurality of E-PDCCH candidates in the corresponding localized E-PDCCH candidate assemblies under every aggregation grade so as to send the E-PDCCH to a terminal. The localized E-PDCCH can have better frequency selectivity dispatch.

Description

E-PDCCH transmission method, time-frequency resource determination method and device

Technical Field

The invention relates to the technical field of communication, in particular to a transmission method of an E-PDCCH (enhanced physical downlink control channel), a time-frequency resource determination method of a distributed E-PDCCH and a corresponding device.

Background

In an LTE Rel-8/9/10(Long Term Evolution Rel-8/9/10, Long Term Evolution 8/9/10) system, a PDCCH (Physical Downlink Control Channel) is transmitted in each Downlink subframe, and it occupies the first N OFDM (orthogonal frequency Division Multiplexing) symbols of one Downlink subframe for transmission. Where N may take on values of 1, 2, 3, 4, and N-4 is only allowed to occur in a system with a system bandwidth of 1.4 MHz. The first N OFDM symbols are referred to herein as a "Legacy PDCCH region".

In the LTE Rel-8/9/10 system, the multiplexing relationship between the control region and the data region in one downlink subframe is shown in fig. 1. The Control region for transmitting the PDCCH (i.e., the conventional PDCCH region) is formed by logically divided CCEs (Control Channel elements). Mapping of CCE to REG (Resource Element group) employs a fully interleaved manner.

DCI (Downlink Control Information) is carried on the PDCCH. Then, the transmission of DCI is also based on CCE units. One DCI for one UE (User Equipment, i.e., terminal) may be transmitted in N logically consecutive CCEs, where N may take values of 1, 2, 4, and 8 in an LTE system, which is referred to as CCE Aggregation Level (Aggregation Level). And the UE performs PDCCH blind detection in the control region and searches whether the PDCCH sent by the UE exists. Blind detection is to use RNTI (radio network temporary identity) of the UE to perform decoding attempt on different DCI formats and CCE aggregation levels, and if decoding is correct, receiving DCI for the UE. Each downlink subframe of the LTE UE in a non-DRX (Discontinuous Reception) state needs to perform blind detection on a control region and search for a PDCCH.

Specifically, the UE searches for a PDCCH in a PDCCH search space of the downlink subframe control region, and receives DCI for the UE. In the LTE Rel-8/9/10 system, one downlink subframe includes two PDCCH Search spaces, namely CSS (Common Search Space) and UESS (UE-specific Search Space). The CSS is mainly used to transmit DCI scheduling cell-specific control information (e.g., system information, paging message, multicast power control information, etc.), and the UESS is mainly used to transmit DCI scheduled for each UE resource. The CSS in each downlink subframe occupies the first 16 CCEs of the control region, and only two CCE aggregation levels, 4 and 8, are supported in the CSS. The starting CCE location of the UESS of each UE in each downlink subframe is related to the subframe number of the downlink subframe, the RNTI of the UE, and the like, and four CCE aggregation levels of 1, 2, 4, and 8 may be supported in the UESS. In UESS, blind detection of each CCE aggregation level corresponds to one search space, that is, blind detection of different CCE aggregation levels by the UE is performed in different search spaces. Table 1 shows a search space for blind detection in one downlink subframe for one UE with different CCE aggregation levels. As shown in fig. 2, a UE needs to perform a search attempt of 22 PDCCH channel resources in one downlink subframe, where 6 PDCCH channel resources are shared by CSSs, and 16 PDCCH channel resources are shared by UESSs. The PDCCH channel resource refers to a time-frequency resource occupied by PDCCH candidate. In the present invention, the search space can also be described as a PDCCH candidate set. Taking the UESS with CCE aggregation level 1 in fig. 2 as an example, the corresponding PDCCH candidate set includes 6 PDCCHs candidates.

TABLE 1

In the design of the UESS, the problem of PDCCH blocking (blocking) among different UEs is considered, and different UEs adopt a hash function method related to RNTI and subframe numbers of downlink subframes on CCE resources of the whole PDCCH, so that the starting CCE positions of the UESS of different UEs are different, and the problem of PDCCH blocking is reduced to a certain extent.

In the LTE Rel-10 system, a Physical Downlink control Channel (R-PDCCH) for a Relay system is defined, and the R-PDCCH is used for a base station to transmit control signaling to the Relay, and occupies a PDSCH (Physical Downlink Shared Channel) region.

The R-PDCCH and PDSCH resource structures are shown in fig. 3. Wherein, the resource occupied by the R-PDCCH is configured through high-level signaling. The PRB pair (Physical resource Block pair) resources occupied by it may be continuous or discontinuous. In the definition of the search space of the R-PDCCH, the R-PDCCH does not include a common search space, and only the relay-dedicated R-PDCCH search space. The DL grant (Downlink grant) and UL grant (Uplink grant) are transmitted by TDM (Time-Division Multiplexing):

the DL grant is transmitted in the first slot, and in the first slot, Relay detects DCI format 1A and a DCI format associated with the transmission mode.

The UL grant is transmitted in the second slot. In the second slot, Relay detects the DCI format0 and a DCI format associated with the transmission mode.

Meanwhile, two mapping modes are defined in the transmission of the R-PDCCH, namely an interleaving mode and a non-interleaving mode, and different search spaces are defined for the R-PDCCH of the two mapping modes:

an interleaving manner following the definition of PDCCH in LTE Rel-8/9/10 system, with aggregation level in CCE units, each CCE consisting of 9 REGs (RE groups), wherein mapping between CCE and REG follows the interleaving manner defined in PDCCH; the definition of the search space of the R-PDCCH mapped by adopting the interleaving mode is consistent with the definition of UESS in an LTE Rel-8/9/10 system, and the initial CCE position of the search space of the R-PDCCH is related to the Relay-RNTI and the subframe number of the downlink subframe.

In the non-interleaved mode, the unit of the aggregation level is PRB, and the resource occupied by the candidate channel in the search space has a fixed mapping relation with the sequence of PRB. The starting position of the R-PDCCH search space always starts from the logical Resource Block (VRB) of logical number 0, and the set of R-PDCCH candidates (candidates) in one aggregation level occupy logically continuous resources.

The number of R-PDCCH candidate sets at each PRB aggregation level for the search space of the R-PDCCH mapped in a non-interleaved manner is shown in Table 2. The search space for the R-PDCCH is shown in fig. 4.

TABLE 2

In the LTE Rel-11 system, an E-PDCCH (Enhanced PDCCH) is introduced. And determining that the E-PDCCH has two transmission modes of frequency domain continuous transmission (localized) and frequency domain discontinuous transmission (distributed), and applying the transmission modes to different scenes. Under a general condition, the localized transmission mode is mostly used in a scenario that a base station can obtain more accurate channel information fed back by the UE, and the interference of the neighboring cell is not very severe along with the change of the subframe, at this time, the base station selects a continuous frequency resource with better quality to transmit the E-PDCCH to the terminal according to the CSI fed back by the UE, and performs precoding/beamforming processing to improve the transmission performance. In the case that channel information cannot be accurately obtained, or the interference of neighboring cells varies dramatically and unpredictably with subframes, it is necessary to transmit the E-PDCCH in a distributed manner, i.e., using frequency resources which are discontinuous in frequency for transmission, so as to obtain frequency diversity gain. As shown in fig. 5, in localized transmission mode, one E-PDCCH transmitted to one UE is located in one PRB pair. In the distributed transmission mode, one E-PDCCH transmitted to one UE occupies resources in four PRB pairs.

There is currently no solution to define the search space of the UE for the E-PDCCH, and thus no transmission scheme for the E-PDCCH.

In the design of the R-PDCCH search space of the non-interleaved mapping, the starting position of the R-PDCCH search space always starts from the VRB with the logic number of 0, and the R-PDCCH candidate set in one aggregation level occupies logically continuous resources. For the R-PDCCH, on one hand, because the number of relays is much smaller than that of UE, even if the starting points of the search spaces are the same, excessive R-PDCCH blocking cannot be caused, and meanwhile, because the resource granularity of the R-PDCCH is PRB, different relays can also realize different starting point positions by configuring different PRB resources; and on the other hand, the channel between the Relay and the base station is relatively stable, and the frequency selective scheduling can be realized through the semi-static configuration of resources. Therefore, the above method is adopted to define the starting position of the R-PDCCH search space and the R-PDCCH candidate set as a good choice.

However, in the LTE-Rel11 system, on one hand, the number of UEs in the system is much larger than the number of relays, and one PRB pair includes the minimum resource granularity of a plurality of E-PDCCH search spaces, such as E-CCE (Enhanced CCE), and resources cannot be fully utilized simply by configuring different PRB resources; on the other hand, the channel between the UE and the base station changes much more severely than the channel between the Relay and the base station, and the E-PDCCH candidate of the UE needs to cover as many PRB pair resources as possible, so that the frequency selective scheduling can be performed better. Therefore, the UESS of localized transmission mode E-PDCCH cannot be determined by reference to the definition of the R-PDCCH search space.

Disclosure of Invention

The invention aims to provide a transmission method of an E-PDCCH (enhanced-physical downlink control channel), a time-frequency resource determination method and a time-frequency resource determination device, so as to realize UESS (unified equipment system for satellite system) configuration and E-PDCCH transmission of the E-PDCCH.

In the invention, for the E-PDCCH, the aggregation level refers to the aggregation level of the E-CCE, and the value of the aggregation level L can be 1, 2, 4 and 8. Other values are also possible. The aggregation level has a resource granularity of E-CCE.

The purpose of the invention is realized by the following technical scheme:

a transmission method of an E-PDCCH comprises the following steps:

the network side equipment determines the number of E-CCEs of localized E-PDCCH occupied by each E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level according to the number of E-CCEs of localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH by the terminal in the current subframe and the number of E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level, and the absolute values of the number difference values of the initial E-CCEs between any two adjacent E-PDCCH localized in the localized E-PDCCH localized set corresponding to one aggregation level are equal;

the network side equipment selects one or more E-PDCCH candidates in the localized E-PDCCH candidates corresponding to various aggregation levels, and transmits the E-PDCCH to the terminal by using the selected E-PDCCH candidates to occupy time-frequency resources corresponding to the E-CCEs of the localized E-PDCCH.

A time-frequency resource determination method of distributed E-PDCCH comprises the following steps:

the method comprises the steps that network side equipment determines the number of E-CCEs of localized E-PDCCHs occupied by each E-PDCCH candidate in a localized E-PDCCH candidate set corresponding to an aggregation level L according to the number of E-CCEs of localized E-PDCCHs corresponding to time-frequency resources which can be used for transmitting the E-PDCCHs by a terminal in a current subframe and the number of E-PDCCHs candidate in a localized E-PDCCH candidate set corresponding to the aggregation level L, and the absolute values of the number difference values of initial E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set are equal;

the network side equipment determines time-frequency resources occupied by a frequency domain discontinuous transmission distributed E-PDCCH candidate set corresponding to the terminal under an aggregation level L according to the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the terminal under the aggregation level L, the time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level L are all or part of the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L, and the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L refer to the time-frequency resources occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to the localized E-CCEs corresponding to the localized E-PDCCHs.

A transmission method of an E-PDCCH comprises the following steps:

the terminal determines the number of E-CCEs of localized E-PDCCH occupied by each E-PDCCH localized set in the localized E-PDCCH localized set corresponding to each aggregation level according to the number of E-CCEs of localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe and the number of E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level, and the absolute values of the number difference values of the starting E-CCEs between any two adjacent E-PDCCH localized sets in the localized E-PDCCH localized set corresponding to one aggregation level are equal;

and the terminal receives the E-PDCCH on the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to at least one aggregation level.

the terminal determines the number of E-CCEs of localized E-PDCCH occupied by each E-PDCCH localized in a localized E-PDCCH localized set corresponding to an aggregation level L according to the number of E-CCEs of localized E-PDCCH corresponding to a time-frequency resource which can be used for transmitting the E-PDCCH in a current subframe and the number of E-PDCCH localized in the localized E-PDCCH localized set corresponding to the aggregation level L, wherein the absolute values of the number difference values of the initial E-CCEs between any two adjacent E-PDCCH localized sets in the localized E-PDCCH localized set are equal;

and the terminal determines the time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level L according to the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L, wherein the time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level L are all or part of the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L, and the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L refer to the time-frequency resources corresponding to the E-CCEs of the localized E-PDCCH candidate sets occupied by the E-PDCCH candidates in the localized E-PDCCH candidate set.

A network-side device, comprising:

a localized E-PDCCH search space determination module, configured to determine, according to the number of E-CCEs used by a terminal for continuously transmitting localized E-PDCCH in a frequency domain corresponding to a time-frequency resource which can be used for transmitting the E-PDCCH in a current subframe, and the number of E-PDCCH candidates in a localized E-PDCCH candidate set corresponding to each aggregation level, the number of E-CCEs of localized E-PDCCHs occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level, and the absolute value of the number difference of starting E-CCEs between any two E-PDCCHs adjacent to each other in the localized E-PDCCH candidate set corresponding to one aggregation level are equal;

and the E-PDCCH sending module is used for selecting one or more E-PDCCH candidates in the localized E-PDCCH candidates corresponding to various aggregation levels, and sending the E-PDCCH to the terminal by using the selected E-PDCCH candidates to occupy the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH.

A terminal, comprising:

the localized E-PDCCH search space determining module is used for determining that the absolute values of the number differences of the starting E-CCEs between any two adjacent localized E-PDCCH candidates in the localized E-PDCCH candidates corresponding to each aggregation level are equal, wherein the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe is equal to the number of the E-CCEs of the localized E-PDCCH candidates corresponding to each aggregation level;

and the E-PDCCH receiving module is used for receiving the E-PDCCH on the time frequency resource corresponding to the E-CCE of the localized E-PDCCH occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to at least one aggregation level.

A terminal, comprising:

a localized E-PDCCH search space determination module, configured to determine, according to the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that the terminal may be used to transmit an E-PDCCH in a current subframe and the number of E-PDCCHcandials in a localized E-PDCCH candialate set corresponding to an aggregation level L, that each E-PDCCH candiale in the localized E-PDCCH candialate set corresponding to the aggregation level L occupies the number of the E-CCEs of the localized E-PDCCH, and that absolute values of differences in the numbers of the starting E-CCEs between any two adjacent E-PDCCH candiales in the localized E-PDCCH candialate set are equal;

the distributed E-PDCCH search space determining module is used for determining time-frequency resources occupied by the corresponding distributed E-PDCCH candidate set under a polymerization level L according to the time-frequency resources occupied by the corresponding localized E-PDCCH candidate set of the terminal under the polymerization level L, the time-frequency resources occupied by the corresponding distributed E-PDCCH candidate set under the polymerization level L are all or part of the time-frequency resources occupied by the corresponding localized E-PDCCH candidate set under the polymerization level L, and the time-frequency resources occupied by the corresponding localized E-PDCCH candidate set under the polymerization level L refer to the time-frequency resources occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set occupying the corresponding E-CCEs of localized E-PDCCHs.

Before E-PDCCH transmission, each E-PDCCH candidate in a localized E-PDCCH candidate set corresponding to each aggregation level occupies the E-CCE of the localized E-PDCCH, namely a search space (UESS) for configuring the localized E-PDCCH for the terminal. And defines that the localized E-PDCCH candidate set under each aggregation level of a terminal is dispersed on the time-frequency resources which can be used for transmitting the E-PDCCH by the terminal, so that the localized E-PDCCH can obtain better frequency selective scheduling. According to the method and the device for determining the time-frequency resource of the distributed E-PDCCH, provided by the invention, all or part of the time-frequency resource occupied by the corresponding localized E-PDCCH candidate set under the aggregation level L is used as the time-frequency resource of the distributed E-PDCCH, so that the frequency diversity gain can be realized, and further, the resource utilization rate is improved.

Drawings

Fig. 1 is a schematic diagram illustrating a multiplexing relationship between a control region and a data region in a conventional downlink subframe;

fig. 2 is a UESS diagram of a conventional PDCCH;

FIG. 3 is a schematic diagram of a conventional R-PDCCH and PDSCH resource structure;

FIG. 4 is a schematic diagram of a search space of a conventional R-PDCCH;

FIG. 5 is a schematic diagram of a resource structure of an E-PDCCH in two conventional transmission modes;

fig. 6 is a flowchart of a method for transmitting an E-PDCCH of a network device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of time-frequency resources occupied by a localized E-PDCCH candidate set according to an embodiment of the present invention;

fig. 8 is a flowchart of a time-frequency resource determining method for a distributed E-PDCCH of a base station side device according to an embodiment of the present invention;

fig. 9 is a schematic diagram of time-frequency resources occupied by a distributed E-PDCCH candidate set according to an embodiment of the present invention;

fig. 10 is a flowchart of a terminal-side E-PDCCH transmission method according to an embodiment of the present invention;

FIG. 11 is a flowchart of a time-frequency resource determination method for a distributed E-PDCCH on a terminal side according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a network-side device according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of another network-side device according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of another terminal according to an embodiment of the present invention.

Detailed Description

In the invention, the resource granularity of the search space of the E-PDCCH is E-CCE.

Based on this, the present invention provides a transmission method of an E-PDCCH, which is implemented as shown in fig. 6, and specifically includes the following operations:

step 100, the network side device determines the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level according to the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH by the terminal in the current subframe and the number of the E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level.

Wherein, the absolute values of the number difference values of the starting E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to one aggregation level are equal.

That is, the localized E-PDCCHcandidate set at each aggregation level for a terminal is spread over the time-frequency resources that the terminal may use to transmit the E-PDCCH.

The number of E-CCEs occupying the localized E-PDCCH in each localized E-PDCCH candidate set corresponding to the aggregation level L is L. Correspondingly, the number of the E-CCE of the localized E-PDCCH occupied by one E-PDCCH localized in the localized E-PDCCH localized set corresponding to the aggregation level L means the number of the L E-CCEs of the localized E-PDCCH localized occupied by the E-PDCCH localized.

Step 110, the network side device selects one or more E-PDCCH candidates in the localized E-PDCCH candidates corresponding to various aggregation levels, and transmits the E-PDCCH to the terminal by using the selected E-PDCCH candidates to occupy the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH.

Before the E-PDCCH is sent to the terminal, the method allocates the E-CCE of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCH candidate set corresponding to each aggregation level to the terminal, namely the terminal is allocated with the search space (UESS) of the localized E-PDCCH. And defines that the localized E-PDCCH candidate set under each aggregation level of a terminal is dispersed on the time-frequency resources which can be used for transmitting the E-PDCCH by the terminal, so that the localized E-PDCCH can obtain better frequency selective scheduling.

In the invention, E-CCEs are respectively defined for localized E-PDCCH and distributed E-PDCCH. Wherein, the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH corresponding to one aggregation level is located in one PRB pair. And the E-CCEs of the continuously numbered localized E-PDCCH are corresponded to the time-frequency resources which can be used for transmitting the E-PDCCH. That is to say, the E-CCEs numbering adjacent localized E-PDCCHs are also adjacent on the physical resource, that is, the time-frequency resource corresponding to the E-CCE numbering adjacent localized E-PDCCHs is within one PRB pair, or the time-frequency resource corresponding to the E-CCE numbering adjacent localized E-PDCCHs is located in an adjacent VRB. For example, the allocated PRBs pair for the E-PDCCH are 1, 5, 15 and 30, one PRB pair corresponds to the E-CCEs of 4 localized E-PDCCH, and the E-CCEs of 16 localized E-PDCCH can be used for transmitting the E-PDCCH and are numbered from 0 to 15. The time-frequency resources corresponding to the E-CCEs of localized E-PDCCHs numbered 1 and 2 are inside PRB pair 1. The time-frequency resources corresponding to the E-CCEs of localized E-PDCCHs numbered 3 and 4 are respectively positioned at the ending position of PRB pair 1 and the starting position of PRB pair2, namely positioned in adjacent VRBs.

In the present invention, the above-mentioned absolute values of the number differences of the starting E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level are equal to each other may specifically be: the difference of the number of the starting E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level is an integral multiple of the aggregation level corresponding to the localized E-PDCCH candidate set.

The above-mentioned absolute values of the number difference of the starting E-CCE between any two adjacent localized E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level may specifically be: the difference value of the number of the initial E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to one aggregation level is the least common multiple of the aggregation level corresponding to the localized E-PDCCH candidate set and the number K of the E-CCEs corresponding to one PRB pair.

It should be noted that the interval between any two adjacent E-PDCCH candidates in one localized E-PDCCH candidate set is not limited to the above two cases, as long as the E-PDCCH candidates in one localized E-PDCCH candidate set are discontinuous and the interval between two adjacent E-PDCCH candidates is the same.

In the invention, the network side equipment allocates the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe to the terminal in advance. The specific time-frequency resource allocation method is known to those skilled in the art, and is not described herein again. After the time-frequency resource which can be used for transmitting the E-PDCCH by the terminal in the current subframe is determined, the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH by the terminal in the current subframe can be determined according to the corresponding relation between the E-CCE of the localized E-PDCCH and the time-frequency resource.

In the present invention, the network side device further determines in advance the number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level, and the specific implementation manner may be, but is not limited to: the network side equipment determines the number of E-PDCCH candidates in a localized E-PDCCH candidate set corresponding to each aggregation level according to the convention with the terminal; or, the network side device determines the number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level, and sends the determined number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level to the terminal, which may be, but is not limited to, sending through signaling.

The start position of its UESS may be different for different terminals. Then, the implementation manner of the above step 100 may specifically be: and the network side equipment determines the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCHcandicate in the localized E-PDCCH candate set corresponding to each aggregation level according to the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH by the terminal in the current subframe, the number of the E-PDCCH candate in the localized E-PDCCH candate set corresponding to each aggregation level and the initial position of the localized E-PDCCH candate set corresponding to each aggregation level.

The starting position of the localized E-PDCCH candidate set corresponding to the aggregation level L is the starting E-CCE number of the localized E-PDCCH candidate set corresponding to the aggregation level L on the time-frequency resource used for transmitting the E-PDCCH.

Correspondingly, the method provided by the invention can further comprise the following steps: the network side equipment determines an offset parameter (offset) of a starting position of a corresponding localized E-PDCCH candidate set in each aggregation level according to the RNTI of the terminal in a mode appointed by the terminal; and determining the starting position of the corresponding localized E-PDCCH candidate set in each aggregation level according to the offset.

The specific implementation manner of determining the offset of the starting position of the localized E-PDCCH candidate set corresponding to each aggregation level according to the RNTI of the terminal in the manner agreed with the terminal may be, but is not limited to: determining offset of the starting position of the corresponding localized E-PDCCH candidate set under each aggregation level by using a hash function related to the RNTI and the current subframe number of the terminal, wherein the hash function is appointed with the terminal; or, according to the convention with the terminal, determining the offset of the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation level through a formula mod (RNTI, K/L). Of course, the offset of the starting position of the corresponding localized E-PDCCH candidate set in each aggregation level may also be determined by other methods based on the RNTI of the terminal.

Alternatively, the method provided by the present invention may further include: the network side equipment determines the offset of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the RNTI of the terminal; determining the starting position of the corresponding localized E-PDCCHcandidate set under each aggregation level according to the offset; and sending the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set under each aggregation level to the terminal. For a specific implementation manner of determining the offset of the starting position of the corresponding localized E-PDCCH candidate set in each aggregation level, the network side device may refer to the foregoing description, and details are not described here.

Alternatively, the method provided by the present invention may further include: the network side equipment determines the offset of the initial position of the corresponding localized E-PDCCH candidate set in each aggregation level according to the preset offset parameter related information and the RNTI of the terminal; determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset; and sending the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to one aggregation level to the terminal, so that the terminal determines the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to other aggregation levels according to the offset parameter correlation information. For a specific implementation manner of determining the offset of the starting position of the corresponding localized E-PDCCH candidate set in each aggregation level, the network side device may refer to the foregoing description, and details are not described here.

The offset parameter association information is pre-agreed by the network side device and the terminal, and is used for describing an association relationship between offsets of starting positions of corresponding localized E-PDCCH candidate sets in various aggregation levels.

And if the number difference of the initial E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L is integral multiple of the aggregation level corresponding to the localized E-PDCCH candidate set. Preferably, the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to the aggregation level L can be determined by the following formula:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i

wherein S is₀The E-CCE number corresponding to the initial position of the time-frequency resource which can be used for transmitting the E-PDCCH can be defaulted to 0; m is in the range of 0, 1, … …, M^(L)-1, representing the mth E-PDCCH candidate in the localized E-PDCCH candidate set; n is a radical of_eCCERepresenting the number of E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the localized E-PDCCH; m^(L)The number of E-PDCCH candidates in the localized E-PDCCH candidate set is represented; offset^(L)An offset parameter indicating a starting position of the localized E-PDCCH candidate set; s₀+offset^(L)A number indicating a starting E-CCE corresponding to a starting position of the localized E-PDCCH candidate set; s₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]A starting E-CCE number indicating the mth E-PDCCH candidate in the localized E-PDCCH candidate set; i ═ 0, … … L-1, and indicates the number of E-CCEs of localized E-PDCCHs occupied by one E-PDCCH localized after the starting E-CCE in the localized E-PDCCH localized set.

If the difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L is the least common multiple of the aggregation level L and the number K of the E-CCEs corresponding to one PRB pair, the number of the E-CCEs of the localized E-PDCCH candidates occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to the aggregation level L can be represented by the following formula:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+i

wherein S is₀The E-CCE number corresponding to the initial position of the time-frequency resource which can be used for transmitting the E-PDCCH can be defaulted to 0; m is in the range of 0, 1, … …, M^(L)-1, representing the mth E-PDCCH candidate in the localized E-PDCCH candidate set; n is a radical of_eCCERepresenting the number of E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the localized E-PDCCH; m^(L)The number of E-PDCCH candidates in the localized E-PDCCH candidate set is represented; offset^(L)An offset parameter indicating a starting position of the localized E-PDCCH candidate set; s₀+offset^(L)A number indicating a starting E-CCE corresponding to a starting position of the localized E-PDCCH candidate set; s₀+offet^(L)·L+m·[floor(NeCCE/M^(L)/L)·L]A starting E-CCE number indicating the mth E-PDCCH candidate in the localized E-PDCCH candidate set; i ═ 0, … … L-1, which indicates the number of localized E-CCEs occupied by one E-PDCCH localized after the starting E-CCE in the localized E-PDCCH localized set; q represents the least common multiple of L and K.

It is assumed that the UE1 and the UE2 are configured with the same time-frequency resources for transmitting the E-PDCCH. The time-frequency resource is composed of 6 PRB pairs, and each PRB pair corresponds to 4E-CCEs. Offset for UE1 ⁽¹⁾0, offset of UE2⁽¹⁾Is 2. The number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to UE1 in aggregation level 1 and aggregation level 2 is 6. Corresponding localized E-PDCCH of UE1 at aggregation level 1 and aggregation level 2The number of E-PDCCHcandidates in the candidate set is 6. Then, according to the above formula S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+ i is the number of E-CCEs that each E-PDCCH candidate occupies the localized E-PDCCH in the localized E-PDCCH candidate set corresponding to aggregation level 1 and aggregation level 2 determined by UE1, and the number of E-CCEs that each E-PDCCH candidate occupies the localized E-PDCCH in the localized E-PDCCH candidate set corresponding to aggregation level 1 and aggregation level 2 determined for UE2, as shown in FIG. 7.

Wherein, numerals 0 to 23 represent the E-CCE numbers of the localized E-PDCCH. The starting point of the UE1 is the starting position of the corresponding localized E-PDCCH candidate set of the UE1 at the corresponding aggregation level. Each PRB pair may be discontinuous in the frequency domain, but the corresponding VRBs are continuous.

The invention also provides a method for determining time-frequency resources of distributed E-PDCCH, the implementation manner is shown in FIG. 8, and the specific implementation manner comprises the following steps:

step 200, the network side device determines the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to the aggregation level L according to the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH by the terminal in the current subframe and the number of the E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L.

And the absolute values of the number difference values of the initial E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L are equal.

The specific implementation manner of step 200 may refer to each embodiment of the above-mentioned E-PDCCH transmission method, and determine, for the terminal, a specific implementation manner in which each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level occupies the E-CCE of the localized E-PDCCH, which is not described herein again.

Step 210, the network side device determines, according to the time-frequency resource occupied by the localized E-PDCCH candidate set corresponding to the terminal in the aggregation level L, the time-frequency resource occupied by the frequency-domain discontinuous transmission distributed E-PDCCH candidate set corresponding to the terminal in one aggregation level.

The time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level are all or part of the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L. For example, the time-frequency resource occupied by the distributed E-PDCCH candidate set corresponding to aggregation level 2 is the same as the time-frequency resource occupied by the localized E-PDCCH candidate set corresponding to aggregation level 1, or is a subset of the time-frequency resource occupied by the localized E-PDCCH candidate set corresponding to aggregation level 1.

The time-frequency resource occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L refers to the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH candidate set occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set.

Because the time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level are all or part of the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L, the time-frequency resources of the distributed E-PDCCH search space determined for the terminal inherit the advantages of localized E-PDCCH search space configuration, better frequency selection scheduling can be obtained, and frequency diversity gain is realized. On the basis, the resource utilization rate of the system is also improved.

As described above, for localized E-PDCCH and distributed E-PDCCH, E-CCEs are defined, respectively. Wherein E-CCEs of the distributed E-PDCCH are discontinuously distributed on time-frequency resources. That is, there may be a plurality of partial time-frequency resources in the PRB pair corresponding to the E-CCE of one distributed E-PDCCH. Correspondingly, the time-frequency resource occupied by one distributed E-PDCCH candidate of the distributed E-PDCCH candidate set corresponding to the aggregation level L is the combination of partial or all time-frequency resources occupied by each E-PDCCH candidate in a plurality of E-PDCCH candidates of the localized E-PDCCH candidate set corresponding to the aggregation level L.

For example, assume that the time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to aggregation level L are the same as the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to aggregation level 1. The value of L can be 2, 4 and 8. The time-frequency resources occupied by the corresponding distributed e-PDCCH candidate set at the aggregation level L are as shown in fig. 9.

The time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level 1 are distributed on 8 PRB pairs, and each PRB pair corresponds to the E-CCEs of 4 localized E-PDCCHs. These 8 PRB pairs may be discontinuous in the frequency domain, but the corresponding VRBs are continuous.

For the corresponding distributed E-PDCCH candidate set in aggregation level L (L ═ 2, 4, and 8), the time-frequency resource distribution occupied by the E-PDCCH candidate is shown in fig. 9. Taking E-PDCCH candidate 1 in the distributed E-PDCCH candidate set corresponding to aggregation level 2 as an example, the time-frequency resources occupied by the E-PDCCH candidate 1 may be part or all of the time-frequency resources occupied by E-PDCCH candidate 1 in the localized E-PDCCH candidate set corresponding to aggregation level 1 and part or all of the time-frequency resources occupied by E-PDCCH candidate 5.

The value of the polymerization level L may also be 1. For the distributed E-PDCCH candidate set corresponding to aggregation level 1, if one E-CCE includes multiple E-REGs, the time-frequency resource occupied by the E-PDCCH candidate may be obtained by directly reasoning with reference to the time-frequency resource distribution occupied by the E-PDCCH candidate in the distributed E-PDCCH candidate set corresponding to aggregation level 2, and details are not repeated here.

The invention also provides a transmission method of the E-PDCCH, the implementation mode is shown as the following figure 10:

step 300, the terminal determines the number of E-CCEs of localized E-PDCCH occupied by each E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level according to the number of E-CCEs of localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe and the number of E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level;

wherein the absolute values of the number difference values of the initial E-CCEs between any two adjacent E-PDCCHcandials in one localized E-PDCCH candials set are equal.

Step 310, the terminal receives the E-PDCCH on the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to at least one aggregation level.

In the method provided by the invention, before the terminal receives the E-PDCCH, the E-CCE of the localized E-PDCCH occupied by each E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level is determined, namely the search space (UESS) of the localized E-PDCCH is determined. And defines that a localized E-PDCCHcandidate set under each aggregation level of a terminal is dispersed on time-frequency resources which can be used for transmitting the E-PDCCH by the terminal, so that the localized E-PDCCH can obtain better frequency selective scheduling.

In the method for transmitting E-PDCCH on the terminal side, for a specific mapping relationship between E-CCE of localized E-PDCCH and time-frequency resource that may be used by the terminal for transmitting E-PDCCH in the current subframe, a specific meaning that an absolute value of a difference between starting E-CCEs of any two adjacent E-PDCCH candidates in one localized E-PDCCH candidate set is equal, a definition of an offset parameter of a starting position of a corresponding localized E-PDCCH candidate set at an aggregation level, and the like, reference is made to the description of each embodiment of the network-side device method, and details are not repeated here.

In the present invention, the terminal also predetermines the number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level, and the specific implementation manner may be, but is not limited to: the terminal determines the number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level according to the convention with the network side equipment; or, the terminal receives the number of the E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level sent by the network side device.

The start position of its UESS may be different for different terminals. Then, the implementation manner of the above step 300 may specifically be: and the terminal determines the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level according to the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe, the number of the E-PDCCH localized set in the localized E-PDCCH localized set corresponding to each aggregation level and the initial position of the localized E-PDCCH localized set corresponding to each aggregation level.

Correspondingly, the method provided by the invention can further comprise the following steps: the terminal determines the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the RNTI of the terminal in a mode appointed by the network side equipment; and determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter. . The specific implementation manner of the method may refer to the description of the network side device method, which is not described herein again.

Alternatively, the method provided by the present invention may further include: the terminal receives the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level sent by the network side equipment; and determining the starting position of the corresponding localized E-PDCCHcandidate set at each aggregation level according to the offset parameter.

Alternatively, the method provided by the present invention may further include: the terminal receives an offset parameter of the initial position of a corresponding localized E-PDCCH candidate set at an aggregation level sent by the network side equipment; determining offset parameters of the initial positions of the corresponding localized E-PDCCH candidate sets under other aggregation levels according to the determined offset parameter correlation information; and determining the initial position of the localized E-PDCCH candidate set corresponding to each aggregation level according to the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to each aggregation level.

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i

for the explanation of the formula, reference may be made to the description of the above embodiments, which are not repeated here.

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+i

The invention also provides a method for determining time-frequency resources of distributed E-PDCCH, the implementation manner is shown in FIG. 11, and the specific implementation manner comprises the following operations:

step 400, the terminal determines the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to the aggregation level L according to the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe and the number of the E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L.

For the specific implementation of step 400, reference may be made to the foregoing embodiments of the E-PDCCH transmission method, and the terminal determines a specific implementation manner that each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level occupies the E-CCE of the localized E-PDCCH, which is not described herein again.

And step 410, the terminal determines the time frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level according to the time frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L.

The time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level are all or part of the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L.

Because the time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level are all or part of the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L, the time-frequency resources of the distributed E-PDCCH search space determined by the terminal inherits the advantages of localized E-PDCCH search space configuration, better frequency selection scheduling can be obtained, and frequency diversity gain is realized. On the basis, the resource utilization rate of the system is also improved.

The time-frequency resource occupied by one distributed E-PDCCH candidate of the distributed E-PDCCH candidate set corresponding to one aggregation level is the combination of partial or all time-frequency resources occupied by each E-PDCCH candidate in a plurality of E-PDCCH candidates of the localized E-PDCCH candidate set corresponding to the aggregation level L. Specifically, reference may be made to the description of the network side device method, which is not described herein again.

The invention also provides a network side device, the structure of which is shown in fig. 12, and the specific implementation structure is as follows:

a localized E-PDCCH search space determining module 1001, configured to determine, according to the number of E-CCEs in a frequency domain consecutive transmission localized E-PDCCH corresponding to a time-frequency resource that may be used by a terminal to transmit the E-PDCCH in a current subframe, and the number of E-PDCCHs candidate candidates in a localized E-PDCCH candidate set corresponding to each aggregation level, a number of the E-CCEs that each E-PDCCH candidate occupies the localized E-PDCCH in the localized E-PDCCH candidate set corresponding to each aggregation level. Wherein, the absolute values of the number difference values of the starting E-CCEs between any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set under one aggregation level are equal.

An E-PDCCH sending module 1002, configured to select one or more E-PDCCHs candidate sets in the localized E-PDCCH candidate set corresponding to various aggregation levels, and send the E-PDCCH to the terminal by using the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH occupied by the selected E-PDCCH candidate set.

The network side device in the present invention may be, but is not limited to, an eNB (base station).

Before the E-PDCCH is sent to the terminal, the network side equipment allocates the E-CCEs of localized E-PDCCHcandidates occupied by each E-PDCCHcandidate in the localized E-PDCCH candidate set corresponding to each aggregation level to the terminal, namely allocates search spaces (UESS) of the localized E-PDCCHs to the terminal. And defines that the localized E-PDCCH candidate set under each aggregation level of a terminal is dispersed on the time-frequency resources which can be used for transmitting the E-PDCCH by the terminal, so that the localized E-PDCCH can obtain better frequency selective scheduling.

The network side device may further include a first E-PDCCH candidate number configuration module, configured to determine, according to the agreement with the terminal, the number of E-PDCCHs candidates in a localized E-PDCCH candidate set corresponding to each aggregation level; or, the second E-PDCCH candidate number configuration module is configured to determine the number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level, and send the determined number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level to the terminal.

In the present invention, the localized E-PDCCH search space determining module 1001 may be specifically configured to determine, according to the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that may be used by a terminal to transmit an E-PDCCH in a current subframe, the number of E-PDCCHs candidate sets in a localized E-PDCCH candidate set corresponding to each aggregation level, and an initial position of a localized E-PDCCH candidate set corresponding to each aggregation level, a number of E-CCEs of the localized E-PDCCH candidate sets occupied by each E-PDCCH candidate set in the localized E-PDCCH candidate set corresponding to each aggregation level.

Correspondingly, the network side device may further include a starting position configuration module of the first localized E-PDCCH candidate set, configured to determine, according to the RNTI of the terminal, an offset parameter of a starting position of the localized E-PDCCH candidate set corresponding to each aggregation level according to a manner agreed with the terminal; and determining the starting position of the corresponding localized E-PDCCHcandidate set at each aggregation level according to the offset parameter.

Or, the network side device may further include a starting position configuration module of a second localized E-PDCCH candidate set, configured to determine, according to the RNTI of the terminal, an offset parameter of a starting position of a corresponding localized E-PDCCH candidate set in each aggregation level; determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter; and sending the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set in each aggregation level to the terminal.

Or, the network side device may further include a starting position configuration module of a third localized E-PDCCH candidate set, configured to determine, according to predetermined offset parameter-related information and the RNTI of the terminal, an offset parameter of a starting position of a corresponding localized E-PDCCH candidate set in each aggregation level; determining the initial position of a corresponding localized E-PDCCHcandidate set under each aggregation level according to the offset parameter; and sending the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to one aggregation level to the terminal so that the terminal determines the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to other aggregation levels according to the offset parameter correlation information.

If the difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L is an integral multiple of the aggregation level corresponding to the localized E-PDCCH candidate set, the number of the E-CCEs of the localized E-PDCCH candidates occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to the aggregation level L can be represented by the following formula:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i

the formula can be explained by referring to the description of the above embodiment, and the description is omitted here.

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q ]+i

The invention also provides a network side device, which is implemented as shown in fig. 13, and has the following specific implementation structure:

a localized E-PDCCH search space determining module 2001, configured to determine, according to the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that may be used by the terminal to transmit the E-PDCCH in a current subframe, and the number of E-PDCCHs candidate in a localized E-PDCCH candidate set corresponding to an aggregation level L, a number of E-CCEs of the localized E-PDCCH candidate occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to the aggregation level L. And the absolute values of the number difference values of the initial E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L are equal.

A distributed E-PDCCH search space determining module 2002, configured to determine, according to a time-frequency resource occupied by a localized E-PDCCH candidate set corresponding to the terminal in an aggregation level L, a time-frequency resource occupied by a frequency-domain discontinuous transmission distributed E-PDCCH candidate set corresponding to the terminal in an aggregation level. Wherein, the time frequency resources occupied by the distributed E-PDCCHcandidate set corresponding to the aggregation level are all or part of the time frequency resources occupied by the localized E-PDCCHcandidate set corresponding to the aggregation level L. The time-frequency resource occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L refers to the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH candidate set occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set.

The time-frequency resource occupied by one distributed E-PDCCH candidate of the distributed E-PDCCH candidate set corresponding to one aggregation level is the combination of partial or all time-frequency resources occupied by each E-PDCCH candidate in a plurality of E-PDCCH candidates of the localized E-PDCCH candidate set corresponding to the aggregation level L.

The invention also provides a terminal, the structure of which is shown in fig. 14, and the specific implementation structure is as follows:

a localized E-PDCCH search space determining module 3001, configured to determine, according to the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that may be used for transmitting the E-PDCCH in a current subframe, and the number of E-PDCCHs candidate in a localized E-PDCCH candidate set corresponding to each aggregation level, a number of E-CCEs of the localized E-PDCCH candidate occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level. Wherein, the absolute values of the number difference values of the starting E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to one aggregation level are equal.

An E-PDCCH receiving module 3002, configured to receive an E-PDCCH on a time-frequency resource corresponding to an E-CCE of a localized E-PDCCH occupied by each E-PDCCH candidate in a localized E-PDCCH candidate set corresponding to at least one aggregation level.

Before receiving the E-PDCCH, the terminal determines that each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level occupies the E-CCE of the localized E-PDCCH, namely determines the search space (UESS) of the localized E-PDCCH. And defines that the localized E-PDCCH candidate set under each aggregation level of a terminal is dispersed on the time-frequency resources which can be used for transmitting the E-PDCCH by the terminal, so that the localized E-PDCCH can obtain better frequency selective scheduling.

The terminal provided by the invention can also comprise a first E-PDCCH candidate number configuration module which is used for determining the number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level according to the convention with the network side equipment; or, the second E-PDCCHcandidate number configuration module is configured to receive the number of E-PDCCHs in the localized E-PDCCH candidate set corresponding to each aggregation level sent by the network side device.

In the present invention, the localized E-PDCCH search space determining module 3001 may be specifically configured to determine, according to the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that may be used by the terminal to transmit an E-PDCCH in a current subframe, the number of E-PDCCHs candidate sets in a localized E-PDCCH candidate set corresponding to each aggregation level, and a starting position of a localized E-PDCCH candidate set corresponding to each aggregation level, a number of E-CCEs of the localized E-PDCCH candidate sets occupied by each E-PDCCH candidate set in the localized E-PDCCH candidate set corresponding to each aggregation level.

Correspondingly, the terminal may further include a starting position configuration module of the first localized E-PDCCH candidate set, configured to determine, according to the RNTI of the terminal, an offset parameter of the starting position of the localized E-PDCCH candidate set corresponding to each aggregation level in a manner agreed with the network side device; and determining the starting position of the corresponding localized E-PDCCHcandidate set at each aggregation level according to the offset parameter.

Or, the terminal may further include a starting position configuration module of a second localized E-PDCCH candidate set, configured to receive an offset parameter of a starting position of a corresponding localized E-PDCCH candidate set in each aggregation level sent by the network side device; and determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter.

Or, the terminal may further include a starting position configuration module of a third localized E-PDCCH candidate set, configured to receive an offset parameter of a starting position of a corresponding localized E-PDCCH candidate set in an aggregation level sent by the network side device; determining offset parameters of the initial positions of the corresponding localized E-PDCCH candidate sets under other aggregation levels according to the preset offset parameter association information; and determining the starting position of the corresponding localized E-PDCCH candidate set in each aggregation level according to the offset parameter of the starting position of the corresponding localized E-PDCCH candidate set in each aggregation level.

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q ]+i

The invention also provides a terminal, the implementation structure of which is shown in fig. 15, and the specific implementation structure is as follows:

the localized E-PDCCH search space determination module 4001 is configured to determine, according to the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that the terminal may use to transmit the E-PDCCH in a current subframe and the number of E-PDCCHcandials in a localized E-PDCCH candialate set corresponding to an aggregation level L, a number of E-CCEs that each E-PDCCH candialate in the localized E-PDCCH candialate set corresponding to the aggregation level L occupies the localized E-CCEs of the localized E-PDCCH. And the absolute values of the number difference values of the initial E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level L are equal.

The distributed E-PDCCH search space determining module 4002 is configured to determine, according to the time-frequency resource occupied by the localized E-PDCCH candidate set corresponding to the terminal in the aggregation level L, the time-frequency resource occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level L. The time-frequency resources occupied by the distributed E-PDCCH candidate set corresponding to the aggregation level are all or part of the time-frequency resources occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L. The time-frequency resource occupied by the localized E-PDCCH candidate set corresponding to the aggregation level L refers to the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH candidate set occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set.

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

1. A transmission method of an enhanced physical downlink control channel (E-PDCCH) is characterized by comprising the following steps:

the network side equipment determines the number of E-CCEs of localized E-PDCCH occupied by each E-PDCCH localized in a localized E-PDCCH localized set corresponding to each aggregation level according to the number of enhanced control channel units (E-CCEs) for continuously transmitting the localized E-PDCCH in a frequency domain corresponding to a time-frequency resource which can be used for transmitting the E-PDCCH by a terminal in a current subframe and the number of E-PDCCHlocalized in the localized E-PDCCH localized set corresponding to each aggregation level, and the absolute value of the difference value of the number of the initial E-CCEs between any two adjacent E-PDCCH localized sets in the localized E-PDCCH localized set corresponding to one aggregation level is equal;

2. The method of claim 1, wherein:

and on the time-frequency resources which can be used for transmitting the E-PDCCH, the E-CCEs of the continuously numbered localized E-PDCCH are corresponding, and the time-frequency resources corresponding to the E-CCEs of one localized E-PDCCH are positioned inside one physical resource block pair PRB pair.

3. The method of claim 2, wherein the absolute difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at an aggregation level is equal to:

the number difference of the initial E-CCE between any two adjacent E-PDCCH candidates in a localized E-PDCCH candidate set corresponding to an aggregation level is an integral multiple of the aggregation level corresponding to the localized E-PDCCH candidate set;

or,

the difference value of the number of the initial E-CCEs between any two adjacent E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to the aggregation level is the least common multiple of the aggregation level corresponding to the localized E-PDCCH candidate set and the number K of the E-CCEs corresponding to one PRB pair.

4. The method according to claim 1 or 2, characterized in that the method further comprises:

the network side equipment determines the number of E-PDCCH candidates in a localized E-PDCCH candidate set corresponding to each aggregation level according to the convention with the terminal;

or,

and the network side equipment determines the number of the E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level, and sends the determined number of the E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level to the terminal.

5. The method according to claim 1 or 2, wherein determining the number of E-CCEs of localized E-PDCCHs occupied by each E-PDCCH localized in the localized E-PDCCH localized set corresponding to each aggregation level specifically comprises:

and the network side equipment determines the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH localized set in the localized E-PDCCH localized set corresponding to each aggregation level according to the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH by the terminal in the current subframe, the number of the E-PDCCH localized set in the localized E-PDCCH localized set corresponding to each aggregation level and the initial position of the localized E-PDCCH localized set corresponding to each aggregation level.

6. The method of claim 5, further comprising:

the network side equipment determines the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the Radio Network Temporary Identifier (RNTI) of the terminal in a mode appointed by the terminal;

and the network side equipment determines the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter.

7. The method of claim 5, further comprising:

the network side equipment determines the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the RNTI of the terminal;

the network side equipment determines the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter;

the network side equipment sends the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level to the terminal;

or,

the network side equipment determines the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the preset offset parameter correlation information and the RNTI of the terminal;

and the network side equipment sends the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to one aggregation level to the terminal, so that the terminal determines the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to other aggregation levels according to the offset parameter correlation information.

8. The method of claim 3, wherein if a difference in the number of starting E-CCEs between any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at the aggregation level L is an integer multiple of the aggregation level corresponding to the localized E-PDCCH candidate set, the number of the E-CCEs of the localized E-PDCCHs occupied by the respective E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at the aggregation level L is:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i，

wherein S is₀Representing the E-CCE number corresponding to the starting position of the time-frequency resource which can be used for transmitting the E-PDCCH；

m∈{0，1，……，M^(L)-1} representing the mth E-PDCCH candidate in the localized E-PDCCH candidate set;

N_eCCErepresenting the number of E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the localized E-PDCCH;

M^(L)representing the number of E-PDCCH candidates of the localized E-PDCCH candidate set;

offset^(L)an offset parameter representing a starting position of the localized E-PDCCH candidate set;

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]represents the starting E-CCE number of the mth E-PDCCH candidate in the localized E-PDCCHcandidate set;

i is {0, … … L-1}, and represents the number of E-CCEs of a localized E-PDCCH that is occupied by one E-PDCCH candidate in the localized E-PDCCH candidate set after the starting E-CCE.

9. The method of claim 3, wherein if the difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at aggregation level L is the least common multiple of the aggregation level L and the number K of the E-CCEs corresponding to one PRB pair, the E-CCEs of the localized E-PDCCH candidates occupied by each E-PDCCH candidate in the corresponding localized E-PDCCH candidate set at aggregation level L have the following numbers:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+i，

wherein S is₀Representing the E-CCE number corresponding to the starting position of the time-frequency resource which can be used for transmitting the E-PDCCH;

N_eCCErepresenting localized E-PDCCH corresponding to the time-frequency resource available for transmitting localized E-PDCCHThe number of E-CCEs;

i is {0, … … L-1}, and represents the number of E-CCEs of a localized E-PDCCH that is occupied by one E-PDCCH candidate in the localized E-PDCCH candidate set after the initial E-CCE;

q represents the least common multiple of L and K.

10. A method for determining time-frequency resources of distributed E-PDCCH is characterized by comprising the following steps:

11. The method of claim 10, wherein a distributed E-PDCCH candidate of a corresponding distributed E-PDCCH candidate set at an aggregation level occupies a time-frequency resource that is a combination of some or all of the time-frequency resources occupied by each E-PDCCH candidate in a plurality of E-PDCCH candidates of a corresponding localized E-PDCCH candidate set at an aggregation level L.

12. A method for transmitting an E-PDCCH is characterized by comprising the following steps:

13. The method of claim 12, wherein:

14. The method of claim 13, wherein the absolute difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at an aggregation level is equal to:

or,

15. The method of claim 12 or 13, further comprising:

the terminal determines the number of E-PDCCH candidates in a localized E-PDCCH candidate set corresponding to each aggregation level according to the convention with the network side equipment;

or,

and the terminal receives the number of the E-PDCCH candidates in the corresponding localized E-PDCCH candidate set in each aggregation level sent by the network side equipment.

16. The method according to claim 12 or 13, wherein determining the number of E-CCEs occupying localized E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level comprises:

and the terminal determines the number of the E-CCEs of the localized E-PDCCH occupying the localized E-PDCCH in the localized E-PDCCH candidate set corresponding to each aggregation level according to the number of the E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe, the number of the E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level and the initial position of the localized E-PDCCH candidate set corresponding to each aggregation level.

17. The method of claim 16, further comprising:

the terminal determines the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the RNTI of the terminal in a mode appointed by the network side equipment;

and the terminal determines the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter.

18. The method of claim 16, further comprising:

the terminal receives the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level sent by the network side equipment;

the terminal determines the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter;

or,

the terminal receives an offset parameter of the initial position of a corresponding localized E-PDCCH candidate set at an aggregation level sent by the network side equipment;

the terminal determines the offset parameters of the initial positions of the corresponding localized E-PDCCH candidate sets under other aggregation levels according to the preset offset parameter association information;

and the terminal determines the initial position of the localized E-PDCCH candidate set corresponding to each aggregation level according to the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to each aggregation level.

19. The method of claim 14, wherein if a difference in E-CCE numbering between any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at aggregation level L is an integer multiple of the aggregation level to which the localized E-PDCCH candidate set corresponds, the E-CCE numbering of the localized E-PDCCH occupied by each E-PDCCH candidate in the corresponding localized E-PDCCH candidate set at aggregation level L is as follows:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i，

20. The method of claim 14, wherein if a difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at aggregation level L is the least common multiple of the aggregation level L and the number K of E-CCEs corresponding to one PRB pair, the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH candidate in the corresponding localized E-PDCCH candidate set at aggregation level L have the following numbers:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+i，

q represents the least common multiple of L and K.

21. A method for determining time-frequency resources of distributed E-PDCCH is characterized by comprising the following steps:

22. The method of claim 21, wherein a distributed E-PDCCH candidate of a corresponding distributed E-PDCCH candidate set at an aggregation level occupies a time-frequency resource that is a combination of some or all of the time-frequency resources occupied by each E-PDCCH candidate in a plurality of E-PDCCH candidates of a corresponding localized E-PDCCH candidate set at an aggregation level L.

23. A network-side device, comprising:

24. The network-side device of claim 23, wherein:

25. The network-side device of claim 24, wherein the absolute value of the difference between the numbers of the starting E-CCEs between any two adjacent E-PDCCHs candidate in the localized E-PDCCH candidate set corresponding to the aggregation level is equal to:

or,

26. The network-side device according to claim 23 or 24, wherein the network-side device further comprises:

a first E-PDCCH candidate number configuration module, configured to determine, according to the agreement with the terminal, the number of E-PDCCHcandidates in the localized E-PDCCH candidate set corresponding to each aggregation level;

or,

and the second E-PDCCH candidate number configuration module is used for determining the number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level and sending the determined number of E-PDCCH candidates in the localized E-PDCCH candidate set corresponding to each aggregation level to the terminal.

27. The network-side device of claim 23 or 24, wherein the localized E-PDCCH search space determining module is specifically configured to determine, according to a number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that the terminal may use to transmit the E-PDCCH in a current subframe, a number of E-PDCCHs candidate in a localized E-PDCCH candidate set corresponding to each aggregation level, and a starting position of a localized E-PDCCH candidate set corresponding to each aggregation level, a number of E-CCEs of the localized E-PDCCH candidate set occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level.

28. The network-side device of claim 27, wherein the network-side device further comprises:

a starting position configuration module of the first localized E-PDCCH candidate set, configured to determine, according to a manner agreed with the terminal, an offset parameter of a starting position of a corresponding localized E-PDCCH candidate set at each aggregation level according to an RNTI of the terminal; and determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter.

29. The network-side device of claim 27, wherein the network-side device further comprises:

a starting position configuration module of the second localized E-PDCCH candidate set, configured to determine, according to the RNTI of the terminal, an offset parameter of a starting position of the localized E-PDCCH candidate set corresponding to each aggregation level; determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter; sending the offset parameter of the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level to the terminal;

or,

a third localized E-PDCCH candidate set start position configuration module, configured to determine, according to predetermined offset parameter association information and the terminal RNTI, an offset parameter of a start position of a corresponding localized E-PDCCH candidate set in each aggregation level; determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter; and sending the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to one aggregation level to the terminal, so that the terminal determines the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to other aggregation levels according to the offset parameter correlation information.

30. The network-side device of claim 25, wherein if a difference between the starting E-CCEs of any two adjacent E-PDCCHs in the corresponding localized E-PDCCH candidate set at the aggregation level L is an integer multiple of the aggregation level corresponding to the localized E-PDCCH candidate set, the E-CCEs of localized E-PDCCHs occupied by each E-PDCCH candidate set at the corresponding localized E-PDCCH candidate set at the aggregation level L have the following numbers:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i，

offset^(L)represents the aboveOffset parameters of the starting position of the localized E-PDCCH candidate set;

31. The network-side device of claim 25, wherein if a difference between the starting E-CCEs of any two adjacent E-PDCCHs in the corresponding localized E-PDCCH candidate set at the aggregation level L is the least common multiple of the aggregation level L and the number K of E-CCEs corresponding to one PRB pair, the E-CCEs of localized E-PDCCHs occupied by each E-PDCCH candidate in the corresponding localized E-PDCCH candidate set at the aggregation level L have the following numbers:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+i，

i ═ 0, … … L-1, which indicates the number of localized E-CCEs occupied by one E-PDCCH localized after the starting E-CCE in the localized E-PDCCH localized set;

q represents the least common multiple of L and K.

32. A network-side device, comprising:

the localized E-PDCCH search space determining module is used for determining the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource which can be used for transmitting the E-PDCCH by a terminal in a current subframe, and the number of E-PDCCHcandials in a localized E-PDCCH candialate set corresponding to an aggregation level L, wherein each E-PDCCH candialate in the localized E-PDCCH candialate set corresponding to the aggregation level L occupies the number of the E-CCEs of the localized E-PDCCH, and the absolute value of the difference value of the number of the initial E-CCEs between any two adjacent E-PDCCH candialates in the localized E-PDCCH candialate set is equal;

the distributed E-PDCCH search space determining module is used for determining time-frequency resources occupied by a corresponding frequency-domain discontinuous transmission distributed E-PDCCH candidate set of the terminal under an aggregation level L according to the time-frequency resources occupied by the corresponding localized E-PDCCH candidate set of the terminal under the aggregation level L, the time-frequency resources occupied by the corresponding distributed E-PDCCH candidate set under the aggregation level L are all or part of the time-frequency resources occupied by the corresponding localized E-PDCCH candidate set under the aggregation level L, and the time-frequency resources occupied by the corresponding localized E-PDCCH candidate set under the aggregation level L refer to the time-frequency resources occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set occupying the time-frequency resources corresponding to the E-CCEs of the localized E-PDCCHs.

33. The network-side device of claim 32, wherein a distributed E-PDCCH candidate of a distributed E-PDCCH candidate set corresponding to an aggregation level occupies time-frequency resources that are a combination of partial or all time-frequency resources occupied by each E-PDCCH candidate in a plurality of E-PDCCH candidates of a localized E-PDCCH candidate set corresponding to an aggregation level L.

34. A terminal, comprising:

35. The terminal of claim 34, wherein:

36. The terminal of claim 35, wherein the absolute difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at an aggregation level is equal to:

or,

37. The terminal according to claim 34 or 35, characterized in that the terminal further comprises:

a first E-PDCCH candidate number configuration module, configured to determine, according to an agreement with the network side device, the number of E-PDCCHs in a localized E-PDCCH candidate set corresponding to each aggregation level;

or,

and a second E-PDCCH candidate number configuration module, configured to receive the number of E-PDCCHs in the localized E-PDCCH candidate set corresponding to each aggregation level sent by the network side device.

38. The terminal according to claim 34 or 35, wherein the localized E-PDCCH search space determining module is specifically configured to determine, according to a number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that the terminal can use to transmit an E-PDCCH in a current subframe, a number of E-PDCCHs in a localized E-PDCCH candidate set corresponding to each aggregation level, and a starting position of a localized E-PDCCH candidate set corresponding to each aggregation level, a number of E-CCEs of the localized E-PDCCH candidate set occupied by each E-PDCCH candidate in the localized E-PDCCH candidate set corresponding to each aggregation level.

39. The terminal of claim 38, wherein the terminal further comprises:

a starting position configuration module of the first localized E-PDCCH candidate set, configured to determine, according to a manner agreed with the network side device, an offset parameter of a starting position of the localized E-PDCCH candidate set corresponding to each aggregation level according to the RNTI of the terminal; and determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter.

40. The terminal of claim 38, wherein the terminal further comprises:

a starting position configuration module of the second localized E-PDCCH candidate set, configured to receive an offset parameter of a starting position of the corresponding localized E-PDCCH candidate set in each aggregation level sent by the network side device; determining the initial position of the corresponding localized E-PDCCH candidate set under each aggregation level according to the offset parameter;

or,

a third localized E-PDCCH candidate set start position configuration module, configured to receive an offset parameter of a start position of a corresponding localized E-PDCCH candidate set in an aggregation level sent by the network side device; determining offset parameters of the initial positions of the corresponding localized E-PDCCH candidate sets under other aggregation levels according to the preset offset parameter association information; and determining the initial position of the localized E-PDCCH candidate set corresponding to each aggregation level according to the offset parameter of the initial position of the localized E-PDCCH candidate set corresponding to each aggregation level.

41. The terminal of claim 36, wherein if a difference in starting E-CCE number between any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at aggregation level L is an integer multiple of the aggregation level corresponding to the localized E-PDCCH candidate set, then the E-CCE number of localized E-PDCCH occupied by each E-PDCCH candidate in the corresponding localized E-PDCCH candidate set at aggregation level L is:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]+i，

42. The terminal of claim 36, wherein if a difference between the starting E-CCEs of any two adjacent E-PDCCH candidates in the corresponding localized E-PDCCH candidate set at aggregation level L is the least common multiple of the aggregation level L and the number K of E-CCEs corresponding to one PRB pair, then the E-CCEs of the localized E-PDCCH occupied by each E-PDCCH candidate in the corresponding localized E-PDCCH candidate set at aggregation level L have the following numbers:

S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+i，

m∈{0，1，……，M^(L)-1} representing the m-th E-PDCCH in the localized E-PDCCH candidate setcandidate；

q represents the least common multiple of L and K.

43. A terminal, comprising:

44. The terminal of claim 43, wherein a distributed E-PDCCH candidate of a corresponding distributed E-PDCCH candidate set at an aggregation level occupies time-frequency resources of a combination of partial or all time-frequency resources occupied by each E-PDCCH candidate in a plurality of E-PDCCH candidates of a corresponding localized E-PDCCH candidate set at an aggregation level L.