CN103391626B

CN103391626B - The transmission method of E-PDCCH, running time-frequency resource defining method and device

Info

Publication number: CN103391626B
Application number: CN201210147819.1A
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: 2016-03-23
Anticipated expiration: 2032-05-10
Also published as: CN103391626A; WO2013166980A1

Abstract

The invention discloses the transmission method of a kind of E-PDCCH, running time-frequency resource defining method and device.Does its transmission method comprise: localized corresponding under determining often kind of polymerization grade? each E-PDCCH in E-PDCCH candidate collection? does candidate take localized? the numbering of the E-CCE of E-PDCCH, a localized? two E-PDCCH of arbitrary neighborhood in E-PDCCH candidate collection? the absolute value of the numbering difference of the initial E-CCE between candidate is equal; Localized corresponding under various polymerization grade? one or more E-PDCCH is selected in E-PDCCH candidate collection? the running time-frequency resource of candidate sends E-PDCCH to terminal.Do you make localized? E-PDCCH obtains better frequency selective scheduling.

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 a 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 CCEs to REGs (resource element groups) employs a fully interleaved approach.

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 a value of 1, 2, 4, and 8 in an LTE system, which is referred to as CCE aggregation level (aggregate 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 DCIformat (format) and CCE aggregation level, 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 resource refers to a time-frequency resource occupied by a PDCCHcandidate. In the present invention, the search space can also be described as a PDCCHcandidate set. Taking the UESS with CCE aggregation level 1 in fig. 2 as an example, 6 pdccchhcandidates are included in the corresponding PDCCHcandidate set.

TABLE 1

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

A physical downlink control channel (R-PDCCH) for a Relay system is defined in the lte rel-10 system, 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 PRBpair (physical resource block pair) resources occupied by the PRBpair 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 DLgrant (downlink grant) and the ULgrant (uplink grant) are transmitted by TDM (Time-division multiplexing):

the DLgrant is transmitted in the first slot, and in the first slot, Relay detects DCIformat (format) 1A and a DCIformat associated with the transmission mode.

The ULgrant is transmitted in the second slot. In the second slot, Relay detects the dciformmat 0 and a dciformmat 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 LTEREl-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 VRB (virtual resource block, discrete virtual physical resource block) with 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 PRBpair. In the distributed transmission mode, one E-PDCCH transmitted to one UE occupies resources in four PRBpair.

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-PDCCHblocking 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 PRBpair contains the minimum resource granularity of a plurality of E-PDCCH search spaces, such as E-CCE (enhanced CCE), and the 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 more severely than the channel between the Relay and the base station, and the E-PDCCHcandidate of the UE needs to cover more PRBpair resources as much 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 a localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate set corresponding to each aggregation level according to the number of 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 E-PDCCHcandidates in the localized E-PDCCHcandidate 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-PDCCHcadidates in the localized E-PDCCHcandidate set corresponding to one aggregation level are equal;

the network side equipment selects one or more E-PDCCHcandials from a corresponding localized E-PDCCHcandials set under various aggregation levels, and sends the E-PDCCH to the terminal by occupying a time-frequency resource corresponding to the E-CCE of the localized E-PDCCH by the selected E-PDCCHcandials.

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 a localized E-PDCCH occupied by each E-PDCCHcandidate in a localized E-PDCCHcandidate set corresponding to an aggregation level L according to the number of the E-CCEs of the 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 the E-PDCCHcandidates in the localized E-PDCCHcandidate 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-PDCCHcandidates in the localized E-PDCCHcandidate set are equal;

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

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

the terminal determines the number of E-CCEs of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate 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 and the number of the E-PDCCHcandidates in the localized E-PDCCHcandidate 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-PDCCHcadates in the localized E-PDCCHcandidate set corresponding to one aggregation level are equal;

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

the terminal determines the number of E-CCEs of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate 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-PDCCHcandidates in the localized E-PDCCHcandidate 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-PDCCHcandidates in the localized E-PDCCHcandidate set are equal;

the terminal determines time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under an aggregation level according to the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under the aggregation level L, the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under the aggregation level are all or part of the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under the aggregation level L, and the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under the aggregation level L refer to the time-frequency resources occupied by each E-PDCCHcandidate in the distributed E-PDCCHcandidate set occupying the corresponding E-CCEs of the distributed E-PDCCHcandidate.

A network-side device, comprising:

a localized E-PDCCH search space determining module, configured to determine, according to the number of E-CCEs used by a terminal to continuously transmit a 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-PDCCHscan candidates in a localized E-PDCCH candidate scan set corresponding to each aggregation level, the number of E-CCPCscan candidates occupying the localized E-CCEs of the localized E-PDCCH in each aggregation level corresponding to the localized E-PDCCHscan set, and the absolute value of the difference in the numbers of starting E-CCEs between any two adjacent E-PDCCHscan candidates in the localized E-PDCCHscan set corresponding to one aggregation level, are equal to each other;

and the E-PDCCH sending module is used for selecting one or more E-PDCCHcandials from the corresponding localized E-PDCCHcandials under various aggregation levels and sending the E-PDCCH to the terminal by using the selected E-PDCCHcandials 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 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 in a current subframe, determining the number of the E-CCPCcandidates of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate set corresponding to each aggregation level, wherein the absolute value of the difference value of the number of the initial E-CCEs between any two adjacent E-PDCCHcadicadidates in the localized E-PDCCHcandidate set corresponding to one aggregation level is equal;

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-PDCCHcandidate in the localized E-PDCCHcandidate set corresponding to at least one aggregation level.

A terminal, comprising:

a localized E-PDCCH search space determining 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 the E-PDCCH in a current subframe and the number of E-PDCCHcandials in a localized E-PDCCHcandialate set corresponding to an aggregation level L, that each E-PDCCHcandials in the localized E-PDCCHcandialate set corresponding to the aggregation level L occupies the number of the E-CCEs of the localized E-PDCCH, and that an absolute value of a difference between the numbers of the initial E-CCEs between any two adjacent E-PDCCHcandials in the localized E-PDCCHcandialate set is equal;

the distributed E-PDCCH search space determining module is used for determining time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under an aggregation level L according to the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set of the terminal under the aggregation level L, the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under the aggregation level L are all or part of the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under the aggregation level L, and the time-frequency resources occupied by the corresponding distributed E-PDCCHcandidate set under the aggregation level L mean that each E-PDCCHcadate in the distributed E-PDCCHcadate set occupies the time-frequency resources corresponding to the E-CCCCEs of the distributed E-PDCCHcadicaridates.

Before E-PDCCH transmission, the E-CCEs of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate set corresponding to each aggregation level are configured for the terminal, namely the terminal is configured with a search space (UESS) of the localized E-PDCCH. 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. 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-PDCCHcandidate 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-PDCCHcandidate 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-PDCCHcandidate 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 determining method for a terminal-side distributed e-PDCCH 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 equipment determines the number of E-CCEs of localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate 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-PDCCHcandidates in the localized E-PDCCHcandidate 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-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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 can use to transmit the E-PDCCH.

The number of E-CCEs occupying the localized E-PDCCH in each E-PDCCHcanddate set corresponding to the aggregation level L is L. Correspondingly, the number of the E-CCEs of the localized E-PDCCH occupied by one E-PDCCHcandidate in the corresponding localized E-PDCCHcandidate set under the aggregation level L means that the E-PDCCHcandidate occupies the numbers of the L E-CCEs of the localized E-PDCCH.

Step 110, the network side device selects one or more E-PDCCHs from the localized E-PDCCHs candidate set corresponding to each aggregation level, and sends 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-PDCCHs candidate.

Before the E-PDCCH is sent to the terminal, the method allocates E-CCEs of localized E-PDCCHcandials occupied by each E-PDCCHcandialate in the localized E-PDCCHcandialate set corresponding to each aggregation level to the terminal, namely allocates search spaces (UESS) of the localized E-PDCCH to the terminal. 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 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 positioned in one PRBpair. 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 PRBpair, 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 PRBpair for E-PDCCH is 1, 5, 15 and 30, and one PRBpair corresponds to the E-CCEs of 4 localized E-PDCCH, so that the E-CCEs of 16 localized E-PDCCH can be used for transmitting the E-PDCCH and are numbered 0-15. The time-frequency resources corresponding to the E-CCEs for localized E-PDCCHs numbered 1 and 2 are inside PRBpair 1. The time-frequency resources corresponding to the E-CCEs of the localized E-PDCCH numbers 3 and 4 are respectively located at the ending position of PRBpair1 and the starting position of PRBpair2, namely located in the adjacent VRB.

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

The above-mentioned absolute values of the number difference of the starting E-CCE between any two adjacent E-pdcchcandiales in the corresponding localized E-pdcchcandiale set at one aggregation level may specifically be: the difference value of the number of the initial E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under an aggregation grade is the least common multiple of the aggregation grade corresponding to the localized E-PDCCHcandials set and the number K of the E-CCEs corresponding to one PRBpair.

It should be noted that the interval between any two adjacent E-PDCCHcandidates in one localized E-PDCCHcandidate set is not limited to the above two cases, as long as the E-PDCCHcandidates in one localized E-PDCCHcandidate set are discontinuous and the interval between two adjacent E-PDCCHcandidates 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-pdcchcandidates in the localized E-PDCCHcandidate 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-PDCCHcandidates in a corresponding localized E-PDCCHcandidate set under each aggregation level according to the convention with the terminal; or, the network side device determines the number of E-pdcchcandidates in the localized E-PDCCHcandidate set corresponding to each aggregation level, and sends the determined number of E-pdcchcandidates in the localized E-PDCCHcandidate 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 occupying the localized E-PDCCH in the localized E-PDCCCendate 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-PDCCHendates in the localized E-PDCCHendate set corresponding to each aggregation level and the initial position of the localized E-PDCCHendate set corresponding to each aggregation level.

The starting position of the localized E-PDCCHcandidate set corresponding to the aggregation level L is the starting E-CCE number of the localized E-PDCCHcandidate set corresponding to the aggregation level L on the time-frequency resource available 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 the initial position of a corresponding localized E-PDCCHcandidate 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-PDCCHcandidate set in each aggregation level according to the offset.

The specific implementation manner of determining the offset of the starting position of the corresponding localized e-PDCCHcandidate set in each aggregation level according to the RNTI of the terminal in the manner agreed with the terminal may be, but is not limited to, that: determining offset of the initial position of the corresponding localized E-PDCCHcandidate 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-PDCCHcandidate set at 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-PDCCHcandidate set in each aggregation level according to the RNTI of the terminal; determining the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade according to the offset; and sending the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set at each aggregation level to the terminal. For a specific implementation manner of determining the offset of the starting position of the corresponding localized e-PDCCHcandidate 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-PDCCHcandidate set in each aggregation level according to the preset offset parameter related information and the RNTI of the terminal; determining the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade according to the offset; and sending the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set in one aggregation level to the terminal, so that the terminal determines the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set in 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-PDCCHcandidate 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 the association relationship between the offsets of the starting positions of the corresponding localized e-PDCCHcandidate sets at various aggregation levels.

And if the number difference of the starting E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under the aggregation level L is an integral multiple of the aggregation level corresponding to the localized E-PDCCHcandials set. Preferably, the number of E-CCEs of localized E-PDCCH occupied by each E-PDCCHcandidate in the corresponding localized E-PDCCHcandidate set at 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 starting position of the time-frequency resource which can be used for transmitting the E-PDCCH can be defaulted to 0, M ∈ {0, 1, … …, M^(L)-1, representing the mth E-PDCCHcandidate in the localized E-PDCCHcandidate 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)Represents the number of E-PDCCHcandidates of the localized E-PDCCHcandidate set; offset^(L)An offset parameter indicating a starting position of the localized E-PDCCHcandidate set; s₀+offset^(L)A number indicating a starting E-CCE corresponding to a starting position of the localized E-PDCCHcandidate set; s₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/L)·L]Represents the starting E-CCE number of the mth E-PDCCHcandidate in the localized E-PDCCHcandidate set; i ═ 0, … … L-1, which indicates the number of E-CCEs of localized E-PDCCH occupied by one E-PDCCHcandidate in the localized E-PDCCHcandidate set after the starting E-CCE.

If the difference of the starting E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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 PRBpair, the number of the E-CCEs of the localized E-PDCCHcandials occupied by each E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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 starting position of the time-frequency resource which can be used for transmitting the E-PDCCH can be defaulted to 0, M ∈ {0, 1, … …, M^(L)-1, representing the mth E-PDCCHcandidate in the localized E-PDCCHcandidate 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)Represents the number of E-PDCCHcandidates of the localized E-PDCCHcandidate set; offset^(L)An offset parameter indicating a starting position of the localized E-PDCCHcandidate set; s₀+offset^(L)A number indicating a starting E-CCE corresponding to a starting position of the localized E-PDCCHcandidate set; s₀+offet^(L)·L+m·[floor(NeCCE/M^(L)/L)·L]Represents the starting E-CCE number of the mth E-PDCCHcandidate in the localized E-PDCCHcandidate set; i ═ 0, … … L-1, which indicates the number of E-CCEs of localized E-PDCCH occupied by one E-pdcchcanddate in the localized E-pdcchcanddate set after the starting E-CCE; 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 PRBpair, and each PRBpair corresponds to 4E-CCE. Offset for UE1⁽¹⁾0, offset of UE2⁽¹⁾Is 2. The number of E-PDCCHcandidates in the corresponding localized E-PDCCHcandidate set of the UE1 under the aggregation level 1 and the aggregation level 2 is 6. The number of E-PDCCHcandidates in the corresponding localized E-PDCCHcandidate set of the UE1 under the aggregation level 1 and the aggregation level 2 is 6. Then, according to the above formula S₀+offset^(L)·L+m·[floor(N_eCCE/M^(L)/Q)·Q]+ i is the corresponding localized E-PDCCHcandidate set at aggregation level 1 and aggregation level 2 determined by UE1The number of E-CCEs in the localized E-PDCCH occupied by each E-PDCCHcandidate, and the number of E-CCEs in the localized E-PDCCH occupied by each E-PDCCHcandidate in the corresponding localized E-pdcchcanddate set at 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 UE1 start point refers to the start position of the corresponding localized e-PDCCHcandidate set at the corresponding aggregation level for UE 1. Each PRBpair may be discontinuous in the frequency domain, but the corresponding VRB is continuous.

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

step 200, the network side equipment determines the number of the E-CCEs of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate 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-PDCCHcandidates in the localized E-PDCCHcandidate 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-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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-PDCCHcandidate in the corresponding localized E-PDCCHcandidate set occupies the E-CCE of the localized E-PDCCH at each aggregation level, which is not described herein again.

Step 210, the network side device determines, according to the time-frequency resource occupied by the localized e-PDCCHcandidate set corresponding to the terminal in the aggregation level L, the time-frequency resource occupied by the frequency-domain discontinuous transmission distributed e-PDCCHcandidate set corresponding to the terminal in one 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. For example, the time-frequency resources occupied by the distributed e-PDCCHcandidate set corresponding to aggregation level 2 are the same as the time-frequency resources occupied by the localized e-PDCCHcandidate set corresponding to aggregation level 1, or are a subset of the time-frequency resources occupied by the localized e-PDCCHcandidate set corresponding to aggregation level 1.

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

Because 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 resources of the distributed E-PDCCH search space determined for the terminal inherit the advantages of configuration of the localized E-PDCCH search space, 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 PRBpair corresponding to the E-CCE of one distributed E-PDCCH. Correspondingly, the time-frequency resource occupied by one distributed E-PDCCHcandidate of the distributed E-PDCCHcandidate set corresponding to the aggregation level L is the combination of partial or all time-frequency resources occupied by each E-PDCCHcandidate in a plurality of E-PDCCHcadidates of the localized E-PDCCHcandidate set corresponding to the aggregation level L.

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

Wherein, the time-frequency resources occupied by the corresponding localized E-PDCCHcandidate set under the aggregation level 1 are distributed on 8 PRBpair, and each PRBpair corresponds to the E-CCE of 4 localized E-PDCCH. These 8 PRBpair may be discontinuous in the frequency domain, but the corresponding VRBs are continuous.

For the corresponding distributed E-PDCCHcandidate set at aggregation level L (L ═ 2, 4, 8), the time-frequency resource distribution occupied by E-PDCCHcandidate is as shown in fig. 9. Taking E-PDCCHcandidate1 in the distributed E-PDCCHcandidate set corresponding to the aggregation level 2 as an example, the time-frequency resources occupied by the E-PDCCHcandidate1 may be part or all of the time-frequency resources occupied by E-PDCCHcandidate1 and part or all of the time-frequency resources occupied by E-PDCCHcandidate5 in the localized E-PDCCHcandidate set corresponding to the aggregation level 1.

The value of the polymerization level L may also be 1. For the distributed E-PDCCHcandidate set corresponding to aggregation level 1, if one E-CCE includes multiple E-REGs, the time-frequency resources occupied by the E-PDCCHcandidate may be obtained by direct reasoning with reference to the time-frequency resource distribution occupied by the E-PDCCHcandidate in the distributed E-PDCCHcandidate set corresponding to aggregation level 2, and details are not described 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 the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate 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 and the number of the E-PDCCHcandidates in the localized E-PDCCHcandidate set corresponding to each aggregation level;

wherein the absolute value of the number difference of the starting E-CCEs between any two adjacent E-PDCCHcandials in one localized E-PDCCHcandials set is 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-PDCCHcandidate in the localized E-PDCCHcandidate 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-PDCCHcandidate in the localized E-PDCCHcandidate set corresponding to each aggregation level is determined, namely the search space (UESS) of the localized E-PDCCH of the terminal 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 transmission method of the E-PDCCH on the terminal side, for a specific mapping relationship between an E-CCE of a localized E-PDCCH and a time-frequency resource that can be used by the terminal for transmitting the E-PDCCH in a current subframe, a specific meaning that an absolute value of a difference between starting E-CCEs of any two adjacent E-PDCCHs in one localized E-PDCCHcandidate set is equal, a definition of an offset parameter of a starting position of a corresponding localized E-PDCCHcandidate set in an aggregation level, and the like, reference is made to descriptions of various embodiments of the network-side device method, and details are not repeated herein.

In the present invention, the terminal also predetermines the number of E-pdcchcandidates in the localized E-PDCCHcandidate 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-PDCCHcandidates in a corresponding localized E-PDCCHcandidate set under each aggregation level according to the convention with the network side equipment; or, the terminal receives the number of E-PDCCHcandidate sets in the corresponding localized E-PDCCHcandidate set for 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 E-CCEs of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate 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 E-PDCCHcandidates in the localized E-PDCCHcandidate set corresponding to each aggregation level and the initial position of the localized E-PDCCHcandidate set corresponding to each aggregation level.

Correspondingly, the method provided by the invention can further comprise the following steps: the terminal determines an offset parameter of the initial position of a corresponding localized E-PDCCHcandidate set under each aggregation level according to the RNTI of the terminal in a mode appointed 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. . 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 an offset parameter of the initial position of a corresponding localized E-PDCCHcandidate set in 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-PDCCHcandidate set under an aggregation level sent by the network side equipment; determining offset parameters of the initial positions of corresponding localized E-PDCCHcandidate sets under other aggregation levels according to the determined offset parameter correlation information; and determining the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade according to the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade.

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-PDCCHcandidate in the localized E-PDCCHcandidate 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-PDCCHcandidates in the localized E-PDCCHcandidate set corresponding to the aggregation level L.

The specific implementation manner of step 400 may refer to each embodiment of the above-mentioned E-PDCCH transmission method, and the terminal determines the specific implementation manner that each E-PDCCHcandidate in the localized E-PDCCHcandidate 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-PDCCHcandidate set corresponding to the aggregation level according to the time frequency resources occupied by the corresponding localized E-PDCCHcandidate set corresponding to the aggregation level L.

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.

Because 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 resources of the distributed E-PDCCH search space determined by the terminal inherit the advantages of configuration of the localized E-PDCCH search space, 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-PDCCHcandidate of the distributed E-PDCCHcandidate set corresponding to the aggregation level L is the combination of partial or all time-frequency resources occupied by each E-PDCCHcandidate in a plurality of E-PDCCHcadidates of the localized E-PDCCHcandidate 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-PDCCHcandidate sets in a localized E-PDCCH candidate set corresponding to each aggregation level, a number of E-CCEs that each E-PDCCHcandidate in the localized E-PDCCH set corresponding to each aggregation level occupies the localized E-PDCCH. Wherein, the absolute values of the number difference values of the starting E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under one aggregation level are equal.

An E-PDCCH sending module 1002, configured to select one or more E-PDCCHs in a localized E-PDCCHs candidate set corresponding to each aggregation level, 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-PDCCHs candidate.

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 the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate set corresponding to each aggregation level to the terminal, namely allocates the search space (UESS) of the localized E-PDCCH to the terminal. 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.

The network side device may further include a first E-PDCCHcandidate number configuration module, configured to determine, according to the agreement with the terminal, the number of E-pdcchcandidates in a localized E-PDCCHcandidate set corresponding to each aggregation level; or, the second E-PDCCHcandidate number configuration module is configured to determine the number of E-pdcchcandidates in the localized E-PDCCHcandidate set corresponding to each aggregation level, and send the determined number of E-pdcchcandidates in the localized E-PDCCHcandidate 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 in a localized E-pdcchondidate set corresponding to each aggregation level, and an initial position of a localized E-pdcchondidate set corresponding to each aggregation level, a number of E-CCEs of the localized E-PDCCH set occupied by each E-pdcchondidate in the localized E-pdcchondidate set corresponding to each aggregation level.

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

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

If the difference of the starting E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under the aggregation level L is an integral multiple of the aggregation level corresponding to the localized E-PDCCHcandials set, the number of the E-CCEs of the localized E-PDCCHcandials occupied by each E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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.

If the difference between the starting E-CCEs of any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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 PRBpair, the number of the E-CCEs of the localized E-PDCCHcandials occupied by each E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under the aggregation level L can be expressed by the following formula:

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:

the localized E-PDCCH search space determining module 2001 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-PDCCHcandialate set corresponding to the aggregation level L, the number of E-CCCCEs of the localized E-PDCCH occupied by each E-PDCCHcandials in the localized E-PDCCHcandialate 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-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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-PDCCHcandidate set corresponding to the terminal in an aggregation level L, a time-frequency resource occupied by a frequency-domain discontinuous transmission distributed e-PDCCHcandidate 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 corresponding localized E-PDCCHcandidate set under the aggregation level L refers to the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate set.

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

the localized E-PDCCH search space determining module 3001 is configured to determine, according to the number of E-CCEs of the localized E-PDCCH corresponding to the time-frequency resource that may be used to transmit the E-PDCCH in the current subframe and the number of E-PDCCHs in the localized E-PDCCHs set corresponding to each aggregation level, the number of E-CCEs of the localized E-PDCCH occupied by each E-PDCCHs in the localized E-PDCCHs 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-PDCCHcandials in the corresponding localized E-PDCCHcandials set under 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-PDCCHcandidate in a localized E-PDCCHcandidate set corresponding to at least one aggregation level.

Before receiving the E-PDCCH, the terminal determines that each E-PDCCHcandidate in a corresponding localized E-PDCCHcandidate set under each aggregation level occupies the E-CCE of the localized E-PDCCH, namely determines the search space (UESS) of the localized E-PDCCH of the terminal. 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.

The terminal provided by the invention also comprises a first E-PDCCHcandidate number configuration module, which is used for determining the number of E-PDCCHcandidates in a corresponding localized E-PDCCHcandidate set under 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-PDCCHcandidate sets in the localized E-PDCCHcandidate 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 in a localized E-pdcchondidate set corresponding to each aggregation level, and an initial position of a localized E-pdcchondidate set corresponding to each aggregation level, a number of E-CCEs of the localized E-PDCCH occupying the localized E-CCEs of the localized E-PDCCH set corresponding to each aggregation level.

Correspondingly, the terminal may further include a starting position configuration module of the first localized e-PDCCHcandidate set, configured to determine, according to the RNTI of the terminal, an offset parameter of the starting position of the localized e-PDCCHcandidate 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 location configuration module of a second localized e-PDCCHcandidate set, configured to receive an offset parameter of a starting location of a corresponding localized e-PDCCHcandidate set in each aggregation level sent by 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 location configuration module of a third localized e-PDCCHcandidate set, configured to receive an offset parameter of a starting location of a corresponding localized e-PDCCHcandidate set in an aggregation level sent by the network side device; determining offset parameters of the initial positions of corresponding localized E-PDCCHcandidate sets under other aggregation levels according to preset offset parameter correlation information; and determining the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade according to the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade.

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-PDCCHcandialate set corresponding to an aggregation level L, a number of E-CCCCEs that each E-PDCCHcandialate in the localized E-PDCCHcandialate set corresponding to the aggregation level L occupies the E-CCEs of the localized E-PDCCH. Wherein, the absolute values of the number difference values of the initial E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under the aggregation level L are equal.

The distributed e-PDCCH search space determination module 4002 is configured to determine, according to the time-frequency resource occupied by the localized e-PDCCHcandidate set corresponding to the terminal in the aggregation level L, the time-frequency resource occupied by the distributed e-PDCCHcandidate set corresponding to the terminal in one 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 corresponding localized E-PDCCHcandidate set under the aggregation level L refers to the time-frequency resource corresponding to the E-CCE of the localized E-PDCCH occupied by each E-PDCCHcandidate in the localized E-PDCCHcandidate 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 method comprises the steps that network side equipment determines the absolute value of the difference value of the starting E-CCEs of the localized E-PDCCHridate occupied by each E-PDCCHridate in the localized E-PDCCHridate set corresponding to each aggregation level according to the number of the E-CCEs of the enhanced control channel unit of the frequency domain continuous transmission localized E-PDCCH corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH by a terminal in a current subframe, the number of the E-PDCCHridate in the localized E-PDCCHridate set corresponding to each aggregation level and the starting position of the localized E-PDCCHridate set corresponding to each aggregation level, and the starting E-CCEs of any two adjacent E-PDCCHridates in the localized E-PDCCHridate set corresponding to one aggregation level are 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 PRBpair.

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

the number difference of the initial E-CCEs between any two adjacent E-PDCCHcandials in a corresponding localized E-PDCCHcandials set under an aggregation grade is an integral multiple of the aggregation grade corresponding to the localized E-PDCCHcandials set;

or,

the difference value of the number of the initial E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set under an aggregation grade is the least common multiple of the aggregation grade corresponding to the localized E-PDCCHcandials set and the number K of the E-CCEs corresponding to one PRBpair.

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-PDCCHcandidates in a corresponding localized E-PDCCHcandidate set under each aggregation level according to the convention with the terminal;

or,

and the network side equipment determines the number of E-PDCCHcandidates in the corresponding localized E-PDCCHcandidate set under each aggregation level, and sends the determined number of E-PDCCHcandidates in the corresponding localized E-PDCCHcandidate set under each aggregation level to the terminal.

5. The method of claim 1, further comprising:

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

6. The method of claim 1, further comprising:

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

the network side equipment determines the initial position of a corresponding localized E-PDCCHcandidate 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-PDCCHcandidate 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-PDCCHcandidate 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 corresponding localized E-PDCCHcandate set in one aggregation level to the terminal, so that the terminal determines the offset parameter of the initial position of the corresponding localized E-PDCCHcandate set in other aggregation levels according to the offset parameter correlation information.

7. The method of claim 3, wherein if the difference in the starting E-CCEs between any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set at the aggregation level L is an integer multiple of the aggregation level corresponding to the localized E-PDCCHcandials set, the E-CCEs of localized E-PDCCHcandials occupied by each E-PDCCHcandials in the corresponding localized E-PDCCHcandials set at the aggregation level L have the following numbering:

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-PDCCHcandidate of the localized E-PDCCHcandidate 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-PDCCHcandidates of the localizedE-PDCCHcandidate set;

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

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

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

8. The method of claim 3, wherein if the difference between the starting E-CCEs of any two adjacent E-PDCCHcandials in the corresponding localized E-PDCCHcandials set at 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 PRBpair, the E-CCEs of the localized E-PDCCHcandials occupied by each E-PDCCHcandials in the corresponding localized E-PDCCHcandials set at the aggregation level L have the following numbering:

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

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

q represents the least common multiple of L and K.

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

the network side equipment determines that each E-PDCCHcandidate in the localized E-PDCCHcandidate set corresponding to the aggregation level L occupies the number of the E-CCEs of the localized E-PDCCHcandidate set according to the number of the E-CCEs of the localized E-PDCCHondate 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-PDCCHcandidates in the localized E-PDCCHcandidate set corresponding to the aggregation level L and the initial position of the localized E-PDCCHcandidate set corresponding to the aggregation level L, and the absolute value of the difference of the numbers of the initial E-CCEs between any two adjacent E-PDCCHcandidates in the localized E-PDCCHcandicdate set is equal;

10. The method of claim 9, wherein a distributed E-PDCCHcandidate of a distributed E-PDCCHcandidate set corresponding to an aggregation level occupies a time-frequency resource that is a combination of a part or all of the time-frequency resources occupied by each E-PDCCHcandidate in a plurality of E-pdcchcandidates of a localized E-PDCCHcandidate set corresponding to an aggregation level L.

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

the terminal determines that the E-PDCCHcandials in the corresponding localized E-PDCCHcandials in each aggregation level occupy the numbers of the E-PDCCHs of the localized E-PDCCHcadials according to the number of the E-CCEs of the enhanced control channel units for continuously transmitting the localized E-PDCCHs in the frequency domain corresponding to the time-frequency resource which can be used for transmitting the E-PDCCH in the current subframe, the number of the E-PDCCHcandials in the corresponding localized E-PDCCHcandials in each aggregation level and the initial position of the corresponding localized E-PDCCHcandials in each aggregation level, and the absolute value of the difference of the numbers of the initial E-PDCCHs between any two adjacent E-PDCcadials in the corresponding localized E-PDCCHcadials in one aggregation level is equal;

12. The method of claim 11, wherein:

13. The method of claim 12, wherein the absolute value of the difference between the numbers of the starting E-CCEs between any two adjacent E-pdcchcandiales in the corresponding localized E-pdcchcandiale set at an aggregation level is equal to:

or,

14. The method of claim 11 or 12, further comprising:

the terminal determines the number of E-PDCCHcandidates in a corresponding localized E-PDCCHcandidate set under each aggregation level according to the convention with the network side equipment;

or,

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

15. The method of claim 11, further comprising:

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

16. The method of claim 11, further comprising:

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

the terminal determines the initial position of a corresponding localized E-PDCCHcandidate 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-PDCCHcandidate set under an aggregation level sent by the network side equipment;

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

and the terminal determines the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade according to the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set in each aggregation grade.

17. The method of claim 13, wherein if the difference in the starting E-CCE number between any two adjacent E-pdcchcandials in the corresponding localized E-pdcchcandiale set at aggregation level L is an integer multiple of the aggregation level to which the localized E-pdcchcandiale set corresponds, the E-CCE number of localized E-PDCCH occupied by each E-pdcchcandiale in the corresponding localized E-pdcchcandiale set at aggregation level L is:

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

18. The method of claim 13, wherein if the difference between the starting E-CCEs of any two adjacent E-pdcchcandials in the corresponding localized E-pdcchcandialate 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 PRBpair, then the E-CCE of the localized E-PDCCH occupied by each E-pdcchcandialate in the corresponding localized E-pdcchcandialate set at aggregation level L has the following number:

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

q represents the least common multiple of L and K.

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

the terminal determines the number of E-CCEs of the localized E-PDCCH occupied by each E-PDCCHcadiode in the localized E-PDCCHcadiode set corresponding to the aggregation level L according to the number of 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 E-PDCCHcadiodes in the localized E-PDCCHcadiode set corresponding to the aggregation level L and the initial position of the localized E-PDCCHcadiode set corresponding to the aggregation level L, and the absolute value of the difference of the number of the initial E-CCEs between any two adjacent E-PDCCHcadiodes in the localized E-PDCCHcadiode set is equal;

20. The method of claim 19, wherein a distributed E-PDCCHcandidate of a distributed E-PDCCHcandidate set corresponding to an aggregation level occupies a time-frequency resource that is a combination of a part or all of the time-frequency resources occupied by each E-PDCCHcandidate in a plurality of E-pdcchcandidates of a localized E-PDCCHcandidate set corresponding to an aggregation level L.

21. A network-side device, comprising:

the localized E-PDCCH search space determining module is used for determining that the absolute value of the difference value of the starting E-CCEs of any two adjacent E-PDCCHcadicates in the localized E-PDCCHcadicacid set corresponding to each aggregation level is equal 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-PDCCHcadicacid in the localized E-PDCCHcadicacid set corresponding to each aggregation level and the starting position of the localized E-PDCCHcadicacid set corresponding to each aggregation level;

22. The network-side device of claim 21, wherein:

23. The network-side device of claim 22, wherein the absolute value of the difference between the starting E-CCEs of any two adjacent E-pdcchcandialates in the corresponding localized E-pdcchcandialate set at an aggregation level is equal to:

or,

24. The network-side device according to claim 21 or 22, wherein the network-side device further comprises:

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

or,

and the second E-PDCCHcandidate number configuration module is used for determining the number of the E-PDCCHcandidates in the corresponding localized E-PDCCHcandidate set under each aggregation grade and sending the determined number of the E-PDCCHcandidates in the corresponding localized E-PDCCHcandidate set under each aggregation grade to the terminal.

25. The network-side device of claim 21, wherein the network-side device further comprises:

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

26. The network-side device of claim 21, wherein the network-side device further comprises:

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

or,

a third location configuration module of the localized e-PDCCHcandidate set, configured to determine, according to the predetermined offset parameter association information and the RNTI of the terminal, an offset parameter of the start location of the localized e-PDCCHcandidate set corresponding to 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 starting position of the corresponding localized E-PDCCHcandidate set in one aggregation level to the terminal, so that the terminal determines the offset parameter of the starting position of the corresponding localized E-PDCCHcandidate set in other aggregation levels according to the offset parameter correlation information.

27. The network-side device of claim 23, wherein if a difference between the starting E-CCEs of any two adjacent E-pdcchcandials in the corresponding localized E-pdcchcandialate set at aggregation level L is an integer multiple of the aggregation level corresponding to the localized E-pdcchcandialate set, the E-CCEs of localized E-pdcchcandialate occupied by each E-pdcchcandialate in the corresponding localized E-pdcchcandialate set at aggregation level L have the following numbers:

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

28. The network-side device of claim 23, wherein if a difference between the starting E-CCEs of any two adjacent E-pdcchcandials in the corresponding localized E-pdcchcandialate 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 PRBpair, then the E-CCEs of the localized E-PDCCH occupied by each E-pdcchcandialate in the corresponding localized E-pdcchcandialate 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 E-CCEs of localized E-PDCCH occupied by one E-pdcchcanddate in the localized E-pdcchcanddate set after the starting E-CCE;

q represents the least common multiple of L and K.

29. A network-side device, comprising:

a localized E-PDCCH search space determining module, configured to determine, according to the number of E-CCEs of a localized E-PDCCH corresponding to a time-frequency resource that a terminal may be used to transmit the E-PDCCH in a current subframe, the number of E-PDCCHcandials in a localized E-PDCCHcandiale set corresponding to an aggregation level L, and an initial position of a localized E-PDCCHcandiale set corresponding to the aggregation level L, that each E-PDCCHcandiale in the localized E-PDCCHcandiale 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 between the initial E-CCEs of any two adjacent E-PDCCHcadiales in the localized E-PDCCHcandiale set are 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-PDCCHcandate set of the terminal under an aggregation level L according to the time-frequency resources occupied by the corresponding distributed E-PDCCHcandate set of the terminal under the aggregation level L, the time-frequency resources occupied by the corresponding distributed E-PDCCHcandate set under the aggregation level L are all or part of the time-frequency resources occupied by the corresponding distributed E-PDCCHcandate set under the aggregation level L, and the time-frequency resources occupied by the corresponding distributed E-PDCCHcandate set under the aggregation level L mean that each E-PDCCHscan set in the distributed E-PDCCHcandate set occupies the time-frequency resources corresponding to the E-CCCCCCCCEs of the distributed E-PDCCHscan sets.

30. The network-side device of claim 29, wherein a time-frequency resource occupied by one distributed E-PDCCHcandidate of a distributed E-PDCCHcandidate set corresponding to an aggregation level L is a combination of partial or all time-frequency resources occupied by each E-PDCCHcandidate in a plurality of E-pdcchcandidates of a localized E-PDCCHcandidate set corresponding to an aggregation level L.

31. A terminal, comprising:

the localized E-PDCCH search space determining module is used for determining that the absolute values of the difference values of the starting E-CCEs of any two adjacent E-PDCCHcadicates in the localized E-PDCCHcadicacid set corresponding to each aggregation level are equal 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-PDCCHcadicacid in the localized E-PDCCHcadicacid set corresponding to each aggregation level and the starting position of the localized E-PDCCHcadicacid set corresponding to each aggregation level;

32. The terminal of claim 31, wherein:

33. The terminal of claim 32, wherein the absolute value of the difference between the numbers of the starting E-CCEs between any two adjacent E-pdcchcandiales in the corresponding localized E-pdcchcandiale set at an aggregation level is equal to:

or,

34. The terminal according to claim 31 or 32, characterized in that the terminal further comprises:

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

or,

and a second E-PDCCHcandidate number configuration module, configured to receive the E-PDCCHcandidate numbers in the corresponding localized E-PDCCHcandidate set for each aggregation level sent by the network side device.

35. The terminal of claim 31, wherein the terminal further comprises:

a starting position configuration module of the first localized e-PDCCHcandidate set, configured to determine, according to an RNTI of the terminal, an offset parameter of a starting position of the localized e-PDCCHcandidate 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.

36. The terminal of claim 31, wherein the terminal further comprises:

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

or,

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

37. The terminal of claim 33, wherein if a difference in the starting E-CCE number between any two adjacent E-pdcchcandials in the corresponding localized E-pdcchcandiale set at aggregation level L is an integer multiple of the aggregation level to which the localized E-pdcchcandiale set corresponds, the E-CCE number of the localized E-PDCCH occupied by each E-pdcchcandiale in the corresponding localized E-pdcchcandiale set at aggregation level L is:

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

38. The terminal of claim 33, wherein if a difference between the starting E-CCEs of any two adjacent E-pdcchcandials in the corresponding localized E-pdcchcandialate 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 PRBpair, then the E-CCEs of localized E-pdcchcandialates occupied by each E-pdcchcandialate in the corresponding localized E-pdcchcandialate set at aggregation level L have the following numbers:

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

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

q represents the least common multiple of L and K.

39. A terminal, comprising:

a localized E-PDCCH search space determining module, 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 to transmit the E-PDCCH in a current subframe, the number of E-PDCCHcandials in a localized E-PDCCHcandialate set corresponding to an aggregation level L, and an initial position of a localized E-PDCCHcandialate set corresponding to the aggregation level L, that each E-PDCCHcandiale in the localized E-PDCCHcandialate set corresponding to the aggregation level L occupies the number of the E-CCEs of the localized E-PDCCH, and that absolute values of difference values of the numbers of the initial E-CCEs between any two adjacent E-PDCCHcadiales in the localized E-PDCCHcandialate set are equal;

40. The terminal of claim 39, wherein a distributed E-PDCCHcandidate of a distributed E-PDCCHcandidate set corresponding to an aggregation level occupies a time-frequency resource which is a combination of a part or all of the time-frequency resources occupied by each E-PDCCHcandidate in a plurality of E-PDCCHcandidates of a localized E-PDCCHcandidate set corresponding to an aggregation level L.