CN115529644A - Method for improving success rate based on Xn interface and NR system - Google Patents
Method for improving success rate based on Xn interface and NR system Download PDFInfo
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- CN115529644A CN115529644A CN202211130859.5A CN202211130859A CN115529644A CN 115529644 A CN115529644 A CN 115529644A CN 202211130859 A CN202211130859 A CN 202211130859A CN 115529644 A CN115529644 A CN 115529644A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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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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Abstract
The invention provides a method for improving success rate based on an Xn interface and an NR system, wherein the method comprises the following steps: by optimally designing Xn interface signaling, a new reason enumeration is added in a Cause cell of a 38.423 protocol: the UE does not support the BWP bandwidth, and the reason for feeding back the switching failure from the target cell to the source cell when switching based on the Xn interface is that the UE does not support each BWP bandwidth of the target cell. The invention can effectively reduce the times of switching failure caused by the mismatch of the maximum bandwidth supported by the UE and the BWP bandwidth of the target cell based on the Xn interface switching, and is favorable for improving the success rate of the Xn interface switching.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for improving success rate based on an Xn interface and an NR system.
Background
The protocol of the 3GPP wireless NR system 38.331 defines BWP (BandWidth Part, which is a continuous BandWidth in a cell configuration frequency band and may be smaller than or equal to the cell BandWidth) configuration parameters, so as to flexibly configure the BWP where the UE operates in various bandwidths. The relevant protocol definition is shown in fig. 1.
The BWP bandwidth that the UE can operate is constrained by the UE capability, and the BWP bandwidth cannot be larger than the bandwidth indicated by the UE capability. The UE capability related parameters are defined in the 38.331 protocol as shown in fig. 2.
When UE initiates HANDOVER based on Xn interface, if bandwidth of each BWP configured by target cell is larger than maximum bandwidth supported by UE, then target cell can not allocate resource for UE, only reply HANDOVER PRERATION FAILURE message to source cell at Xn interface, and feedback HANDOVER fails.
The HANDOVER FAILURE message carries a Cause cell, which indicates the Cause of the HANDOVER FAILURE. However, no proper reason is defined in the Cause cell, so that the source cell can know that the handover failure is because the bandwidth of the target cell BWP exceeds the capability of the UE, and the subsequent source cell can select UEs with the same or worse bandwidth capability to initiate handover to the target cell, which all Cause handover failure because the target cell cannot allocate resources, thereby reducing the success rate of handover based on the Xn interface.
Disclosure of Invention
The invention aims to provide a method for improving success rate based on an Xn interface and an NR (noise ratio) system, so as to solve the problem of switching success rate reduction caused by switching failure because BWP (broadband over protocol) bandwidth of a target cell exceeds the maximum bandwidth supported by UE (user equipment) during switching based on the Xn interface in a 3GPP (third generation partnership project) wireless NR system.
The invention provides a method for improving the success rate based on an Xn interface, which comprises the following steps:
by optimally designing the Xn interface signaling, a new reason enumeration is added in a Cause cell of the 38.423 protocol: the UE does not support the BWP bandwidth, and the reason for feeding back the switching failure from the target cell to the source cell when switching based on the Xn interface is that the UE does not support each BWP bandwidth of the target cell.
Further, the UE does not support BWP bandwidths of the target cell means:
the UE supports a maximum bandwidth smaller than the bandwidth of each BWP of the target cell.
Further, when the value of the Cause cell acquired by the source cell in the HANDOVER permission message is that the UE does not support the BWP bandwidth, the maximum bandwidth of the UE that fails to HANDOVER is saved and used as the HANDOVER bandwidth threshold of the target cell, and when a HANDOVER target cell is subsequently selected for another UE, if the maximum bandwidth supported by the UE to be handed over is smaller than the HANDOVER bandwidth threshold of the HANDOVER target cell, the cell is not selected as the HANDOVER target cell.
Further, the process of switching the Xn interface by using the method includes the following steps:
s1, a source cell sends a HANDOVER REQUEST message to a target cell by taking the maximum cell bandwidth defined by a protocol as a HANDOVER bandwidth threshold, and initiates the HANDOVER based on an Xn interface;
s2, the target cell acquires the maximum bandwidth which can be supported by the UE in the cell from the UE capability information parameter of the HANDOVER REQUEST message, compares the maximum bandwidth with each BWP bandwidth of the cell one by one, if the bandwidth of all the BWPs is greater than the maximum bandwidth which can be supported by the UE, replies a HANDOVER allocation FAILURE message to the source cell, and the Cause cell in the HANDOVER FAILURE message fills in the bandwidth which cannot be supported by the UE;
s3, the source cell acquires that the Cause cell in the HANDOVER FAILURE message is that the UE does not support the BWP bandwidth, compares the HANDOVER bandwidth threshold of the target cell with the maximum bandwidth supported by the UE with the HANDOVER FAILURE, and updates the HANDOVER bandwidth threshold of the target cell to the maximum bandwidth supported by the UE if the maximum bandwidth supported by the UE is less than the current HANDOVER bandwidth threshold of the target cell;
s4, if the UE initiates the Xn interface switching, when selecting the switching target cell for the UE, comparing the maximum bandwidth supported by the UE with the switching bandwidth threshold of the candidate cell, if the maximum bandwidth supported by the UE is less than the switching bandwidth threshold, then not selecting the candidate cell as the switching target cell.
Further, the BWP bandwidth not supported by the UE is expressed in the Cause cell of the 38.423 protocol as:
BWP Bandwidth Not Supported by UE。
the invention also provides an NR system, which is used for carrying out the Xn interface switching-based process by adopting the method for improving the success rate of the Xn interface.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention can effectively reduce the times of switching failure caused by the mismatch of the maximum bandwidth supported by the UE and the BWP bandwidth of the target cell based on the Xn interface switching, and is favorable for improving the success rate of the Xn interface switching.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and it is obvious for those skilled in the art that other related drawings can be obtained according to these drawings without inventive efforts.
Fig. 1 is a BWP parameter definition diagram of the 3gpp 38.331 protocol.
Fig. 2 is a diagram of UE supported bandwidth definition of the 3gpp 38.331 protocol.
Fig. 3 is a definition diagram of Cause enumeration of a newly added Cause of a 3GPP 38.423 protocol in the embodiment of the present invention.
Fig. 4 is a flowchart illustrating the Xn interface switching after adding new Cause enumeration in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The embodiment provides a method for improving success rate based on an Xn interface, which includes:
by optimally designing the Xn interface signaling, a new reason enumeration is added in a Cause cell of the 38.423 protocol: the UE does Not support the BWP Bandwidth (BWP Bandwidth Not Supported by UE, as shown in fig. 3), and is configured to feed back the reason for the failure of handover to the source cell by the target cell when performing handover based on the Xn interface, that the UE does Not support each BWP Bandwidth of the target cell. Wherein, that the UE does not support each BWP bandwidth of the target cell means: the UE supports a maximum bandwidth smaller than the bandwidth of each BWP of the target cell.
Therefore, when the value of the Cause cell acquired by the source cell in the HANDOVER direction FAILURE message is that the UE does not support the BWP bandwidth, the maximum bandwidth of the UE that fails to HANDOVER is saved as the HANDOVER bandwidth threshold of the target cell, and when a HANDOVER target cell is subsequently selected for other UEs, if the maximum bandwidth supported by the UE to be handed over is less than the HANDOVER bandwidth threshold of the HANDOVER target cell, the cell is not selected as the HANDOVER target cell.
Through the above design, as shown in fig. 4, the process of performing Xn interface switching by using the method includes the following steps:
s1, a source cell sends a HANDOVER REQUEST message to a target cell by taking the maximum cell bandwidth defined by a protocol as a HANDOVER bandwidth threshold, and initiates the HANDOVER based on an Xn interface;
s2, the target cell acquires the maximum Bandwidth which can be Supported by the UE in the cell from the UE capability information parameter of the HANDOVER REQUEST message, compares the maximum Bandwidth with each BWP Bandwidth of the cell one by one, if the Bandwidth of all the BWPs is larger than the maximum Bandwidth which can be Supported by the UE, replies a HANDOVER preamble FAILURE message to the source cell, and fills in a Cause cell in the HANDOVER FAILURE message that the UE does Not support the BWP Bandwidth (BWP Bandwidth Not Supported by UE);
s3, the source cell acquires that the Cause cell in the HANDOVER preamble FAILURE message is the UE which does Not support the BWP Bandwidth (BWP Bandwidth Not Supported by the UE), compares the HANDOVER Bandwidth threshold of the target cell with the maximum Bandwidth Supported by the UE which fails in HANDOVER, and updates the HANDOVER Bandwidth threshold of the target cell to the maximum Bandwidth Supported by the UE if the maximum Bandwidth Supported by the UE is less than the current HANDOVER Bandwidth threshold of the target cell;
s4, if the UE initiates the Xn interface switching, comparing the maximum bandwidth supported by the UE with the switching bandwidth threshold of the candidate cell, if the maximum bandwidth supported by the UE is less than the switching bandwidth threshold, then not selecting the candidate cell as the switching target cell.
Example 2
This embodiment implements an NR system, where the NR system is configured to perform a procedure based on Xn interface switching by using the method for improving the success rate based on Xn interface according to embodiment 1, specifically:
s1, a source cell sends a HANDOVER REQUEST message to a target cell by taking the maximum cell bandwidth defined by a protocol as a HANDOVER bandwidth threshold, and initiates the HANDOVER based on an Xn interface;
s2, the target cell acquires the maximum Bandwidth which can be Supported by the UE in the cell from the UE capability information parameter of the HANDOVER REQUEST message, compares the maximum Bandwidth with the BWP bandwidths of the cell one by one, if the bandwidths of all the BWPs are larger than the maximum Bandwidth which can be Supported by the UE, replies a HANDOVER preamble FAILURE message to the source cell, and a Cause cell in the HANDOVER preamble FAILURE message fills in the UE which does Not support the BWP Bandwidth (BWP Bandwidth Not Supported by UE);
s3, the source cell acquires that the Cause cell in the HANDOVER preamble FAILURE message is the UE which does Not support the BWP Bandwidth (BWP Bandwidth Not Supported by the UE), compares the HANDOVER Bandwidth threshold of the target cell with the maximum Bandwidth Supported by the UE which fails in HANDOVER, and updates the HANDOVER Bandwidth threshold of the target cell to the maximum Bandwidth Supported by the UE if the maximum Bandwidth Supported by the UE is less than the current HANDOVER Bandwidth threshold of the target cell;
s4, if the UE initiates the Xn interface switching, when selecting the switching target cell for the UE, comparing the maximum bandwidth supported by the UE with the switching bandwidth threshold of the candidate cell, if the maximum bandwidth supported by the UE is less than the switching bandwidth threshold, then not selecting the candidate cell as the switching target cell.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 method for improving success rate based on an Xn interface is characterized by comprising the following steps:
by optimally designing Xn interface signaling, a new reason enumeration is added in a Cause cell of a 38.423 protocol: the UE does not support the BWP bandwidth, and the reason why the target cell feeds back the switching failure to the source cell when the Xn interface is used for switching is that the UE does not support each BWP bandwidth of the target cell.
2. The method of claim 1, wherein the method for improving success rate based on an Xn interface is that the UE does not support BWP bandwidths of the target cell is:
the UE supports a maximum bandwidth smaller than the bandwidth of each BWP of the target cell.
3. The method according to claim 2, wherein when the value of Cause cell acquired by the source cell in the HANDOVER permission FAILURE message indicates that the UE does not support BWP bandwidth, the maximum bandwidth of the UE that failed to HANDOVER is saved as the HANDOVER bandwidth threshold of the target cell, and when a HANDOVER target cell is subsequently selected for another UE, if the maximum bandwidth supported by the UE to be handed over is smaller than the HANDOVER bandwidth threshold of the HANDOVER target cell, the cell is not selected as the HANDOVER target cell.
4. The method for improving the success rate based on the Xn interface according to claim 1, wherein the process of switching the Xn interface by using the method comprises the following steps: :
s1, a source cell sends a HANDOVER REQUEST message to a target cell by taking the maximum cell bandwidth defined by a protocol as a HANDOVER bandwidth threshold, and initiates the HANDOVER based on an Xn interface;
s2, the target cell acquires the maximum bandwidth which can be supported by the UE in the cell from the UE capability information parameter of the HANDOVER REQUEST message, compares the maximum bandwidth with each BWP bandwidth of the cell one by one, replies a HANDOVER PREPARATION FAILURE message to the source cell if the bandwidth of all the BWPs is greater than the maximum bandwidth which can be supported by the UE, and fills the UE in a Cause cell in the HANDOVER PREPARATION FAILURE message without supporting the BWP bandwidth;
s3, the source cell acquires that the Cause cell in the HANDOVER FAILURE message is that the UE does not support the BWP bandwidth, compares the HANDOVER bandwidth threshold of the target cell with the maximum bandwidth supported by the UE with the HANDOVER FAILURE, and updates the HANDOVER bandwidth threshold of the target cell to the maximum bandwidth supported by the UE if the maximum bandwidth supported by the UE is less than the current HANDOVER bandwidth threshold of the target cell;
s4, if the UE initiates the Xn interface switching, comparing the maximum bandwidth supported by the UE with the switching bandwidth threshold of the candidate cell, if the maximum bandwidth supported by the UE is less than the switching bandwidth threshold, then not selecting the candidate cell as the switching target cell.
5. The method of claim 1, wherein the BWP non-supported capability of UE is expressed in Cause cell of 38.423 protocol as:
BWP Bandwidth Not Supported by UE。
6. an NR system, wherein the NR system is configured to perform a Xn interface-based handover procedure according to any one of claims 1 to 5 by using the method for improving the success rate of the Xn interface.
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Citations (5)
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| CN104853390A (en) * | 2015-05-28 | 2015-08-19 | 武汉邮电科学研究院 | Failure handling method for S1 handover preparation phase of LTE system |
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| CN112600633A (en) * | 2020-12-15 | 2021-04-02 | Oppo广东移动通信有限公司 | BWP switching method and terminal equipment |
| US20210135729A1 (en) * | 2019-10-31 | 2021-05-06 | Qualcomm Incorporated | Frequency domain segmentation for performance enhancement of channel state feedback |
| CN113785618A (en) * | 2019-08-15 | 2021-12-10 | 华为技术有限公司 | Communication method and device |
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- 2022-09-16 CN CN202211130859.5A patent/CN115529644A/en active Pending
Patent Citations (5)
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| CN104853390A (en) * | 2015-05-28 | 2015-08-19 | 武汉邮电科学研究院 | Failure handling method for S1 handover preparation phase of LTE system |
| CN113785618A (en) * | 2019-08-15 | 2021-12-10 | 华为技术有限公司 | Communication method and device |
| CN110519853A (en) * | 2019-09-06 | 2019-11-29 | 中兴通讯股份有限公司 | Switching instruction method, switching method, device, service node, terminal and medium |
| US20210135729A1 (en) * | 2019-10-31 | 2021-05-06 | Qualcomm Incorporated | Frequency domain segmentation for performance enhancement of channel state feedback |
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Non-Patent Citations (1)
| Title |
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