CN114363972A - BWP switching method based on physical downlink control channel - Google Patents
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Abstract
The invention discloses a BWP switching method based on a physical downlink control channel, which ensures smooth communication. The method of the invention is used for triggering BWP switching through DCI indication by PDCCH, and improving the aggregation level of a physical downlink control channel according to the channel quality when the DCI indicating the BWP switching is issued; the method comprises the following steps: (10) acquiring channel quality: a base station acquires channel quality from UE; (20) and (3) polymerization grade promotion: according to the channel quality and the original aggregation level, upgrading to the current aggregation level; (30) and (3) issuing an instruction: the base station issues a DCI instruction for BWP switching according to the current aggregation level; (40) receiving an instruction: the UE receives a DCI instruction; (50) BWP switching: and according to the DCI instruction, the base station synchronously performs BWP switching with the UE.
Description
Technical Field
The invention belongs to the technical field of wireless communication networks, in particular to a BWP switching method based on a physical downlink control channel.
Background
BWP is known as Bandwidth Part, or as sub-wideband. One BWP is a subset of consecutive resource blocks on a given carrier bandwidth. The NR protocol (38.300) describes that the terminal can adapt and adjust its actual operating bandwidth by using the BP technique, instead of operating bandwidth of the whole cell, and can operate on different sub-band BWPs, and the subcarrier spacing on these BWPs can be different, so as to flexibly implement different service application scenarios. A network side allocates a continuous bandwidth resource to a UE (user equipment, such as a mobile phone, a tablet computer or a modem), so that flexible transmission bandwidth configuration of the network side and the UE side can be realized; each BWP corresponds to a particular parameter set (Numerology). Is the necessary configuration for 5GUE to access NR networks.
In LTE, the bandwidth of the UE is consistent with the bandwidth of the system, and the bandwidth is configured by decoding MIB information and then remains unchanged. In NR, the bandwidth of the UE may be dynamically changed. For example, at the first moment, the traffic of the UE is large, and the system configures a large bandwidth (BWP1) for the UE; at the second moment, the traffic of the UE is smaller, and the system configures a small bandwidth (BWP2) for the UE to meet the basic communication requirement; at the third moment, the system finds that BWP1 has wide frequency selective fading in the bandwidth, or BWP1 has scarce resources in the frequency range, and then allocates a new bandwidth (BWP3) to the UE. The UE only needs to adopt the center frequency point and the sampling rate of the corresponding BWP in the corresponding BWP. Moreover, each BWP is not only frequency point and bandwidth diverse, but each BWP may correspond to a different configuration. For example, the subcarrier spacing, CP type, SSB (PSS/SSS PBCH Block) period, etc. of each BWP may be configured differently to accommodate different services.
The maximum supported frequency bandwidth of 5GNR reaches 400M, and if the terminal is expected to be as long as LTE, the whole frequency bandwidth is unnecessarily supported by the transceiving operation bandwidth every time, which will put high demands on the radio frequency performance of the terminal, and it is difficult to realize the integration of the chip, and the cost will be very high. Therefore, NR proposes a concept of Bandwidth Adaptation (BP).
The main in-class application scenarios of BWP include: the method is applied to the access of the UE with small bandwidth capability to the large bandwidth network; the UE is switched between the large BWP and the small BWP, so that the power saving effect is achieved; different BWPs, configure different Numerology, carry different traffic. Wherein, the switching BWP is indicated by DCI (Downlink Control Information) to be a dynamic BWP switching mode. BWP adaptation is the behavior of the UE in RRC connected state, switching between configured Dedicated BWPs (only 1 Dedicated BWP can be activated at a certain time).
In the NR FDD system, one UE can configure 4 DL BWPs and 4 UL BWPs at most. In the NR TDD system, one UE configures 4 BWP pairs at maximum. The BWP Pair means that DL BWP ID is the same as UL BWP ID, and the center frequency points of DL BWP and UL BWP are the same, but the bandwidth and the subcarrier spacing may not be consistent.
BWPs are mainly classified into two categories: initial BWP and Dedicated BWP. The Initial BWP is mainly used for UE to receive RMSI, OSI to initiate random access, etc. While the Dedicated BWP is mainly used for data traffic transmission, the bandwidth of the Dedicated BWP is generally larger than that of the Initial BWP.
Although DL/UL can configure up to 4 BWPs, only one BWP can be active at a time. This means that only one BWP can be selected as active state at a time. The selection or switching of BWP according to the operation rule of BWP at 38.321 can be achieved in several ways.
1. Through the DCI delivered by the PDCCH, a certain BWP to be switched may be delivered under an indication flag of the BWP of DCI format 0_1(UL grant) or DCI format 1_1(DL schedule);
2. by bwp-inactivation timer;
3. through RRC signaling;
4. a random access procedure by the MAC entity.
Pdcch (physical Downlink Control channel) refers to a physical Downlink Control channel. The PDCCH carries scheduling and other control information, specifically including transport format, resource allocation, uplink scheduling grant, power control, uplink retransmission information, and the like. The PDCCH channel mainly carries PUSCH and PDSCH channel Control Information (DCI), and PDCCH Information of different terminals is distinguished by corresponding RNTI Information, that is, crc of DCI is scrambled by RNTI.
The method is mainly used for switching the BWP through DCI delivered through the PDCCH.
However, it has major problems: if the DCI issuing indicating the BWP handover fails, the BWP configurations maintained by the gNB and the UE are inconsistent, which greatly affects the data transmission and reception of the UE and affects the total throughput of the 5G cell.
Therefore, the prior art has the problems that: the success rate of BWP switching based on a physical downlink control channel PDCCH is not high enough, so that BWP switching of a base station side and a UE side is asynchronous, and communication between the UE and the base station is not smooth.
Disclosure of Invention
The invention aims to provide a BWP switching method based on a physical downlink control channel, which ensures smooth communication.
The technical solution for realizing the purpose of the invention is as follows:
a BWP switching method based on a physical downlink control channel is used for triggering BWP switching through DCI indication by a PDCCH, and when the DCI indicating the BWP switching is issued, the aggregation level of the physical downlink control channel is improved according to the channel quality.
Preferably, the first and second electrodes are formed of a metal,
when DCI for indicating BWP switching is issued, preferentially increasing 2 levels on the basis of the original aggregation level as the current aggregation level, and increasing the level to 16 at most;
if the corresponding CCE resources can not be searched and matched under the condition of increasing the level 2, the level is reduced again, and the matching is searched again.
As an embodiment, the BWP switching method based on the physical downlink control channel of the present invention includes the following steps:
(10) acquiring channel quality: a base station acquires channel quality from UE;
(20) and (3) polymerization grade promotion: according to the channel quality and the original aggregation level, upgrading to the current aggregation level;
(30) and (3) issuing an instruction: the base station issues a DCI instruction for BWP switching according to the current aggregation level;
(40) receiving an instruction: the UE receives a DCI instruction;
(50) BWP switching: and according to the DCI instruction, the base station synchronously performs BWP switching with the UE.
As an improvement, between the (40) instruction receiving and (50) BWP switching step, further comprising:
(42) and (3) instruction analysis: the UE analyzes the DCI instruction and feeds back DCI instruction content to the base station;
(44) comparing instruction contents: the base station compares the DCI command issuing content with the DCI command feedback content sent by the base station;
(46) and (3) failed retransmission: and when the feedback DCI instruction is not consistent with the DCI issuing instruction, skipping to (30) the instruction issuing step, and the base station issues the DCI instruction again.
Compared with the prior art, the invention has the following remarkable advantages:
BWP switches over the success rate to be high, the communication is unblocked: when the base station side issues DCI indicating BWP switching, the invention improves the demodulation success rate of UE when the PDCCH issues the DCI and reduces the possibility of DCI issuing failure by improving the aggregation levels (PDCCH aggregation levels) of the physical downlink control channel, thereby ensuring that the wireless communication between the base station and the UE is always carried out on the same BWP and ensuring the communication is smooth.
The invention is described in further detail below with reference to the figures and the detailed description.
Drawings
Fig. 1 is a flowchart of a BWP handover method based on a physical downlink control channel according to the present invention.
Detailed Description
The BWP switching method based on the physical downlink control channel is used for triggering BWP switching through DCI (Downlink control information) indication by a PDCCH (physical downlink control channel), and when the DCI indicating the BWP switching is issued, the aggregation level of the physical downlink control channel is improved according to the channel quality.
Preferably, the first and second electrodes are formed of a metal,
when DCI for indicating BWP switching is issued, preferentially increasing 2 levels on the basis of the original aggregation level as the current aggregation level, and increasing the level to 16 at most;
if the corresponding CCE resources can not be searched and matched under the condition of increasing the level 2, the level is reduced again, and the matching is searched again.
In order to improve the success rate of triggering BWP switching by using DCI issuing, the invention improves PDCCH aggregation levels, namely the aggregation level of a physical downlink control channel, when DCI indicating BWP switching is issued, thereby improving the demodulation success rate of UE when the DCI is issued by the PDCCH; is favorable for ensuring smooth communication.
As an embodiment, as shown in fig. 1, the BWP switching method based on the physical downlink control channel of the present invention includes the following steps:
(10) acquiring channel quality: a base station acquires channel quality from UE;
(20) and (3) polymerization grade promotion: according to the channel quality and the original aggregation level, upgrading to the current aggregation level;
preferably, the current aggregation level is raised at the original aggregation level according to the following rules:
if the original aggregation level is 1, the current aggregation level is 4; if the corresponding PDCCH resources cannot be allocated by using the current aggregation level of 4, backspacing to use the current aggregation level of 2, and allocating the PDCCH resources;
if the original aggregation level is 2, the current aggregation level is 8, and if the corresponding PDCCH resources cannot be allocated by using the current aggregation level of 8, the current aggregation level is returned to be 4, and PDCCH resource allocation is carried out;
if the original aggregation level is 4, the current aggregation level is 16, and if the corresponding PDCCH resources cannot be allocated by using the current aggregation level of 16, the current aggregation level is returned to be 8, and PDCCH resource allocation is carried out.
(30) And (3) issuing an instruction: the base station issues a DCI instruction for BWP switching according to the current aggregation level;
(40) receiving an instruction: the UE receives a DCI instruction;
(50) BWP switching: and according to the DCI instruction, the base station synchronously performs BWP switching with the UE.
To further ensure that the UE side correctly resolves the DCI instruction, as an improvement, between the (40) instruction receiving step and the (50) BWP switching step, the method further includes:
(42) and (3) instruction analysis: the UE analyzes the DCI instruction and feeds back DCI instruction content to the base station;
(44) comparing instruction contents: the base station compares the DCI command issuing content with the DCI command feedback content sent by the base station;
(46) and (3) failed retransmission: and when the feedback DCI instruction is not consistent with the DCI issuing instruction, skipping to (30) the instruction issuing step, and the base station issues the DCI instruction again.
The improvement is that before BWP is carried out at the base station side, the information whether the UE has received or whether the DCI is correctly analyzed is obtained, so that wireless communication between the base station and the UE is always carried out on the same BWP, and smooth communication is ensured.
When the DCI for indicating the BWP switching is issued, the method improves the PDCCH aggregation levels so as to improve the demodulation success rate of UE when the PDCCH issues the DCI and reduce the possibility of DCI issuing failure;
preferably, when the DCI for instructing BWP handover is issued, the method for increasing PDCCH aggregation levels increases 2 levels to 16 levels at most on the basis of the currently selected aggregation levels. If the corresponding CCE resources can not be searched and matched under the condition of increasing the level 2, the level is reduced again to search and match again.
The method can improve the demodulation success rate of the UE when the PDCCH issues the DCI and reduce the possibility of DCI issuing failure, thereby ensuring that the wireless communication between the base station and the UE is always carried out on the same BWP and ensuring the smooth communication.
Claims (5)
1. A BWP switching method based on physical downlink control channel is used for PDCCH to trigger BWP switching through DCI indication, and is characterized in that:
and when the DCI for indicating the BWP switching is issued, improving the aggregation level of the physical downlink control channel according to the channel quality.
2. The BWP switching method according to claim 1, wherein,
when DCI for indicating BWP switching is issued, preferentially increasing 2 levels on the basis of the original aggregation level as the current aggregation level, and increasing the level to 16 at most;
if the corresponding CCE resources can not be searched and matched under the condition of increasing the level 2, the level is reduced again, and the matching is searched again.
3. The BWP switching method according to claim 1, characterized in that it comprises the following steps:
(10) acquiring channel quality: a base station acquires channel quality from UE;
(20) and (3) polymerization grade promotion: according to the channel quality and the original aggregation level, upgrading to the current aggregation level;
(30) and (3) issuing an instruction: the base station issues a DCI instruction for BWP switching according to the current aggregation level;
(40) receiving an instruction: the UE receives a DCI instruction;
(50) BWP switching: and according to the DCI instruction, the base station synchronously performs BWP switching with the UE.
4. The BWP switching method according to claim 3, wherein between said (40) receiving of the command and (50) the BWP switching step, further comprising:
(42) and (3) instruction analysis: the UE analyzes the DCI instruction and feeds back DCI instruction content to the base station;
(44) comparing instruction contents: the base station compares the DCI command issuing content with the DCI command feedback content sent by the base station;
(46) and (3) failed retransmission: and when the feedback DCI instruction is not consistent with the DCI issuing instruction, skipping to (30) the instruction issuing step, and the base station issues the DCI instruction again.
5. The BWP handover method based on PDCCH according to one of claims 3 or 4, wherein:
if the original aggregation level is 1, the current aggregation level is 4; if the corresponding PDCCH resources cannot be allocated by using the current aggregation level of 4, backspacing to use the current aggregation level of 2, and allocating the PDCCH resources;
if the original aggregation level is 2, the current aggregation level is 8, and if the corresponding PDCCH resources cannot be allocated by using the current aggregation level of 8, the current aggregation level is returned to be 4, and PDCCH resource allocation is carried out;
if the original aggregation level is 4, the current aggregation level is 16, and if the corresponding PDCCH resources cannot be allocated by using the current aggregation level of 16, the current aggregation level is returned to be 8, and PDCCH resource allocation is carried out.
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