CN113993217A - BWP switching method - Google Patents
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- CN113993217A CN113993217A CN202111266336.9A CN202111266336A CN113993217A CN 113993217 A CN113993217 A CN 113993217A CN 202111266336 A CN202111266336 A CN 202111266336A CN 113993217 A CN113993217 A CN 113993217A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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Abstract
The invention discloses a BWP switching method, which comprises the following steps: step 1, when the terminal works in default BWP, when the terminal has data service transmission, if the default BWP is not matched with the data service, sending BWP switching request message to the base station; step 2, when the base station receives the BWP switching request message sent by the terminal equipment, the base station sends DCI signaling to inform the terminal user to carry out BWP switching and switches to a target BWP; and 3, when the terminal performs data transmission on the non-default BWP, the terminal automatically starts a timer BWP-InactivationTimer, automatically triggers the BWP to fall back to the default BWP after the BWP-InactivationTimer is overtime, and starts to monitor PDCCH and data transmission on the default BWP. The method of the invention can avoid unnecessary frequent fallback by using one Timer to control the timing of BWP fallback, and can save unnecessary DCI signaling overhead and PDCCH blind detection of the terminal.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a BWP (BandWidth Part) switching method.
Background
BWP (BandWidth Part, partial BandWidth) is one of the most important new concepts introduced by 5G NR, the core idea is to define an access BandWidth which is smaller than the system BandWidth of a cell and the processing capacity of the terminal BandWidth, all the transceiving operations of the terminal can be carried out in the smaller BandWidth, thereby realizing the terminal operation which is more flexible, more efficient and lower in power consumption in a 5G large-BandWidth system, the maximum single carrier system BandWidth of LTE is 20MHz, the single carrier BandWidth capacity of the terminal is also 20MHz, the situation that the terminal capacity is smaller than the system BandWidth of the cell does not exist, in the 5G NR system, the maximum carrier BandWidth is greatly improved, the improvement amplitude of the terminal BandWidth capacity obviously cannot catch up with the network side, and the terminal does not need to always work with the maximum BandWidth capacity.
The BWP handover is that when the traffic data volume of a terminal becomes large, a base station and the terminal need to be handed over to a larger BWP simultaneously to meet the requirement of traffic data transmission in order to ensure timely and efficient transmission of traffic data, and when the traffic data volume becomes small, the base station and the terminal need to be handed over to a smaller BWP simultaneously in order to save system frequency domain resources and save energy of the terminal.
The BWP activation based on DCI is a most flexible BWP activation method, and a base station may activate any one BWP at any time, but the BWP activation based on DCI also has disadvantages that a terminal needs to read DCI each time a BWP handover instruction is received, and limited PDCCH blind detection capability is consumed, for activating BWP for data transmission, it is a rational idea to use DCI to indicate BWP handover, because the terminal needs to receive DCI scheduling PDSCH or PUSCH, and receiving BWP handover instructions simultaneously in corresponding DCI does not result in additional PDCCH blind detection, but for BWP handover for other purposes, if the DCI signaling is still used, DCI signaling overhead is wasted.
The problem that the bandwidth processing capacity of the terminal is weaker than that of the base station is well solved by introducing the BWP into the 5G NR, the terminal does not need to work on all frequency domain bandwidths like the base station, the terminal only needs to work on one BWP at a certain moment, and when the traffic data volume is changed from small to large, the BWP with a larger bandwidth needs to be switched to so as to meet the requirement of the traffic rate; when the traffic data volume is decreased from large to small, it needs to switch to BWP with smaller bandwidth to achieve the effect of saving energy.
When BWP switching is needed, the base station issues a DCI signaling to notify the terminal to perform BWP switching, and then switches to a new BWP to transmit data, and after receiving the DCI signaling containing the BWP switching indication, the terminal also switches to the new BWP to receive data.
Based on the above technical problems in the prior art, the present invention provides a BWP switching method.
Disclosure of Invention
The invention provides a BWP switching method, which is used for solving the problems of BWP inconsistency caused by DCI miss detection and BWP frequent switching.
The invention adopts the following technical scheme:
a method of BWP handover, comprising:
step 1, when the terminal works in default BWP, when the terminal has data service transmission, if the default BWP is not matched with the data service, the terminal sends BWP switching request information to a base station;
step 2, when the base station receives the BWP switching request message sent by the terminal equipment, the base station sends DCI signaling to inform the terminal user to carry out BWP switching and switches to a target BWP;
and 3, when the terminal performs data transmission on the non-default BWP, the terminal automatically starts BWP-InactivityTimer (timer), automatically triggers the BWP to fall back to the default BWP after BWP-InactivityTimer is overtime, and starts to monitor PDCCH and data transmission on the default BWP.
Further, in step 3, the terminal performs bwp-inactivity timer reset and operation according to whether the PDCCH is capable of resolving the DCI signaling, and when the PDCCH cannot be monitored after data transmission is completed, the bwp-inactivity timer starts to operate, and when the PDCCH is monitored before bwp-inactivity timer times out, the bwp-inactivity timer is reset.
Further, in step 1, when the current BWP cannot meet the requirement of the data service transmission, the BWP handover request message is used to request the base station to handover to the target BWP, and the target BWP matches with the data service transmission.
Further, in step 1, when the default BWP does not match the target BWP, the terminal sends a BWP handover request message to the base station, including:
when the terminal user has data service transmission, if the default BWP is not matched with the target BWP, the terminal sends a BWP switching request message to the base station; the default BWP and the target BWP respectively correspond to different data service scenarios of the end user, where the data service scenarios include real-time bandwidth data service and non-real-time bandwidth data service, where the real-time bandwidth data service is transmitted by using a real-time bandwidth BWP, and the non-real-time bandwidth data service is transmitted by using a non-real-time bandwidth BWP, where the real-time bandwidth is greater than the non-real-time bandwidth.
Further, in step 1, when operating in the default BWP, the base station acquires the data service transmission requirement of the end user, including:
and acquiring the transmission rate requirement of the data service transmission requirement of the terminal user, and calculating the size of the target BWP according to the transmission rate.
Further, in step 1, when the default BWP does not match the target BWP, the method sends a BWP handover request message to the base station, including:
and when the default BWP does not match the target BWP, if the terminal device is configured with the target BWP in advance, sending a target BWP switching request message to the base station.
Further, in step 2, the terminal incorrectly parses the DCI information, which results in DCI missing detection, the terminal still works on the original BWP, and cannot receive the DCI information and the service data sent by the base station on the new BWP until BWP-inactivytytimer times out, the terminal automatically switches to the default BWP, and starts to monitor the PDCCH and the data on the default BWP; the base station does not receive the HARQ-ACK feedback of the terminal for a period of time, automatically switches to the default BWP, starts to send DCI and service data on the default BWP, and recovers the communication with the terminal.
Further, in step 2, DCI signaling is dedicated to the base station to notify the end user to perform BWP handover, and the target BWP should match the transmission requirement of the end user data service.
Further, in step 2, the receiving, by the base station, the BWP handover request message sent by the terminal device includes:
the base station correctly analyzes the BWP switching request message sent by the terminal equipment, and the BWP switching request message clearly indicates the position and the size of the target BWP to be switched.
Further, in step 2, the base station issues DCI signaling to notify the end user to perform BWP handover, including:
the base station issues DCI signaling according to the target BWP position and size indicated in the BWP handover request message, wherein the DCI signaling comprises the initial position of the target BWP, the size of the BWP and the handover timing of the BWP.
Further, in step 2, the targeted BWP indicated in the DCI signaling includes:
the DCI signaling sent by the base station includes the starting position of the target BWP, the size of the BWP, and whether the target BWP is the same as or different from the target BWP in the BWP handover request message sent by the terminal device.
Further, in step 2, the targeted BWP indicated in the DCI signaling includes:
the base station preferentially uses the target BWP indicated in the BWP handover request message, and if the target BWP is already allocated to other users, the base station selects an available BWP that can match the data service requirement of the terminal from the preconfigured set of BWPs.
Further, in step 3, if the terminal does not monitor the PDCCH until the BWP-inactivity timer times out, the terminal automatically switches to the default BWP and starts to monitor the PDCCH and data transmission on the default BWP.
Further, in step 3, the start condition of the BWP-inactivytytimer is that BWP is activated, the base station starts data transmission on the new BWP, the terminal switches to the activated BWP for data reception, and after a BWP is activated, the BWP-inactivytimer is started immediately.
Compared with the prior art, the invention has the following advantages:
the BWP switching method of the invention utilizes a Timer to control the timing of BWP fallback, can avoid unnecessary frequent fallback, and can save unnecessary DCI signaling overhead and PDCCH blind detection of a terminal.
Drawings
FIG. 1 is a diagram illustrating Timer-based BWP fallback in an embodiment of the present invention;
fig. 2 is a schematic diagram of a terminal losing contact with a base station due to DCI missing detection in the embodiment of the present invention;
fig. 3 is a schematic diagram of a base station resuming communication with a terminal after DCI missing detection in the embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, it being understood that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
Examples
The BWP switching method comprises the following steps:
when there is service data to be transmitted, the base station sends down DCI signaling to inform the terminal to perform BWP switching, and the terminal is switched to non-default BWP to send data;
when a terminal transmits data on non-default BWP, the terminal automatically starts a Timer BWP-InactivtyTimer to trigger the falling of BWP, wherein the terminal resets and operates the Timer according to the monitoring condition of a physical downlink control channel PDCCH, when the data transmission is completed and the PDCCH cannot be monitored, the BWP-InactivtyTimer starts to operate, and when the PDCCH is monitored before the BWP-InactivtyTimer is overtime, the BWP-InactivtyTimer is reset; the terminal does not monitor the PDCCH until BWP-InactivatyTimer is overtime, and if BWP-InactivatyTimer is overtime, the terminal automatically switches to the default BWP and starts to monitor the PDCCH and transmit data on the default BWP.
Specifically, the bs switches to a larger BWP from a smaller BWP which is favorable for power saving through DCI, and after data transmission is completed, the terminal needs to fall back to the smaller BWP to save power consumption, and if DCI is still needed to trigger such BWP switching, additional DCI signaling overhead and unnecessary frequent BWP switching may be caused, and in order to avoid the above problem, a timer BWP-InactivityTimer is used to trigger the fall back of BWP.
By the above method, the DCI signaling overhead and unnecessary BWP frequent switching can be effectively reduced.
Wherein, the reason why the terminal sends the BWP handover request to the base station is that the current BWP cannot meet the requirement of data traffic transmission, so that the target BWP is required to be matched with the data traffic transmission.
The base station issues DCI signaling to inform the terminal user to perform BWP switching by: the base station issues DCI signaling according to the target BWP position and size indicated in the BWP handover request message, the DCI signaling includes the initial position of the target BWP, the size of the BWP and the handover timing of the BWP, and the handover timing of the BWP is predetermined by the base station and the terminal equipment.
Aiming at the DCI missing detection situation, the base station issues DCI containing a BWP switching indication to the terminal and switches to a new BWP for data transmission, but for some reason, the terminal does not correctly analyze the DCI information, the DCI missing detection is caused, the terminal still works on the original BWP, the DCI information and service data sent by the base station on the new BWP cannot be received, after a period of time, BWP-InactivityTimer is overtime, the terminal automatically switches to the default BWP and starts to monitor PDCCH and data transmission on the default BWP, the base station does not receive HARQ-ACK feedback of the terminal for a continuous period of time and also automatically switches to the default BWP, and starts to send the DCI and the service data on the default BWP, namely, the communication between the base station and the terminal is recovered.
In the above embodiment, the configuration of bwp-InactivityTimer is as follows:
the BWP is usually switched by taking a time slot as a unit, the length of BWP-InactivetyTimer is set to be 2 ms-2560 ms, good power saving effect can be obtained, frequent switching of BWP can be avoided by configuring different BWP-InactivetyTimer lengths, in addition, BWP-InactivetyTimer is only suitable for non-default BWP, because BWP-InactivetyTimer is used for controlling the time of falling back to the default BWP, and if the terminal is on the default BWP, the problem of falling back to the default BWP does not exist.
In the above embodiment, the start and restart conditions of bwp-InactivityTimer are as follows:
BWP-InactivationTimer is started when BWP is activated, that is, when a BWP is activated, BWP-InactivationTimer should be started immediately; BWP-InactivtyTimer restart is mainly affected by data scheduling, when the terminal receives the PDCCH for scheduling its data, it is expected that there is also subsequent data scheduling, therefore, no matter how the BWP-InactivtyTimer is running, it should start running from the beginning, i.e. restart BWP-InactivtyTimer, when a new PDCCH is received, BWP-InactivtyTimer is restarted, restart timing, actually prolong the terminal staying at broadband BWP, if the terminal does not receive the PDCCH of new scheduling data before BWP-InactivtyTimer timeout, then fall back to default BWP.
In the above embodiment, the terminal includes a start module and a processing module, where the start module is configured to start or reset the timer bwp-inactivytytimer, and when the PDCCH is not monitored after data transmission is completed, the bwp-inactivytimer starts to operate, and when the PDCCH is monitored before the bwp-inactivytimer times out, the bwp-inactivytimer is reset; if the processing module does not monitor the PDCCH until BWP-inactivytytimer times out, the terminal automatically switches to the default BWP and starts to monitor the PDCCH and transmit data on the default BWP.
As shown in fig. 1, when the terminal is in a non-default BWP (e.g. BWP2), BWP-inactivytytimer is started according to the PDCCH monitoring and PDSCH scheduling conditions, and if the terminal does not monitor DCI scheduling PDSCH for a certain period of time, the BWP is triggered to fall back to the default BWP because of BWP-inactivytimer timeout.
Another advantage of Timer-based BWP fallback is that a fallback mechanism for DCI missed detection is provided, DCI has a certain probability of missed detection and lacks an acknowledgement mechanism such as HARQ-ACK, when DCI missed detection occurs, the terminal cannot switch to the correct BWP according to the indication of DCI, in this case, the base station and the terminal may operate in different BWPs, resulting in terminal desynchronization, as shown in fig. 2, if DCI sent by the base station to switch the UE from BWP2 to BWP3 is not detected by the terminal, the base station will switch to BWP3 without an acknowledgement mechanism, and the terminal will still stay in BWP2, in this case, DCI sent by the base station to the terminal in BWP3 will not be received by the terminal.
If there is a Timer-based BWP fallback mechanism, as shown in fig. 3, after the DCI indicating the BWP handover is missed, the base station switches to BWP3 and the terminal stays in BWP2, the terminal cannot receive the DCI sent by the base station in BWP3, when the BWP-inactivetiimer times out, the terminal automatically falls back to the default BWP, the base station sends DCI to the terminal on BWP3 without receiving a response from the terminal, and after a period of time, the terminal may also fall back to the default BWP, and continues to send DCI to the terminal on the default BWP, and resumes normal communication with the terminal. Thereafter, the base station may retransmit the DCI to the terminal in the default BWP, switching the terminal to BWP 3.
The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A method of BWP handover, comprising:
step 1, when the terminal works in default BWP, when the terminal has data service transmission, if the default BWP is not matched with the data service, the terminal sends BWP switching request information to a base station;
step 2, when the base station receives the BWP switching request message sent by the terminal equipment, the base station sends DCI signaling to inform the terminal user to carry out BWP switching and switches to a target BWP;
and 3, when the terminal performs data transmission on the non-default BWP, the terminal automatically starts a timer BWP-InactivationTimer, automatically triggers the BWP to fall back to the default BWP after the BWP-InactivationTimer is overtime, and starts to monitor PDCCH and data transmission on the default BWP.
2. The method for BWP handover according to claim 1, wherein in step 1, when the default BWP does not match the target BWP, the terminal sends a BWP handover request message to the base station, including:
when the terminal user has data service transmission, if the default BWP is not matched with the target BWP, the terminal sends a BWP switching request message to the base station;
the default BWP and the target BWP correspond to different data service scenarios of the end user respectively.
3. The method for BWP handover according to claim 1, wherein in step 1, the base station obtains the data traffic transmission requirement of the end user when operating in default BWP, comprising:
and acquiring the transmission rate requirement of the data service transmission requirement of the terminal user, and calculating the size of the target BWP according to the transmission rate.
4. The method for BWP handover according to claim 1, wherein in step 1, when the default BWP does not match the target BWP, the method further comprises sending a BWP handover request message to the base station, including:
and when the default BWP does not match the target BWP, if the terminal device is configured with the target BWP in advance, sending a target BWP switching request message to the base station.
5. The BWP handover method according to claim 1, wherein in step 2, the terminal incorrectly parses out DCI information, which results in missed DCI detection, the terminal still operates on the original BWP and cannot receive DCI information and service data sent by the base station on the new BWP until BWP-InactivityTimer times out, the terminal automatically switches to the default BWP, and starts to monitor PDCCH and data on the default BWP; the base station does not receive the HARQ-ACK feedback of the terminal for a period of time, automatically switches to the default BWP, starts to send DCI and service data on the default BWP, and recovers the communication with the terminal.
6. The BWP handover method according to claim 1, wherein the step 2, the receiving the BWP handover request message from the terminal device by the base station includes:
the base station correctly analyzes the BWP switching request message sent by the terminal equipment, and the BWP switching request message clearly indicates the position and the size of the target BWP to be switched.
7. The BWP switching method according to claim 1, wherein in step 2, the base station issues DCI signaling to notify the end user to perform BWP switching, comprising:
the base station issues DCI signaling according to the target BWP position and size indicated in the BWP handover request message, wherein the DCI signaling comprises the initial position of the target BWP, the size of the BWP and the handover opportunity of the BWP.
8. The BWP switching method according to claim 1, wherein in step 3, the terminal performs BWP-inactivytytytytytimer reset and operation according to whether the PDCCH is capable of parsing the DCI signaling, and when the data transmission is completed and the PDCCH is not monitored, the BWP-inactivytimer starts to operate, and when the PDCCH is monitored before BWP-inactivytimer times out, the BWP-inactivytimer is reset.
9. The method according to claim 1 or 2, wherein in step 3, if the terminal does not monitor the PDCCH until the BWP-inactivytimer times out, the terminal automatically switches to the default BWP and starts monitoring the PDCCH and data transmission on the default BWP.
10. The method of claim 1, wherein in step 3, the BWP-inactivity timer is started when BWP is activated, the bs starts data transmission on the new BWP, and the terminal switches to the activated BWP for data reception, and starts BWP-inactivity timer immediately after a BWP is activated.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115103413A (en) * | 2022-07-25 | 2022-09-23 | 深圳国人无线通信有限公司 | Method and system for planning BWP (broadband Access Point) resources by base station |
| CN115102678A (en) * | 2022-08-24 | 2022-09-23 | 深圳国人无线通信有限公司 | BWP switching method and system for co-building shared base station to meet user service requirement |
| WO2024016293A1 (en) * | 2022-07-21 | 2024-01-25 | 北京小米移动软件有限公司 | Bandwidth part (bwp) switching method, apparatus, communication device and storage medium |
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