CN114302465A - Rapid link recovery and switching method based on carrier aggregation - Google Patents
Rapid link recovery and switching method based on carrier aggregation Download PDFInfo
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- CN114302465A CN114302465A CN202111654053.1A CN202111654053A CN114302465A CN 114302465 A CN114302465 A CN 114302465A CN 202111654053 A CN202111654053 A CN 202111654053A CN 114302465 A CN114302465 A CN 114302465A
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- 230000002776 aggregation Effects 0.000 title claims abstract description 15
- 238000004220 aggregation Methods 0.000 title claims abstract description 15
- 238000011084 recovery Methods 0.000 title claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 230000000977 initiatory effect Effects 0.000 claims abstract description 10
- 230000003993 interaction Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 13
- 230000011664 signaling Effects 0.000 abstract description 6
- 239000000969 carrier Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000010295 mobile communication Methods 0.000 description 2
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Abstract
The invention relates to a fast link recovery and switching method based on carrier aggregation. The invention comprises the following steps: carrying out switching judgment on the quality of an uplink channel of the terminal; when the switching judgment is that the uplink channel quality of the terminal is poor, a pilot frequency measurement task is issued to the terminal; after the pilot frequency measurement task is completed, initiating a pilot frequency switching request to a target cell; and sending a pilot frequency switching command to the terminal to complete pilot frequency switching and CA auxiliary carrier addition. In a 5G multi-layer network scene, when the quality of an uplink signal of a terminal is changed to execute pilot frequency switching, the CA auxiliary carrier adding process can be directly executed in the switching process, the two processes are fused, the terminal only needs to be reconfigured once, the signaling overhead and the processing time delay are saved, and the influence on the user performance caused by pilot frequency measurement initiated by the CA auxiliary carrier adding is avoided.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a quick link recovery and switching method based on carrier aggregation.
Background
Carrier Aggregation (CA) technology can aggregate multiple NR component carriers together, providing a larger transmission bandwidth to a terminal. The NG-RAN (NG-Radio Access Network, NG Radio Access Network) decides in which direction (downlink and/or uplink) and which carriers to establish the CA according to the terminal capability.
When a 5G terminal carries out uplink and downlink services in an NG-RAN, the NG-RAN can monitor the uplink/downlink signal quality of the terminal, when the uplink or downlink signal quality of the terminal is degraded, cell switching can be triggered, and a switching target cell can be a same-frequency/different-frequency adjacent cell in a 5G system or a 4G different-system adjacent cell.
The problem of signal quality deterioration of the 5G frequency point is easy to appear in the uplink direction, and in order to guarantee the experience of the terminal in the uplink direction, the existing pilot frequency switching based on the uplink signal quality of the terminal is switched from a high-frequency-band large-bandwidth capacity layer to a low-frequency-band small-bandwidth basic covering layer. In order not to affect the downlink bandwidth, performing CA will increase the handover delay.
In addition, the existing cell switching and carrier aggregation are two completely independent technologies, as shown in fig. 1, after the terminal is switched to the pilot frequency cell, the base station can initiate UE measurement again according to the terminal capability, determine the channel quality of the frequency point of the source cell and other frequency points, and trigger CA auxiliary carrier addition. This process brings multiple reconfigurations to the terminal, increases signaling overhead, processing delay, and influences on user performance caused by pilot frequency measurement Gap, and is not beneficial to user perception.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a method for quickly recovering and switching a link based on carrier aggregation, which combines a pilot frequency switching process and a CA auxiliary carrier adding process, thereby saving signaling overhead and processing time delay.
The technical scheme adopted by the invention for realizing the purpose is as follows: a fast link recovery and switching method based on carrier aggregation comprises the following steps:
step 1, switching judgment is carried out on the quality of an uplink channel of a terminal;
step 2, when the switching judgment is that the quality of the uplink channel of the terminal is poor, a pilot frequency measurement task is sent to the terminal;
step 3, after the pilot frequency measurement task is completed, initiating a pilot frequency switching request to a target cell;
and 4, sending a pilot frequency switching command to the terminal to complete pilot frequency switching and CA auxiliary carrier addition.
Before step 1, the method further comprises:
the terminal is accessed in the source cell and carries out uplink and downlink services.
The step of issuing the pilot frequency measurement task to the terminal comprises the following steps:
a source cell of a terminal for performing uplink and downlink tasks sends a reconfiguration message to the terminal;
and according to the reconfiguration message, performing pilot frequency measurement and sending a pilot frequency measurement report to the source cell.
And the pilot frequency switching request carries the downlink signal quality information of the source cell and other co-frequency adjacent cells on the frequency point of the source cell, which is acquired from the pilot frequency measurement report.
The step 3 is followed by: and the target cell judges whether the frequency point of the source cell meets the addition condition of the downlink CA auxiliary carrier according to the pilot frequency switching request, if so, the step 4 is executed, otherwise, the step 2 is returned.
The initiating a pilot frequency handover request to the target cell specifically includes: after sending the pilot frequency measurement report to the source cell, judging that the target cell and the source cell are co-located, and initiating a pilot frequency switching request to the target cell through intra-site interaction.
And the pilot frequency switching command carries CA auxiliary carrier addition configuration information.
The invention has the following advantages and beneficial effects:
1. the invention is suitable for multi-frequency layer networking mobile scenes in all mobile communication fields, for example, in a 5G multi-layer network scene, when the quality of uplink signals of a terminal is degraded to execute pilot frequency switching, a source side base station stores MR historical pilot frequency information and transmits the MR historical pilot frequency information to a target base station, the target base station reconstructs configuration information after receiving MR pilot frequency measurement report information and combining the CA capability of the terminal, and then directly executes a CA auxiliary carrier adding process in the switching process, the two processes are fused, the terminal only needs to be reconfigured once, signaling overhead and processing time delay are saved, and the influence of pilot frequency measurement initiated by CA auxiliary carrier adding on user performance is avoided.
2. The invention is effective for the terminal which is in the carrier aggregation state or the non-carrier aggregation state before the switching, after the switching is finished, the uplink is transmitted on the new main carrier, and the downlink can be transmitted on a plurality of member carriers (the source frequency point and the target frequency point) at the same time, thereby ensuring the downlink experience of the user while ensuring the uplink.
Drawings
Fig. 1 is a flowchart of a cell handover and CA secondary carrier addition process in the prior art;
FIG. 2 is a flow chart of a method of an embodiment of the present invention;
fig. 3 is a flowchart of intra-station inter-frequency handover and CA secondary carrier addition processing in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
When the quality of uplink signals of the terminal is poor, signaling overhead and processing time delay are saved, and for switching meeting CA conditions, a target cell can directly perform CA auxiliary carrier addition in the switching process, the two processes are combined into one, and when the terminal only needs to be reconfigured once to perform different-frequency switching, downlink signal quality information of a source cell and other same-frequency adjacent cells on the frequency point where the source cell is located is carried in a switching request message, so that the target cell can judge whether the frequency point of the source cell meets the downlink CA auxiliary carrier addition conditions or not based on the information and the terminal capacity. Signaling overhead and processing time delay are saved, and the influence on user performance caused by pilot frequency measurement initiated by CA auxiliary carrier addition is avoided. After the switching is completed, the uplink is transmitted on the main carrier, while the downlink can be transmitted on two carriers (the source frequency point and the target frequency point) at the same time, and the downlink experience of the user is also guaranteed while the uplink is rapidly recovered.
As shown in fig. 2, a method for fast link recovery and handover based on carrier aggregation includes the following steps: step 1, switching judgment is carried out on the quality of an uplink channel of a terminal; step 2, when the switching judgment is that the quality of the uplink channel of the terminal is poor, a pilot frequency measurement task is sent to the terminal; step 3, after the pilot frequency measurement task is completed, initiating a pilot frequency switching request to a target cell; and 4, sending a pilot frequency switching command to the terminal to complete pilot frequency switching and CA auxiliary carrier addition.
Before step 1, the method further comprises: the terminal is accessed in the source cell and carries out uplink and downlink services.
The step of issuing the pilot frequency measurement task to the terminal comprises the following steps: a source cell of a terminal for performing uplink and downlink tasks sends a reconfiguration message to the terminal; and according to the reconfiguration message, performing pilot frequency measurement and sending a pilot frequency measurement report to the source cell.
And the pilot frequency switching request carries the downlink signal quality information of the source cell and other co-frequency adjacent cells on the frequency point of the source cell, which is acquired from the pilot frequency measurement report.
The step 3 is followed by: and the target cell judges whether the frequency point of the source cell meets the addition condition of the downlink CA auxiliary carrier according to the pilot frequency switching request, if so, the step 4 is executed, otherwise, the step 2 is returned.
The initiating a pilot frequency handover request to the target cell specifically includes: after sending the pilot frequency measurement report to the source cell, judging that the target cell and the source cell are co-located, and initiating a pilot frequency switching request to the target cell through intra-site interaction.
And the pilot frequency switching command carries CA auxiliary carrier addition configuration information.
As shown in fig. 3, the intra-station inter-frequency handover and CA secondary carrier addition processing flow includes the following steps: a terminal (UE) is accessed in a source cell (namely a source side base station) and carries out uplink and downlink services; the source cell detects that the uplink signal quality of the terminal is poor, and initiates an inter-frequency measurement task A4 or A5 through an RRCReconfiguration message; the method comprises the steps that a source cell receives a pilot frequency measurement report message (A4 or A5), judges that a target cell (namely a target base station) and the source cell share the same station, initiates a pilot frequency switching request to the target cell through in-station interaction, and carries downlink signal quality information of the source cell and other same-frequency adjacent cells on a frequency point where the source cell is located, wherein the information is obtained from the pilot frequency measurement report message. The target cell judges that the frequency point of the source cell meets the addition condition of the downlink CA auxiliary carrier based on the information and by combining the terminal capability, and completes the preparation process of pilot frequency switching and CA auxiliary carrier addition; a source cell initiates a pilot frequency switching command to a terminal through an RRCReconfiguration message, wherein the message simultaneously comprises CA auxiliary carrier addition related configuration information; the terminal sends RRCRECONFIfigurationComplete message to the target cell to complete the switching and CA auxiliary carrier adding process.
Claims (7)
1. A fast link recovery and switching method based on carrier aggregation is characterized by comprising the following steps:
step 1, switching judgment is carried out on the quality of an uplink channel of a terminal;
step 2, when the switching judgment is that the quality of the uplink channel of the terminal is poor, a pilot frequency measurement task is sent to the terminal;
step 3, after the pilot frequency measurement task is completed, initiating a pilot frequency switching request to a target cell;
and 4, sending a pilot frequency switching command to the terminal to complete pilot frequency switching and CA auxiliary carrier addition.
2. The method for fast link recovery and handover based on carrier aggregation according to claim 1, further comprising, before step 1:
the terminal is accessed in the source cell and carries out uplink and downlink services.
3. The method according to claim 1, wherein the step of issuing the inter-frequency measurement task to the terminal comprises the following steps:
a source cell of a terminal for performing uplink and downlink tasks sends a reconfiguration message to the terminal;
and according to the reconfiguration message, performing pilot frequency measurement and sending a pilot frequency measurement report to the source cell.
4. The method according to claim 3, wherein the pilot frequency handover request carries downlink signal quality information of the source cell and other co-frequency neighboring cells on a frequency point where the source cell is located, which is obtained from the pilot frequency measurement report.
5. The method for fast link recovery and handover based on carrier aggregation according to claim 4, further comprising after the step 3: and the target cell judges whether the frequency point of the source cell meets the addition condition of the downlink CA auxiliary carrier according to the pilot frequency switching request, if so, the step 4 is executed, otherwise, the step 2 is returned.
6. The method for fast link recovery and handover based on carrier aggregation according to claim 3, wherein the initiating the inter-frequency handover request to the target cell specifically comprises: after sending the pilot frequency measurement report to the source cell, judging that the target cell and the source cell are co-located, and initiating a pilot frequency switching request to the target cell through intra-site interaction.
7. The method as claimed in claim 1, wherein the inter-frequency handover command carries CA secondary carrier addition configuration information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111654053.1A CN114302465A (en) | 2021-12-30 | 2021-12-30 | Rapid link recovery and switching method based on carrier aggregation |
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| CN202111654053.1A CN114302465A (en) | 2021-12-30 | 2021-12-30 | Rapid link recovery and switching method based on carrier aggregation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114760668A (en) * | 2022-04-26 | 2022-07-15 | 中国电信股份有限公司 | Communication control method, system and base station |
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2021
- 2021-12-30 CN CN202111654053.1A patent/CN114302465A/en active Pending
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| CN114760668A (en) * | 2022-04-26 | 2022-07-15 | 中国电信股份有限公司 | Communication control method, system and base station |
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