CN102378263B - Method and system for equalizing distribution of physical downlink control channels - Google Patents
Method and system for equalizing distribution of physical downlink control channels Download PDFInfo
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Abstract
The invention discloses a method and a system for equalizing the distribution of physical downlink control channels. The method includes the following steps: a base station sequentially chooses idle C-RNTIs (cell radio network temporary identifier), and respectively calculates a search space corresponding to each C-RNTI, and if the resource utilization rate of a CCE (control channel element) occupied by one of the search spaces is less than a designated value, the C-RNTI is put into a to-add list; one or more C-RNTIs are chosen from the to-add list and sent to a terminal; after storage, the terminal sends an acknowledgement message to the base station; after receiving the acknowledgement message, the base station locally updates the search spaces corresponding to the terminal, and PDCCH (physical downlink control channel) data corresponding to the terminal are sent on all the search spaces corresponding to the terminal; and the terminal searches the corresponding PDCCH data on the corresponding search spaces. The technical scheme provided by the invention can equalize the distribution of PDCCHs on system resources and reduce the occurrence of PDCCH resource collision.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method and a system for balancing physical downlink control channel distribution.
Background
The downlink direction of LTE adopts Orthogonal Frequency Division Multiplexing (OFDM), wherein 1 radio frame of LTE includes 10 subframes (subframes) and 20 slots (slots), each downlink slot is divided into a plurality of OFDM symbols, and the number of included OFDM symbols is different according to the length of CP. When the normal CP is used, one downlink slot contains 7 OFDM symbols; when the extended CP is used, one downlink slot contains 6 OFDM symbols. In this time-frequency Resource block, one Resource Element (RE) is a Resource defined by one symbol and one subcarrier, and one Resource Block (RB) is a time-frequency Resource occupied by 12 subcarriers and one downlink slot. The frame structure and the resource block definitions included in LTE may vary differently according to different scenarios and configurations.
The LTE system usually maps different physical channels to corresponding resources in each subframe, a cell reference signal CRS is placed first in the resource mapping, then a physical format indicator channel PCFICH is placed, the terminal system can obtain the number of time domain symbols occupied by a control region in the subframe through decoding the PCFICH, generally, the base station system will configure 1-3 symbols as the control region, and the remaining symbols of the subframe will be used as a data carrying region for carrying a physical downlink shared channel PDSCH. And the base station continuously places a physical HARQ indicator channel PHICH in the control region, and after the resource mapping is completed, the rest unused resources in the control region are extracted and numbered again to be used as candidate resources of a physical downlink control channel PDCCH.
In the LTE system, in order to configure PDCCH and other downlink Control channels effectively, two dedicated Control Channel resource units, resource Element groups (REGs, RE groups) and Control Channel Elements (CCEs) are defined; wherein, one REG consists of four adjacent 4 subcarriers in the frequency domain, one CCE consists of several REGs, one PDCCH consists of several CCEs, there are several different PDCCH format choices, and the parameters of PDCCH formats 0-3 are listed in table 1.
| PDCCH format | Number of CCEs involved | Number of included REGs | Included PDCCH bits |
| 0 | 1 | 9 | 72 |
| 1 | 2 | 18 | 144 |
| 2 | 4 | 36 | 288 |
| 3 | 8 | 72 | 576 |
TABLE 1
In the LTE system, in order to adapt to different transmission environments and requirements, a plurality of DCI formats are designed to configure a suitable transmission scheme for a corresponding UE, and transmission parameters selected for the UE, such as resource allocation, modulation/coding scheme selection, and the like of the UE, are explicitly or implicitly included in DCI information. Under different transmission modes and bandwidths, the DCI has different bit numbers, the LTE system selects a PDCCH format which can meet the transmission quality according to the number and the corresponding channel condition of the UE, performs channel coding on corresponding DCI information to generate coded data corresponding to the selected format, and one piece of DCI information corresponds to one piece of PDCCH data. The mapping of PDCCH data to physical resources specifically includes: firstly, the residual RE resources of the control area are extracted and combined into N in sequenceCCEA number of CCEs; secondly, a search space is defined on the search space, the search space is the CCE position of the PDCCH of the terminal, a plurality of PDCCH candidates can be corresponding to one search space, wherein, the CCE corresponding to the mth PDCCH on the search space is
Where i is 0, … L-1, L is the number of CCEs corresponding to the selected PDCCH format, i.e. aggregation level, Yk＝(A·Yk-1)mod D，Y-1＝nRNTI≠0，A＝39827，D＝65537，nsIs a slot number within a 10ms radio frame. The RNTI is used for distinguishing information carried on the PDCCH, each terminal is allocated with a unique C-RNTI in the access process, when the terminal detects an RNTI value matched with the terminal, the terminal knows that the information belongs to the terminal, and the mapping positions are different when the two types of information are mapped. If it is common signaling, then mapping to a common search space by taking Yk0; if the signaling is the signaling of the terminal, mapping the signaling to the search space of each terminal according to the original formula. Wherein the C-RNTI values range from 0001-003C, and 003D-FFF 3.
When detecting the PDCCH information, the terminal needs to try all possible PDCCH positions and DCI bearer information, and when the decoded data meets its own CRC check rule, it considers that the correct configuration information is obtained. The search space of each terminal includes a dedicated search space and a common search space, wherein there may be an overlap between the dedicated search space and the common search space, and thus there may be a possibility of PDCCH resource collision, fig. 1 is a schematic diagram of resource collision between the search spaces of each terminal, as shown in fig. 1, where terminal 1 is a search space with a degree of aggregation of 4, terminal 2 is a search space with a degree of aggregation of 8, and terminal 3 is a search space with a degree of aggregation of 1. In this case, regardless of the selection of the terminal 2, collision occurs with the terminal 1 or the terminal 3.
The base station avoids the mutual collision between the resources of the terminals as much as possible through scheduling. However, as the number of UEs increases, the MIMO technology supporting high-capacity transmission and the deployment of heterogeneous networks, the downlink control information to be transmitted increases increasingly, and thus the problem of the capacity limitation of the PDCCH becomes increasingly obvious. In the prior art, pseudo-random positions calculated based on the RNTI should be subject to average distribution in the statistical average sense, but in practical situations, there may be a problem that the utilization degree of the uncontrolled area is unbalanced, that is, for a certain group of determined terminals, the terminal search space calculated via the RNTI is distributed in a certain part of the controlled area more intensively, so that the collision probability is higher, and meanwhile, an idle area with a lower utilization degree exists in the controlled area, so that the overall performance of the system is not exerted to the utmost. Fig. 2 is a diagram illustrating PDCCH resource distribution in the prior art, and as shown in fig. 2, the PDCCHs of terminal 5 and terminal 6 cannot be transmitted due to insufficient resources, while there are available idle resources elsewhere.
As described above, in the prior art, as the number of downlink control information to be transmitted increases and the PDCCH is unevenly distributed on the system resources, PDCCH resource collision is likely to occur in each terminal.
Disclosure of Invention
The invention provides a method for balancing physical downlink control channel distribution, which can balance the distribution of PDCCH on system resources and reduce the probability of PDCCH resource collision.
The invention also provides a system for balancing the distribution of the physical downlink control channel, which can balance the distribution of the PDCCH on system resources and reduce the probability of PDCCH resource collision.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention discloses a method for balancing physical downlink control channel distribution, which comprises the following steps:
the base station sequentially selects idle C-RNTIs, respectively calculates search spaces corresponding to each C-RNTI, if the resource utilization rate of a CCE occupied by a certain search space is smaller than a specified value, the C-RNTI is put into a list to be increased, and one or more C-RNTIs are selected from the list to be increased and sent to the terminal;
after receiving and storing the C-RNTI sent by the base station, the terminal sends a confirmation message to the base station;
a base station receives a confirmation message sent by a terminal, locally updates a search space corresponding to the terminal, and selects a PDCCH channel on all the search spaces corresponding to the terminal to send PDCCH data corresponding to the terminal;
and the terminal searches corresponding PDCCH data in the search space corresponding to the plurality of stored C-RNTIs.
In the method, a base station respectively calculates the search space corresponding to each C-RNTI according to the allocated C-RNTI, and if the resource utilization rate of a CCE occupied by a certain search space is greater than a specified value, the C-RNTI is put into a list to be deleted;
selecting one C-RNTI from the list to be deleted, sending a message for deleting the C-RNTI to a terminal corresponding to the C-RNTI, and stopping sending PDCCH data on a search space corresponding to the C-RNTI;
the terminal deletes the C-RNTI after receiving the message, stops searching the search space corresponding to the C-RNTI and sends a confirmation message to the base station;
a base station receives a confirmation message sent by a terminal, locally updates a search space corresponding to the terminal, and selects a PDCCH channel on all the search spaces corresponding to the terminal to send PDCCH data corresponding to the terminal;
and the terminal searches corresponding PDCCH data on the search space corresponding to the one or more stored C-RNTIs.
In the above method, if the resource utilization rate of the CCE occupied by a certain search space is greater than a specified value, placing the C-RNTI corresponding to the search space in the to-be-deleted list includes:
the specified value is the average value of the resource utilization rates of all CCEs;
and if the resource utilization rate of one or more CCEs occupied by a certain search space is greater than the average value, putting the C-RNTI corresponding to the search space into a list to be deleted.
In the above method, the selecting one C-RNTI from the list to be deleted includes:
and the terminal corresponding to the selected C-RNTI is provided with a plurality of C-RNTIs.
In the above method, the sending the PDCCH corresponding to the terminal in all search spaces corresponding to the terminal includes:
and the base station calculates search spaces corresponding to the one or more C-RNTIs according to the one or more C-RNTIs owned by the terminal, searches idle resources in the one or more search spaces and sends PDCCH information to the corresponding terminal.
The invention also discloses a system for balancing the distribution of the physical downlink control channel, which comprises: a base station and a terminal; wherein,
the base station sequentially selects the idle C-RNTIs, respectively calculates the search space corresponding to each C-RNTI, puts the C-RNTI in a list to be increased if the resource utilization rate of CCE occupied by a certain search space is less than a specified value, and selects one or more C-RNTIs from the list to be increased to send the one or more C-RNTIs to the terminal; the PDCCH data transmission method comprises the steps that a confirmation message sent by a terminal is received, a search space corresponding to the terminal is updated locally, and PDCCH channels are selected on all the search spaces corresponding to the terminal to transmit PDCCH data corresponding to the terminal;
the terminal is used for receiving and storing the C-RNTI sent by the base station and then sending a confirmation message to the base station; and the method is used for searching corresponding PDCCH data in the search space corresponding to the plurality of stored C-RNTIs.
The base station is used for respectively calculating the search space corresponding to each C-RNTI according to the allocated C-RNTIs, and if the resource utilization rate of the CCE occupied by a certain search space is greater than a specified value, the C-RNTI is put into a list to be deleted; the system is used for selecting one C-RNTI from the list to be deleted, sending a message for deleting the C-RNTI to a terminal corresponding to the C-RNTI and stopping sending PDCCH data on a search space corresponding to the C-RNTI; the PDCCH data transmission method comprises the steps that a confirmation message sent by a terminal is received, a search space corresponding to the terminal is updated locally, and PDCCH channels are selected on all the search spaces corresponding to the terminal to transmit PDCCH data corresponding to the terminal;
the terminal is used for deleting the C-RNTI after receiving the message, stopping searching the search space corresponding to the C-RNTI and sending a confirmation message to the base station; and the terminal searches corresponding PDCCH data on the search space corresponding to the one or more stored C-RNTIs.
In the system, the base station is used for selecting one or more search spaces with the resource utilization rate of CCE (control channel element) larger than a specified value, and placing C-RNTIs corresponding to the search spaces into a list to be deleted; wherein the specified value is an average of resource utilization of all CCEs;
in the system, the base station is configured to select one C-RNTI from the list to be deleted, where a terminal corresponding to the selected C-RNTI has multiple C-RNTIs.
In the system, the base station is configured to calculate a search space corresponding to one or more C-RNTIs according to the one or more C-RNTIs owned by the terminal, and search for an idle resource in the one or more search spaces to send PDCCH data to the corresponding terminal.
In the technical scheme provided by the invention, the search space of the terminal is increased by distributing a plurality of C-RNTIs to the terminal, the distribution of PDCCH in system resources is balanced, and the collision probability of PDCCH resources of each terminal is reduced. The technical scheme of the invention can improve the resource utilization rate of the system.
Drawings
FIG. 1 is a schematic diagram of resource collisions between terminal search spaces;
FIG. 2 is a diagram illustrating PDCCH resource distribution in the prior art;
FIG. 3 is a flow chart of a method of balancing PDCCH distribution in the present invention;
figure 4 is a flow chart of adding C-RNTI in one embodiment of the invention;
figure 5 is a signaling flow diagram for sending a C-RNTI addition message in one embodiment;
figure 6 is a flow diagram of deleting a C-RNTI in one embodiment of the invention;
figure 7 is a signaling flow diagram for sending a C-RNTI delete message in one embodiment;
FIG. 8 is a diagram illustrating the effect of PDCCH distribution after using the present invention;
fig. 9 is a schematic diagram of a system structure for balancing PDCCH distribution according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
FIG. 3 is a flow chart of a method of balancing PDCCH distribution in the present invention; as described in relation to figure 3 of the drawings,
301, a base station selects idle C-RNTIs in sequence, respectively calculates search spaces corresponding to each C-RNTI, if the resource utilization rate of a CCE occupied by a certain search space is less than a specified value, puts the C-RNTI in a list to be increased, and selects one or more C-RNTIs from the list to be increased to send the C-RNTIs to a terminal;
and step 304, the terminal searches corresponding PDCCH data on the search spaces corresponding to the plurality of stored C-RNTIs.
Figure 4 is a flow chart of adding C-RNTI in one embodiment of the invention; as shown in figure 4 of the drawings,
in step 401, the base station finds one or more idle C-RNTIs.
In step 401, the base station respectively calculates a search space corresponding to each C-RNTI by sequentially selecting idle C-RNTIs; and comparing the resource utilization rates of the CCEs corresponding to the search spaces obtained by calculation, if the resource utilization rate of the CCE occupied by a certain search space is smaller than a specified value, wherein the specified value is the average value of the resource utilization rates of all the CCEs, putting the C-RNTIs into a list to be increased, and selecting one or more C-RNTIs from the list to be increased to send the C-RNTIs to the terminal. In other embodiments of the present invention, comparing the CCE corresponding to each search space obtained by the calculation, and if the probability of PDCCH resource collision on the CCE is low, sending the C-RNTI corresponding to the search space to the terminal; the probability of PDCCH resource collision can be compared by the coincidence degree of the search spaces of the terminals, and if CCE1 is in the search space corresponding to 3 terminals and CCE2 is in the search space corresponding to 5 terminals, the probability of PDCCH resource collision of CCE1 can be considered to be higher than the probability of PDCCH resource collision of CCE 2.
In step 402, the base station sends a C-RNTI increasing message to the target terminal through a high-level signaling specifically as follows: a terminal sends an RRC connection reconfiguration signaling to a base station, wherein the RRC connection reconfiguration signaling carries a C-RNTI increasing message which comprises one or more corresponding C-RNTIs; and the C-RNTI reconfiguration message carried in the RRC connection reconfiguration signaling also comprises one or more corresponding C-RNTIs.
In other embodiments of the present invention, the probability of PDCCH resource collision occurring on the search space corresponding to the C-RNTI of the found target terminal is higher than the average value, and the average value is defined in the same step 401.
In step 402 shown in fig. 4, the base station transmits the corresponding one or more C-RNTIs to the terminal through higher layer signaling. Fig. 5 shows a specific procedure, where fig. 5 is a signaling flowchart for sending a C-RNTI addition message in an embodiment; as shown in figure 5 of the drawings,
step 501, a base station sends a C-RNTI increasing message to a terminal, wherein the message carries one or more corresponding C-RNTIs.
Step 502, the terminal sends a C-RNTI increase confirmation message to the base station.
The base station finds out one or more C-RNTIs with low probability of PDCCH resource collision in a corresponding search space through calculation, and sends the C-RNTIs to the terminal through a high-level signaling; the base station can search for appropriate resources in all search spaces corresponding to a plurality of C-RNTIs corresponding to the terminal to send corresponding PDCCH data, and the terminal searches for corresponding PDCCH resources in all search spaces corresponding to the plurality of C-RNTIs.
The method and the device have the advantages that the C-RNTI is added to the terminal without limitation, so that the retrieval load of the terminal is increased, if one terminal carries a plurality of C-RNTIs, the burden of the terminal for analyzing PDCCH information is too heavy, and in the method and the device, when the resource utilization rate of CCE on a search space corresponding to a certain C-RNTI in one terminal is higher, the C-RNTI is deleted, so that the system performance is improved, and the decoding burden of the terminal is reduced. Figure 6 is a flow diagram of deleting a C-RNTI in one embodiment of the invention;
In step 601, the base station respectively calculates the search space corresponding to each C-RNTI according to the allocated C-RNTI, finds out a search space with a CCE resource utilization rate greater than a specified value by comparing the resource utilization rates of CCEs in the search spaces, and puts the C-RNTI corresponding to the search space into a list to be deleted, wherein the specified value is the average value of the resource utilization rates of all CCEs. In other embodiments of the invention, the probability of PDCCH resource collision of CCE on the search space corresponding to the C-RNTI found by the base station is higher. The specific numerical value is set according to the actual deployment situation.
And the list to be deleted comprises one or more C-RNTIs, the base station selects one C-RNTI, and the terminal corresponding to the selected C-RNTI is the target terminal. And the terminal corresponding to the selected C-RNTI comprises a plurality of C-RNTIs. Since when the terminal has only one C-RNTI, deleting the C-RNTI may cause the terminal to need to re-access the base station, which may affect the user experience. In other embodiments of the present invention, if a plurality of C-RNTIs corresponding to a terminal are all in the list to be deleted, a plurality of C-RNTIs may be selected and any one of them may be reserved; or the deletion operation can be performed by adding a free C-RNTI first.
In step 602, the sending, by the base station through the high-level signaling, the message to delete the C-RNTI to the target terminal specifically includes: a terminal sends an RRC connection reconfiguration signaling to a base station, wherein the RRC connection reconfiguration signaling carries a C-RNTI deletion message, and the C-RNTI deletion message comprises corresponding C-RNTI information; and C-RNTI reconfiguration information carried in the RRC connection reconfiguration signaling also comprises the C-RNTI information.
In other embodiments of the present invention, the probability of PDCCH resource collision occurring on the search space corresponding to the C-RNTI of the found target terminal is higher than the average value, and the average value is defined in the same step 601.
In step 602 shown in fig. 6, the base station sends a C-RNTI deletion message to the target terminal through a high-layer signaling to delete the corresponding C-RNTI, the specific process is shown in fig. 7, and fig. 7 is a signaling flowchart of sending the C-RNTI deletion message in an embodiment; as shown in figure 7 of the drawings,
step 701, the base station sends a C-RNTI deletion message to the terminal, and the message carries the corresponding C-RNTI.
Step 702, the terminal sends a C-RNTI deletion confirmation message to the base station.
In the signaling flow shown in fig. 5 or fig. 7, the specific data transmission of the C-RNTI is: and encapsulating the related signaling layer by layer from a high layer to a physical layer, and finally mapping the related signaling to a PDSCH data bearing channel indicated by the PDCCH channel.
FIG. 8 is a diagram illustrating the effect of PDCCH distribution after using the present invention; as shown in fig. 8, since the search spaces corresponding to the C-RNTI of the terminal 5 and the C-RNTI of the terminal 6 are not enough to transmit PDCCH data, under normal circumstances, the terminal 5 and the terminal 6 need to wait for the PDCCH data transmission of the terminal 3 and the terminal 4 before using corresponding system resources. According to the technical scheme, the base station finds out the C-RNTI corresponding to the idle search space by calculating each idle C-RNTI and sends the C-RNTI to the terminal 5, and the base station can send PDCCH resources of the terminal 5 on the search space corresponding to the newly allocated C-RNTI; and then, finding a C-RNTI corresponding to the idle search space by calculating each idle C-RNTI, and sending the C-RNTI to the terminal 6, wherein the base station can send the PDCCH resources of the terminal 6 on the search space corresponding to the newly allocated C-RNTI.
In practical application, as one terminal has at least one C-RNTI, the base station does not send a C-RNTI deletion message to a terminal with only one C-RNTI. In the schematic diagram shown in fig. 8, in an actual use situation of the present invention, the base station first allocates a new C-RNTI to the terminal 5 and the terminal 6, and then deletes the original C-RNTI, so as to achieve the purpose of artificially allocating the search space, thereby fully utilizing the system resources.
The present invention also provides a system using the present invention, and fig. 9 is a schematic structural diagram of a system for balancing PDCCH distribution according to the present invention; as shown in fig. 9, the system includes: a base station 901 and a terminal 902;
a base station 901, configured to sequentially select idle C-RNTIs, respectively calculate search spaces corresponding to each C-RNTI, put a certain search space occupied by the C-RNTI in a to-be-added list if the resource utilization rate of the CCE is less than a specified value, and select one or more C-RNTIs from the to-be-added list to send to a terminal 902; the PDCCH receiving module is configured to receive a confirmation message sent by the terminal 902, locally update a search space corresponding to the terminal 902, and select a PDCCH channel on all search spaces corresponding to the terminal 902 to send PDCCH data corresponding to the terminal 902;
the terminal 902 is configured to send a confirmation message to the base station 901 after receiving and storing the C-RNTI sent by the base station 901; and the method is used for searching corresponding PDCCH data in the search space corresponding to the plurality of stored C-RNTIs.
In the above system, the system further comprises: a base station 901, configured to calculate, according to the allocated C-RNTIs, search spaces corresponding to each C-RNTI, respectively, and if a resource utilization rate of a CCE occupied by a certain search space is greater than a specified value, place the C-RNTI in a list to be deleted; the system is used for selecting one C-RNTI from the list to be deleted, sending a message for deleting the C-RNTI to a terminal 902 corresponding to the C-RNTI, and stopping sending PDCCH data on a search space corresponding to the C-RNTI; the ue is configured to receive a confirmation message sent by the terminal 902, locally update the search space corresponding to the terminal 902, and select a PDCCH channel on all the search spaces corresponding to the terminal 902 to send PDCCH data corresponding to the terminal 902.
The terminal 902 is configured to delete the C-RNTI after receiving the message, stop searching for a search space corresponding to the C-RNTI, and send a confirmation message to the base station 901; the terminal 902 searches for corresponding PDCCH data in the search space corresponding to the stored one or more C-RNTIs.
In the system, the base station 901 is configured to select one or more search spaces in which the resource utilization rate of the occupied CCE is greater than a specified value, and place the C-RNTI corresponding to each search space in a list to be deleted; wherein the specified value is an average of resource utilization of all CCEs;
in the system, the base station 901 is configured to select one C-RNTI from the list to be deleted, where a terminal 902 corresponding to the selected C-RNTI has multiple C-RNTIs.
In the above system, the base station 901 is configured to calculate, according to one or more C-RNTIs owned by the terminal 902, search spaces corresponding to the one or more C-RNTIs, and search for idle resources in the one or more search spaces to send PDCCH data to the corresponding terminal 902.
In summary, in the invention, the purpose of balancing the distribution of the PDCCH is achieved by allocating a plurality of C-RNTIs to the terminal with high PDCCH resource collision probability and reducing the C-RNTIs with high resource utilization rate of the corresponding search space by the terminal with high PDCCH resource collision probability, so that more PDCCHs are transmitted by using the same system resource. The technical scheme of the invention does not need to modify the whole transmission mechanism of the transmission and technology too much, thereby improving the efficiency and enhancing the user experience.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for balancing physical downlink control channel distribution, the method comprising:
the base station sequentially selects idle C-RNTIs, respectively calculates search spaces corresponding to each C-RNTI, if the resource utilization rate of a CCE occupied by a certain search space is smaller than a specified value, the C-RNTI is put into a list to be increased, and one or more C-RNTIs are selected from the list to be increased and sent to the terminal;
after receiving and storing the C-RNTI sent by the base station, the terminal sends a confirmation message to the base station;
a base station receives a confirmation message sent by a terminal, locally updates a search space corresponding to the terminal, and selects a PDCCH channel on all the search spaces corresponding to the terminal to send PDCCH data corresponding to the terminal;
and the terminal searches corresponding PDCCH data in the search space corresponding to the plurality of stored C-RNTIs.
2. The method of claim 1, further comprising,
the base station respectively calculates the search space corresponding to each C-RNTI according to the allocated C-RNTIs, and if the resource utilization rate of the CCE occupied by a certain search space is greater than a specified value, the C-RNTI is put into a list to be deleted;
selecting one C-RNTI from the list to be deleted, sending a message for deleting the C-RNTI to a terminal corresponding to the C-RNTI, and stopping sending PDCCH data on a search space corresponding to the C-RNTI;
the terminal deletes the C-RNTI after receiving the message, stops searching the search space corresponding to the C-RNTI and sends a confirmation message to the base station;
a base station receives a confirmation message sent by a terminal, locally updates a search space corresponding to the terminal, and selects a PDCCH channel on all the search spaces corresponding to the terminal to send PDCCH data corresponding to the terminal;
the terminal searches corresponding PDCCH data on the search space corresponding to one or more stored C-RNTIs;
wherein,
and when the terminal only has one C-RNTI, adding an idle C-RNTI for the terminal.
3. The method according to claim 2, wherein if the resource utilization of the CCE occupied by a certain search space is greater than a specified value, placing the C-RNTI corresponding to the search space in the to-be-deleted list comprises:
the specified value is the average value of the resource utilization rates of all CCEs;
and if the resource utilization rate of one or more CCEs occupied by a certain search space is greater than the average value, putting the C-RNTI corresponding to the search space into a list to be deleted.
4. The method of claim 2, wherein the selecting one C-RNTI from the list to be deleted comprises:
and the terminal corresponding to the selected C-RNTI is provided with a plurality of C-RNTIs.
5. The method of claim 2, wherein the sending the PDCCH corresponding to the terminal on all search spaces corresponding to the terminal comprises:
and the base station calculates search spaces corresponding to the one or more C-RNTIs according to the one or more C-RNTIs owned by the terminal, searches idle resources in the one or more search spaces and sends PDCCH information to the corresponding terminal.
6. A system for balancing physical downlink control channel distribution, the system comprising: a base station and a terminal; wherein,
the base station sequentially selects the idle C-RNTIs, respectively calculates the search space corresponding to each C-RNTI, puts the C-RNTI in a list to be increased if the resource utilization rate of CCE occupied by a certain search space is less than a specified value, and selects one or more C-RNTIs from the list to be increased to send the one or more C-RNTIs to the terminal; the PDCCH data transmission method comprises the steps that a confirmation message sent by a terminal is received, a search space corresponding to the terminal is updated locally, and PDCCH channels are selected on all the search spaces corresponding to the terminal to transmit PDCCH data corresponding to the terminal;
the terminal is used for receiving and storing the C-RNTI sent by the base station and then sending a confirmation message to the base station; and the method is used for searching corresponding PDCCH data in the search space corresponding to the plurality of stored C-RNTIs.
7. The system of claim 6, further comprising:
the base station is used for respectively calculating the search space corresponding to each C-RNTI according to the allocated C-RNTIs, and if the resource utilization rate of the CCE occupied by a certain search space is greater than a specified value, the C-RNTI is put into a list to be deleted; the system is used for selecting one C-RNTI from the list to be deleted, sending a message for deleting the C-RNTI to a terminal corresponding to the C-RNTI and stopping sending PDCCH data on a search space corresponding to the C-RNTI; the PDCCH data transmission method comprises the steps that a confirmation message sent by a terminal is received, a search space corresponding to the terminal is updated locally, and PDCCH channels are selected on all the search spaces corresponding to the terminal to transmit PDCCH data corresponding to the terminal; the terminal is used for adding an idle C-RNTI for the terminal when the terminal only has one C-RNTI;
the terminal is used for deleting the C-RNTI after receiving the message, stopping searching the search space corresponding to the C-RNTI and sending a confirmation message to the base station; and the terminal searches corresponding PDCCH data on the search space corresponding to the one or more stored C-RNTIs.
8. The system of claim 7,
the base station is used for selecting one or more search spaces with the resource utilization rate of CCE (control channel element) larger than a specified value, and putting the C-RNTI corresponding to each search space into a list to be deleted; wherein the specified value is an average of resource utilization of all CCEs.
9. The system of claim 8,
and the base station is used for selecting one C-RNTI from the list to be deleted, wherein the terminal corresponding to the selected C-RNTI is provided with a plurality of C-RNTIs.
10. The system of claim 8,
and the base station is used for calculating the search spaces corresponding to the one or more C-RNTIs according to the one or more C-RNTIs owned by the terminal, searching for idle resources in the one or more search spaces and sending the PDCCH data to the corresponding terminal.
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| CN102711269A (en) * | 2012-06-19 | 2012-10-03 | 张家港市鸿嘉数字科技有限公司 | Device for transmitting physical downlink control channel (PDCCH) |
| CN102905383A (en) * | 2012-10-22 | 2013-01-30 | 张家港市鸿嘉数字科技有限公司 | Transmitting device for PDCCH (physical downlink control channel) |
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