CN103582135A - Methods for configuring eCCEs used for ePDCCH - Google Patents

Abstract

The invention discloses methods for configuring eCCEs used for an ePDCCH in a network body of a communication system. According to one method for configuring the eCCEs used for the ePDCCH in the network body of the communication system, the network body can determine the number of the eCCEs and the number of resource elements occupied by each eCCE according to the number of available resource elements in a physical resource block pair. According to another method for configuring the eCCEs used for the ePDCCH in the network body of the communication system, the network body can further determine the number of eREGs occupied by each eCCE and the number of resource elements occupied by each eREG according to the number of the resource elements occupied by the eCCEs. According to the methods for configuring the eCCEs used for the ePDCCH in the network body of the communication system, original configuration of a PDCCH can be compatible, and the standardization progress is accelerated.

Description

A method for configuring eCCE for ePDCCH

technical field

The present invention relates to a communication system, and more particularly, to a method for configuring eCCE for ePDCCH.

Background technique

For the existing physical downlink control channel (PDCCH), each PDCCH uses one or more control channel elements (Control Channel Element, CCE) for information transmission, where each CCE corresponds to 9 groups, and each group contains 4 resources A Resource Element Group (REG) of an element (Resource Element, RE).

Currently, in 3GPP Rel-11, considering enhanced intercell interference coordination (eICIC), coordinated multi-point communication (CoMP), and downlink MIMO, etc., it focuses on the enhanced physical downlink control channel (ePDCCH )the design of. Since ePDCCH is located in the data domain, it is necessary to formulate new rules for ePDCCH different from PDCCH, and the following points need to be considered here: Enhanced Control Channel Element/enhanced Resource Element Group (enhanced ControlChannel Element/enhanced Resource Element Group, eCCE/eREG ), the definition of whether to support interleaving at the eREG level, and the mapping rules of resource elements. Wherein, each ePDCCH is transmitted by using eCCE.

In the RAN1 meeting #69bis, the resource element mapping rules in the case of collision with traditional signals were formulated. For example, both the base station and the user equipment can use chain coding rate-matching (coding chainrate-matching) when one or more of the following four situations occur: 1. Common reference signal (common reference signal, CRS) is set; 2. There are new antenna ports for the new carrier type (New Carrier Type); 3. Various situations of OFDM symbols occupied by the physical downlink control channel (PDCCH) (for example, occupying 1 symbol, 2 symbols, 3 symbols) ; 4. PBCH (Physical Broadcast Channel) and PSS/SSS (Primary Synchronization Signal/Secondary Synchronization Signal) are set. In addition, according to specific situations, a zero-power channel state reference signal (CSI-RS) and a non-zero-power CSI-RS are set for user equipment.

However, so far, the specific design and configuration of eCCEs used for ePDCCH have not been discussed, such as the number of eCCEs in a physical resource block pair, the number of resource elements contained in each eCCE, whether it supports flexibility The number of eCCEs/eREGs, the number of eREGs included in each eCCE, and the number of resource elements occupied by each eREG.

Contents of the invention

It can be seen that according to the background technology, there is currently a lack of research on the specific configuration of the eCCE.

Therefore, in view of the problems existing in the background technology, according to the first aspect of the present invention, a method for configuring eCCE for ePDCCH in a network entity of a communication system is proposed, wherein the method includes the following steps: a. Determine the number of eCCEs in the physical resource block pair and the number of resource elements occupied by each eCCE.

According to a preferred embodiment of the present invention, step a further includes: a11. determining the number of available resource elements in the physical resource block pair; and a12. determining the number of eCCEs in the physical resource block pair as 4, and determine the average number of resource elements occupied by each eCCE based on the determined number of eCCEs in the physical resource block pair; and a13. When the average number of resource elements occupied by each eCCE is an integer, the The average number of resource elements occupied by each eCCE is determined as the number of resource elements occupied by each eCCE, and when the average number of resource elements occupied by each eCCE is a non-integer number, perform step a13-1 or a13-2: a13-1. The network entity includes a base station and a user equipment, and when the base station and the user equipment share a first predetermined rule, the base station and the user equipment are based on the first predetermined rule rule to determine the number of resource elements occupied by each eCCE; a13-2. The network entity includes a base station and user equipment, and when the base station does not share the first predetermined rule with the user equipment, the base station is based on The first predetermined rule determines the number of resource elements occupied by each eCCE, and sends first information to the user equipment, the first information indicates the eCCE occupied by the user equipment and the eCCE occupied by the eCCE The number of resource elements, and the user equipment receives the first information from the base station, and determines the eCCE occupied by it and the number of resource elements occupied by the eCCE based on the first information.

The above embodiments describe a method for fixedly configuring the number of eCCEs in a physical resource block pair, thereby simplifying the implementation process.

According to a preferred embodiment of the present invention, step a further includes a21. determining the number of available resource elements in the physical resource block pair; a22. when the number of available resource elements is higher than or equal to a first threshold , determine a first number of eCCEs, and determine the average number of resource elements occupied by each eCCE based on the first number of eCCEs, and determine when the number of available resource elements is lower than the first threshold A second number of eCCEs, and based on the second number of eCCEs, determine the average number of resource elements occupied by each eCCE; and a23. When the average number of resource elements occupied by each eCCE is an integer, Determining the average number of resource elements occupied by each eCCE as the number of resource elements occupied by each eCCE; when the average number of resource elements occupied by each eCCE is a non-integer number, perform step a23- 1 or a23-2: a23-1. The network entity includes a base station and a user equipment, and when the base station and the user equipment share a second predetermined rule, the base station and the user equipment share a second predetermined rule based on the second A predetermined rule is used to determine the number of resource elements occupied by each eCCE; a23-2. The network entity includes a base station and a user equipment, and when the base station does not share the second predetermined rule with the user equipment, the base station Determine the number of resource elements occupied by each eCCE based on the second predetermined rule, and send second information to the user equipment, the second information indicating the eCCE occupied by the user equipment and the eCCE occupied by the user equipment and the user equipment receives the second information from the base station, and determines the eCCE occupied by it and the number of resource elements occupied by the eCCE based on the second information.

The above embodiments describe a method for flexibly configuring the number of eCCEs in a physical resource block pair, whereby the number of eCCEs can be flexibly configured according to available resource elements in the current physical resource block pair, thus optimizing the implementation process.

According to a preferred embodiment of the present invention, the first predetermined rule and/or the second predetermined rule includes minimizing the difference between the number of resource elements occupied by each eCCE. Because if there are two or more eCCEs on a continuous resource, they will experience similar channel attenuation. Therefore, when the average number of resource elements occupied by each eCCE is a non-integer number, resource elements can be allocated to each eCCE by minimizing the difference between the number of resource elements occupied by each eCCE. For example, when 63 resource elements are available and there are two eCCEs, one eCCE may be allocated 31 resource elements, and the other eCCE may be allocated 32 resource elements. Although the second eCCE allocates one more resource element, the coding is very flexible in the actual system, and the base station can handle the above situation by, for example, adjusting the code rate and adjusting the power allocation (for example, adjusting the power of the last resource element).

According to a preferred embodiment of the present invention, the first number of eCCEs is 4, and the second number of eCCEs is 2. By configuring the number of eCCEs in this way, the number of eCCEs in the physical resource block pair can match the currently used aggregation level {1, 2, 3, 4} (aggregation level), thereby facilitating the realization of blind decoding of ePDCCH.

According to a preferred embodiment of the present invention, the first threshold is 72. Here, there are 168 resource elements in a physical resource block pair, and the demodulation of ePDCCH is based on the demodulation reference signal DM-RS (Demodulation Reference Signal) transmitted in the physical resource block allocated to the transmission of downlink control information, Currently, the DM-RS needs to occupy 24 resource elements, so there are still 144 resource elements remaining in the physical resource block pair, that is, there are at most 144 resource elements available in the physical resource block pair. It can be seen that 72 is an intermediate value. On the other hand, among the CCEs used in the existing PDCCH, each CCE has 36 resource elements. Therefore, selecting 72 is equivalent to selecting the amount of resource elements equivalent to the original two CCEs. Thus, it is convenient to improve the compatibility with the original configuration.

According to a preferred embodiment of the present invention, the method further includes step b: b. Determine the number of eREGs occupied by an eCCE and the number of resource elements occupied by each eREG.

According to a preferred embodiment of the present invention, the step b further includes: b11. determining the number of eREGs occupied by one eCCE as 4, and determining the average number of resource elements occupied by each eREG; and b12. when When the average number of resource elements occupied by each eREG is an integer, the average number of resource elements occupied by each eREG is determined as the number of resource elements occupied by each eREG, when the average number of resource elements occupied by each eREG When the number of occupied resource elements is non-integer, perform step b12-1 or b12-2: b12-1. The network entity includes a base station and a user equipment, and when the base station and the user equipment share a third predetermined rule, the base station and the user equipment determine the number of resource elements occupied by each eREG based on the third predetermined rule; b12-2. The network entity includes a base station and a user equipment, and when the base station When the third predetermined rule is not shared with the user equipment, the base station determines the number of resource elements occupied by each eREG based on the third predetermined rule, and sends third information to the user equipment, the first The third information indicates the number of resource elements occupied by each eREG occupied by the user equipment, and the user equipment receives the third information from the base station and determines the occupied resource elements based on the third information The number of resource elements occupied by each eREG.

The above embodiments describe a method for fixedly configuring the number of eREGs occupied by eCCEs in a physical resource block pair, thereby simplifying the implementation process.

According to a preferred embodiment of the present invention, the step b further includes: b21. When the determined number of resource elements occupied by the eCCE is higher than or equal to the second threshold, determine that an eCCE occupies a third number of eREGs, and determining an average number of resource elements occupied by each eREG, and determining that an eCCE occupies a fourth number of eREGs when the determined number of resource elements occupied by an eCCE is lower than the second threshold, and determining an average number of resource elements occupied by each eREG The number of resource elements occupied; and b22. When the average number of resource elements occupied by each eREG is an integer, the average number of resource elements occupied by each eREG is determined as the number of resource elements occupied by each eREG The number of resource elements, when the average number of resource elements occupied by each eREG is a non-integer, perform step b22-1 or b22-2: b22-1. The network entity includes a base station and a user equipment, and when When the base station and the user equipment share a fourth predetermined rule, the base station and the user equipment determine the number of resource elements occupied by each eREG based on the fourth predetermined rule; b22-2. The network The entity includes a base station and user equipment, and when the base station does not share a fourth predetermined rule with the user equipment, the base station determines the number of resource elements occupied by each eREG based on the fourth predetermined rule, and sends The user equipment sends fourth information, the fourth information indicates the number of resource elements occupied by each eREG occupied by the user equipment, and the user equipment receives the fourth information from the base station, And based on the fourth information, the number of resource elements occupied by each eREG is determined.

The above embodiments describe a method for flexibly configuring the number of eREGs occupied by eCCEs in a physical resource block pair, so that the resource elements available in the current physical resource block pair can be used, and then the average resource elements occupied by each eCCE The number of eREGs can be configured flexibly, thus optimizing the implementation process.

According to a preferred embodiment of the present invention, the third predetermined rule and/or the fourth predetermined rule includes minimizing the difference between the number of resource elements occupied by each eREG.

According to a preferred embodiment of the present invention, the third number of eREGs is 4, and the fourth number of eREGs is 2.

According to a preferred embodiment of the present invention, the second threshold is 16.

Through the preferred embodiment of the present invention, it can be compatible with some original configurations of the previous PDCCH, and at the same time accelerate the process of standardization.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 shows the flowchart of the method according to an embodiment of the present invention;

FIG. 2 shows a flowchart of a method for implementing step S1 in FIG. 1 according to an embodiment of the present invention;

FIG. 3 shows a flowchart of a method for implementing step S1 in FIG. 1 according to another embodiment of the present invention;

FIG. 4 shows a flowchart of a method for implementing step S2 in FIG. 1 according to an embodiment of the present invention; and

Fig. 5 shows a flowchart of a method for implementing step S2 in Fig. 1 according to another embodiment of the present invention.

In the figures, the same or similar reference numerals designate the same or corresponding parts or features throughout the different views.

Detailed ways

Fig. 1 shows a flowchart of a method according to an embodiment of the present invention. As shown in Figure 1, the method according to the present invention is basically composed of two parts, that is, step S1 determines the number of eCCEs in the physical resource block pair and the number of resource elements occupied by each eCCE and step S2 determines the eREG occupied by an eCCE and the number of resource elements occupied by each eREG. Steps S1 and S2 are implemented by a network entity. In the description of the present invention, network entities include base stations and user equipments.

FIG. 2 shows a flowchart of a method for implementing step S1 in FIG. 1 according to an embodiment of the present invention. In the embodiment described in FIG. 2 , four eCCEs are fixedly selected in one physical resource block pair.

Specifically, in step S101, the network entity determines the number of available resource elements in a physical resource block pair. There are 168 resource elements in a physical resource block pair, and the demodulation of ePDCCH is based on the demodulation reference signal DM-RS (Demodulation Reference Signal) transmitted in the physical resource block allocated to the transmission of downlink control information. Currently, DM- The RS needs to occupy 24 resource elements, so there are still 144 resource elements remaining in the physical resource block pair. Therefore, the network entity needs to determine the number of available resource elements among the 144 resource elements.

When the network entity is a base station, it will determine available resource elements in a physical resource block pair, for example, according to resource elements occupied by other signals in the physical resource block pair. Specifically, for example, it can determine available resource elements in a physical resource block pair according to the number of OFDM symbols occupied by the PDCCH, the number of antenna ports of the CRS, whether there is a CSI-RS in the physical resource block pair, and the like. Preferably, the base station can also determine whether PBCH and PSS/SSS are transmitted in the physical resource block pair to determine available resource elements in a physical resource block pair. Those skilled in the art should understand that the base station may determine available resource elements in a physical resource block pair in combination with one or more conditions described or not described herein.

When the network entity is a user equipment, since the user equipment will also know the existence of PDCCH, CRS, PSS, SSS, PBCH, CSI-RS and/or its configuration, the user equipment will also implicitly predict the available resources number of elements.

Next, the network entity divides the number of available resource elements by the number of eCCEs (here, 4) to determine the average number of resource elements occupied by each eCCE. For example, when 144 resource elements are available, the average number of resource elements occupied by each eCCE is 36; when 72 resource elements are available, the average number of resource elements occupied by each eCCE is 18, when When 106 resource elements are available, the average number of resource elements occupied by each eCCE is 26.5.

When the average number of resource elements occupied by each eCCE is an integer, the method proceeds to step S203. In step S203, the network entity determines the average number of resource elements occupied by each eCCE as the number of resource elements occupied by each eCCE. That is, for the case where 144 resource elements are available, the number of resource elements occupied by the four eCCEs is all determined as 36, 36, 36, and 36.

When the average number of resource elements occupied by each eCCE is a non-integer number, it is necessary to determine whether the base station and the user equipment share the first predetermined rule. When the base station and the user equipment share the first predetermined rule, the method enters step S204. Otherwise, go to step S205.

Specifically, for example, for 106 available resource elements, the average number of resource elements occupied by each eCCE is 26.5. If the base station and the user equipment share (predefine) the number of resource elements of 4 eCCEs in advance If the rules are respectively set as 26, 26, 27, and 27, then the base station and the user equipment can respectively determine the number of resource elements occupied by each of the four eCCEs according to the predetermined rule. Here, the predetermined rule is preferably to minimize the difference between the number of resource elements occupied by each eCCE. Of course, other applicable rules are not excluded here. For example, the predetermined rule shared by the base station and the user equipment may also be 28, 28, 25, 25.

When the base station and the user equipment do not share the above rules, the base station determines the number of resource elements occupied by each eCCE based on the predetermined rule, that is, determines 26, 26, 27, 27, and sends the first information, the first information indicates the eCCE occupied by the user equipment and the number of resource elements occupied by the eCCE (this information can be realized through the control information of the common search space (Common Searching Space, CSS) or through high-level signaling, For example, radio resource control signaling (Radio Resource Control, RRC) to send). Subsequently, the user equipment determines the eCCE occupied by it and the number of resource elements occupied by the eCCE based on the first information.

In another variant embodiment, when the base station determines the number of resource elements occupied by each eCCE with a rule different from the first predetermined rule, for example, in the above example, the number of resource elements of the four eCCEs are respectively When it is set to 28, 26, 25, 27 or 30, 22, 27, 27, etc., the base station may also inform the user equipment of the above configuration through the first information, so that the user equipment can perform subsequent operations.

In another variant embodiment, if the four eCCEs respectively correspond to, for example, two user equipments, then preferably, the base station needs to send information to the two user equipments respectively, so as to tell the two user equipments about their corresponding eCCEs and the corresponding number of resource elements in the eCCE, so as to avoid unnecessary excessive blind decoding of the user equipment.

Therefore, through step S205, the user equipment may receive the first information from the base station and determine the eCCE occupied by it and the number of resource elements occupied by the eCCE according to the situation that there is no predetermined sharing rule. Certainly, even in the case that there are multiple user equipments, the user equipments can know the eCCEs occupied by other user equipments and the number of resource elements occupied by the eCCEs through appropriate signaling.

To sum up, in the steps shown in FIG. 2 , the base station and the user equipment (network entity) can independently implement steps S201 , S202 , S203 and S204 . Only in step S205, the base station needs to send additional messages to interact with the user equipment, so as to complete eCCE configuration for ePDCCH.

FIG. 3 shows a flowchart of a method for implementing step S1 in FIG. 1 according to another embodiment of the present invention. The embodiment shown in Figure 3 describes a method for flexibly configuring the number of eCCEs in a physical resource block pair, whereby the number of eCCEs can be flexibly configured according to the available resource elements in the current physical resource block pair, thus optimizing the implementation process.

Specifically, step S301 is similar to step S201 in FIG. 2 , the network entity determines the number of available resource elements in a physical resource block pair. The determination process is similar to the process in step S201 and will not be described in detail here.

In step S302, when the number of available resource elements is higher than or equal to the first threshold, the network entity determines the first number of eCCEs, and determines the average number of resource elements occupied by each eCCE based on the first number of eCCEs , when the number of available resource elements is lower than the first threshold, the network entity determines a second number of eCCEs, and determines the average number of resource elements occupied by each eCCE based on the second number of eCCEs.

Specifically, here for the sake of example, the first number of eCCEs is set to 2, the second number of eCCEs is set to 4, and the first threshold is set to 72. It should be pointed out that these values are only preferred (the advantages of which have been described above, and will not be described in detail here), rather than limiting. Selecting other threshold values and/or the number of eCCEs does not affect the implementation of the program. For example, the first threshold may be set to 80, 90, etc., the first number of eCCEs is set to 3, the second number of eCCEs is set to 6, and other suitable values, all of which depend on the specific implementation of the scheme. For example, the ePDCCH may not be transmitted in this frame if the number of resource elements included in the eCCE is too small.

In the following, the first number of eCCEs is 2, the second number of eCCEs is 4, and the first threshold is 72 for discussion.

Specifically, Table 1 and Table 2 respectively show the configuration situation of eCCE without PBCH, PSS, SSS in the physical resource block pair and the configuration situation of eCCE with PBCH, PSS, SSS in the physical resource block pair (here, Table 1 and Table 2 are only used to specifically illustrate the present invention and are not limiting). In addition, since in the standard process, it will be discussed whether to transmit ePDCCH in the case of PBCH, PSS, and SSS in the physical resource block pair, so the configuration of eCCE is classified into Table 1 and Table 2 here.

Table 1 (no PBCH, PSS, SSS in the physical resource block pair)

Table 2 (with PBCH, PSS, SSS in the physical resource block pair)

In Tables 1 and 2, the first row indicates the number of PDCCH symbols (number of occupied REs), number of CRS ports (number of required REs), PBCH, PSS/SSS, CSI-RS and The average number of REs contained in each eCCE in the case of a physical resource block pair with 4 eCCEs and 2 eCCEs, where REs represent resource elements. In the table, Yes means yes, and No means no.

Referring to Table 1 and Table 2, it should be pointed out that the configuration of the CSI-RS is very flexible. In Table 1 and Table 2, the CSI-RS is set to occupy 8 resource elements, which is just an example. In practice, the number of resource elements occupied by the CSI-RS can be changed according to the configuration of the base station. Also, since PDCCH decoding is done via CRS, there is no need for PDCCH without CRS. For the scores that appear in Tables 1 and 2, such as 31.5, this does not indicate that there is half a resource element, but only the number of resource elements that each eCCE occupies on average, for example, in the case of 4 eCCEs, this The four eCCEs may have 31, 32, 31, and 32 resource elements respectively. In addition, the rightmost sides of Table 1 and Table 2 show that each physical resource block pair has 4 eCCEs and 2 eCCEs. This is just to facilitate the blind decoding of the user equipment, so it does not exclude the situation in Table 1. and other numbers of eCCEs not shown in Table 2.

In addition, those skilled in the art should easily understand that, in the various situations shown in Table 1 and Table 2, the resource element values occupied by various signals can be obtained according to the frame structure, and therefore can be obtained as shown in Table 1. and the number of available resource elements in the physical resource block pair shown in Table 2, which will not be described in detail here.

For example, referring to row 7 in Table 1, PDCCH occupies one OFDM symbol (occupies 10 resource elements), CRS has one antenna port (occupies 8 resource elements), and does not have the situation of PBCH and PSS/SSS, then by The number of currently available resource elements in this situation is 126 by subtracting 18 from 144 resource elements after excluding 24 DM-RSs that need to occupy 24 resource elements. And since 126 is greater than the threshold 72, 4 eCCEs will be selected. By dividing 126 by 4, the average number of resource elements occupied by each eCCE (ie, 31.5 in this example) can be obtained. As another example, referring to row 45 in Table 2, the PDCCH occupies two OFDM symbols (occupying 22 resource elements), the CRS has one antenna port (occupying 8 resource elements), and has PBCH (occupying 46 resource elements). In the case of PSS/SSS, the number of currently available resource elements in this situation is 68 by subtracting 76 from 144 resource elements after excluding the 24 resource elements occupied by 24 DM-RSs. And since 68 is less than the threshold 72, 2 eCCEs will be selected, and by dividing 68 by 2, the average number of resource elements occupied by each eCCE (ie, 34 in this example) can be obtained.

In a preferred embodiment, the network entities (base station and user equipment) all have Table 1 and Table 2, and according to the rules of step S302, configure the eCCE with the help of Table 1 and Table 2, such as selecting the number of eCCE, Determine the average number of resource elements per eCCE. Of course, the base station and the user equipment can also calculate the number of eCCEs in real time according to the currently available resource elements instead of Table 1 and Table 2, and determine the average number of resource elements occupied by each eCCE.

To sum up, the base station and the user equipment can determine the number of eCCEs through step S301 and step S302, and thus determine the average number of resource elements occupied by each eCCE.

Next, when the average number of resource elements occupied by each eCCE is an integer, the method enters step S303.

Step S303 is similar to step S203. In step S303, the network entity determines the average number of resource elements occupied by each eCCE as the number of resource elements occupied by each eCCE. That is, for the case where 144 resource elements are available, the number of resource elements occupied by the four eCCEs is all determined as 36, 36, 36, and 36.

Similar to the related steps shown in FIG. 2 , when the average number of resource elements occupied by each eCCE is a non-integer number, it is necessary to determine whether the base station and the user equipment share the second predetermined rule. When the base station and the user equipment share the second predetermined rule, the method enters step S304. Otherwise, go to step S305. Here, it should be pointed out that the second predetermined rule here may be the same as or different from the above first predetermined rule.

Step 304 is similar to the corresponding step 204 in FIG. 2. For example, in the case of 4 eCCEs above, the average resource element occupied by each eCCE is 31.5. If the base station and the user equipment have pre-shared (predefined) The number of resource elements of the 4 eCCEs is set to the rule of 31, 32, 31, and 32 respectively, then the base station and the user equipment can respectively determine the number of resource elements occupied by each of the 4 eCCEs according to the predetermined rule. quantity. Here, the predetermined rule is preferably to minimize the difference between the number of resource elements occupied by each eCCE. Of course, other applicable rules are not excluded here. For example, the predetermined rule shared by the base station and the user equipment may also be 32, 32, 32, 30.

However, when the base station and the user equipment do not share the above rule, the base station determines the number of resource elements occupied by each eCCE based on the predetermined rule, that is, determines 31, 32, 31, 32, and sends the second information, the second information indicates the eCCE occupied by the user equipment and the number of resource elements occupied by the eCCE (this information can be realized through the control information of the common search space (Common Searching Space, CSS) or through high-level signaling, For example, radio resource control signaling (Radio Resource Control, RRC) to send). Subsequently, the user equipment determines the eCCE occupied by it and the number of resource elements occupied by the eCCE based on the second information.

In another variant embodiment, when the base station determines the number of resource elements occupied by each eCCE with a rule different from the first predetermined rule, for example, in the above example, the number of resource elements of the four eCCEs are respectively When it is set to 33, 33, 30, 30 or 33, 32, 31, 30, etc., the base station may also inform the user equipment of the above configuration through the second information, so that the user equipment can perform subsequent operations.

In another variant embodiment, if the four eCCEs respectively correspond to, for example, two user equipments, then preferably, the base station needs to send information to the two user equipments respectively, so as to tell the two user equipments about their corresponding eCCEs and the corresponding number of resource elements in the eCCE, so as to avoid unnecessary excessive blind decoding of the user equipment.

Therefore, through step S305, the user equipment may receive the second information from the base station without sharing a predetermined rule, and determine the eCCE occupied by it and the number of resource elements occupied by the eCCE accordingly. Certainly, even in the case that there are multiple user equipments, the user equipments can know the eCCEs occupied by other user equipments and the number of resource elements occupied by the eCCEs through appropriate signaling.

To sum up, in the steps shown in FIG. 3 , the base station and the user equipment (network entity) can independently implement steps S301 , S302 , S303 and S304 . Only in step S205, the base station needs to send additional messages to interact with the user equipment, so as to complete eCCE configuration for ePDCCH.

FIG. 4 shows a flowchart of a method for implementing step S2 in FIG. 1 according to an embodiment of the present invention. In the embodiment described in FIG. 4 , the number of eREGs occupied by one eCCE is fixedly determined to be four.

Specifically, in step S401, the network entity determines the number of eREGs occupied by one eCCE as 4, and determines the average number of resource elements occupied by each eREG. For example, by referring to the embodiment described in FIG. 2 or FIG. 3 , the number of resource elements occupied by each eCCE can be determined. Therefore, the number of resource elements occupied by eCCEs can be divided by the number of eREGs (here, 4), so as to determine the average number of resource elements occupied by each eREG. For example, in the above case where there are 4 eCCEs, and the 4 eCCEs have 31, 32, 31, and 32 resource elements respectively, the above values are divided by 4, so that in the case of 31 eCCEs, the average The number of resource elements occupied by an eREG is 7.75, and in the case that the eCCE has 32 resource elements, the average number of resource elements occupied by each eREG is 8.

When the average number of resource elements occupied by each eCCE is an integer, the method proceeds to step S402. In step S402, the network entity determines the average number of resource elements occupied by each eREG as the number of resource elements occupied by each eREG. That is, in the case where the average number of resource elements occupied by each eREG is 8, the numbers of resource elements occupied by the four eCCEs are all determined as 8, 8, 8, and 8.

When the average number of resource elements occupied by each eREG is a non-integer number, it is necessary to determine whether the base station and the user equipment share a third predetermined rule. When the base station and the user equipment share the third predetermined rule, the method enters step S403. Otherwise, go to step S404.

Specifically, for example, for the situation that the average number of resource elements occupied by each eREG is 7.75, if the base station and the user equipment share in advance (predefined) set the number of resource elements of 4 eREGs to 8 and 8 respectively , 8, and 7, the base station and the user equipment can respectively determine the number of resource elements occupied by each of the four eREGs according to the predetermined rule. Here, the predetermined rule is preferably to minimize the difference between the number of resource elements occupied by each eREG. Of course, other applicable rules are not excluded here. For example, the predetermined rule shared by the base station and the user equipment may also be 9, 8, 7, 7.

When the base station and the user equipment do not share the above rules, the base station determines the number of resource elements occupied by each eCCE based on the predetermined rule, that is, determines 8, 8, 8, and 7, and sends the third information, the third information indicates the number of resource elements occupied by each eREG occupied by the user equipment (this information can be implemented, for example, through the control information of the common search space (CommonSearching Space, CSS) or through high-level signaling, such as wireless Resource control signaling (Radio Resource Control, RRC) to send). Subsequently, the user equipment determines the number of resource elements occupied by each eREG it occupies based on the third information.

In another variable embodiment, when the base station determines the number of resource elements occupied by each eREG by a rule different from the third predetermined rule, for example, in the above example, the number of resource elements of the four eREGs are respectively When it is set to 6, 8, 8, 9, etc., the base station may also inform the user equipment of the above configuration through the third information, so that the user equipment can perform subsequent operations.

Therefore, through step S404, the user equipment may receive the third information from the base station without sharing a predetermined rule, and determine the eREG occupied by it and the number of resource elements occupied by the eREG accordingly.

To sum up, in the steps shown in FIG. 4 , the base station and the user equipment (network entity) can implement steps S401 , S402 , and S403 independently, respectively. Only in step S405, the base station needs to send additional messages to interact with the user equipment, so as to complete the configuration of the eREG, that is, the configuration of the eCCE used for the ePDCCH.

Fig. 5 shows a flowchart of a method for implementing step S2 in Fig. 1 according to another embodiment of the present invention. The embodiment shown in FIG. 5 describes a method for flexibly configuring the number of eREGs occupied by eCCEs in a physical resource block pair, so that according to the available resource elements in the current physical resource block pair, and further according to the average The number of eREGs can be flexibly configured according to the number of resource elements, thus optimizing the implementation process.

Specifically, in step 501, using the number of resource elements occupied by each eCCE determined according to the embodiment described in FIG. 2 or FIG. 3, when the determined number of resource elements occupied by eCCEs is higher than or equal to the When the second threshold is reached, the network entity determines that an eCCE occupies a third number of eREGs, and determines the average number of resource elements occupied by each eREG. When the determined number of resource elements occupied by an eCCE is lower than the second threshold, the network entity It is determined that an eCCE occupies a fourth number of eREGs, and an average number of resource elements occupied by each eREG is determined.

Specifically, for the sake of example here, the third number of eREGs is set to 4, the fourth number of eREGs is set to 2, and the second threshold is set to 16. It should be pointed out that these numerical values are only preferred, not limiting, nor fixed. Those skilled in the art should understand that selecting other thresholds or the number of eREGs will not affect the implementation of the scheme. In the following discussion, the third number of eREGs is 2, the fourth number of eREGs is 4, and the second threshold is 16 as an example for discussion.

Specifically, when the number of resource elements occupied by eCCEs is, for example, 36, since 36 is greater than 16, the number of eREGs is set to 4, and the average number of resource elements occupied by each eREG is determined to be 9 (by setting 36 resource elements divided by 4 eREGs). However, when the number of resource elements occupied by eCCEs is, for example, 15, the number of eREGs is set to 2, and the average number of resource elements occupied by each eREG is determined to be 7.5.

To sum up, the base station and the user equipment can determine the number of eREGs through step S501, and thus determine the average number of resource elements occupied by each eREG.

Next, when the average number of resource elements occupied by each eREG is an integer, the method enters step S502. In step S502, the network entity determines the average number of resource elements occupied by each eREG as the number of resource elements occupied by each eREG. That is, for the case where the number of resource elements occupied by eCCE is, for example, 36, and the average number of resource elements occupied by each eREG is 9, the number of resource elements occupied by the four eREGs is determined as 9, 9, and 9 ,9.

When the average number of resource elements occupied by each eREG is a non-integer number, it is necessary to determine whether the base station and the user equipment share the fourth predetermined rule. When the base station and the user equipment share the fourth predetermined rule, the method enters step S503. Otherwise, go to step 504. Here, it should be pointed out that the fourth predetermined rule here may be the same as or different from the above third predetermined rule.

Specifically, similar to step S404 in FIG. 4 , for the situation that there are 4 eREGs and the average number of resource elements occupied by each eREG is 7.75, if the base station and the user equipment have pre-shared (predefined) Set the number of resource elements of the 4 eREGs to the rule of 8, 8, 8, and 7 respectively, then the base station and the user equipment can respectively determine the resource elements occupied by each of the 4 eREGs according to the predetermined rule quantity. Here, the predetermined rule is preferably to minimize the difference between the number of resource elements occupied by each eREG. Of course, other applicable rules are not excluded here. For example, the predetermined rule shared by the base station and the user equipment may also be 9, 8, 7, 7.

When the base station and the user equipment do not share the above rules, the base station determines the number of resource elements occupied by each eCCE based on the predetermined rule, that is, determines 8, 8, 8, and 7, and sends the fourth information, the fourth information indicates the number of resource elements occupied by each eREG occupied by the user equipment (this information can be implemented, for example, through the control information of the common search space (CommonSearching Space, CSS) or through high-level signaling, such as wireless Resource control signaling (Radio Resource Control, RRC) to send). Subsequently, the user equipment determines the number of resource elements occupied by each eREG it occupies based on the fourth information.

In another variable embodiment, when the base station determines the number of resource elements occupied by each eREG by a rule different from the fourth predetermined rule, for example, in the above example, the number of resource elements of the four eREGs are respectively When it is set to 6, 8, 8, 9, etc., the base station may also inform the user equipment of the above configuration through the fourth information, so that the user equipment can perform subsequent operations. Therefore, through step S505, the user equipment can receive the fourth information from the base station without sharing a predetermined rule, and determine the number of resource elements occupied by the eREG occupied by it.

To sum up, in the steps shown in FIG. 5 , the base station and the user equipment (network entity) can implement steps S501 , S502 , and S503 independently, respectively. Only in step S504, the base station needs to send additional messages to interact with the user equipment, so as to complete the configuration of the eREG, that is, the configuration of the eCCE used for the ePDCCH.

Those skilled in the art should understand that the above-mentioned embodiments are illustrative rather than restrictive. Different technical features in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other modified embodiments of the disclosed embodiments on the basis of studying the drawings, specification and claims. For example, the predefined steps and shared steps may also be replaced by sending related signaling subsequently, and vice versa.

In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to indicate names rather than to indicate any specific Order. Any reference signs shall not be construed as limiting the scope of protection. The functions of several parts appearing in the claims can be realized by a single part.

Claims (12)

1. in the network entity of communication system, be configured for a method of the eCCE of ePDCCH, wherein, said method comprising the steps of:

A. determine the quantity of the resource element that the quantity of eCCE of Physical Resource Block centering and each eCCE are shared.

2. method according to claim 1, is characterized in that, described step a further comprises:

A11. determine the quantity of the resource element that described Physical Resource Block centering can be used; And

A12. the quantity of the eCCE of described Physical Resource Block centering is defined as to 4, and the quantity of the eCCE based on determined Physical Resource Block centering is determined the quantity of the resource element that average each eCCE is shared; And

A13. when the quantity of the shared resource element of described average each eCCE is integer, the quantity of the shared resource element of described average each eCCE is defined as to the quantity of the shared resource element of each eCCE, when the quantity of the shared resource element of described average each eCCE is non-integer, execution step a13-1 or a13-2:

A13-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the first pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eCCE is shared based on described the first pre-defined rule;

A13-2. described network entity comprises base station and subscriber equipment, and when the first pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eCCE is shared is determined in described base station based on described the first pre-defined rule, and send the first information to described subscriber equipment, the described first information is indicated the quantity of the shared eCCE of described subscriber equipment and the shared resource element of this eCCE, and described subscriber equipment receives the described first information from described base station, and based on the described first information, determine the quantity of eCCE that it is shared and the shared resource element of this eCCE.

3. method according to claim 1, is characterized in that, described step a further comprises:

A21. determine the quantity of the resource element that described Physical Resource Block centering can be used;

A22. when the quantity of described available resource element is during greater than or equal to first threshold, determine the eCCE of the first quantity, and the eCCE based on described the first quantity determines the quantity of the resource element that average each eCCE is shared, when the quantity of described available resource element is during lower than described first threshold, determine the eCCE of the second quantity, and the eCCE based on described the second quantity determines the quantity of the resource element that average each eCCE is shared; And

A23. when the quantity of the shared resource element of described average each eCCE is integer, the quantity of the shared resource element of described average each eCCE is defined as to the quantity of the shared resource element of each eCCE; When the quantity of the shared resource element of described average each eCCE is non-integer, execution step a23-1 or a23-2:

A23-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the second pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eCCE is shared based on described the second pre-defined rule;

A23-2. described network entity comprises base station and subscriber equipment, and when the second pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eCCE is shared is determined in described base station based on described the second pre-defined rule, and send the second information to described subscriber equipment, described the second information is indicated the quantity of the shared eCCE of described subscriber equipment and the shared resource element of this eCCE, and described subscriber equipment receives described the second information from described base station, and based on described the second information, determine the quantity of eCCE that it is shared and the shared resource element of this eCCE.

4. according to the method in claim 2 or 3, it is characterized in that, described the first pre-defined rule and/or described the second pre-defined rule comprise the difference between the quantity that minimizes the shared resource element of each eCCE.

5. method according to claim 3, is characterized in that, the eCCE of described the first quantity is 4, and the eCCE of described the second quantity is 2.

6. method according to claim 3, is characterized in that, described first threshold is 72.

7. according to the method in claim 2 or 3, it is characterized in that, described method also comprises step b:

The quantity of the resource element that the quantity of the eREG that b. a definite eCCE occupies and each eREG are shared.

8. method according to claim 7, is characterized in that, described step b further comprises:

The quantity of the eREG that b 11. occupies an eCCE is defined as 4, and determines the quantity of the resource element that average each eREG is shared; And

B12. when the quantity of the shared resource element of described average each eREG is integer, the quantity of the shared resource element of described average each eREG is defined as to the quantity of the shared resource element of each eREG, when the quantity of the shared resource element of described average each eREG is non-integer, execution step b12-1 or b12-2:

B12-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the 3rd pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eREG is shared based on described the 3rd pre-defined rule;

B12-2. described network entity comprises base station and subscriber equipment, and when the 3rd pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eREG is shared is determined in described base station based on described the 3rd pre-defined rule, and send the 3rd information to described subscriber equipment, described the 3rd information is indicated the quantity of the shared resource element of each shared eREG of described subscriber equipment, and described subscriber equipment receives described the 3rd information from described base station, and based on described the 3rd information, determine the quantity of the resource element that its each shared eREG is shared.

9. method according to claim 7, is characterized in that, described step b further comprises:

B21. when the quantity of the shared resource element of determined eCCE is during greater than or equal to Second Threshold, determine that an eCCE occupies the eREG of the 3rd quantity, and determine the quantity of the resource element that average each eREG is shared, when the quantity of the shared resource element of determined eCCE is during lower than described Second Threshold, determine that an eCCE occupies the eREG of the 4th quantity, and determine the quantity of the resource element that average each eREG is shared; And

B22. when the quantity of the shared resource element of described average each eREG is integer, the quantity of the shared resource element of described average each eREG is defined as to the quantity of the shared resource element of each eREG, when the quantity of the shared resource element of described average each eREG is non-integer, execution step b22-1 or b22-2:

B22-1. described network entity comprises base station and subscriber equipment, and when described base station and shared the 4th pre-defined rule of described subscriber equipment, described base station and described subscriber equipment are determined the quantity of the resource element that each eREG is shared based on described the 4th pre-defined rule;

B22-2. described network entity comprises base station and subscriber equipment, and when the 4th pre-defined rule is not shared with described subscriber equipment in described base station, the quantity of the resource element that each eREG is shared is determined in described base station based on described the 4th pre-defined rule, and send the 4th information to described subscriber equipment, described the 4th information is indicated the quantity of the shared resource element of each shared eREG of described subscriber equipment, and described subscriber equipment receives described the 4th information from described base station, and based on described the 4th information, determine the quantity of the resource element that its each shared eREG is shared.

10. method according to claim 8 or claim 9, is characterized in that, described the 3rd pre-defined rule and/or described the 4th pre-defined rule comprise the difference between the quantity that minimizes the shared resource element of each eREG.

11. methods according to claim 9, is characterized in that, the eREG of described the 3rd quantity is 4, and the eREG of described the 4th quantity is 2.

12. methods according to claim 9, is characterized in that, described Second Threshold is 16.

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