CN107846702B - Resource allocation method for enhanced physical downlink control channel - Google Patents
Resource allocation method for enhanced physical downlink control channel Download PDFInfo
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Abstract
The application discloses a resource allocation method for enhancing a physical downlink control channel, which comprises the following steps: in each preset resource adjustment period, counting an Enhanced Control Channel Element (ECCE) utilization rate of an Enhanced Physical Downlink Control Channel (EPDCCH) of a cell and a cell downlink load in the period; and according to the ECCE utilization rate of the EPDCCH and the cell downlink load counted in the current period, according to the principle of maximally allocating EPDCCH resources to the user while meeting the cell downlink load requirement, User Equipment (UE) configured to use the EPDCCH for the cell is adjusted for the EPDCCH resources. By adopting the method and the device, the waste of EPDCCH resources can be effectively avoided.
Description
Technical Field
The present invention relates to a mobile communication technology, and in particular, to a resource allocation method for Enhanced Physical Downlink Control Channel (EPDCCH).
Background
In Rel-10 and previous releases, all downlink L1/L2 control information (PCFICH/PHICH/PDCCH) is transmitted on the control region (consisting of the first few OFDM symbols of one downlink subframe).
In Rel-11, the concept of EPDCCH is introduced, which uses PDSCH resources to transmit DCI, typically occupying only a small portion of the entire downlink system bandwidth. The use of EPDCCH is triggered in case the PDCCH capacity is limited. In order to avoid double overhead with PDCCH, the blind search space of EPDCCH only supports the user-specific search space, the user-specific search space of EPDCCH is in the EPDCCH channel, and the common search space is in the PDCCH channel.
A cell may configure 1 or 2 physical resource block pair (PRB pair) sets (i.e., EPDCCH-PRB-pair sets, hereinafter referred to as "EPDCCH sets") for each user using EPDCCH. EPDCCH can only be transmitted on these EPDCCH sets. An EPDCCH set is a concept at the user level, and the same EPDCCH set can be multiplexed by multiple users. The 1 EPDCCH set consists of 2, 4 or 8 PRB pairs. Different EPDCCH sets may configure different numbers of PRB pairs.
In the conventional EPDCCH resource allocation method, a set is selected from a plurality of pre-divided frequency resource sets according to CQI information and system information (such as scheduling information or occupation of frequency resources by other UEs) reported by the UE, and the set is used as an EPDCCH set allocated to the UE.
According to the EPDCCH resource configuration method, a set is selected from a plurality of EPDCCH sets according to CQI reported by UE, the actual utilization rate of EPDCCH resources in a cell is not considered, and when the number of the EPDCCH sets and the number of PRBs (physical downlink control channel) pair in the set are configured for the UE, the configuration is carried out through RRC (radio resource control) signaling, and the CQI information cannot be reflected on the resource configuration in time, so that the situation that the EPDCCH resources allocated for the UE are excessive and left exists, PDSCH (physical downlink shared channel) resources are wasted, and the downlink service of a PDSCH (physical downlink shared channel) is adversely affected. In addition, the multiple EPDCCH sets distributed in the frequency domain may scatter the PDSCH channel, reducing the PDSCH channel transmission performance.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a resource allocation method for an enhanced physical downlink control channel, which can effectively avoid the waste of EPDCCH resources.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a resource allocation method for an enhanced physical downlink control channel comprises the following steps:
in each preset resource adjustment period, counting the ECCE utilization rate of an enhanced control channel unit (ECCE) of an Enhanced Physical Downlink Control Channel (EPDCCH) of a cell in the period and the downlink load of the cell;
and according to the ECCE utilization rate of the EPDCCH and the cell downlink load counted in the current period, adjusting the EPDCCH resource allocation shared by the user equipment UE configured to use the EPDCCH in the cell according to the principle of maximally allocating the EPDCCH resources to the user while meeting the cell downlink load requirement.
In summary, the resource allocation method for enhancing the physical downlink control channel provided by the invention allocates the appropriate EPDCCH resource to the UE according to the actual network load condition and the ECCE utilization rate of the EPDCCH, so that the user transmission needs can be fully met, and the EPDCCH resource waste can be effectively avoided.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of 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 further detail with reference to the accompanying drawings and specific embodiments.
The core idea of the invention is as follows: the method comprises the steps of periodically judging whether to adjust and how to adjust the number of EPDCCH sets of a user and the number of PRBs in the sets according to the downlink load condition of a network and the ECCE utilization rate of the EPDCCH, and triggering corresponding adjustment, so that the EPDCCH resources can be allocated to the user in a maximized manner according to the requirement of the user on the EPDCCH on the premise of ensuring the PDSCH transmission performance, the user transmission requirement can be fully met, and the EPDCCH resource waste can be avoided.
Fig. 1 is a flowchart illustrating a first embodiment of the present invention, and as shown in fig. 1, the method for allocating EPDCCH mainly includes:
In this step, it is necessary to count the ECCE utilization rate of the EPDCCH and the downlink load of the cell in each preset resource adjustment period, so that the EPDCCH resource configured by the base station for each UE can be periodically adjusted based on the parameter values counted in each period.
Here, the ECCE utilization of the EPDCCH is a ratio of the number of ECCEs of the EPDCCH actually used by all users in the cell to the number of ECCEs of the EPDCCH allocated to all users. The cell downlink load is the number of PRB pairs used by the cell downlink service. The former can reflect the actual demand of current cell UE for EPDCCH resources, and the latter can reflect the resource demand of cell downlink service. In the subsequent steps, the EPDCCH resources of the UE are adjusted and configured based on the EPDCCH resources and the PDSCH resources, and the EPDCCH resources with proper quantity can be configured for the UE, so that the transmission requirement of the UE can be met, the waste of the EPDCCH resources can be reduced, and the EPDCCH uses the PDSCH resources to send the DCI, so that the reduction of the quantity of the usable resources of the downlink service due to the fact that the EPDCCH occupies more downlink transmission resources can be avoided, and further the adverse effect on the downlink service of the PDSCH channel is avoided.
In practical applications, the length of the resource adjustment period may be preferably greater than or equal to the cell load evaluation trigger period of the system.
In this step, in each period, the EPDCCH resource of the UE configured to use the EPDCCH in the cell is adjusted according to the ECCE utilization of the EPDCCH in the cell and the downlink load of the cell, which are counted in the period. Here, when the adjustment is performed, the adjustment is performed according to a principle that EPDCCH resources are allocated to a user in a maximized manner while a cell downlink load requirement is met, so that it can be ensured that a transmission requirement of a current cell downlink service can be met, and EPDCCH resources matched with a requirement of the UE can be configured for the UE, so that the EPDCCH resources can be obtained at the same time: the downlink transmission requirement of the UE is met, and the waste of EPDCCH resources is avoided.
In addition, unlike the existing scheme, this step does not need to configure an EPDCCH resource for each UE, but all UEs configured to use an EPDCCH in the cell use the same EPDCCH resource configuration in a unified manner, that is, the EPDCCH resource configuration is multiplexed by all UEs configured to use an EPDCCH in the cell, so that the EPDCCH resource configuration process can be simplified.
In practical applications, the number of EPDCCH sets configured by the system for each UE (that is, the number of EPDCCH sets included in the EPDCCH resource configuration) may be distinguished, so as to implement adjustment of the EPDCCH resource configuration of the UE.
When the EPDCCH set configured by the system for the UE is only one EPDCCH set (i.e. the EPDCCH resource configuration includes only one EPDCCH set), the following method may be preferably adopted for the adjustment of the EPDCCH resource for the UE:
if the ECCE utilization rate of the EPDCCH is larger than a preset EPDCCH ECCE maximum utilization rate threshold, judging whether the EPDCCH resource of the UE can meet the cell downlink load requirement after being increased according to a preset resource increasing rule according to the cell downlink load, and if so, adjusting the EPDCCH resource configuration of the UE according to the resource increasing rule.
Here, when the ECCE utilization of the EPDCCH is greater than the EPDCCH ECCE maximum utilization threshold, it indicates that the current EPDCCH resource utilization is large, and it needs to be considered that the EPDCCH resource allocation number of the UE is increased on the premise of ensuring that the downlink load requirement of the cell is met.
If the ECCE utilization rate of the EPDCCH is less than a preset EPDCCH ECCE minimum utilization rate threshold, reducing the number of PRB pair in the EPDCCH set of the UE by half when the number of PRB pair in the EPDCCH set configured for the UE by the system is greater than a preset minimum configurable number.
Here, when the ECCE utilization of the EPDCCH is less than the EPDCCH ECCE minimum utilization threshold, it is indicated that the current EPDCCH resource utilization is small, and there is a problem of resource waste, so to avoid waste, it is necessary to reduce the EPDCCH resource of the UE, that is, to reduce the number of PRB pairs in the EPDCCH set by half.
The EPDCCH ECCE maximum utilization rate threshold and the EPDCCH ECCE minimum utilization rate threshold may be specifically set by those skilled in the art according to actual needs, and are not described herein again.
It should be noted that the EPDCCH uses PDSCH resources to transmit DCI, and in each downlink subframe, each user may use 1 or 2 EPDCCH sets, each EPDCCH set is composed of 2, 4, or 8 PRBs. The maximum configurable number and the minimum configurable number are respectively the maximum value and the minimum value of the configurable PRB pair number in one EPDCCH set. Wherein the maximum configurable number will be limited to the actual cell bandwidth. For example, when the bandwidth is 1.4M, the number of downlink PRBs pair
Therefore, each set can only configure 4 PRBs pair at most, and when the bandwidth is larger than 1.4M, 8 PRBs can be configured at most. Specifically, the maximum configurable number and the minimum configurable number may be set by a person skilled in the art according to an actual application scenario, and are not described herein again.
Preferably, in the scheme for performing EPDCCH resource adjustment on the UE in the case that the current EPDCCH set is only one, when the ECCE utilization of the EPDCCH is greater than the EPDCCH ECCE maximum utilization threshold, the resource increase rule may specifically include the following:
when the number of PRB pairs in the EPDCCH set configured for the UE by the system is less than the maximum configurable number, doubling the number of PRB pairs in the EPDCCH set of the UE; when the number of PRB pairs in an EPDCCH set which has been configured by a system for the UE is equal to a preset maximum configurable number, adding a new EPDCCH set P2 for the UE, wherein the number of PRB pairs in the EPDCCH set P2 is the minimum configurable number.
Preferably, based on the resource increasing rule, the following method may be adopted to determine whether the EPDCCH resource of the UE can meet the cell downlink load requirement after being increased according to the resource increasing rule:
when the number of PRB pair in the EPDCCH set configured by the system for the UE is less than the maximum configurable number, if the downlink load of the cell is less than Nz，
And judging that the downlink load requirement of the cell can be met after the EPDCCH resources of the UE are increased according to the resource increasing rule. The above-mentioned
For the number of PRBs pair available for PDSCH transmission in the entire cell bandwidth, the
The number of PRB pair in an EPDCCH set configured for the UE by a system;
when the number of PRB pair in the EPDCCH set configured by the system for the UE is equal to the maximum configurable number, if the downlink load of the cell is less than Nk，
And judging that the downlink load requirement of the cell can be met after the EPDCCH resources of the UE are increased according to the resource increasing rule.
s is the minimum value of the configurable number of PRB pairs in the preset EPDCCH set, and preferably s may be 2.
When the EPDCCH set configured by the system for the UE includes a first EPDCCH set and a second EPDCCH set, and the number of PRB pairs in the first EPDCCH set is a preset maximum configurable number, preferably, the following method may be used to adjust an EPDCCH resource for the UE:
if the ECCE utilization rate of the EPDCCH is greater than a preset EPDCCH ECCE maximum utilization rate threshold, judging whether the cell downlink load requirement can be met after the PRB pair number in the second EPDCCH set is doubled according to the cell downlink load when the PRB pair number in the second EPDCCH set is smaller than a preset maximum configurable number, and if so, doubling the PRB pair number in the second EPDCCH set.
Here, when the ECCE utilization of the EPDCCH is greater than the EPDCCH ECCE maximum utilization threshold, it is considered that the number of PRB pairs in the second EPDCCH set is increased, so as to increase an EPDCCH resource of the UE to meet a current EPDCCH transmission requirement.
If the ECCE utilization rate of the EPDCCH is less than a preset EPDCCH ECCE utilization rate minimum threshold, reducing the number of PRB pairs in the second EPDCCH set of the UE by half when the number of PRB pairs in the second EPDCCH set configured for the UE by the system is greater than a preset minimum configurable number, and deleting the second EPDCCH set from the EPDCCH set range of the UE when the number of PRB pairs in the second EPDCCH set configured for the UE by the system is equal to the minimum configurable number.
Here, when the ECCE utilization of the EPDCCH is less than the EPDCCH ECCE utilization minimum threshold, reducing the number of PRB pair in the second EPDCCH set or canceling the configuration of the second EPDCCH set is considered, so as to reduce EPDCCH resources of the UE and avoid the problem of EPDCCH resource waste.
Preferably, the method may determine whether the cell downlink load requirement can be met after the number of PRB pairs in the second EPDCCH set is increased by one time by using the following method:
judging whether the downlink load of the cell is less than Ns，
If so, determining that the cell downlink load requirement can be met after the number of PRB pairs in the second EPDCCH set is doubled. The above-mentioned
For the number of PRBs pair available for PDSCH transmission in the entire cell bandwidth, the
The number of PRB pairs in the first EPDCCH set; the above-mentioned
Is the number of PRBs pair in the second EPDCCH set.
Preferably, in order to match the EPDCCH resource configured for the UE for the first time with the cell bandwidth in the actual system, an EPDCCH set p may be allocated to the UE when the EPDCCH resource is configured for the first time1And according to the system bandwidth of the cell
Determining the EPDCCH set p1The number of PRB pair in (1).
Preferably, the EPDCCH set p may be determined according to a cell system bandwidth by the following method1Number of PRB pair:
if it is not
Configuring the EPDCCH set p1Comprises 4 PRB pairs, 0<a<b；
If it is not
Configuring the EPDCCH set p1Contains 2 PRB pairs.
The preset parameters a and b can be set by those skilled in the art according to actual needs, for example, a is 50, and b is 100.
Further, in order to avoid the problem that the PDSCH channel is scattered by a plurality of EPDCCH sets distributed in the frequency domain in the existing system, thereby reducing the transmission performance of the PDSCH channel, in step 102, the EPDCCH resource may be adjusted according to the principle of configuring the continuous EPDCCH resource in the frequency domain for the UE. In this way, by ensuring that the UE is configured with continuous EPDCCH resources in the frequency domain, PDSCH channel transmission performance can be ensured.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A resource allocation method for an enhanced physical downlink control channel (ePDCCH) is characterized by comprising the following steps:
in each preset resource adjustment period, counting the ECCE utilization rate of an enhanced control channel unit (ECCE) of an Enhanced Physical Downlink Control Channel (EPDCCH) of a cell in the period and the downlink load of the cell;
according to the ECCE utilization rate of the EPDCCH and the cell downlink load counted in the current period, adjusting the EPDCCH resource allocation shared by User Equipment (UE) which is configured to use the EPDCCH in the cell according to the principle of maximally allocating the EPDCCH resources to the user while meeting the cell downlink load requirement;
when the EPDCCH set configured by the system for the UE is only one EPDCCH set, the adjusting comprises:
if the ECCE utilization rate of the EPDCCH is greater than a preset EPDCCH ECCE maximum utilization rate threshold, judging whether the EPDCCH resource of the UE can meet the cell downlink load requirement after being increased according to a preset resource increasing rule according to the cell downlink load, and if so, adjusting the EPDCCH resource configuration of the UE according to the resource increasing rule;
if the ECCE utilization rate of the EPDCCH is less than a preset EPDCCH ECCE minimum utilization rate threshold, reducing the number of PRB pair in the EPDCCH set of the UE by half when the number of PRB pair in the EPDCCH set configured for the UE by a system is greater than a preset minimum configurable number;
the resource addition rule includes:
when the number of PRB pairs in the EPDCCH set configured for the UE by the system is smaller than the preset maximum configurable number, doubling the number of PRB pairs in the EPDCCH set of the UE;
when the number of PRB pairs in an EPDCCH set which has been configured for the UE by a system is equal to a preset maximum configurable number, adding a new EPDCCH set P2 for the UE, wherein the number of PRB pairs in the EPDCCH set P2 is the minimum configurable number;
the judging whether the EPDCCH resources of the UE can meet the cell downlink load requirement after being increased according to a preset resource increasing rule comprises the following steps:
when the number of PRB pair in the EPDCCH set configured by the system for the UE is less than the maximum configurable number, if the downlink load of the cell is less than Nz，
Judging that the downlink load requirement of the cell can be met after the EPDCCH resources of the UE are increased according to the resource increasing rule; the above-mentioned
For the number of PRBs pair available for PDSCH transmission in the entire cell bandwidth, the
The number of PRB pair in an EPDCCH set configured for the UE by a system;
when the number of PRB pair in the EPDCCH set configured by the system for the UE is equal to the maximum configurable number, if the downlink load of the cell is less than Nk，
Judging that the downlink load requirement of the cell can be met after the EPDCCH resources of the UE are increased according to the resource increasing rule, wherein s is the minimum configurable number;
when the EPDCCH set configured by the system for the UE includes a first EPDCCH set and a second EPDCCH set, and the number of PRB-pairs in the first EPDCCH set is a preset maximum configurable number, the adjusting includes:
if the ECCE utilization rate of the EPDCCH is greater than a preset EPDCCH ECCE maximum utilization rate threshold, judging whether the cell downlink load requirement can be met after the PRB pair number in the second EPDCCH set is doubled according to the cell downlink load when the PRB pair number in the second EPDCCH set is smaller than the maximum configurable number, and if so, doubling the PRB pair number in the second EPDCCH set;
if the ECCE utilization rate of the EPDCCH is less than a preset EPDCCH ECCE utilization rate minimum threshold, reducing the number of PRB pairs in a second EPDCCH set of the UE by half when the number of PRB pairs in the second EPDCCH set configured for the UE by a system is greater than a preset minimum configurable number, and deleting the second EPDCCH set from the EPDCCH set range of the UE when the number of PRB pairs in the second EPDCCH set configured for the UE by the system is equal to the minimum configurable number;
the determining whether the number of PRB pairs in the second EPDCCH set can meet the cell downlink load requirement after doubling includes:
judging the sizeWhether the district downlink load is less than Ns，
If so, determining that the cell downlink load requirement can be met after the number of PRB pairs in the second EPDCCH set is doubled; the above-mentioned
For the number of PRBs pair available for PDSCH transmission in the entire cell bandwidth, the
The number of PRB pairs in the first EPDCCH set; the above-mentioned
Is the number of PRBs pair in the second EPDCCH set.
2. The method of claim 1, further comprising:
when the EPDCCH resources are configured for the UE for the first time, allocating an EPDCCH set p for the UE1And according to the system bandwidth of the cell
Determining the EPDCCH set p1The number of PRB pair in (1).
3. The method of claim 2, wherein the EPDCCH set p is determined according to a cell system bandwidth1The number of PRB pair in (1) includes:
if it is not
Configuring the EPDCCH set p1Comprises 4 PRB pairs, 0<a<b；
If it is not
Configuring the EPDCCH set p1Contains 2 PRB pairs.
4. The method of claim 3, wherein a is 50 and b is 100.
5. The method of claim 1, wherein the resource adjustment period is equal to or greater than a cell load evaluation trigger period.
6. The method of claim 1, further comprising:
and adjusting the EPDCCH resources according to the principle of configuring continuous EPDCCH resources on the frequency domain for the UE.
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