WO2013000311A1 - Method and device for transmitting pdcch - Google Patents

Abstract

Embodiments of the present invention relate to the technical field of wireless communications, and relates specifically to a method and device for transmitting a PDCCH, applicable in solving the problem in the prior art of strong interference among cells in a downlink control region. The method of the embodiments of the present invention comprises: dividing, on the basis of a normalized transmission power value of the PDCCH, all subframes within a resource planning period into multiple subframe sets; determining, on the basis of the result of comparing the transmission power value to a normalized power threshold value of the PDCCH of strong interference, a transmission parameter of a subframe bearing the PDCCH among each subframe set, and transmitting the PDCCH on the basis of the corresponding transmission parameter; where the PDCCH of strong interference is the corresponding PDCCH having the transmission power value thereof being greater than a first threshold value. Because the interference among the cells is taken into consideration when determining the transmission parameter of the subframe bearing the PDCCH, the interference among the cells of the downlink control region is thus reduced.

Description

 Method and apparatus for transmitting PDCCH This application claims priority to Chinese patent application filed on June 29, 2011, the Chinese Patent Office, Application No. 201110180115.X, entitled "A Method and Apparatus for Transmitting PDCCH" The entire contents of which are incorporated herein by reference. Technical field

 The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for transmitting a PDCCH.

Background technique

 The LTE (Long Term Evolution) system adopts OFDM (Orthogonal Frequency Division Multiplexing) technology, and the problem of interference in the small area is basically solved, but at the cost of inter-cell interference ( ICI, Inter-Cell Interference) may be more serious than traditional 3G systems.

 Generally, the method for solving inter-cell interference is to use frequency multiplexing, that is, different frequency bands are used between adjacent cells to form a network.组 The traditional frequency reuse factor 3, 4, 7 networking method presents a great challenge to the LTE system with system bandwidth up to 20MHz: In the 20MHz bandwidth scenario, if the frequency reuse factor is 3, The bandwidth required for an LTE system is as high as 60 MHz. Obviously, in today's increasingly scarce frequency resources, it is not very realistic to require such a large transmission bandwidth.

 In order to realize the networking mode with the frequency reuse factor of 1 as much as possible, the technology of multi-cell interference reduction (IM) is studied in the standardization process of LTE, and the uplink and downlink semi-static ICIC (Inter) is performed. -Cell Interference Coordination, the required load information is standardized.

 Since the resources of the PDCCH (Physical Downlink Control Channel) are very limited, based on the current LTE co-frequency networking, the performance guarantee of the control channel will become the bottleneck and key of the LTE co-frequency networking: In the network, after the network load reaches a certain level, the probability that the PDCCH channel is strongly interfered by the neighboring cell is extremely large. Therefore, it is very likely that the receiving channel is limited to the control channel. The scheduling and resource allocation information of the uplink and downlink shared channels are carried by the PDCCH. If the correct reception of the PDCCH cannot be ensured, the handover and normal data transmission of the user cannot be performed, which greatly affects the QoS of the user service. Of Service, service shield).

Since the PDCCH needs to be sub-block interleaved and cyclically shifted, it is difficult to find the correspondence between the CCE logical index and the REG physical resource index. Therefore, the PDCCH cannot use a soft frequency multiplexing or partial frequency reuse strategy like a shared channel. In the existing PDCCH resource allocation scheme of the LTE system, how to reduce inter-cell interference is not considered. Therefore, the current PDCCH resource allocation scheme will generate relatively strong inter-cell interference in the downlink control region. Summary of the invention

 The embodiments of the present invention provide a method and a device for transmitting a PDCCH, which are used to solve the problem that the inter-cell interference between the downlink control areas existing in the prior art is relatively strong.

 A method for transmitting a PDCCH according to an embodiment of the present invention includes:

 And all the subframes in the resource planning period are divided into a plurality of subframe sets, where the transmit power value of the PDCCH is a transmit power value that is expected to be used when the PDCCH is sent to the user equipment, according to the transmit power value of the normalized PDCCH; Determining, by the comparison result of the transmit power value and the normalized power threshold of the strong-interference PDCCH, determining a transmit parameter that carries a PDCCH subframe in each subframe set, and transmitting a PDCCH according to the corresponding transmit parameter;

 The strong PDCCH is a PDCCH corresponding to the transmit power value being greater than the first threshold.

 An apparatus for transmitting a PDCCH according to an embodiment of the present invention includes:

 a resource set generating module, configured to divide all subframes in the resource planning time period into multiple subframe sets according to a transmit power value of the normalized PDCCH, where a transmit power value of the PDCCH is expected to be used when transmitting the PDCCH to the user equipment Transmit power value;

 And an adjusting module, configured to determine, according to the comparison result of the transmit power value and the normalized power threshold of the strong PDCCH, determine a transmit parameter that carries a PDCCH subframe in each subframe set, and send a PDCCH according to the corresponding transmit parameter. ;

 The strong PDCCH is a PDCCH corresponding to the transmit power value being greater than the first threshold.

 Since the interference between the cells is considered when determining the transmission parameter of the PDCCH subframe, the inter-cell interference in the downlink control region is reduced;

 Further, when performing the same-frequency networking, the coverage of the control channel can be improved, and the edge coverage area meets the missed detection probability of the PDCCH, thereby improving the uplink and downlink data transmission rate and user experience of the user equipment. DRAWINGS

 FIG. 1 is a schematic flowchart of a method for transmitting a PDCCH according to an embodiment of the present invention;

 2 is a schematic structural diagram of an apparatus for transmitting a PDCCH according to an embodiment of the present invention;

 3 is a schematic diagram of a downlink cell ID planning result of an ideal network topology structure according to an embodiment of the present invention;

4 is a schematic diagram of a static PDCCH resource set partitioning strategy of an FDD (Frequency Division Duplex) system according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a static PDCCH resource set partitioning strategy of a TDD (Time Division Duplex) system according to an embodiment of the present invention. detailed description

 The inventor found that based on the design concept of the PDCCH channel of the LTE system, for the time domain, the frequency domain, the airspace, and the power

For the resources of 4 dimensions: the frequency domain mapping of the above-mentioned sub-block interleaving and cyclic shifting makes the interference coordination/avoidance in the frequency domain extremely difficult, and the PDCCH channel uses the multi-antenna method of transmitting diversity, thus performing airspace The coordination is also basically impossible; therefore, if you want to optimize the performance of the PDCCH, there is not much room for optimization in the frequency domain and the airspace, and it is more feasible to start from the two dimensions of time domain and power.

 The present invention provides a CCIM (Control Channel Interference Mitigation) strategy, that is, the problem that the existing PDCCH resource allocation algorithm can not reduce the inter-cell interference and the downlink control channel interference is prone to occur. A scheme for transmitting a PDCCH in the embodiment of the present invention. The basic idea of the scheme is to start from the resources of the two domains of time domain and power. The control channels of multiple cells use PDCCH resources in a coordinated manner in the time domain, and fully consider the PDCCH signal to the neighboring cells in the process of resource usage. The interference is provided to achieve the purpose of strong interference avoidance of the control channel of the adjacent cell.

 In the embodiment of the present invention, all the subframes in the resource planning time period are divided into multiple subframe sets according to the normalized PDCCH transmit power value, where the transmit power value of the PDCCH is the transmit power that is expected to be used when transmitting the PDCCH to the user equipment. And determining, according to the comparison result of the transmit power value and the normalized power threshold of the strong-interference PDCCH, a transmit parameter that carries a PDCCH subframe in each subframe set, and sending a PDCCH according to the corresponding transmit parameter, where The strong PDCCH is a PDCCH corresponding to the transmit power value being greater than the first threshold. Since the interference between the cells is considered when determining the transmission parameters of the PDCCH subframe, the inter-cell interference in the downlink control region is reduced.

 The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

 As shown in FIG. 1, the method for transmitting a PDCCH in the embodiment of the present invention includes the following steps:

 Step 101: Perform resource planning according to a normalized PDCCH transmit power value (the subsequent transmit power values other than the adjusted transmit power value in the transmit parameter are all normalized transmit power values) All the subframes in the time segment are divided into multiple subframe sets, where the transmit power value of the PDCCH is a transmit power value that is expected to be used when transmitting the PDCCH to the user equipment;

Step 102: Determine, according to a comparison result of the transmit power value and a normalized power threshold of the strong-interference PDCCH, a transmit parameter that carries a PDCCH subframe in each subframe set, and send a PDCCH according to the corresponding transmit parameter, where The strong PDCCH is a PDCCH corresponding to the transmit power value being greater than the first threshold. Since the PDCCH interference is not always strong, the CCIM policy does not need to be always enabled. A preferred method is to activate the CCIM policy and perform the solution of the embodiment of the present invention when a certain condition is met. There are plans to proceed.

 In the same-frequency networking scenario, for a cell scene with limited interference, the downlink interference and the interference strength are closely related to the PDCCH resource utilization under the condition of a given cell radius: The lower the PDCCH resource utilization, the phase The lower the probability that the neighboring cell uses the same resource to transmit downlink control information, the lower the probability that the neighboring cell will generate strong interference due to resource "collision", so the adjacent cell receives the same frequency interference less; the PDCCH load is heavier, the resource The higher the utilization rate, the more the same frequency interference is affected by the downlink control region.

 Based on the above analysis, preferably, before step 101, the method further includes:

 And the second threshold value of the PDCCH resource utilization ratio of all user equipments in the cell (ie,

^TH CCIM _acti _V ate )' If it is determined that the sum of PDCCH resource utilizations of all user equipments in the cell is greater than the second threshold, it is determined that activation is possible; otherwise, it is determined that activation is not required.

 Preferably, the sum of the PDCCH resource utilization rates of the user equipment in the cell may be determined according to the formula 1:

PpDCCH usage ( ^W ) = β · PDCCH ^ ~ β) ' PpDCCH usage ( ^W - Equation 1.

The P _eeff is a value obtained by smoothing the sum of the PDCCH resource utilization ratios of all user equipments in the current cell; η is a PDCCH resource of all user equipments in the current cell in the period [(ny)T, nT) The sum of the utilization rates, n and y are positive integers, and y is not greater than n, where T is the period length of the PDCCH resource utilization rate of the user equipment;

 Since the time period in Equation 1 is [(ny)T, nT), correspondingly, if CCIM needs to be activated, the resource planning time period is [nT, (n+y)), that is, in step 101, according to the transmission The power value divides the subframe carrying the PDCCH in the time period [nT, (n+y)) into a plurality of subframe sets.

 The above-mentioned own cell is the current target cell, that is, a cell that needs to determine whether to activate CCIM.

 In the implementation, the statistical period T is set, the sum of the PDCCH resource utilization ratios of the local cells in the T is calculated, and smoothing is performed. According to the smoothed value, P is preferably in the range of 0 to 1; The value is 1.

If P person n) > TH _{CCIM acti} , the CCIM policy is activated in the time period [nT, (n+y)); otherwise, the CCIM policy is not activated. List two.

Manner 1: A PDCCH resource set partitioning strategy based on static planning. The typical application scenario of the PDCCH resource set partitioning scheme based on static programming is in the standard framework and is not supported.

The PDCCH uses neighboring cells between base stations in which information is exchanged. The basic idea of the strategy is to plan mutually orthogonal strong perturbation PDCCH resource sets for neighboring cells according to factors such as network topology structure and small area ID planning strategy.

 Preferably, in step 101, the number of subframes that need to carry the strong interference PDCCH in the resource planning period is determined. According to the determined number of subframes, the subframe in the resource planning period is divided into multiple subframe sets.

 After the subframe set is divided, it is required to determine which subframe set each cell corresponds to, and all subframes in the corresponding subframe set are used as subframes carrying the strong interference PDCCH.

 Preferably, step 101 and step 102 may further include:

All cells are divided into a plurality of cell sets, wherein the number of subframe sets is not less than a multiplexing coefficient ^ ϊ / _Cai of a subframe capable of carrying a strong interference PDCCH, and any two cells in the same cell set are in physical locations Not adjacent

 Determining a subframe set corresponding to each cell set, where each cell set corresponds to a different subframe set, and the number of subframes in the subframe set corresponding to each cell set is equal to the determined number of subframes, and each cell set The subframe in the corresponding subframe set is a subframe in the corresponding cell that carries the strong interference PDCCH.

 The following describes an example of the first method.

(1) determining a desired strong interference PDCCH resource multiplexing coefficient ^HI - ^PDCCH :

According to the four-color principle, =4 can ensure that the adjacent cells of any shape are orthogonal to each other. Therefore, for the conventional network topology, ⁷ TM ^CCff = 4 can be generally selected. For some more regular network topologies, you can choose =3.

 Assuming that the current network is an ideal topology, factors that need to be considered according to the cell ID planning (eg, primary and secondary synchronization sequences, uplink reference signal hopping patterns, etc.), and the cell ID planning result under the ideal topology structure is shown in FIG. 3. As shown, the number of each sector in the figure is the cell ID of the sector.

 Under the above network topology and cell ID planning results, in order to ensure that the neighboring cells are strongly interfered with each other, the PDCCH resources are orthogonal to each other.

Of

Select ^ffl-TMccff ₌₃ . At the same time, the same cell of ^^ mod x is divided into a cell set, where ^V is the cell identifier, x ^-PDCCH, that is, the relationship between the cell ID ^ ^" and the cell set can be obtained:

All cells with mocu = 划 are assigned to the cell set ci; all cells with ' ^{mod 3} = ¹ are assigned to the cell set C2;

All cells with N mod3 = 2 are assigned to the cell set C3; Among them, mod is the operation of the module.

 Therefore, for the network topology structure and the cell ID planning result of FIG. 3, the cell can be divided into three sets according to the above principle, and further combined with the static resource division, the strong perturbation resource set used by any neighboring cell can be guaranteed. cross.

 It should be noted that the first method is not limited to the division mode of the modulo value, and the embodiment of the present invention is applicable to any division manner in which any two cells in the same cell collection are not adjacent in physical position.

 (2) determining the subframe density reserved for the strong PDCCH transmission of the local cell:

According to the resource planning time period, the number of resources that need to carry the strong interference PDCCH in the current cell is divided by the number of PDCCH resources in one subframe, and the subframe that needs to leave the strong interference PDCCH in the resource planning period is obtained. Number. Assume that ^PDCCH = 3, the resource planning period is a radio frame: For an FDD system, one radio frame (10ms), three subframes carrying a strong interference PDCCH can be reserved for each cell; The number of subframes in which a PDCCH can be transmitted in a radio frame is related to the configuration of the uplink and downlink subframes. Considering that thousands of radio frames are used as the planning period, for example, for the uplink and downlink subframe configuration 1, there are 6 radio frames per antenna. A subframe in which a PDCCH is transmitted is reserved, and two subframes carrying a strong interference PDCCH are reserved for each cell within 10 ms.

 (3), planning mutually orthogonal strong perturbation PDCCH resources for neighboring cells

 Combining the descriptions in (1) and (2), under the ideal network topology shown in Figure 3, a resource set division method for ensuring orthogonal PDCCH resources in the neighboring region is orthogonal:

 For the FDD system, as shown in FIG. 4, it is assumed that each subframe in a radio frame is divided into four resource sets: Rl={sfi), sfi, sf6}, R2={sfl, sf4, sf7}, R3={ s£2 , sf5 , sf8}, R4={ s©} , where sfi) represents subframe 0, sfl represents subframe 1, and so on. For the cell in C1, the subframe set carrying the strong interference PDCCH is R1; for the cell in C2, the subframe set carrying the strong interference PDCCH is R2; for the cell in C3, the child carrying the strong interference PDCCH The frame set is R3; the resource set R4 is not used as a subframe set for any cell carrying a strong interference PDCCH.

 For the TDD system, as shown in FIG. 5, it is assumed that each downlink subframe in a radio frame is divided into three resource sets: Rl={sfi), sf5 }, R2={ sfl , sf6}, R3={ sf4 , s ©}. Then, for a cell in the CI, a subframe set carrying a strong interference PDCCH is R1; for a cell in C2, a subframe set carrying a strong interference PDCCH is R2; for a cell in C3, a subframe carrying a strong interference PDCCH The frame set is R3.

 Manner 2: Dynamic generation strategy of a PDCCH resource set based on inter-cell information.

 For mode 2, the user equipment needs to be divided into sets.

The PDCCH resource set dynamic generation policy based on inter-cell information is applicable to neighboring cells in the same base station Between, and between other neighboring cells that perform related PDCCH information interaction. The basic principle is: If the cell is activated

The CCIM policy, the real-time estimation of the cell that activates the CCIM policy may cause a resource usage requirement of the PDCCH that is strongly interfered, and determine which subframes need to be used by each cell in the resource planning time period to transmit a PDCCH that may cause strong interference to the neighboring cell. When determining the specific subframe position, it is necessary to consider the location of the strong cell PDCCH subframe of the neighboring cell.

 Since the LTE standard specifies that the PDCCH only supports multi-antenna mode of transmission diversity, the PDCCH channel usually uses omnidirectional transmission or sector shaping. At the same time, since the location of the base station is fixed, the interference caused by the PDCCH channel to the adjacent cell is directly dependent on the PDCCH transmit power amplitude and the cell coverage radius. In addition, the PDCCH channel of the user equipment supports four types of aggregation levels. When the eNB allocates PDCCH resources to the user equipment, the base station can dynamically adjust the selected aggregation level and the PDCCH transmission power: when the base station determines that a user equipment needs the PDCCH at the current time. When the number of bits transmitted is higher, the higher the aggregation level selected for the user equipment (that is, the greater the number of CCE resources), the smaller the energy required on each RE (Resource Element) of the PDCCH channel of the user equipment. The less the interference caused by the channel using the same RE resource for neighboring cells, and vice versa.

 For the above reasons, the PDCCH transmit power of the user equipment can be used to measure the interference contribution of the PDCCH of the user equipment to the neighboring cell, and the user equipment is divided into N (N>1, and the typical value is 2, 3). ) a collection.

 Preferably, before step 101, the method further includes:

 Determining, according to the correspondence between the configured user set and the power range value, a user set corresponding to the power range value to which the transmit power value corresponding to each user equipment in the current resource planning resource belongs;

 The user equipment is divided into a determined set of users.

Specifically, when the user set is divided, the transmit power EPRE (Energy Per Resource Element) value E _RS of the common reference symbol of the current cell is obtained. It is assumed that the EPRE of the PDCCH of the current user equipment is ^EpDCCH , and is normalized. Chemical:

_ ⁿ PDCCH

 P PDCCH-~; comparing the PDCCH transmit power of the normalized user equipment with the set threshold to determine which interference set the user equipment belongs to: Suppose that the user equipment is currently divided into N sets, and then set in advance N-1 set partition threshold

The specific value of the ^TH E_PDCCH (0 (2, ... N-1), ^TH E-PDCCH (determined according to the PDCCH power level of the network plan. If PH < ^TH E_PDCCH 0), the user equipment belongs to the set ^U ; If TH _E — _PDCCH (k) ≤ p _PDCCH < TH _{E PDCCH} (k + l), k — Ι, ., ., Ν— 2 , then the user equipment belongs to Collection ^Uk+

If THE_PDCCAN - ) ≤ p _PDCCH , the user equipment belongs to the set ^. For example, when N=2, according to the foregoing method, the PDCCH of the user equipment in the cell may be divided into two sets: a strong interference set and a low interference set ^; when _N =3, the user equipment in the cell may be used. According to the PDCCH, the interference contribution of the downlink control region of the neighboring area is divided into: strong interference set, medium interference set, low interference set.

 It should be noted that since the PDCCH channel can perform fast power adjustment, the division of the foregoing set is not static, but needs to be dynamically adjusted according to the real-time transmit power value of the PDCCH of the user equipment.

 Correspondingly, in step 101, the user set corresponding to the power range value to which the normalized power threshold of the strong PDCCH is belongs is determined according to the correspondence between the user set and the power range value;

 Determining, according to the determined set of users, the number of subframes that the local cell needs to carry the strong interference PDCCH;

 Determining a subframe carrying a strong interference PDCCH according to the determined number of corresponding subframes;

 The subframe carrying the strong PDCCH is divided into one subframe set, and the other subframes are divided into at least one subframe set.

 Specifically, the above steps can be subdivided into two steps:

 (1) Strong perturbation PDCCH resource usage requirement estimation:

 Preferably, the number of subframes of the PDCCH that the local cell needs to carry strong interference is determined according to formula 2:

CCE _ high _ int erfei

/ λ

/ λ

. Shang, CCE _PDCCH _Τ \ I Shang, subfr e-PDCCH _Τ \ formula 2 wherein the time period is _{^^, (m + z) Tl} ) in this cell needs to carry the number of sub-frames the PDCCH scrambled one thousand strong; m and z Is a positive integer, and z is not greater than m; ^CC£- ZngA- mt er/ is the time segment [(mz)Tl, mTl) all users in the cell that have greater interference intensity to neighboring cells than the second threshold PDCCH channel required by the device

The sum of the number of CCE resources; ^c^- ^{PZ)CC /} - ⁷¹ is the sum of the number of CCE resources available for the PDCCH channel in the time period [(mz)Tl , mTl); # PDCCH _τ\ is the time period [(mz)Tl , mTl The total number of downlink subframes that can be used for PDCCH transmission; T1 is the period length of the number of subframes in the cell where the user equipment needs to carry the PDCCH.

In the implementation, a period T1 for counting the number of subframes in which the user equipment needs to carry the PDCCH in the cell may be set. And a normalized power threshold of the strong interference PDCCH (the value can be set to i=l,

2, ... Ν-1), for the divided user set, HI_PDCCH ΤΗ _{Ε Η} {ί) , then the user set {^; [/' = Ζ + 1'···'Λ The pDCCH of all user equipments in the middle is a PDCCH that may cause strong interference to the neighboring cell. Assume that the N=3, E_PDCCH) threshold has two values, assuming 3 and ₈ , all belonging to less than 3,

3-8 belongs to U ₂ , and greater than or equal to 8 belongs to U ₃ ; —PDccH _=8, then the PDCCHs of all user equipments in u ₃ are PDCCHs that may cause strong interference to the neighboring cells. Typically, for a case where there are two user sets, that is, N=2, all the user equipments in the strong interference set ^3⁄4gA can be classified into the set ^1. For the case where there are three user sets, that is, N=3, the strong thousand can be All user devices in the scrambling set are classified into the set ^.

 Then, according to the number of subframes of the PDCCH determined by Equation 2, the strong perturbation PDCCH resource usage requirement of the local area in the time period [mTl, (m+z)Tl) is predicted.

 (2), strong perturbation PDCCH subframe determination:

 Preferably, after determining the number of subframes that the local cell needs to carry the strong interference PDCCH, the subframe of the PDCCH carrying the strong interference may be determined according to at least one of the following selection conditions:

 Selecting, from the subframe carrying the PDCCH, a subframe that is a PDCCH that does not carry a strong interference in the neighboring cell (that is, a PDCCH subframe that preferentially considers that the neighboring region does not generate strong interference);

 And selecting, from the subframe that carries the PDCCH, a subframe corresponding to the number of the neighboring cells that is smaller than the threshold, where the neighboring region corresponding to the subframe is the neighboring region of the subframe that carries the strongly PDCCH PDCCH (ie, for a certain subframe) For a subframe, if the number of cells that the neighboring cell will use to transmit the strong interference PDCCH is more, the probability of selecting the strong interference PDCCH for the subframe transmission should be reduced);

 Uniformly selecting a subframe that is a PDCCH carrying strong interference in the time domain (ie, in order to avoid affecting uplink and downlink data transmission as much as possible, the subframe reserved by the cell to the strong interference PDCCH should be in the frequency domain as much as possible Evenly distributed).

 For mode 2, the resources of the neighboring cells may be coordinated and used in a manner in which the PDCCHs of the subframes are strongly interfered with each other in the future.

For the first mode and the second mode, the resources are divided into at least two sets from the time domain: the subframes of the PDCCH that may carry the strong interference in a certain period of time are divided into one set ⁷ ^, and the other subframes carrying the PDCCH are divided into At least one collection ⁷ ^^-^C^. Among other PDCCH resource sets as needed

的子帧，可以为用户设备使用较高的功率、 较低的聚合等级来传输 PDCCH; 对于归属于 的子帧， 可以为用户设备 使用较低的功率、 较高的聚合等级来传输 PDCCH。 In order to ensure that the neighboring cells use the PDCCH resources in a coordinated manner, it is necessary to determine the usage rules of the PDCCH resources of the respective subframes. for

The subframe may be used by the user equipment to transmit the PDCCH by using a higher power and a lower aggregation level. For the subframe to which the user equipment belongs, the PDCCH may be transmitted by the user equipment using a lower power and a higher aggregation level.

 Preferably, in step 102, the sending parameters may include an aggregation level and/or a transmission power value, and there are two ways to determine a transmission parameter carrying a PDCCH subframe in each subframe set:

 Manner 1: The CCIM rule of the UE scheduling priority is not adjusted.

 Specifically, for the corresponding user equipment whose transmit power value is less than the normalized power threshold, the transmit power and the aggregation level are unchanged or the subframes of the PDCCH carrying the strong interference in each subframe set. The transmit power value is increased and the aggregation level is decreased, so that the adjusted transmission parameter ensures that the actual received signal to noise ratio of the user equipment is not lower than a third threshold (wherein each aggregation level is in each downlink control information bit number) There is a minimum receiving signal to noise ratio requirement (ie, the third threshold value), so that the adjusted transmission parameters ensure the receiving signal to noise ratio requirement of the user equipment);

For the user equipment whose corresponding transmit power value is not less than the normalized power threshold, the normalized power threshold is used on a subframe of a PDCCH that does not carry a strong interference in each subframe set. The value is used as the maximum value of the transmit power, and the aggregation level is increased, so that the adjusted transmission parameter ensures that the actual received signal-to-noise ratio of the user equipment is not lower than the third threshold. For example, the sub-frames in which: 3 and 3 are displayed, the user equipment whose normalized transmit power value is lower than the preset threshold value of ⁷⁷ ^- ⁷ ^^ can maintain its original transmit power and aggregation level. Alternatively, the transmit power may be appropriately raised and the PDCCH aggregation level may be lowered to save PDCCH resources; ), ³ dry ^mgh subframes, and the normalized transmit power value is higher than a preset threshold TH _{HI PDCCH} User equipment (ie, a collection of users whose PDCCH may cause strong interference to neighbors)

{^' | = z + i ''' All user equipments in N), the maximum transmit power needs to be limited to ⁷ ^ π - ρζ ^, and the PDCCH aggregation level is increased, that is, more PDCCH resources are used, lower The code rate guarantees the reliability of the PDCCH transmission; if the highest PDCCH aggregation level (L=8) is still not sufficient, the PDCCH resource allocation of the user equipment fails; the subframe belongs to the ^R High-M _nce — PDCCH. For the user equipment whose normalized transmit power value is not lower than the preset threshold value of ⁷ ^^ ⁷ ^^, no adjustment is made; In the subframe belonging to the ^R H ^ PDCCH , the adjustment is not performed for the user equipment whose normalized transmission power value is lower than the preset threshold value ⁷⁷ ^^^^.

 Manner 2: Adjust the CCIM rule of the UE scheduling priority.

 Specifically, for the user equipment whose corresponding transmit power value is not less than the normalized power threshold, the scheduling priority is higher than the corresponding subframe in the subframe of the PDCCH carrying the strong interference in each subframe set. And the user equipment whose transmit power value is smaller than the normalized power threshold, and the corresponding transmit power value and aggregation level of the user equipment whose transmit power value is smaller than the normalized power threshold Invariably, or increase the transmit power value and reduce the aggregation level, so that the adjusted transmit parameters ensure that the actual received signal-to-noise ratio of the user equipment is not lower than the third threshold;

 For the user equipment whose corresponding transmit power value is not less than the normalized power threshold, no scheduling is performed on the subframe of the PDCCH that does not carry the strong interference in each subframe set, or scheduling is performed but the scheduling is prioritized. The level is lower than the corresponding user equipment whose transmit power value is less than the normalized power threshold.

 D

For example, in a thousand frames belonging to the High-Merfw-PDCCH, the normalized transmit power value is higher than the preset threshold ^GGf/ , and the user equipment whose PDCCH may cause strong interference to the neighboring ^cell

The scheduling priority of all user equipments in {^•| ' = + 1,_N} is higher than the scheduling priority of user equipments belonging to other individual user sets (k=i, il, ..., l). At the same time, the PDCCH of the user equipment belonging to the other user sets can improve the transmission power and reduce the aggregation level, and can also keep its original transmission power and aggregation level unchanged. In a subframe belonging to the High-brterfere PDCCH, there are two processing schemes: ( _a ) A normalized user equipment whose transmit power value is higher than a preset threshold value of ⁷ ^^^^^ should not be scheduled ( That is, the PDCCH whose PDCCH may cause strong interference to the neighboring cell is { 1" ^{7 = 7 + 1} 'one user device in ^' ^) to avoid strong interference to the neighboring cell. For belonging to other user sets The user equipments of (k=i, il, ..., l) can be scheduled in these subframes. (b) The normalized transmit power value is higher than the preset threshold value. ⁷ ^^^^^ The user equipment (ie, the user set whose PDCCH may cause strong interference to the neighboring cell {^Ι· ⁷ . z' + ''^^^ ^) has a lower scheduling priority than the other user sets ^ The user equipment of (k=i, il, ..., l) needs to limit the PDCCH transmit power of the user equipment of the subframe, that is, the highest transmit power value is equal to ⁷ ^^- ⁷ ^^, to avoid Neighboring areas cause strong interference.

The executor of the embodiment of the present invention may be a base station (such as a macro base station, a home base station, etc.), or may be O&M (Operations & Maintenance) equipment.

 The scheme of the present invention will be described in detail below by way of a few examples.

Example 1: It is assumed that two user sets are divided, namely a strong perturbation set ^υ and a low perturbative set ^U. At the same time, the subframe carrying the PDCCH is divided into sets R1, R2, R3, and R4, and the second mode is selected when the parameter is sent. It is assumed that the original UE priority queues are UE1, UE2, UE3, UE4, and UE5, and UE2 and UE5 need to transmit PDCCH with higher power, and belong to the strong interference set, UE1, UE3, and UE5 belong to the low-interference set.

 For the cell in C1:

 The original UE priority queue is adjusted according to the home user set in each subframe in R1, and the adjusted UE priority queue is UE2, UE5, UE1, UE3, UE4; each UE in the queue after adjustment The PDCCH resources are allocated, and the UEs in (UE1, UE3, UE4) are allowed to transmit the PDCCH with a lower aggregation level and higher power.

 In other subframes, the original UE priority queue is adjusted according to the set of belonging users, and the adjusted

The UE priority queues are UE1, UE3, and UE4. The PDCCH resources are allocated to the UEs in the ^Uhw in this order, and some margins for the interference improvement of the neighboring cells are reserved in the resource allocation process.

 For cells in C2:

 The original UE priority queue is adjusted according to the home user set in each subframe in R2, and the adjusted UE priority queue is UE2, UE5, UE1, UE3, UE4; each UE in the queue after adjustment Distribution

The PDCCH resource, and allows the UE in (UE UE3, UE4) to transmit the PDCCH with a lower aggregation level and higher power.

 In other subframes, the original UE priority queue is adjusted according to the set of belonging users, and the adjusted

The UE priority queues are UE1, UE3, and UE4. The PDCCH resources are allocated to the UEs in this order, and some margins for the interference improvement of the neighboring cells are reserved in the resource allocation process.

 For cells in C3:

 The original UE priority queue is adjusted according to the home user set in each subframe in R3, and the adjusted UE priority queue is UE2, UE5, UE1, UE3, UE4; each UE in the queue after adjustment Distribution

The PDCCH resource, and allows the UE in (UE UE3, UE4) to transmit the PDCCH with a lower aggregation level and higher power.

In other subframes, the original UE priority queue is adjusted according to the set of belonging users, and the adjusted The UE priority queues are UE1, UE3, and UE4. The PDCCH resources are allocated to the UEs in this order, and some margins for the interference improvement of the neighboring cells are reserved in the resource allocation process.

Example 2: Assume that two sets of users are divided, namely a strong perturbation set ^υ and a low perturbative set ^U. At the same time, the subframe carrying the PDCCH is divided into sets R1, R2, R3, and R4, and the mode 1 is selected when the parameter is determined. It is assumed that the original UE priority queues are UE1, UE2, UE3, UE4, and UE5, and UE2 and UE5 need to transmit PDCCH with higher power, and belong to the strong interference set, UE1, UE3, and UE5 belong to the low-interference set.

 For the cell in C1:

Each subframe in R1 allocates PDCCH resources to the UE in order according to the original UE priority queue, and allows the UE in the ^^ to transmit the PDCCH with a lower aggregation level and higher power; in other subframes, according to the UE The priority queue allocates PDCCH resources to the UE in turn, and limits the PDCCH transmit power of the UEs in the ^Uh 's ^h (ie, UE2, UE5), and selects a higher aggregation level to ensure the transmission reliability of the PDCCH. If the PDCCH resource of level L=8 cannot meet the target SNR requirement of the receiver at the current transmit power limit, the PDCCH resource allocation fails.

 The cells in the other sets are similar, except that the subframes used by the respective strongly interfered PDCCHs are different.

 Example 3: Assume that three user sets are divided, namely strong perturbation set, medium perturbation set, and low perturbation set. At the same time, the subframes carrying the PDCCH are divided into sets R1, R2, and R3, and the second mode is determined when the parameters are sent, and the method of reducing power and increasing the aggregation level is attempted on the non-strongly-perplexed PDCCH subframe. The UEs in the UE are allocated PDCCH resources. The original UE priority queues are assumed to be UE1, UE2, UE3, UE4, UE5, and UE6. The UE2 and the UE5 need to transmit the PDCCH with higher power, and belong to the strong interference set UE1 and UE6. Attributable to the low-interference set, UE3, UE4 belong to the middle-pervasive set

 For each subframe that belongs to R1:

For cells belonging to C1, in accordance with the user belongs to a set of original UE priority queue is adjusted (the order of _{U exter ^ U medmte ^ U mt} er), UE priority queue adjusted to UE _2, UE5, UE3, UE4 , UE1, UE6; PDCCH resources are allocated to each UE in the adjusted queue in turn.

Ue ),调整后的 UE优先级队列为 UE3、 UE4、 UE1、 UE6、 UE2、 UE5 ; 依次为调整后的队列中的每个 UE分配 PDCCH资源。 For the cell belonging to C2, the original UE priority queue is adjusted according to the set of belonging users (sequence

Ue), the adjusted UE priority queue is UE3, UE4, UE1, UE6, UE2, UE5; and PDCCH resources are allocated to each UE in the adjusted queue in turn.

For attributable to C3 cell, set the original UE priority queue is adjusted (the order of _U mier UU _exter) according to the home user, UE priority queue adjusted to UE6, UE3, UE4, UE2, UE5; followed by adjustment Each UE in the subsequent queue allocates PDCCH resources.

 For each subframe that belongs to R2:

For cells belonging to C1, the set according to the home user is adjusted (the order of _U mier UU _exter) original UE priority queue, UE priority queue adjusted to UE6, UE3, UE4, UE2, UE5; followed by adjustment Each UE in the subsequent queue allocates PDCCH resources.

For cells belonging to the C2, in accordance with the home user set the original UE priority queue is adjusted (the order of _{U exter ^ U medmte ^ U mt} er), UE priority queue adjusted to UE _2, UE5, UE3, UE4 , UE1, UE6; PDCCH resources are allocated to each UE in the adjusted queue in turn.

),调整后的 UE优先级队列为 UE3、 UE4、 UE1、 UE6、 UE2、 UE5 ; 依次为调整后的队列中的每个 UE分配 PDCCH资源。 For the cell belonging to C3, the original UE priority queue is adjusted according to the set of belonging users (sequence

The adjusted UE priority queues are UE3, UE4, UE1, UE6, UE2, and UE5; and PDCCH resources are allocated to each UE in the adjusted queue in turn.

 For each subframe that belongs to R3:

),调整后的 UE优先级队列为 UE3、 UE4、 UE1、 UE6、 UE2、 UE5 ; 依次为调整后的队列中的每个 UE分配 PDCCH资源。 For the cell belonging to C1, the original UE priority queue is adjusted according to the set of belonging users (sequence

The adjusted UE priority queues are UE3, UE4, UE1, UE6, UE2, and UE5; and PDCCH resources are allocated to each UE in the adjusted queue in turn.

For cells belonging to the C2, in accordance with the home user set the original UE priority queue is adjusted (the order of U mier UU _exter), UE priority queue adjusted to UE6, UE3, UE4, UE2, UE5; followed by adjustment Each UE in the subsequent queue allocates PDCCH resources.

For cells belonging to C3, in accordance with the home user set the original UE priority queue is adjusted (the order of _{U exter ^ U medmte ^ U mt} er), UE priority queue adjusted to UE _2, UE5, UE3, UE4 , UE1, UE6; PDCCH resources are allocated to each UE in the adjusted queue in turn.

Example 4: It is assumed that two user sets are divided, that is, a strong perturbation set and a low perturbative set ^ ⁷ ^; a dynamic generation strategy of a PDCCH resource set based on inter-cell information is used to determine a mode 2 when transmitting parameters. It is assumed that the original UE priority queue is UE1, UE2, UE3, UE4, and UE5 in sequence, where UE2 and UE5 need to transmit PDCCH with higher power. Attributable to the strong perturbation set, UE1, UE3, UE5 belong to the low-interference set

 Assume that there are 6 possible strong-interference neighboring cells in the current cell, and the current system uses TDD uplink and downlink subframe configuration 1 to consider the inter-cell PDCCH strong interference information with minimum interval of 20 ms (that is, which cells may be in a certain period) A high PDCCH is updated in the subframe, and it is assumed that the number of strong PDCCH neighbors in each downlink subframe in the 20 ms period acquired by the current cell at a certain time is as shown in Table 1:

 Table 1: Example of the number of strong interfering neighbors acquired by a cell:

 It is assumed that the current cell according to the method for estimating the usage of the strong PDCCH resource in the embodiment of the present invention determines that the current PDCCH needs to occupy 6 PDCCH subframes for carrying the strong PDCCH in the 20 ms period. Then, for each downlink subframe in Table 1, the sort queues {s©, sf5, sfl0, sfl, sfl6, sfi), sfl4, sf4, sfl5, sfl4, sf4, sf5, sfl4, sf4, sf6} are sorted according to the number of thousands of neighboring neighboring cells. (sfi) represents subframe 0, and so on. The first 6 subframes in the queue are selected as the subframes that the current cell will use to carry the strong interference PDCCH, ie, {s, sf5, sfl0, sfl, sfl6, sfD } , and inform the neighboring cell of this information.

 D

Both the current cell, strong one thousand sub-carrier PDCCH scrambled frames set _{High-i nte rf erence -PDCCH =} si9 sf5, sflO, sfl, sfl6, sfi)}; set of subframes carrying the PDCCH scrambled one thousand strong non High- Erfe e - PDCCH = _{η 4} , , , _{gfl K sf6 }} .

D

The original UE priority queue is adjusted according to the home user set in each subframe of the High Me ce PDCCH, and the adjusted UE priority queue is UE2, UE5, UE1, UE3, and UE4; Each UE allocates PDCCH resources, and allows UEs in ^z ° ^w ( UE1, UE3, UE4) to transmit PDCCHs at a lower aggregation level and higher power in these subframes. In the High-Interference-PDCCH subframe, the original priority queue is adjusted according to the set of the home users, and the adjusted UE priority queues are UE1, UE3, UE4, UE2, and UE5;

UE PDCCH resource allocation for ^Uhigh the UE (UE2, UE5), the need to limit PDCCH its maximum transmit power, and try to enhance the aggregation level, bit-rate reduction means to ensure reliability. If the highest aggregation level is still The PDCCH resource allocation requirement of the receiving end cannot be guaranteed. For these UEs, the current PDCCH resource allocation fails. Based on the same inventive concept, an embodiment of the present invention further provides a device for transmitting a PDCCH. The principle of the device is similar to the method for transmitting a PDCCH. Therefore, the implementation of the device may refer to the implementation of the method, and the repetition is no longer Narration.

 As shown in FIG. 2, the device for transmitting a PDCCH in the embodiment of the present invention includes: a resource set generation module 20 and an adjustment module 21.

 The resource set generating module 20 is configured to divide all subframes in the resource planning time period into multiple subframe sets according to the transmit power value of the normalized PDCCH, where the transmit power value of the PDCCH is expected when the PDCCH is sent to the user equipment. Transmit power value used;

 The adjusting module 21 is configured to determine, according to the comparison result of the transmit power value and the normalized power threshold of the strong interference PDCCH, a sending parameter that carries a PDCCH subframe in each subframe set, and send the sending parameter according to the corresponding sending parameter. PDCCH;

 The strong PDCCH is a PDCCH corresponding to the transmit power value being greater than the first threshold.

 Preferably, the device of the embodiment of the present invention may further include:

 The activation decision module 22 is configured to trigger the resource set generation module 20 to divide into a subframe set after determining that the sum of PDCCH resource utilizations of all user equipments in the cell is greater than a second threshold.

 Preferably, the activation decision module 22 determines the sum of the PDCCH resource utilization rates of the user equipments in the local cell according to the formula 1.

 Preferably, the resource set generation module 20 divides the subframe carrying the PDCCH in the time period [nT , (n+y)) into a plurality of subframe sets according to the transmit power value.

 Preferably, the resource set generation module 20 determines the number of subframes that need to carry the strong interference PDCCH in the resource planning time period; and divides the subframes in the resource planning time period into multiple subframe sets according to the determined number of subframes.

 Preferably, the resource set generation module 20 divides all the cells into multiple cell sets, where the number of subframe sets is not less than the multiplexing coefficient of the subframe capable of carrying the strong interference PDCCH, and any two of the same cell set. The cell is not adjacent to the physical location; determining a subframe set corresponding to each cell set, where each cell set corresponds to a different subframe set, and the number of subframes in the subframe set corresponding to each cell set is equal to the determining The number of subframes, the subframe in the corresponding subframe set of each cell set is a subframe in the corresponding cell that carries the strong interference PDCCH.

 Preferably, the device in the embodiment of the present invention may further include: a user equipment set dividing module 23.

The user equipment set dividing module 23 is configured to determine, according to the correspondence between the user set and the power range value, a user set corresponding to the power range value to which the transmit power value corresponding to each user equipment in the current resource planning resource belongs; The user equipment is divided into a determined set of users. Preferably, the resource set generation module 20 determines the strong interference according to the correspondence between the user set and the power range value.

a user set corresponding to the power range value to which the normalized power threshold of the PDCCH belongs; determining, according to the determined set of users, the number of subframes that the local cell needs to carry the strong interference PDCCH; determining the bearer according to the determined number of corresponding subframes The subframe of the strong PDCCH is divided into a subframe set, and the other subframes are divided into at least one subframe set.

 Preferably, the resource set generation module 20 determines the subframe of the PDCCH carrying the strong interference according to at least one of the following selection conditions:

 And selecting, from the subframe that carries the PDCCH, a subframe that is a PDCCH that does not carry a strong interference in the neighboring cell; and selecting, from the subframe that carries the PDCCH, a subframe in which the number of the neighboring cells is smaller than a threshold, where the neighboring region corresponding to the subframe The subframe is used as a neighboring area of a subframe carrying a strong PDCCH;

 A subframe that is a PDCCH carrying a strong interference is uniformly selected in the time domain.

 Preferably, the resource set generation module 20 determines, according to Equation 2, the number of subframes of the PDCCH that the cell needs to carry strong interference.

 Preferably, when determining the sending parameter, the adjusting module 21 carries the subframe of the strong PDCCH PDCCH in each subframe set for the corresponding user equipment whose transmit power value is less than the normalized power threshold. Up, the transmit power and the aggregation level are unchanged or the transmit power value is increased and the aggregation level is lowered, so that the adjusted transmit parameters ensure that the actual received signal-to-noise ratio of the user equipment is not lower than the third threshold; The user equipment whose transmit power value is not less than the normalized power threshold value, on the subframe of the PDCCH that does not carry the strong interference in each subframe set, uses the normalized power threshold as the transmit power. The maximum value, and the aggregation level is increased, so that the adjusted transmission parameters ensure that the actual received signal-to-noise ratio of the user equipment is not lower than the third threshold.

 Preferably, the adjusting module 21, when determining the sending parameter, carries the strong PDCCH sub-carrier in each subframe set for the corresponding user equipment whose transmit power value is not less than the normalized power threshold. a user equipment whose scheduling priority is higher than the corresponding transmit power value is less than the normalized power threshold, and the corresponding user equipment whose transmit power value is smaller than the normalized power threshold The transmit power value and the aggregation level remain unchanged, or increase the transmit power value and reduce the aggregation level, so that the adjusted transmit parameters ensure that the actual received signal-to-noise ratio of the user equipment is not lower than the third threshold; For the user equipment whose corresponding transmit power value is not less than the normalized power threshold, no scheduling is performed on the subframe of the PDCCH that does not carry the strong interference in each subframe set, or scheduling is performed but the scheduling is prioritized. The level is lower than the corresponding user equipment whose transmit power value is less than the normalized power threshold.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be applied to one or more computers in which computer usable program code is included. A form of computer program product embodied on a storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.).

 The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

 The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

 These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

 Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

 Since the interference between the cells is considered when determining the transmission parameter of the PDCCH subframe, the inter-cell interference in the downlink control region is reduced;

 Further, when performing the same-frequency networking, the coverage of the control channel can be improved, and the edge coverage area meets the missed detection probability of the PDCCH, thereby improving the uplink and downlink data transmission rate and user experience of the user equipment.

 It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request A method for transmitting a physical downlink control channel PDCCH, the method includes: dividing, according to a normalized PDCCH transmit power value, all subframes in a resource planning time period into a plurality of subframe sets, where The transmit power value of the PDCCH is a transmit power value that is expected to be used when the PDCCH is sent to the user equipment; and the bearer PDCCH is determined in each subframe set according to the comparison result of the transmit power value and the normalized power threshold of the strong interference PDCCH. Sending parameters of the subframe, and sending the PDCCH according to the corresponding sending parameter;  The strong PDCCH is a PDCCH corresponding to the transmit power value being greater than the first threshold.  The method according to claim 1, wherein before the dividing into the plurality of subframe sets, the method further comprises: determining that a sum of PDCCH resource utilizations of all user equipments in the cell is greater than a second threshold.  3. The method according to claim 2, wherein the user equipment in the cell is determined according to the following formula The sum of PDCCH resource utilization: PpDCCH usage ( ^W ) = β · PDCCH ^ ~ β) ' PpDCCH usage ( ^W - where - is the value obtained by smoothing the sum of PDCCH resource utilizations of all user equipments in the currently determined cell; η is the time period [(ny)T, nT) The sum of PDCCH resource utilizations of all user equipments in the current cell, n and y are positive integers, and y is not greater than n, where T is the period length of the PDCCH resource utilization rate of the user equipment;  Dividing into a plurality of subframe sets includes:  The subframe carrying the PDCCH in the time period [nT, (n+y)) is divided into a plurality of subframe sets according to the transmission power value.  4. The method according to claim 1, wherein dividing the plurality of subframe sets comprises:  Determining the number of subframes that need to carry a strong interference PDCCH during the resource planning period;  The subframe in the resource planning period is divided into a plurality of subframe sets according to the determined number of subframes.  5. The method according to claim 4, wherein before determining the sending parameter, the method further comprises:  Dividing all cells into a plurality of cell sets, wherein the number of subframe sets is not less than a multiplexing coefficient of a subframe capable of carrying a strong interference PDCCH, and any two cells in the same cell set are not adjacent in physical location;  Determining a subframe set corresponding to each cell set, where each cell set corresponds to a different subframe set, and the number of subframes in the subframe set corresponding to each cell set is equal to the determined number of subframes, and each cell set The subframe in the corresponding subframe set is a subframe in the corresponding cell that carries the strong interference PDCCH. 6. The method according to claim 1, wherein before dividing the plurality of subframe sets, the method further comprises: Determining, according to the corresponding relationship between the configured user set and the power range value, a set of users corresponding to the power range value to which the transmit power value corresponding to each user equipment in the current resource planning resource belongs;  The user equipment is divided into a determined set of users.  7. The method according to claim 6, wherein dividing into a plurality of subframe sets comprises:  Determining, according to a correspondence between the user set and the power range value, a set of users corresponding to a power range value to which the normalized power threshold of the strong interference PDCCH belongs;  Determining, according to the determined set of users, the number of subframes that the local cell needs to carry the strong interference PDCCH;  Determining a subframe carrying a strong interference PDCCH according to the determined number of corresponding subframes;  The subframe carrying the strong PDCCH is divided into one subframe set, and the other subframes are divided into at least one subframe set.  8. The method according to claim 7, wherein the subframe of the PDCCH carrying the strong interference is determined according to at least one of the following selection conditions:  Selecting, from the subframe carrying the PDCCH, a subframe that is a PDCCH that does not carry a strong interference in the neighboring cell;  And selecting, from the subframe that carries the PDCCH, a subframe in which the number of the neighboring cells is smaller than a threshold, where the neighboring region corresponding to the subframe is the neighboring region of the subframe that carries the strong PDCCH;  A subframe that is a PDCCH carrying a strong interference is uniformly selected in the time domain.  The method according to claim 7 or 8, wherein the number of subframes in which the cell needs to carry a strong PDCCH is determined according to the following formula: CCE _ high _ int erfei

/ λ 丄, CCE-PDCCH-Τ\ I丄,

Where is the number of subframes in which the cell needs to carry a strong interference PDCCH in the time period ^^ , ( _m +z)Tl); m and z are positive integers, and z is not greater than m; ^CC£- ZngA- mt er/ Is the PDCCH channel required by all user equipments in the local cell [(mz)Tl, mTl) where the interference strength of the neighboring cell is greater than the second threshold. The sum of the number of CCE resources; ^c^- ^{PZ)CC /} - ⁷¹ is the sum of the number of CCE resources available for the PDCCH channel in the time period [(mz)Tl , mTl); # PDCCH _τ\ is the time period [(mz)Tl , mTl The total number of downlink subframes that can be used for PDCCH transmission; T1 is the period length of the number of subframes in the cell where the user equipment needs to carry the PDCCH.  The method according to any one of claims 1 to 8, wherein the sending parameter comprises: a transmit power and/or an aggregation level, and determining a transmit parameter of each bearer PDCCH subframe comprises: And corresponding to the user equipment whose transmit power value is less than the normalized power threshold, in each subframe set In the subframe of the PDCCH carrying the strong interference, the transmit power and the aggregation level are unchanged or the transmit power value is increased and the aggregation level is lowered, so that the adjusted transmit parameters ensure that the actual received signal-to-noise ratio of the user equipment is not lower than a third threshold; for the user equipment whose corresponding transmit power value is not less than the normalized power threshold, on a subframe that does not carry a strong PDCCH in each subframe set, The normalized power threshold is used as the maximum value of the transmit power, and the aggregation level is increased, so that the adjusted transmit parameters ensure that the actual received signal-to-noise ratio of the user equipment is not lower than the third threshold.  The method according to any one of claims 1 to 8, wherein the sending parameter comprises: a transmit power and/or an aggregation level, and determining the sending parameters of each bearer PDCCH subframe comprises:  For the user equipment whose corresponding transmit power value is not less than the normalized power threshold, the scheduling priority is higher than the corresponding one of the subframes of the PDCCH carrying the strong interference in each subframe set. The user equipment whose power value is smaller than the normalized power threshold, and the corresponding transmit power value and aggregation level of the user equipment whose transmit power value is less than the normalized power threshold value remain unchanged. Or increasing the transmit power value and lowering the aggregation level, so that the adjusted transmit parameter ensures that the actual received signal to noise ratio of the user equipment is not lower than the third threshold;  For the user equipment whose corresponding transmit power value is not less than the normalized power threshold, no scheduling is performed on the subframe of the PDCCH that does not carry the strong interference in each subframe set, or scheduling is performed but the scheduling is prioritized. The level is lower than the corresponding user equipment whose transmit power value is less than the normalized power threshold.  12. A device for transmitting a PDCCH, the device comprising:  a resource set generating module, configured to divide all subframes in the resource planning time period into multiple subframe sets according to a transmit power value of the normalized PDCCH, where a transmit power value of the PDCCH is expected to be used when transmitting the PDCCH to the user equipment Transmit power value;  And an adjusting module, configured to determine, according to the comparison result of the transmit power value and the normalized power threshold of the strong PDCCH, determine a transmit parameter that carries a PDCCH subframe in each subframe set, and send a PDCCH according to the corresponding transmit parameter. ;  The strong PDCCH is a PDCCH corresponding to the transmit power value being greater than the first threshold.  The device of claim 12, wherein the device further comprises:  The activation decision module is configured to trigger the resource set generation module to divide into a subframe set after determining that a sum of PDCCH resource utilizations of all user equipments in the cell is greater than a second threshold. The device according to claim 13, wherein the activation decision module determines a sum of PDCCH resource utilization rates of user equipments in the local cell according to the following formula: PpDCCH usage ( ^W ) = β · PDCCH ^ ~ β) ' PpDCCH usage ( ^W - where - is the sum of PDCCH resource utilization of all user equipments in the current determined cell The value after smoothing is performed; η is the sum of PDCCH resource utilization rates of all user equipments in the current cell in the period [(ny)T, nT), n and y are positive integers and y is not greater than n, and T is a statistical user. The period length of the PDCCH resource utilization of the device;  The resource collection generation module is specifically configured to:  The subframe carrying the PDCCH in the time period [nT, (n+y)) is divided into a plurality of subframe sets according to the transmission power value.  The device according to claim 12, wherein the resource set generating module is specifically configured to: determine a number of subframes that need to carry a strong interference PDCCH in a resource planning time period; according to the determined number of subframes, The subframe within the resource planning period is divided into a plurality of subframe sets.  The device according to claim 15, wherein the resource set generating module is further configured to: divide all cells into multiple cell sets, where the number of subframe sets is not less than that capable of carrying a strong interference PDCCH. a multiplexing coefficient of a subframe, where two cells in the same cell set are not adjacent in physical location; determining a subframe set corresponding to each cell set, where each cell set corresponds to a different subframe set, and each The number of subframes in the subframe set corresponding to the cell set is equal to the determined number of subframes, and the subframes in the subframe set corresponding to each cell set are subframes in the corresponding cell that carry the strong interference PDCCH.  The device of claim 12, wherein the device further comprises:  a user equipment set partitioning module, configured to determine, according to a correspondence between a user set and a power range value, a user set corresponding to a power range value to which the transmit power value corresponding to each user equipment in the current resource planning resource belongs; The user equipment is divided into a determined set of users.  The device according to claim 17, wherein the resource set generating module is specifically configured to: determine a normalized power threshold of the strong interference PDCCH according to the corresponding relationship between the configured user set and the power range value a user set corresponding to the power range value to which the value belongs; determining, according to the determined set of users, the number of subframes that the local cell needs to carry the strong interference PDCCH; determining the subframe carrying the strong interference PDCCH according to the determined number of corresponding subframes; The subframe carrying the strong PDCCH is divided into one subframe set, and the other subframes are divided into at least one subframe set.  The device according to claim 18, wherein the resource set generation module determines a subframe of a PDCCH carrying a strong interference according to at least one of the following selection conditions:  Selecting, from the subframe carrying the PDCCH, a subframe that is a PDCCH that does not carry a strong interference in the neighboring cell;  And selecting, from the subframe that carries the PDCCH, a subframe in which the number of the neighboring cells is smaller than a threshold, where the neighboring region corresponding to the subframe is the neighboring region of the subframe that carries the strong PDCCH;  A subframe that is a PDCCH carrying a strong interference is uniformly selected in the time domain. The device according to claim 18 or 19, wherein the resource set generation module is according to the following The formula determines the number of subframes of the PDCCH that the cell needs to carry strong interference:

Wherein, implicit _e is the number of subframes in the time segment ^^, ( _m + z)Tl) that the host needs to carry the strong interference PDCCH; m and z are positive integers, and z is not greater than m; ^CCE _high _mt erfer is time The PDCCH channel required by the user equipment in the cell [(mz)Tl, mTl) where the interference strength of the neighboring cell is greater than the second threshold The sum of the number of CCE resources; ^c^- ^{PZ)CC /} - ⁷¹ is the sum of the number of CCE resources available for the PDCCH channel in the time period [(mz)Tl , mTl); # PDCCH _τ\ is the time period [(mz)Tl , mTl The total number of downlink subframes that can be used for PDCCH transmission; T1 is the period length of the number of subframes in the cell where the user equipment needs to carry the PDCCH.  The device according to any one of claims 12 to 19, wherein the transmission parameter comprises: a transmission power and/or an aggregation level, and the adjustment module is specifically configured to:  For the user equipment whose corresponding transmit power value is less than the normalized power threshold, the transmit power and the aggregation level are unchanged or improved on the subframe of the PDCCH carrying the strong interference in each subframe set. Transmitting the power value and decreasing the aggregation level, so that the adjusted transmission parameter ensures that the actual received signal-to-noise ratio of the user equipment is not lower than the third threshold; and the corresponding transmit power value is not less than the normalized power gate. The user equipment of the limit, on the subframe of the PDCCH that does not carry the strong interference in each subframe set, uses the normalized power threshold as the maximum value of the transmission power, and increases the aggregation level, so that the adjusted The sending parameter ensures that the actual received signal to noise ratio of the user equipment is not lower than the third threshold.  The device according to any one of claims 12 to 19, wherein the transmission parameter comprises: a transmission power and/or an aggregation level, and the adjustment module is specifically configured to:  For the user equipment whose corresponding transmit power value is not less than the normalized power threshold, the scheduling priority is higher than the corresponding one of the subframes of the PDCCH carrying the strong interference in each subframe set. The user equipment whose power value is smaller than the normalized power threshold, and the corresponding transmit power value and aggregation level of the user equipment whose transmit power value is less than the normalized power threshold value remain unchanged. Or increasing the transmit power value and decreasing the aggregation level, so that the adjusted transmit parameter ensures that the actual received signal-to-noise ratio of the user equipment is not lower than a third threshold; and the corresponding transmit power value is not less than the return The user equipment of the power threshold is not scheduled on a subframe of the PDCCH that does not carry the strong interference in each subframe set, or is scheduled, but the scheduling priority is lower than the corresponding transmit power value is less than the User equipment that normalizes the power threshold.