阅读说明：本技术 一种cce聚集级别的确定方法和装置 (Method and device for determining CCE aggregation level ) 是由 王梦茹 黄伟 鲜柯 于 2018-07-23 设计创作，主要内容包括：本申请提供了一种CCE聚集级别的确定方法和装置,该方法包括：针对任一用户,计算该用户的控制信道的接收信噪比；周期性统计控制信道的CCE利用率；当统计的CCE利用率小于第一门限值时,根据当前TTI对应的DCI format以及计算的控制信道的接收信噪比,确定该用户对应的CCE聚集级别。该方法能够基于信道质量和控制信道负荷的基础上灵活、合理确定CCE聚集级别。(The application provides a method and a device for determining CCE aggregation level, wherein the method comprises the following steps: aiming at any user, calculating the receiving signal-to-noise ratio of a control channel of the user; periodically counting the CCE utilization rate of the control channel; and when the statistical CCE utilization rate is smaller than a first threshold value, determining the CCE aggregation level corresponding to the user according to the DCI format corresponding to the current TTI and the calculated receiving signal-to-noise ratio of the control channel. The method can flexibly and reasonably determine the CCE aggregation level on the basis of the channel quality and the control channel load.)

1. A method for determining a CCE aggregation level, the method comprising:

aiming at any user, calculating the receiving signal-to-noise ratio of a control channel of the user;

periodically counting the CCE utilization rate of the control channel;

and when the counted CCE utilization rate is smaller than a first threshold value, determining the CCE aggregation level corresponding to the user according to the format DCI format of the downlink control information corresponding to the current transmission time interval TTI and the calculated receiving signal-to-noise ratio of the control channel.

2. The method of claim 1, further comprising:

and when the counted CCE utilization rate is not less than the first threshold value, determining the CCE aggregation level corresponding to the user according to the counted CCE utilization rate, the DCIformat corresponding to the current TTI and the calculated receiving signal-to-noise ratio of the control channel.

3. The method of claim 2,

the aggregation levels of CCEs include: a first aggregation level, a second aggregation level, a third aggregation level, and a fourth aggregation level;

wherein the first aggregation level is an aggregation level occupying 1 CCE, the second aggregation level is an aggregation level occupying 2 CCEs, the third aggregation level is an aggregation level occupying 4 CCEs, and the fourth aggregation level is an aggregation level occupying 8 CCEs;

and determining that the demodulation threshold corresponding to the first aggregation level is a first demodulation threshold, the demodulation threshold corresponding to the second aggregation level is a second demodulation threshold, the demodulation threshold corresponding to the third aggregation level is a third demodulation threshold, and the demodulation threshold corresponding to the fourth aggregation level is a fourth demodulation threshold according to the DCI format.

4. The method of claim 3, wherein the determining the CCE aggregation level corresponding to the user according to the DCI format corresponding to the current TTI and the calculated received signal-to-noise ratio of the control channel comprises:

when the receiving signal-to-noise ratio of the control channel is larger than a first demodulation threshold, determining the CCE aggregation level of the user as a first aggregation level;

when the receiving signal-to-noise ratio of the control channel is not larger than the first demodulation threshold and is larger than the second demodulation threshold, determining the CCE aggregation level of the user as a second aggregation level;

when the receiving signal-to-noise ratio of the control channel is not greater than the second demodulation threshold and is greater than the third demodulation threshold, determining the CCE aggregation level of the user as a third aggregation level;

and when the received signal-to-noise ratio of the control channel is not greater than the third demodulation threshold, determining the CCE aggregation level of the user as a fourth aggregation level.

5. The method of claim 3, wherein the determining the CCE aggregation level corresponding to the user according to the statistical CCE utilization, the DCI format corresponding to the current TTI and the calculated received signal-to-noise ratio of the control channel comprises:

when the receiving signal-to-noise ratio of the control channel is larger than a first demodulation threshold, determining the CCE aggregation level of the user as a first aggregation level;

when the receiving signal-to-noise ratio of the control channel is not larger than the first demodulation threshold and is larger than the second demodulation threshold, determining the CCE aggregation level of the user as a second aggregation level;

when the receiving signal-to-noise ratio of the control channel is not greater than the second demodulation threshold and is greater than the third demodulation threshold, if the CCE utilization rate is determined to be greater than the second threshold, the CCE aggregation level of the user is determined to be the second aggregation level; otherwise, determining the CCE aggregation level of the determined user of the user as a third aggregation level;

when the receiving signal-to-noise ratio of the control channel is not greater than the third demodulation threshold and is greater than the fourth demodulation threshold, if the CCE utilization rate is determined to be greater than the second threshold, the CCE aggregation level of the determined user of the user is determined to be a third aggregation level; otherwise, determining the CCE aggregation level of the determined user of the user as a fourth aggregation level;

and when the received signal-to-noise ratio of the control channel is not greater than the fourth demodulation threshold, determining the CCE aggregation level of the determined user of the user as a fourth aggregation level.

6. An apparatus for determining a control channel element, CCE, aggregation level, the apparatus comprising: the device comprises a calculation unit, a statistic unit and a determination unit;

the calculating unit is used for calculating the receiving signal-to-noise ratio of the control channel of any user;

the statistic unit is used for periodically counting the CCE utilization rate of the control channel;

and the determining unit is configured to determine, when the CCE utilization counted by the counting unit is smaller than a first threshold, a CCE aggregation level corresponding to the user according to the format DCI format of the downlink control information corresponding to the current TTI and the received signal-to-noise ratio of the control channel calculated by the calculating unit.

7. The apparatus of claim 6,

the determining unit is further configured to determine, when the CCE utilization counted by the counting unit is not less than a first threshold, a CCE aggregation level corresponding to the user according to the counted CCE utilization, the DCI format corresponding to the current TTI, and the calculated received signal-to-noise ratio of the control channel.

8. The apparatus of claim 7,

the aggregation levels of CCEs include: a first aggregation level, a second aggregation level, a third aggregation level, and a fourth aggregation level;

wherein the first aggregation level is an aggregation level occupying 1 CCE, the second aggregation level is an aggregation level occupying 2 CCEs, the third aggregation level is an aggregation level occupying 4 CCEs, and the fourth aggregation level is an aggregation level occupying 8 CCEs;

the determining unit is further configured to determine, according to the DCI format, that a demodulation threshold corresponding to the first aggregation level is a first demodulation threshold, a demodulation threshold corresponding to the second aggregation level is a second demodulation threshold, a demodulation threshold corresponding to the third aggregation level is a third demodulation threshold, and a demodulation threshold corresponding to the fourth aggregation level is a fourth demodulation threshold.

9. The apparatus of claim 8,

the determining unit is specifically configured to determine, when the CCE aggregation level corresponding to the user is determined according to the DCI format corresponding to the current TTI and the calculated received signal-to-noise ratio of the control channel, and when the received signal-to-noise ratio of the control channel is greater than a first demodulation threshold, the CCE aggregation level of the user is determined to be a first aggregation level; when the receiving signal-to-noise ratio of the control channel is not larger than the first demodulation threshold and is larger than the second demodulation threshold, determining the CCE aggregation level of the user as a second aggregation level; when the receiving signal-to-noise ratio of the control channel is not greater than the second demodulation threshold and is greater than the third demodulation threshold, determining the CCE aggregation level of the user as a third aggregation level; and when the received signal-to-noise ratio of the control channel is not greater than the third demodulation threshold, determining the CCE aggregation level of the user as a fourth aggregation level.

10. The apparatus of claim 8,

the determining unit is specifically configured to determine, when the CCE aggregation level corresponding to the user is determined according to the counted CCE utilization rate, the DCI format corresponding to the current TTI, and the calculated received signal-to-noise ratio of the control channel, and when the received signal-to-noise ratio of the control channel is greater than a first demodulation threshold, determine the CCE aggregation level of the user as a first aggregation level; when the receiving signal-to-noise ratio of the control channel is not larger than the first demodulation threshold and is larger than the second demodulation threshold, determining the CCE aggregation level of the user as a second aggregation level; when the receiving signal-to-noise ratio of the control channel is not greater than the second demodulation threshold and is greater than the third demodulation threshold, if the CCE utilization rate is determined to be greater than the second threshold, the CCE aggregation level of the user is determined to be the second aggregation level; otherwise, determining the CCE aggregation level of the determined user of the user as a third aggregation level; when the receiving signal-to-noise ratio of the control channel is not greater than the third demodulation threshold and is greater than the fourth demodulation threshold, if the CCE utilization rate is determined to be greater than the second threshold, the CCE aggregation level of the determined user of the user is determined to be a third aggregation level; otherwise, determining the CCE aggregation level of the determined user of the user as a fourth aggregation level; and when the received signal-to-noise ratio of the control channel is not greater than the fourth demodulation threshold, determining the CCE aggregation level of the determined user of the user as a fourth aggregation level.

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a CCE aggregation level.

Background

In the existing communication system, a Physical Downlink Control Channel (PDCCH) Channel is used to carry uplink and downlink Control information, and user scheduling is implemented by using the PDCCH Channel. In order to more efficiently configure the time-frequency resources of PDCCH and other downlink control channels, LTE defines two dedicated control channel resource units: RE groups (REGs) and Control Channel Elements (CCEs).

Wherein one CCE is composed of 9 REGs. When PDCCH resource allocation is performed, according to different resource requirements, N CCEs may be allocated in units, where N denotes an aggregation level of CCEs. In current communication systems, the aggregation levels of CCEs are divided into 1, 2, 4 and 8.

In a communication system, PDCCH resources are very limited, especially in small bandwidths. For example, in the case of two transmit antennas and two receive antennas (2T2R), when the system bandwidth is 1.4M, only 6 CCEs are available; when the system bandwidth is 3M, only 12 CCEs are available at most. When the CCE is commonly used by the uplink and the downlink, the CCE resources are more tense.

Currently, when resource allocation is performed on a PDCCH, a CCE common space (PDCCH for carrying group messages, system messages, and the like) is limited to 16 CCEs at maximum, and the aggregation level of the CCEs in the common space is 4 or 8; meanwhile, the maximum ratio of the uplink CCE to the downlink CCE is adjusted to be 1:2, and the adjustment is carried out according to the use condition of the CCE.

Disclosure of Invention

In view of this, the present application provides a method and an apparatus for determining a CCE aggregation level, which are capable of flexibly and reasonably determining the CCE aggregation level based on channel quality and control channel load.

In order to solve the technical problem, the technical scheme of the application is realized as follows:

a method of determining a CCE aggregation level, the method comprising:

aiming at any user, calculating the receiving signal-to-noise ratio of a control channel of the user;

periodically counting the CCE utilization rate of the control channel;

and when the statistical CCE utilization rate is smaller than a first threshold value, determining the CCE aggregation level corresponding to the user according to the DCI format corresponding to the current TTI and the calculated receiving signal-to-noise ratio of the control channel.

An apparatus for determining a CCE aggregation level, the apparatus comprising: the device comprises a calculation unit, a statistic unit and a determination unit;

the calculating unit is used for calculating the receiving signal-to-noise ratio of the control channel of any user;

the statistic unit is used for periodically counting the CCE utilization rate of the control channel;

and the determining unit is configured to determine, when the CCE utilization counted by the counting unit is smaller than a first threshold, a CCE aggregation level corresponding to the user according to the DCI format corresponding to the current TTI and the received signal-to-noise ratio of the control channel calculated by the calculating unit.

According to the technical scheme, the CCE aggregation level of the user is determined by introducing the receiving signal-to-noise ratio of the control channel of the user and the CCE utilization rate of the control channel. The scheme can flexibly and reasonably determine the CCE aggregation level on the basis of the channel quality and the control channel load.

Drawings

Fig. 1 is a schematic diagram of a process for determining CCE aggregation levels according to a first embodiment of the present disclosure;

fig. 2 is a schematic diagram of a process for determining CCE aggregation levels according to a second embodiment of the present application;

fig. 3 is a schematic structural diagram of an apparatus applied to the above-described technology in the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.

The embodiment of the application provides a method for determining a CCE aggregation level, which determines the CCE aggregation level of a user by introducing a receiving signal-to-noise ratio of a control channel of the user and a CCE utilization rate of the control channel. The scheme can flexibly and reasonably determine the CCE aggregation level on the basis of the channel quality and the control channel load.

The PDCCH is a main channel for carrying downlink physical layer control signaling, and the carried physical layer control information includes scheduling information of uplink/downlink data transmission and uplink power control command information.

The PDCCH channel transmits control information in the form of CCE, and is implemented specifically as follows:

1 CCE is composed of 9 REGs, aggregation levels (aggregation levels) of 4 PDCCHs are defined in the 3GPP protocol, and occupy 1, 2, 4, and 8 CCEs, respectively, and hereinafter, these four aggregation levels are referred to as a first aggregation level (AggLvl _1), a second aggregation level (Agg _ Lvl _2), a third aggregation level (Agg _ Lvl _4), and a fourth aggregation level (Agg _ Lvl _8), respectively.

The method specifically comprises the following steps: the first aggregation level is an aggregation level occupying 1 CCE, the second aggregation level is an aggregation level occupying 2 CCEs, the third aggregation level is an aggregation level occupying 4 CCEs, and the fourth aggregation level is an aggregation level occupying 8 CCEs;

the determination process of the CCE aggregation level according to the present invention is described in detail below with two embodiments.