WO2013107045A1

WO2013107045A1 - Resource distribution method, and searching method and device therefor

Info

Publication number: WO2013107045A1
Application number: PCT/CN2012/070671
Authority: WO
Inventors: 张元涛; 王轶; 周华
Original assignee: 富士通株式会社
Priority date: 2012-01-20
Filing date: 2012-01-20
Publication date: 2013-07-25

Abstract

A resource distribution method for a search space, and a searching method and a device therefor. The resource distribution method comprises: when the manner of sending an enhanced control signalling is an open loop-based transmit diversity sending manner, in accordance with each subframe, dynamically distributing resources in a search space, which corresponds to the sending manner. Through the method, the resources can be fully used, thereby avoiding wasting the resources.

Description

Resource allocation method, search method and device thereof

The present invention relates to the field of communications, and in particular, to a resource allocation method, a search method, and an apparatus therefor.

Background technique

In the Long Term Evolution (LTE) system, a physical downlink control channel (PDCCH) is used to transmit control information, where the control information includes downlink scheduling information (DL-Grant) and uplink scheduling information (UL-Grant). ) and power control information. The downlink control signaling (PDCCH) of all mobile stations in the cell is multiplexed in the first several Orthogonal Frequency Division Multiplexing (OFDM) symbols of one subframe. At present, there may be up to 3 OFDM symbols for transmitting downlink control signaling (PDCCH), and the following OFDM symbols are used by the base station to transmit information transmitted by the mobile station in a Physical Downlink Shared Channel (PDSCH). .

FIG. 1 shows a schematic diagram of a typical subframe structure in the prior art. As shown in FIG. 1, in each subframe, control signaling (PDCCH) multiplexed for the mobile station is transmitted in the first 1, 2 or 3 OFDM symbols of the subframe.

Each PDCCH may contain 1, 2, 4 or 8 Control Channel Elements (CCEs), each CCE contains 9 Resource Element Groups (REGs), and each REG contains 4 resource particles ( RE, Resource Element), 36 resource particle REs per CCE.

The resource included in the OFDM symbol of the Transmission Control Signaling (PDCCH) is referred to as a control signaling space. The mobile station obtains control signaling related to itself in the control signaling space by blind detection. The control signaling space includes a Common Search Space and a UE_specific Search Space. The public search space sends public signaling such as system information, and occupies the first 16 CCEs. The mobile station-specific search space can overlap with the public search space.

Table 1 shows the information corresponding to different search spaces. For example, the common search space size is 16 CCEs, and two aggregation levels 4 and 8 are divided. When the mobile station searches for the common search space, it searches separately according to aggregation levels 4 and 8, respectively, and the number of search candidates included is 4 and 2, respectively. Each search candidate includes two detections, that is, in the public search space, the mobile station performs a total of (4+2 ) x2 = 12 searches. The mobile station-specific search space may have aggregation levels of 1, 2, 4, and 8, and the number of candidates for each aggregation level of PDCCH is 6, 6, 2, 2, and each candidate contains two searches, that is, a dedicated search in the mobile station. Space, mobile station (6+6+2+2) x2 32 searches. So the total number of searches performed by the mobile station is 12+32.

Table 1

Figure 2 shows a schematic diagram of a common search space and a mobile station specific search space.

As shown in Figure 2, the two aggregation levels of the common search space are fixed from the first CCE (CCE0 in the figure) and contain 16 CCEs (CCE0~CCE15).

The mobile station-specific search space corresponds to different search areas according to different aggregation levels. As shown in FIG. 2, when the aggregation level is L=l, the search area is from CCE17~CCE22; when the aggregation level is L=2, the search is performed. The area is from CCE2CTCCE31; when the aggregation level is L=4, the search area is from CCE12~CCE19; when the aggregation level is L=8, the search area is from CCE16~CCE31; and the search area can overlap with the common search space (as shown in Figure 2). The mobile station-specific search space with the aggregation level of 4 indicated by the dotted line overlaps with the common search space, and the mobile station-specific search space overlaps between different sets of aggregation levels as shown by the dotted line on the right side in FIG. 2) The number of CCEs included in the subframe shown in FIG. 2 is 33, and the numbers 0 to 32 of the CCE are logical numbers.

For an aggregation level, the corresponding search space is defined by the following formula (harshing function), which is expressed as:

S[ ^L) = L{(Y _k + m) modLN _CCi ( 1 ) where N _{ee £ ii} is the number of CCEs included in the subframe, and this parameter mainly depends on the OFDM symbol included in the current subframe control signaling. number;

{1, 2, 4, 8} is the aggregation level;

i = 0,---,Ll; m = 0,--,M ^(L) -1.

M is the number of candidates for the PDCCH for each aggregation level; For the common search space, ^{= U} ; for the mobile-specific search space, ⁼ ( ^A ' ^-i ) ^{m( d Z)} _; ( 2 ) where ₁ = " _RNTI ≠0, A = 39827, Z) = 65537 _An d is the system subframe number, where ^ is the calculated initial value, which is the parameter that determines the starting position of the search space; ^3⁄4NTI is the flag (ID) assigned by the base station to the mobile station.

In the process of implementing the present invention, the inventors have found that the defects of the prior art are:

In an LTE-Advanced system, the number of users of the service is greatly improved. Correspondingly, the capacity of the PDCCH for user scheduling may be limited. Therefore, it has been decided to introduce enhanced control signaling (ePDCCH). Enhanced PDCCH), but for the introduced enhanced control signaling, there is no effective way to allocate the location of the resource where the mobile station search space is located, and how to map the logical search location to the actual physical resource, and how to search. .

Summary of the invention

An object of the embodiments of the present invention is to provide a resource allocation method, a search method, and a device for a search space, and dynamically allocate resources of a search space according to each subframe to avoid resource waste.

According to an aspect of the embodiments of the present invention, a resource allocation method for a search space is provided for an enhanced control signaling space, where the method includes: transmitting an enhanced control signaling in an open loop-based transmit diversity manner In the mode, the resource in which the search space corresponding to the transmission mode is located is dynamically allocated for each subframe.

According to another aspect of the present invention, a resource allocation apparatus for a search space is provided for enhanced control signaling space, and the apparatus includes:

And a resource allocation unit configured to dynamically allocate, according to the transmission mode of the open loop-based transmit diversity, the resource in which the search space corresponding to the transmission mode is located is dynamically allocated for each subframe.

According to another aspect of an embodiment of the present invention, a search method is provided for enhanced control signaling space, the method comprising:

Receiving, by the base station, the location of the resource in the search space corresponding to the sending mode; wherein, when the manner of transmitting the enhanced control signaling is the sending mode of the open loop based transmit diversity, the resource in the search space is the base station according to each sub Frames are dynamically allocated; Determining, according to the location of the resource in which the search space is obtained, the number of enhanced control channel particles included in the resource where the search space is located;

Obtaining a search space for each aggregation level according to the number of the enhanced control channel particles and the parameter determining the starting position of the search space;

For each candidate location of each aggregation level, determining, according to an interleaving algorithm, a location of the enhanced control channel particle corresponding to the physical resource included in the candidate location;

The data is acquired at the obtained location of the physical resource, and the enhanced control signaling is obtained after decoding. According to another aspect of the present invention, there is provided a search apparatus for an enhanced control signaling area, the apparatus comprising:

a receiving unit, configured to receive a location of a resource in a search space corresponding to a sending mode notified by the base station, where the search space is located when the manner of transmitting the enhanced control signaling is a sending mode based on open loop sending diversity The resource is that the base station dynamically allocates and notifies according to each subframe;

a first processing unit, configured to determine, according to the obtained location of the resource where the search space is located, the number of enhanced control channel particles included in the resource where the search space is located;

a second processing unit, configured to obtain a search space of each aggregation level according to the number of the enhanced control channel particles and a parameter determining a starting position of the search space;

a third processing unit, configured to determine, according to the interleaving algorithm, a location of the corresponding physical resource corresponding to the enhanced control channel particle included in each candidate location of each aggregation level;

And a search unit, configured to acquire data at the obtained location of the physical resource, and obtain the enhanced control signaling after decoding.

Another aspect according to an embodiment of the present invention provides a computer readable program, wherein when the program is executed in a resource allocating device, the program causes a computer to execute the resource allocation method as described above in the resource allocating device.

According to another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a resource allocation method as described above in the resource allocation device.

Another aspect according to an embodiment of the present invention provides a computer readable program, wherein when the program is executed in a search device, the program causes a computer to execute the above search method in the search device.

Another aspect according to an embodiment of the present invention provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the above search method in a search device. The beneficial effects of the embodiments of the present invention are as follows: According to the search space corresponding to the transmit diversity TxD transmission mode, the resources of the search space can be dynamically allocated according to each subframe, and the space resources can be fully utilized to avoid resource waste.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which illustrate the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprising", when used herein, refers to the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components.

DRAWINGS

The above and other objects, features and advantages of the embodiments of the present invention will become more <RTIgt;

1 is a typical subframe structure of FIG. 1 of the present invention;

Figure 2 shows a schematic diagram of a common search space and a mobile-specific search space;

3 is a schematic diagram of an ePDCCH region;

4 is a flowchart of a resource allocation method according to Embodiment 1 of the present invention;

FIG. 5A is a schematic diagram of resource configuration when a minimum allocation unit is a CCE;

FIG. 5B is a schematic diagram of resource configuration when a minimum allocation unit is an eCCE;

6 is a flow chart of an interleaving process when the minimum allocation unit is eCCE;

7 is a schematic diagram of a mapping relationship between logical resources and physical resources;

8 is a schematic diagram of the correspondence between physical resources and logical subbands;

FIG. 9 is a second schematic diagram of a mapping relationship between logical resources and physical resources;

FIG. 10 is a third schematic diagram of a mapping relationship between logical resources and physical resources;

11 is a flowchart of a search method according to Embodiment 2 of the present invention;

FIG. 12 is a schematic structural diagram of a resource allocation apparatus of a search space according to Embodiment 3 of the present invention; FIG.

13 is a schematic structural diagram of a resource allocation apparatus of a search space according to Embodiment 4 of the present invention; Figure 14 is a block diagram showing the structure of a search device according to a fifth embodiment of the present invention.

detailed description

Various embodiments of the present invention will be described below with reference to the accompanying drawings. These embodiments are merely exemplary and are not limiting of the invention. The embodiments of the present invention are described by using the LTE-A system and the resource allocation manner of the search space when the ePDCCH is introduced as an example, but it can be understood that the present invention is applicable to the present invention. It is not limited to the above system and is applicable to other systems involving resource allocation.

FIG. 3 is a schematic diagram of an ePDCCH region. As shown in FIG. 3, in the case of introducing enhanced control signaling (ePDCCH), the enhanced control signaling (ePDCCH) of the mobile station is transmitted in the data region (ie, the PDSCH region), and the frequency division multiplexing manner is adopted with the PDSCH. . The ePDCCH refers to control signaling sent in the data area, and the PDCCH refers to control signaling sent in the traditional area (ie, the first 3 OFDM symbols).

For ePDCCH, there are two perspectives:

1. The ePDCCH area only includes a mobile station-specific search space;

In this case, the mobile station only needs to perform the search of the mobile station-specific search space in the ePDDCH area, and does not need to perform the search of the common search space, thereby reducing the number of searches.

2. The ePDCCH area includes both a common search space and a mobile station-specific search space.

The ePDCCH transmitted in the mobile station-specific search space has two transmission modes, namely, a closed-loop MIM0-based transmission mode and an open-loop transmission diversity TxD-based transmission mode; and the common search space ePDCCH can only be based on open-loop transmission diversity transmission. the way.

According to the above point of view, the embodiment of the present invention proposes a resource allocation method, a search method and a device thereof for a search space based on the following two points.

First point: In the current standard, the common search space and the mobile-specific search space are all based on the mode of transmit diversity, and the two spaces are interleaved according to REG.

Second point: The ePDCCH area may contain three logical areas, which are a common search space based on open-loop transmit diversity TxD, a mobile-specific search space based on open-loop transmit diversity TxD, and a mobile-specific search space based on closed-loop MIM0.

In order to reduce the impact on the standardization, in the embodiment of the present invention, the search space of the ePDCCH transmitted in the subframe is divided into two categories. Wherein, according to the manner in which the ePDCCH is transmitted: The first category: TxD-based search space, this space contains two situations:

In the first case, only the UE-specific search space based on the transmit diversity TxD is included.

In the second case, including the common search space and the UE-specific search space based on the transmit diversity TxD, the two spaces are jointly interleaved according to the constituent units of the smallest allocation unit.

The second category: Based on the closed-loop MIM0 mode search space, this space only includes the UE-specific search space based on the closed-loop MIM0 transmission mode;

In this case, the mobile station based on the closed-loop MIM0 scheme does not detect the common search space in the ePDCCH region, and only detects the common search space in the legacy region.

Since the base station performs independent scheduling in each subframe, the number of users and scheduling information scheduled in each subframe may be different. If the search space is semi-statically allocated, if the current subframe does not completely occupy the entire search space, it will bring Waste of resources.

Therefore, in the embodiment of the present invention, for the TxD-based search space, the base station allocates resources for the search space by using a dynamic allocation manner, that is, dynamically allocates resources of the search space according to each subframe, and places the search space. The location of the resource is dynamically notified to the mobile station in each subframe. In this way, the mobile station can calculate the number of CCEs (eCCEs) included in the configured resources according to the resources included in the search space, and obtain a search space for each aggregation level.

The resource allocation method, the search method and the device of the search space according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments of the present invention are mainly described for ePDDCH.

4 is a flow chart of a resource allocation method according to Embodiment 1 of the present invention. As shown in FIG. 4, the method includes: Step 401: When the manner of transmitting the enhanced control signaling is the transmission mode of the open loop-based transmit diversity TxD, dynamically allocate the search space corresponding to the sending mode according to each subframe. resource of;

In this embodiment, the dynamic allocation mode is used to allocate resources in the search space; wherein, the dynamic allocation mode means that the resources in the search space are dynamically changed according to each subframe;

Since the base station performs independent scheduling in each subframe, the number of users and scheduling information scheduled in each subframe may be different. If the semi-static allocation mode is used to allocate the search space, if the current subframe does not completely occupy the entire search space, It will bring waste of resources. Therefore, in an embodiment, a dynamic allocation method is used to allocate the The resource where the search space is located;

In this embodiment, in each subframe, the specific resource allocation may adopt the resource allocation mode 0, 1, 2 in the existing standard, as described in the standard, and details are not described herein again.

Step 402: Notify the mobile station of the location of the allocated resource of the search space;

In this embodiment, the specific location of the resource included in the TxD-based search space dynamically informs the mobile station in each subframe;

In this embodiment, the location of the resource of the mobile station is notified by high layer signaling or a message;

A new downlink control information (DCI, Downl ink Control Information) may be set for the dynamic notification mode, and a fixed resource is allocated in the data region (PDSCH region) for transmitting the DCI.

In the present embodiment, in order to reduce the influence on standardization, the search space is classified according to the transmission method before the resources are allocated. In this way, the method may further include: configuring a search space according to the sending manner; wherein, the search space based on the sending manner of the sending diversity:

1) Contains a UE-specific search space;

In this case, the mobile station searches for a mobile station-specific search space transmitted in the ePDCCH region.

2) Includes both common search space and mobile-specific search space

(UE-specific search space), the common search space and the mobile-specific search space are interleaved according to the constituent units of the smallest allocation unit;

In this case, the mobile station searches for the mobile station-specific search space and the common search space transmitted in the ePDCCH region.

In this embodiment, the search space based on the closed MIM0 mode: includes a UE-specific search space based on the closed MIM0 transmission mode;

In this case, the mobile station does not search for the common search space transmitted in the ePDCCH.

In this embodiment, after the search space corresponding to the foregoing transmission mode is configured, the mobile station may be notified of the search space corresponding to the configured transmission mode, so that the mobile station performs a corresponding search in the ePDCCH region.

In the present embodiment, for the search space based on the transmission mode of the transmission diversity, the common search space and the UE-specific search space are simultaneously included, the common search space and the mobile The dedicated search space of the station is jointly interleaved according to the constituent units of the smallest allocation unit.

Wherein the smallest allocation unit is a control channel particle (CCE) or an enhanced control channel particle (eCCE:).

1) The smallest allocation unit is CCE

In the allocated search space, according to the current standard, with CCE as the smallest allocation unit, each CCE contains 9 REGs, each 1^6 4 1^. REG is the constituent unit when the minimum allocation unit is CCE. FIG. 5A is a schematic diagram of resource configuration when the smallest allocation unit is a CCE.

2) The smallest allocation unit is eCCE

An enhanced CCE (eCCE, enhanced CCE) is used as the smallest allocation unit in the allocated search space, and each eCCE includes k sub-bands, which can be allocated in different physical resource block pairs (PRB). Pair) or the same physical resource block pair (PRB pair). The subband is the constituent unit when the minimum allocation unit is eCCE. FIG. 5B is a schematic diagram of resource configuration when the smallest allocation unit is an eCCE.

As can be seen from the above, when the enhanced control signaling ePDCCH is transmitted, the interleaving can be performed in the above two manners. The interleaving method will be described below with reference to the accompanying drawings, in which the minimum allocation unit is an eCCE.

Wherein, when the minimum allocation unit is an enhanced control channel particle, the enhanced control signaling space includes “PRB pair”, and each resource block pair includes a sub-band (mini-band), The number of subbands is "x fc _; each enhanced control channel particle (eCCE) contains subbands; when interleaving according to the smallest unit of allocation unit, the number of columns is _ and the number of rows is ^, according to

The J sequence writes the number of the logical subbands into the matrix of ^ _x in rows, and then reads the logical number in the order of the columns, where /' is a positive integer.

The current ePDCCH search space includes "=4 PRB pairs as an example. Each PRB pair contains t = 4 mini-bands, as shown in FIG. 5B. Each eCCE includes = 2 sub-bands (mini-band). ), the search space contains = " x A: = 16 mini-bands, and the number of the mini-band is {0,1,2,. · ., 15}.

Figure 6 is a flow chart of the interleaving process when the minimum allocation unit is eCCE. As shown in FIG. 6, the method includes:

Step 601, setting the number of columns C, in order to divide the =2 mini-bands included in one eCCE as far as possible in the frequency domain to obtain better frequency domain diversity effect, C ==2 is proposed here;

Step 602, determining the row according to the number of columns C = _ and the total number of mini-bands = " x A: = 16,

Replace (Article 26) Number R, D≤RxC;

Where, as in the above example, C = j = 2', the total number of subbands is D = «xA: = 16, then the number of rows ? = 8.

Step 603, sequentially writing the number of the logical sub-band (mini-band) into the matrix according to the principle of writing the line.

(ΛχΟ matrix;

Wherein, the matrix is as follows -

Step 604, reading the number by column;

Thus, the number of logical sub-bands corresponding to each PRB is shown in Figure 7 and Figure 8; for PRB pair 1, the logical sub-bands of the PRB pair 1 are numbered 0, 2, 4, 6, and other PRB pairs. In turn, as shown in Figure 7.

In the process of implementing the present invention, the inventors have carefully observed and found that:

As shown in FIG. 5B, the number of available REs included in each mini-band is different. If the above interleaving is performed according to =__, the eCCEO fix includes the 0th subband of the PRB pair1 and the PRB pair3 (mini- Band 0), eCCEl fixed PRB pair1 and the first sub-band of PRB pair3 (mini-band 1). The two eCCEs contain different numbers of available REs, so if eCCEO and eCCEl are respectively assigned to two different UEs, There is a difference between the performance of this UE, which is not fair to the eCCEO UE. Based on this observation, two enhancement schemes are proposed below.

In the first embodiment, when the smallest allocation unit is an enhanced control channel particle, the enhanced control signaling space includes “a resource block pair, and each resource block pair includes A sub-bands, and the total number of sub-bands is “> Each enhanced control channel particle includes a sub-band; when interleaving according to the smallest constituent unit of the allocation unit, the number of columns is ' ⁺ , ^Z is preferably 1, but is not limited to 1. The number of logical subbands is written into the matrix in rows, and then the number is read in the order of the columns; in this case, the number of columns of the matrix is +/, and the number of rows R should be ^ The value obtained after rounding up constitutes the ?xC matrix, and inserts the mark 1^ by the line at the front = (/^()-(">^) position.

Replace (Article 26) When the number is read by column, the NULL is ignored; where Z is a positive integer.

The following is explained by way of example: based on the embodiment shown in Fig. 6, the difference from the embodiment shown in Fig. 6 is as follows:

Set the matrix, the number of columns to C = + / = 3, Z to 1, and the number of rows? = 6 because ?xC = 18>16, for the construction matrix, in this embodiment, in front of the first row of the matrix 2 The position insertion marker N=NULL, the constructed matrix is as follows:

If Null is omitted and read out by column, the number of the logical Mini-band corresponding to each PRB is as shown in Figure 9.

In the scheme 2, when the smallest allocation unit is an enhanced control channel particle, the enhanced control signaling space includes “resource block pairs (PRBpair), each resource block pair includes t sub-bands, and the total number of sub-bands For "χ; each enhanced control channel particle contains a subband;

Prior to interleaving, the logical subbands are divided into M groups, each group containing A subbands, and then shifted by group pairs: subbands. For example, the logical subbands contained in a group are { , A, ... > Ρ ^} ' The shifting of subbands by group means that the position of at least one subband is arbitrarily transformed as in the case; ^ _, the sub-band is shifted to the first position, that is, {p _k - , p ₀ , _Pl , ..., p _k - ₂ }> but is not limited to this shift mode, and can be moved to any position , but each group is shifted in the same way.

It is assumed that the divided ePDCCH space contains a total of "PRB pairs, and each PRB pair contains t = 4 mini-bands. If mod2 = 0, it needs to be shifted, otherwise it is not needed, and mod is the remainder operation.

For example, based on the embodiment shown in FIG. 6, the difference from the embodiment shown in FIG. 6 is that: Before the interleaving, the logical sub-band is divided into "=4 groups, and each group contains ^= 4 sub-bands, then shifting t = 4 sub-bands by group, where

The four subbands are: group l{k0, kl, k2, k3}, group 2{k4, k5, k6, k7}, group 3{k8, k9, klO, kll}, group 4{kl2, kl3, Kl4, kl5}; For each group of subbands, when shifting the subbands by group, first shift the group 1 logical subband {{k0, kl, k2, k3}, for example, the k3th subband Move to the first position and get {k3, k0, kl, k2}. For the other three groups, the shift mode is the same as the group 1, that is, after shifting.

26 The subbands of each group are expressed as: group 2 { k7, k4, k5, k6 }, group 3 { kll, k8, k9, klO }, group 4 { kl5, kl2, kl3, kl4}. Thus, in the above example, 16 sub-bands are shifted by group.

For example, before shifting, the logical number of the subband is: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15. The four logical subbands are: group 1 {0, 1, 2, 3}, group 2 {4, 5, 6, 7}, group 3 {8, 9, 10, 11}, group 4 {12, 13 , 14, 15}.

After shifting, the four logical subbands are: {3, 0, 1, 2}, group 2 { 7, 4, 5, 6 }, group 3 {11, 8, 9, 10 }, group 4 { 15 , 12, 13, 14}. The logical number of the subband after shifting is: 3, 0, 1, 2, 7, 4, 5, 6, 11, 8, 9, 10, 15, 12, 13, 14.

Then interleaving, that is, column = 3, row = 8, the subband number after the shift is written in rows, then the corresponding matrix is:

The label is read out in columns, and the number of the logical Mini-band corresponding to each PRB is as shown in FIG. As can be seen from the above embodiments, the number of resources allocated to different mobile stations tends to be equal by the above two enhanced schemes.

In the above, the case where the minimum allocation unit is the eCCE is described. For the case where the minimum allocation unit is the CCE, the interleaving manner is the same as the interleaving manner of the PDCCH in the existing standard, and details are not described herein again.

In this embodiment, the method further includes: configuring a parameter ί for calculating a starting position of the search space, where the parameters are the same for each aggregation level; or configuring one for each aggregation level allocation The parameters are; the mobile station is notified of the configured parameters. In this way, when the mobile station obtains the parameter, the search space of each aggregation level is obtained by using the parameter, and resource waste can be avoided.

It can be seen from the foregoing embodiment that since the base station performs independent scheduling in each subframe, the number of users scheduled in each subframe and the scheduling information may be different. If the semi-static allocation mode is used to allocate the search space, resource waste is incurred. Therefore, the embodiment of the present invention uses a dynamic allocation manner to allocate resources of the search space, thereby avoiding waste of resources. In addition, in this embodiment, the search space is configured according to the sending manner; the mobile station can be notified of the search space by using a new DCI. Where the resource is located; and when the ePDCCH is transmitted, in order to make the number of REs included in each eCCE as equal as possible, a corresponding solution to solve the problem is also proposed.

Replace (Article 26) Figure 11 is a flow chart showing a search method according to a second embodiment of the present invention. As shown in FIG. 11 , the method includes: Step 1101: Receive a location of a resource where a search space corresponding to a sending mode notified by the base station is located. In this embodiment, the method for transmitting enhanced control signaling is an open loop-based sending. When the diversity transmission mode is used, the resource in which the search space is located is dynamically allocated by the base station according to each subframe, and the base station dynamically notifies the location of the resource where the search space is located according to each subframe;

As described in Embodiment 1, the manner of the notification may be any one of the existing methods. In addition, a new DCI may be set to notify, and details are not described herein again.

Step 1102: Determine, according to the obtained location of the resource where the search space is located, the number of enhanced control channel particles included in the resource where the search space is located;

In this embodiment, for example, the number of eCCEs may be determined according to the number of subbands included in each predetermined PRB pair, which is similar to the prior art, and details are not described herein again. Step 1103: Obtain a search space of each aggregation level according to the number of the enhanced control channel particles and a parameter that determines a starting position of the search space.

In this embodiment, the following formula (3) can be used to calculate the search space of each aggregation level;

Sf ) = L{(Y _k + m) mod[N _eCCE , ( 3 )

Where is the number of eCCEs contained in the space; the meanings of other physical quantities are the same as the formula (1), and will not be described here.

In the formula (3), the determination can be made as described in the background art. In this case, the inventors found that if calculated according to the background art part, since the PDCCH space must contain a common search space, where for the common search space, = 0, that is, always CCE inde _X =0 starts the search; For the mobile station-specific search space, there is a great possibility that the starting point of the search space corresponding to each aggregation level of all mobile stations does not start from 0. However, for the enhanced PDCCH search space, whether there is a common search space is configurable, if there is no such space (based on the first configuration of the TxD transmission mode, only the mobile station-specific search space is included), according to the background art If the mobile station-specific search space calculated in the manner described does not include several eCCEs starting from 0, it will bring waste of resources. Therefore, for a certain aggregation level of the enhanced PDCCH, in order to avoid waste of resources, the parameter may be configured by the base station, and then notified to the mobile station, the parameter is a parameter configured by the base station to the mobile station to determine a starting position of the search space, The parameter may be a value that is the same for all the agreement levels, or a value may be separately prepared for each agreement level. In this embodiment, the parameter is configurable. Is 0 or any positive integer.

Step 1104: Determine, for each candidate location of each aggregation level, a location of the physical resource corresponding to the eCCE included in the candidate location according to an algorithm of interleaving;

In this embodiment, determining the location of the physical resource according to the interleaving algorithm may be any one of the existing methods, and details are not described herein again.

Step 1105: Read data at the obtained location of the physical resource, and decode the data to obtain the enhanced control signaling.

The process is similar to the prior art and will not be described here.

In this embodiment, the method further includes: acquiring a search space corresponding to the sending manner configured by the base station; where, a search space based on a sending manner of the sending diversity:

Contains a mobile-specific search space; or,

At the same time, a common search space and a mobile-specific search space are included, and the common search space and the mobile-specific search space are interleaved according to the constituent units of the smallest allocation unit.

In addition, the search space based on the closed MIM0 mode: includes a UE-specif ic search space based on the closed MIM0 transmission mode;

In addition, the method may further include: receiving, by the mobile station, a parameter configured to calculate a starting position of the search space, the parameter may be stored and used when the mobile station performs a search space.

According to the foregoing embodiment, the base station uses a dynamic allocation manner to allocate resources of the search space and dynamically notify the resource location, thereby avoiding waste of resources. In addition, the search space is configured according to the sending manner, so that the mobile station can dynamically The location of the resource to be notified to determine the search space corresponding to each aggregation level, thereby performing a search.

A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. The method may include all or part of the steps in the foregoing embodiment, and the storage medium may include: ROM, RAM, magnetic disk, optical disk, and the like.

The embodiment of the invention further provides a resource allocation device and a search device for a search space, as described in the following embodiments. Since the resource allocation device and the search device of the search space solve the problem similarly to the resource allocation method and the search method of the device, the resource allocation device and the search device of the search space may be implemented. To refer to the implementation of the method, the repetition will not be repeated.

Figure 12 is a diagram showing a resource allocation device for a search space according to a third embodiment of the present invention. The apparatus is for an enhanced control signaling area, which may be a network side entity, such as a base station.

As shown in FIG. 12, the device includes a resource allocation unit 1201;

The resource allocation unit 1201 is configured to dynamically allocate resources of the search space corresponding to the transmission mode for each subframe when the manner of transmitting the enhanced control signaling is the transmission mode of the open loop-based transmission diversity.

In this embodiment, the specific manner of allocating resources by the resource allocating unit 1201 is as described in step 401 of Embodiment 1, and details are not described herein again. It can be allocated according to the constituent units of the smallest allocation unit, such as REG or sub-band.

As shown in FIG. 12, the apparatus further includes a first notification unit 1202, and the first notification unit 120 is configured to notify the mobile station of the location of the allocated resource of the search space.

In this embodiment, the notification is dynamically performed in accordance with each subframe. As described in step 402 of Embodiment 1, the notification unit 1202 may also set a new DCI, and notify the mobile station of the location of the resource through the DCI.

It can be seen from the foregoing embodiment that since the base station performs independent scheduling in each subframe, the number of users scheduled in each subframe and the scheduling information may be different. If the semi-static allocation mode is used to allocate the search space, resource waste is incurred. Therefore, the embodiment of the present invention uses a dynamic allocation manner to allocate resources of the search space, thereby avoiding waste of resources; in addition, the location of the resource where the search space is located by the mobile station can be notified by the new DCI.

Figure 13 is a block diagram showing the structure of a resource allocation apparatus according to a fourth embodiment of the present invention. As shown in FIG. 13, the apparatus includes a resource allocation unit 1301 and a first notification unit 1201; further, the apparatus further includes a space configuration unit 1303, and the space configuration unit 1303 is configured to configure a search space according to a transmission manner;

In the case of the device, the device may further include a notification unit 1304 and a first storage unit 1305; wherein the notification unit 1304 is configured to notify the mobile station of the search space corresponding to the configured transmission mode; the first storage unit 1305 is configured to be configured The search space corresponding to the sending method is stored. In this way, when the resource allocation unit 1301 performs resource allocation, the search space corresponding to the transmission mode can be obtained from the space configuration unit 1303 or the first storage unit 1305.

The configured search space based on the sending manner is as described in Embodiment 1 and Embodiment 2, and details are not described herein.

Furthermore, the apparatus may further include: a parameter configuration unit and a second notification unit (not shown); wherein the parameter configuration unit is configured to configure a parameter for calculating a starting position of the search space, wherein, for each aggregation The parameters described in the level are the same; or one parameter is configured for each aggregation level allocation; the second notice The element is used to notify the mobile station of the configured parameters.

In this embodiment, when the TxD-based transmission mode is used, in the ePDCCH region, when the search space includes both the common search space and the mobile station-specific search space, when transmitting enhanced control signaling (ePDCCH), according to the smallest allocation unit The constituent units are interleaved; wherein the smallest allocation unit is a control channel particle or an enhanced control channel particle, as shown in Embodiment 1, FIG. 5A and FIG. 5B, and details are not described herein again.

Therefore, in the above case, the apparatus further includes an interleaving unit (not shown) for interleaving in accordance with the constituent unit of the smallest allocation unit. The minimum allocation unit is a control channel particle (CCE) or an enhanced control channel particle (eCCE), and the specific content is shown in Embodiment 1, and details are not described herein again.

When the smallest allocation unit is eCCE, when the search space includes both the common search space and the mobile station dedicated search space, the interleaving unit may perform interleaving in the manner described in Embodiment 1. When the smallest allocation unit is CCE, the interleaving is similar. The following takes the smallest allocation unit as an example of eCCE.

1. When the smallest allocation unit is an enhanced control channel particle, the enhanced control signaling space includes M resource block pairs (PRB pairs), and each resource block pair includes a sub-band (mini-band). The number of subbands is wx fc ; each enhanced control channel particle (eCCE) contains subbands;

When the interleaving unit performs interleaving according to the constituent unit of the smallest allocation unit, the number of columns is the number of rows.

^, according to the number of logical sub-bands written in rows, and then read in the order of the columns, where n, k, j j

Both are positive integers.

In this embodiment, in order to make the number of REs included in each eCCE as equal as possible, the following two methods can be used to solve the problem. For specific examples, see Embodiment 1, and details are not described herein again.

2. When the smallest allocation unit is an enhanced control channel particle, the enhanced control signaling space includes M resource block pairs, each resource block pair includes sub-bands, and the total number of sub-bands is M x fc ; Each enhanced control channel particle contains 'subbands'; when the interleaving unit interleaves according to the smallest unit of allocation unit, the number of columns is ^+Z , and ^Z is preferably 1. The number of logical subbands is written into the matrix in rows, and then the number is read in the order of the columns; in this case, the number of columns of the matrix is + /, and the number of rows R should be ^ After rounding up, get j + l

The obtained value constitutes the wx c matrix, and the mark is inserted in the front (:= ^ 0 - ^ ^:) positions by the row and 1^, and when the number is read by the column, the LL is ignored. For specific examples, see Embodiment 1, and details are not described herein again. 3. For this scheme, the resource allocation apparatus further includes a processing unit (not shown), wherein the enhanced control signaling space includes M when the minimum allocation unit is an enhanced control channel particle A pair of resource blocks, each of which has a sub-band, the total number of sub-bands is M x fc ; when each enhanced control channel particle contains 'sub-bands, the logical sub-band is divided into w groups before interleaving, Each group contains sub-bands, and then the sub-bands are shifted by group. For example, suppose a group contains subbands. ..., _Pk _ _x ), the shifting of the sub-bands by group means arbitrarily transforming the position of at least one sub-band. If the ^^ sub-bands are shifted to the first position, ie /A, ..., p _k but not limited to this shifting mode, they can be moved to any position, but each group must be guaranteed The subbands are shifted in the same way.

Thus, the interleaving unit performs interleaving in a row read manner in accordance with row writing. For specific examples, see Embodiment 1, and details are not described herein again.

In this embodiment, the resource allocation device may be a network side functional entity, such as a base station.

It can be seen from the foregoing embodiment that since the base station performs independent scheduling in each subframe, the number of users scheduled in each subframe and the scheduling information may be different. If the semi-static allocation mode is used to allocate the search space, resource waste is incurred. Therefore, the device in the embodiment of the present invention allocates the resource in the search space by using a dynamic allocation manner, and avoids waste of resources. In addition, the embodiment configures the search space according to the sending manner; the mobile station can be notified by the new DCI. The location of the resource where the search space is located; and when the ePDCCH is transmitted, in order to make the number of REs included in each eCCE as equal as possible, a corresponding solution to solve the problem is also proposed.

Figure 14 is a diagram showing the structure of a search device according to a fifth embodiment of the present invention. As shown in FIG. 14, the apparatus includes: a receiving unit 1401, a first processing unit 1402, a second processing unit 1403, a third processing unit 1404, and a search unit 1405;

The receiving unit 1401 is configured to receive a location of a resource where the search space corresponding to the sending mode notified by the base station is located, where the search space is located when the manner of transmitting the enhanced control signaling is the sending mode of the open loop-based sending diversity The resource is that the base station dynamically allocates and notifies according to each subframe;

The first processing unit 1402 is configured to determine, according to the obtained location of the resource where the search space is located, the number of enhanced control channel particles included in the resource where the search space is located;

a second processing unit 1403, configured to obtain a search space of each aggregation level according to the number of the enhanced control channel particles and a parameter that determines a starting position of the search space;

The third processing unit 1404 is configured to determine, according to the interleaving algorithm, a location of the corresponding physical resource corresponding to the enhanced control channel particle included in each candidate location of each aggregation level; The searching unit 1405 is configured to obtain data on the obtained location of the physical resource, and perform decoding to obtain the enhanced control signaling.

The execution methods of the above-mentioned respective units are respectively as described in step 110 of Embodiment 2, and are not described herein again. As shown in FIG. 14, the device further includes an obtaining unit 1406, and the obtaining unit 1406 is configured to obtain a search space corresponding to the sending mode configured by the base station. The specific content is as described in Embodiment 1, and details are not described herein again.

In this embodiment, as shown in FIG. 14, the apparatus may further include a second storage unit 1407, configured to store a location of a resource where the search space received by the receiving unit 1401 is located, and a search for a base station configuration acquired by the obtaining unit 1406. space. Further, the receiving unit 1401 and the obtaining unit 1406 can be implemented by one unit.

In addition, the apparatus may further include a parameter receiving unit 1408, configured to receive a parameter configured by the base station for calculating a starting position of the determining search space, and the second storage unit 1407 may further store the parameter, and perform a search at the mobile station. Use when space is available. This part is an optional part.

According to the foregoing embodiment, the base station uses a dynamic allocation manner to allocate resources of the search space and dynamically notify the resource location, thereby avoiding waste of resources. In addition, the search space is configured according to the sending manner, so that the mobile station can dynamically The resource location of the notification determines the search space corresponding to each aggregation level, thereby performing a search.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a resource allocation device, the program causes a computer to execute the resource allocation method as described in Embodiment 1 in the resource allocation device.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the resource allocation method as described in Embodiment 1 in the resource allocation device.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a search device, the program causes a computer to execute the search method as described in Embodiment 2 in the search device.

The embodiment of the present invention also provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the search method as described in Embodiment 2 in the search device.

The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like. The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are illustrative and not restrictive. A person skilled in the art can make various modifications and changes to the present invention within the scope of the present invention.

Claims

Claim

A resource allocation method for a search space, which is used for an enhanced control signaling space, the method includes: when transmitting an enhanced control signaling manner according to an open loop-based transmission diversity transmission manner, according to each subframe The resource in which the search space corresponding to the sending mode is located is dynamically allocated.

2. The method according to claim 1, wherein the method further comprises: the base station notifying the mobile station of the location of the allocated resource of the search space.

The method according to claim 2, wherein the base station notifies the mobile station of the location of the allocated resource of the search space by using downlink control signaling.

The method according to claim 1, wherein the method further comprises: configuring a search space according to a sending manner; wherein, a search space based on a sending manner of the sending diversity:

Contains a mobile-specific search space; or,

A common search space and a mobile-specific search space are simultaneously included, and the common search space and the mobile-specific search space are interleaved according to the constituent units of the smallest allocation unit.

The method according to claim 4, wherein the minimum allocation unit is a control channel particle or an enhanced control channel particle, and the constituent unit of the control channel particle is a resource particle group, and the enhanced control channel particle The constituent units are sub-bands.

6. The method according to claim 5, wherein, when the minimum allocation unit is an enhanced control channel particle, the enhanced control signaling space includes w resource block pairs, each resource block pair being included The number of subbands, the total number of subbands is M x fc ; each enhanced control channel particle contains subbands; when interleaving according to the smallest unit of allocation unit, the number of columns is, the number of rows is ^, according to i The order of the logical sub-bands is written into the matrix in rows, and then the numbers are read out in the order of the columns; wherein j, n are positive integers.

7. The method according to claim 5, wherein, when the minimum allocation unit is an enhanced control channel particle, the enhanced control signaling space includes w resource block pairs, each resource block pair being included Sub-bands, the total number of sub-bands is M x fc ; each enhanced control channel particle contains sub-bands; when interleaving according to the smallest unit of allocation unit, the number of columns is ^{+ Z} , and the number of rows is ^ j + l The values obtained after the rounding are performed, the numbers of the logical sub-bands are written into the matrix in the order, and then the numbers are read out in the order of the columns;

Where j, n, k, and Z are all positive integers.

8. The method according to claim 5, wherein, when the minimum allocation unit is an enhanced control channel particle, the enhanced control signaling space includes w resource block pairs, each resource block pair being included Sub-bands, the total number of sub-bands is wx fc ; each enhanced control channel particle contains sub-bands;

Before interleaving, the logical subbands are divided into w groups, each group contains subbands, and then the subbands are shifted by group; j, u, are positive integers.

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

Configuring a parameter for calculating a starting position of the search space, wherein the parameters are the same for each aggregation level; or configuring one of the parameters for each aggregation level allocation;

Notifying the mobile station of the configured parameters.

A resource allocation device for a search space, for an enhanced control signaling space, the device comprising: a resource allocation unit, wherein the method for transmitting enhanced control signaling by the resource allocation unit is based on an open loop When the transmission mode of the diversity is transmitted, the resource in which the search space corresponding to the transmission mode is located is dynamically allocated for each subframe.

The device according to claim 10, wherein the device further comprises:

a first notification unit, wherein the first notification unit is configured to notify the mobile station of the location of the allocated resource of the search space.

12. The device according to claim 10, wherein the device further comprises:

a space configuration unit, where the space configuration unit is configured to configure a search space according to a sending manner;

Wherein, the search space based on the transmission mode of the transmission diversity:

Contains a mobile-specific search space; or,

13. The apparatus according to claim 12, wherein the minimum allocation unit is a control channel particle or an enhanced control channel particle; the control channel particle is composed of a resource particle group, and the enhanced control channel particle The constituent units are sub-bands.

14. Apparatus according to claim 13 wherein said minimum allocation unit is enhanced control And the apparatus further includes: an interleaving unit, configured to perform interleaving according to a constituent unit of a minimum allocation unit, where the enhanced control is performed, where the channel is configured to include a common search space and a mobile station-specific search space. The signaling space includes M resource block pairs, each resource block pair includes sub-bands, and the total number of sub-bands is wx fc; each enhanced control channel particle includes sub-bands; and the constituent unit according to the smallest allocation unit When interleaving, the number of columns is the number of rows, and the number of logical subbands is written in rows in order.

The matrix is entered, and then the number is read out in the order of the columns; wherein j, n are positive integers.

The apparatus according to claim 13, wherein, when the minimum allocation unit is an enhanced control channel particle, and includes both a common search space and a mobile station-specific search space, the apparatus further includes: an interleaving unit, The interleaving unit is configured to perform interleaving according to a component unit of a minimum allocation unit, where the enhanced control signaling space includes a resource block pair, where the minimum allocation unit is an enhanced control channel particle, The resource block pair contains sub-bands, the total number of sub-bands is wx fc; each enhanced control channel particle contains sub-bands; when interleaving according to the smallest allocation unit, the number of columns is ^{j + l} , The number of rows is the value obtained by rounding up, and the number of logical subbands is written into the moment j + l in order.

The array is then read out in the order of the columns; wherein j, n, k, / are all positive integers.

The apparatus according to claim 14 or 15, wherein the apparatus further comprises a processing unit, the processing unit is configured to: when the minimum allocation unit is an enhanced control channel particle, the enhanced control signal Let the space contain M resource block pairs, each resource block pair contains sub-bands, the total number of sub-bands is zi x fc; when each enhanced control channel particle contains sub-bands, before the interleaving, the logical sub-band Divided into w groups, each group contains sub-bands, and then the sub-bands are shifted by groups; wherein, j, n, are positive integers.

17. The device according to claim 10, wherein the device further comprises:

a parameter configuration unit, configured to calculate a parameter for calculating a starting position of the search space, wherein the parameters are the same for each aggregation level; or configuring one of the parameters for each aggregation level allocation ;

And a second notification unit, configured to notify the mobile station of the configured parameter.

18. A search method for enhanced control signaling space, the method comprising:

Receiving, by the base station, the location of the resource in the search space corresponding to the sending mode; wherein, when the manner of transmitting the enhanced control signaling is the sending mode of the open loop based transmit diversity, the resource in the search space is The base station dynamically allocates according to each subframe;

Determining, according to the location of the resource in which the search space is obtained, the number of enhanced control channel particles included in the resource where the search space is located;

Obtaining a search space of each aggregation level according to the number of the enhanced control channel particles and a parameter determining a starting position of the search space;

Data is acquired at the location of the obtained physical resource, and the enhanced control signal is obtained after decoding.

19. The method according to claim 18, wherein the search space of each aggregation level is obtained according to the following formula:

Sf ) = L{(Y _k + m) mod[N _eCCE , / ϊ; where ^ is the number of _eCCEs contained in the space; is a _parameter that is configured by the base station to the mobile station to determine the starting position of the search space The parameter is a value that is the same for all aggregation levels, or the parameter is configured with a value for each aggregation level; for the aggregation level; ζ' = ''', ^ _ι,

_{W = 0} , ..., M^ -1 . is the number of candidates for the PDCCH for each aggregation level; M ( ^L ), k, L are positive integers, configured as 0 or positive integers.

The method according to claim 18, wherein the method further comprises: acquiring a search space corresponding to the sending manner configured by the base station; wherein, a search space based on a sending manner of the sending diversity: including a mobile station dedicated Search space; or,

21. A search device for an enhanced control signaling area, the device comprising:

a receiving unit, where the receiving unit is configured to receive a location of a resource in a search space corresponding to a sending mode notified by the base station; where the manner of transmitting the enhanced control signaling is a sending mode based on open loop sending diversity, the searching The resource where the space is located is dynamically allocated and notified by the base station according to each subframe;

a first processing unit, configured to determine, according to the obtained location of the resource where the search space is located, the number of enhanced control channel particles included in the resource where the search space is located; a second processing unit, configured to obtain a search space of each aggregation level according to the number of the enhanced control channel particles and a parameter determining a starting position of the search space;

a third processing unit, configured to determine, according to an interleaving algorithm, a location of the corresponding physical resource corresponding to the enhanced control channel particle included in each candidate location of each aggregation level;

a search unit, configured to acquire data at a location of the obtained physical resource, and perform decoding to obtain the enhanced control signaling.

22. The apparatus according to claim 22, wherein the second processing unit obtains a search space of each aggregation level according to the following formula:

Sf ) = L{(Y _{k +} m)

/ ί;

Where N _{eee £ ii} is the number of eCCEs included in the space; is a parameter that is configured by the base station to the mobile station to determine the starting position of the search space, and the parameter is a value that is the same for all aggregation levels. Or the parameter is configured to respectively configure a value for each aggregation level; L is an aggregation level; ^-1 , _m = 0, -, M ^L) -l. The number of candidates for the PDCCH for each aggregation level; M ( ^L ), k, L are positive integers, configured as 0 or positive integers.

The device according to claim 21, wherein the device further comprises:

An acquiring unit, configured to acquire a search space corresponding to the sending manner configured by the base station; where, a search space based on a sending manner of the sending diversity:

Contains a mobile-specific search space; or,

A computer readable program, wherein when the program is executed in a resource allocation device, the program causes a computer to perform the method according to any one of claims 1 to 9 in the resource allocation device Resource allocation method.

A storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the resource allocation method according to any one of claims 1 to 9 in the resource allocation device.

A computer readable program, wherein when the program is executed in a search device, the program causes a computer to execute the search party according to any one of claims 18 to 20 in the search device Law.

A storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the search method according to any one of claims 18 to 20 in a search device.