CN107911826B - Method for identifying and avoiding PCI conflict - Google Patents
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- CN107911826B CN107911826B CN201711213940.9A CN201711213940A CN107911826B CN 107911826 B CN107911826 B CN 107911826B CN 201711213940 A CN201711213940 A CN 201711213940A CN 107911826 B CN107911826 B CN 107911826B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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Abstract
The invention discloses a method for identifying and avoiding PCI conflict, belonging to the field of mobile communication. The method is based on the existing SeNB adding process adopting authorized spectrum, the content that the SeNB informs the MeNB of the PCI is added, the requirement of unauthorized spectrum access is met, and the subsequent PCI identification is carried out; the content of RRM information reported by the UE to the MeNB according to the DRS signal broadcasted by the SeNB is increased, and the RRM information can be fused with the existing unlicensed spectrum access; the step that the MeNB adds the LAA cell with correct PCI to the UE according to the RRM information reported by the UE is added, so that the UE confirms that the added cell is from the cell belonging to the operator, and the conflict problem of the PCI is avoided.
Description
Technical Field
The invention belongs to the field of mobile communication, and particularly relates to a method for identifying and avoiding PCI conflicts.
Background
The increase of mobile devices and the rapid development of mobile internet have brought about the explosive growth of mobile data, and have posed a great challenge to the increase of network capacity. It is predicted that most mobile data traffic will occur indoors during the next 10 years, and that data rates will reach more than 1000 times the current data rates. The throughput of the network can be greatly improved by the adoption of the dense cell deployment mode, and a typical application scenario is that the function of unloading the data traffic of a macro cell part is realized by deploying a small cell. The 3GPP proposes a dual connectivity technology to enhance the small cell deployment scheme in the LTE-a heterogeneous network. Through the dual connectivity technology, the terminal may be connected to the MeNB and the SeNB at the same time, where the MeNB is mainly responsible for signaling transmission and mobility management, and the SeNB is mainly used for offloading data. Schedulers of the MeNB and the SeNB respectively manage wireless resources of respective base stations, and the schedulers are connected through a standard X2 interface to realize signaling and data interaction. Therefore, the dual connection technology can realize the improvement of the user throughput and ensure the mobile robustness by aggregating the wireless resources of at least two base stations. Compared with a heterogeneous network architecture based on a carrier aggregation technology, the heterogeneous network architecture based on a dual connectivity technology has lower performance requirements on a backhaul link between the MeNB and the SeNB, allows a larger transmission delay of an X2 interface, and allows the MeNB and the SeNB to be asynchronous in time.
On the other hand, the shortage of spectrum resources is an increasingly severe reality facing mobile communication networks. Licensed band, and particularly the more valuable low band resources, are not only bandwidth limited, but are also being consumed rapidly by an increasing group of users. Currently, 5GHz unlicensed frequency band has a significant portion of available spectrum worldwide, and operators and equipment manufacturers seek to improve system capacity by using the unlicensed frequency band. By introducing the LAA technology, LTE can be enabled to operate in the unlicensed frequency band as a supplement to the licensed spectrum, and coexistence with other existing wireless communication systems operating in the unlicensed frequency band is achieved.
By combining the dual connectivity technology with the LAA technology, as shown in fig. 1, the authorized spectrum is used between the MeNB and the user and the unlicensed spectrum is used between the SeNB and the user, so that respective performance advantages of the MeNB and the SeNB can be fully utilized, wherein the authorized spectrum is used for ensuring robustness of control signaling transmission, and the unlicensed spectrum is used for meeting the requirement of high data traffic in a hotspot region, and is an application scenario with great prospect in the future.
For a dual connectivity network architecture when the SeNB employs the licensed spectrum, an adding procedure of the SeNB is given in 3GPP TR 36.300, by which a UE context for allocating radio resources to the UE on the SeNB can be established, as shown in fig. 2.
However, when the SeNB employs unlicensed spectrum, PCI collision or confusion problems may occur when adding the SeNB, since different operators share the unlicensed frequency band. As shown in fig. 3, within the MeNB coverage area belonging to operator a, there are two senbs using the same unlicensed spectrum, and these two senbs belong to operator a and operator B, respectively, but are configured with the same PCI ═ 17. When the UE belonging to the operator a finds a certain LAA cell with a PCI of 17, the UE reports RRM information to the MeNB, reporting that it finds the cell with the PCI of 17. Since the MeNB knows that there is a LAA cell with PCI 17 in its coverage, the MeNB of operator a will add this cell as SeNB for the UE, however the LAA cell detected by the UE belongs to another operator B that is adjacent.
As can be seen from the above, different operators share the unlicensed frequency band under LAA, if PCI setting is not negotiated between the operators, PCI collision may occur, and is different from carrier aggregation, and under the dual connectivity condition, the PCell and the SCell are allowed to be out of synchronization, thereby increasing the probability that the user detects DRS signals on the SCell of other operators, and thus increasing the possibility of PCI collision between different operators. After the UE reports RRM information about the PCI on the unlicensed carrier to the MeNB, the MeNB erroneously adds an LAA cell belonging to another operator to the UE as an SCell. In this case, the UE may mistakenly initiate random access to a cell of another operator, which may result in a failure of the random access process and failure of subsequent data transmission.
Disclosure of Invention
Aiming at the problems in the prior art, the invention designs new method steps for the SeNB adding process based on the existing SeNB adding process adopting authorized spectrum, provides a method for identifying and avoiding PCI conflicts, and solves the problem of PCI conflicts based on unauthorized spectrum under a dual-connection architecture.
The method for identifying and avoiding PCI conflict provided by the invention comprises the following steps:
step 1, before the MeNB adds the SeNB to the UE, the MeNB can collect information of the peripheral SeNB, such as the switch state of the SeNB, the PCI information of the SeNB and the like; the collection may be designed to be triggered, or may be designed to be periodic, that is, the MeNB may request information of the SeNB through an X2 interface according to an event or the SeNB periodically reports the information to the MeNB;
step 2, sending DRS signals obeying LBT by SeNB broadcast, reporting RRM measurement information including RSRP, RSRQ, average RSSI, channel occupation condition, PCI information and the like to MeNB by UE according to the DRS signals;
step 3, the MeNB determines whether to configure the SeNB for the UE according to the measurement information reported by the UE and the QoS information of the UE by combining the load level of the MeNB, and if so, the step 4 is executed; otherwise, ending;
step 4, the MeNB selects the SeNB which has known PCI information of the SCell belonging to the operator and under the coverage of the operator and has the strongest signal intensity according to the measurement information reported by the UE, and the MeNB sends the SeNB addition request information to the SeNB through an X2 interface; the addition request information carries C-RNTI of the UE, E-RAB context to be shunted (including TNL information), capability of the UE and the like;
step 5, the SeNB executes an admission control algorithm and receives the addition request information;
step 6, the SeNB sends an adding command message to the MeNB, wherein the adding command message carries contents such as a new wireless network temporary identifier distributed to the UE, a special random access lead code and the like;
and 7: the MeNB informs the UE to prepare to monitor the LAA Scell, the MeNB starts a timer for timing, and the timing time is at least longer than the total time length of the step 8 and the step 9;
and 8: the SeNB forwards an addition request message from the MeNB to the UE;
and step 9: if the UE receives the addition request message forwarded from the SeNB, it indicates that the SeNB belongs to the operator, and the UE sends an addition completion confirmation message to the MeNB, and performs step 10; if the service provider is not the operator, the UE cannot correctly receive the addition request information forwarded by the SeNB;
if the MeNB does not receive the message for confirming the addition completion sent by the UE within the timer, the MeNB may consider that the SeNB reported before the UE does not belong to the operator, and change the PCI configuration for the SeNB of the operator with the same PCI information, and re-execute step 1;
step 10, the MeNB sends an RRC connection reconfiguration command to the UE, wherein the RRC connection reconfiguration command comprises radio resource configuration carried by the SCG;
step 11: the UE applies the new configuration and replies the MeNB RRC connection reconfiguration completion information;
step 12: the MeNB informs the SeNB that the UE has completed the reconfiguration step;
step 13: the UE initiates a random access process to the PSCell of the SeNB.
The invention has the advantages that:
1. compared with the existing SeNB adding step when the authorized spectrum is adopted, the method increases the content that the SeNB informs the MeNB of the PCI, and carries out subsequent PCI identification in order to meet the requirement of unauthorized spectrum access. This is in contrast to the addition step when licensed spectrum is employed.
2. The invention increases the content of RRM information reported by the UE to the MeNB according to the DRS signal broadcasted by the SeNB, so the invention can be integrated with the existing unlicensed spectrum access.
3. The invention adds the step that the MeNB adds the LAA cell with correct PCI to the UE according to the RRM reported by the UE, so that the UE confirms that the added cell is from the cell belonging to the operator, and the conflict problem of the PCI is avoided.
Drawings
Fig. 1 is a schematic diagram of a scenario of using unlicensed spectrum based on LAA between an SeNB and a user in a dual connectivity architecture in the prior art.
Fig. 2 is a schematic diagram of an existing SeNB addition procedure when licensed spectrum is used.
Fig. 3 is a diagram illustrating a scenario of PCI collision in the prior art.
Fig. 4 is a schematic diagram illustrating an SeNB addition process under the LAA architecture according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention provides a method for identifying and avoiding PCI conflicts, which is a method for identifying and avoiding PCI conflicts when different operator SeNB base stations using unauthorized frequency spectrums are added under a double-connection architecture. As shown in fig. 4, the method for identifying PCI collision includes the following steps 1 to 8:
step 1, information collection is carried out by the MeNB: according to the existing SeNB adding process, the MeNB collects the information of the SeNB;
step 2, reporting RRM to MeNB by UE: the UE reports RRM measurement information to the MeNB according to the DRS signal broadcasted by the SeNB, wherein the measurement information comprises RSRP, RSRQ, average RSSI, channel occupation condition and PCI information;
and step 3, adding an SeNB decision: the MeNB combines the Qos information of the UE and the load level of the MeNB according to the RRM measurement information reported by the UE to judge whether to configure the SeNB for the UE, if so, the step 4 is executed, otherwise, the step is ended;
step 4, the MeNB sends the SeNB addition request information to the SeNB: the method comprises the steps that according to RRM measurement information reported by UE, the MeNB selects the SeNB which has information of SCells which are known to the MeNB, belong to an operator and are under the coverage of the operator and have the strongest signal strength to send SeNB adding request information; the adding request carries C-RNTI information of the UE, E-RAB context to be shunted (including TNL information), capability of the UE and the like so as to facilitate subsequent identification of the SeNB;
step 5, admission control: the SeNB executes an admission control algorithm and receives the addition request information;
step 6, the SeNB agrees to add: if the SeNB accepts the addition request, sending an addition approval command message to the MeNB; the adding command message carries contents such as a new wireless network temporary identifier allocated to the UE, a special random access preamble code and the like;
step 7, the MeNB informs the UE to prepare to monitor the LAA SCell, and the MeNB starts a timer to time, wherein the timing time is at least longer than the total duration of the step 8 and the step 9;
step 8, the SeNB forwards the addition request information from the MeNB to the UE;
the method for avoiding PCI collision comprises the following steps 9 to 13:
step 9, if the UE receives the addition request information forwarded by the SeNB, indicating that the SeNB belongs to the operator, the UE sends an addition confirmation completion message to the MeNB, and performs step 10; if the service provider is not the operator, the UE cannot correctly receive the addition request information forwarded by the SeNB; if the MeNB does not receive the message for confirming the addition completion sent by the UE within the time limited by the timer, the MeNB may consider that the SeNB reported before by the UE does not belong to the operator, change the PCI configuration for the SeNB of the operator with the same PCI information, and re-execute step 1;
step 10, the MeNB sends an RRC connection reconfiguration command to the UE, wherein the RRC connection reconfiguration command comprises radio resource configuration carried by the SCG;
step 11: the UE applies the new configuration and replies the MeNB RRC connection reconfiguration completion information;
step 12: the MeNB informs the SeNB that the UE has completed the reconfiguration step;
step 13: the UE initiates a random access process to the PSCell of the SeNB.
The present invention will be described in further detail with reference to examples.
(1) The MeNB belonging to the operator A collects information of the SeNB within the coverage range;
(2) the UE belonging to an operator A discovers an LAA cell suitable for access according to a DRS signal on an unauthorized frequency band, and reports RRM measurement information to a MeNB; at this time, the SeNB ascertained by the UE belongs to operator B;
(3) the MeNB determines to add the SeNB according to the Qos information of the UE and the load level of the MeNB;
(4) the MeNB compares the PCIs contained in the RRM measurement information reported by the UE with the known PCIs of the surrounding senbs, finds that the PCIs contained in the RRM measurement information belong to the operator a, and sends an addition request to the SeNB a (SeNB belonging to the operator a);
(5) SeNB a performs admission control;
(6) the SeNB A sends an addition agreement message to the MeNB after judging;
(7) the MeNB starts a timer and simultaneously informs the UE of preparing to monitor the LAA cell;
(8) the method comprises the steps that the SeNB A forwards a MeNB confirmation adding request message to the UE, and the UE cannot correctly receive the MeNB confirmation adding request message from the SeNB A in the coverage range of the SeNB B;
(9) within the timing time, if the MeNB cannot receive the addition confirmation completion message fed back by the UE, the MeNB considers that the UE is accessed to the SeNB which is not the operator; the MeNB modifies the PCI configuration for the SeNB with the same PCI of the operator; re-executing the step 1 until the MeNB correctly receives the confirmation addition completion information sent by the UE, executing the step 10;
(10) the MeNB sends an RRC connection reconfiguration command to the UE;
(11) the UE applies the new configuration and replies the MeNB RRC connection reconfiguration completion information;
(12) the MeNB informs the SeNB that the UE has completed the reconfiguration step;
(13) the UE initiates a random access process to the PSCell of the SeNB.
The definitions of the letter parameters involved in the present invention are shown in the following table 1:
TABLE 1 definition of alphabetical parameters
Claims (7)
1. A method for identifying and avoiding PCI conflicts is characterized in that the method for identifying and avoiding PCI conflicts comprises the following steps;
step 1, before the MeNB adds the SeNB for the UE, the MeNB collects the information of the SeNB;
step 2, the SeNB broadcasts and sends a DRS signal obeying LBT, and the UE reports RRM measurement information to the MeNB according to the DRS signal;
step 3, the MeNB determines whether to configure the SeNB for the UE according to the RRM measurement message reported by the UE and the QoS information of the UE by combining the load level of the MeNB, if so, the step 4 is executed, otherwise, the step is ended;
step 4, the MeNB selects the SeNB with known PCI information of the SCell belonging to the operator and under the coverage of the operator and the strongest signal intensity according to the RRM measurement message reported by the UE, and the MeNB sends the SeNB addition request message to the SeNB through an X2 interface;
step 5, the SeNB executes an admission control algorithm and receives the addition request information;
step 6, the SeNB sends an adding command message to the MeNB;
and 7: the MeNB informs the UE to prepare to monitor the LAA Scell, and the MeNB starts a timer for timing;
and 8: the SeNB forwards an addition request message from the MeNB to the UE;
and step 9: if the UE receives the addition request message forwarded from the SeNB, it indicates that the SeNB belongs to the operator, and the UE sends an addition completion confirmation message to the MeNB, and performs step 10; if the service provider is not the operator, the UE cannot correctly receive the addition request information forwarded by the SeNB;
if the MeNB does not receive the message for confirming the addition completion sent by the UE within the timing time of the timer, the MeNB considers that the previously reported SeNB of the UE does not belong to the operator, and changes the PCI configuration for the SeNB of the operator with the same PCI information, and re-executes the step 1;
step 10, the MeNB sends an RRC connection reconfiguration command to the UE;
step 11: the UE uses the new configuration and replies the MeNB RRC connection reconfiguration completion information;
step 12: the MeNB informs the SeNB UE that the reconfiguration step is completed;
step 13: the UE initiates a random access process to the PSCell of the SeNB.
2. The method of claim 1, wherein the step of identifying and avoiding PCI collisions comprises: the information of the SeNB collected by the MeNB in step 1 includes the switch state of the SeNB and the PCI information of the SeNB.
3. The method of claim 1, wherein the step of identifying and avoiding PCI collisions comprises: the collection in step 1 is designed to be triggered or designed to be periodic, that is, the MeNB may request information of the SeNB through an X2 interface according to an event or the SeNB periodically reports the information to the MeNB.
4. The method of claim 1, wherein the step of identifying and avoiding PCI collisions comprises: the RRM measurement message in step 2 includes RSRP, RSRQ, average RSSI, channel occupancy, and PCI information.
5. The method of claim 1, wherein the step of identifying and avoiding PCI collisions comprises: and 4, the addition request information carries the C-RNTI of the UE, the E-RAB context to be distributed and the capability of the UE.
6. The method of claim 1, wherein the step of identifying and avoiding PCI collisions comprises: and 6, the adding command message carries a new wireless network temporary identifier and a special random access preamble which are allocated to the UE.
7. The method of claim 1, wherein the step of identifying and avoiding PCI collisions comprises: the RRC connection reconfiguration command described in step 10 includes radio resource configuration for SCG bearer.
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| CN111770508B (en) | 2019-03-30 | 2022-05-06 | 华为技术有限公司 | PCI conflict detection and optimization method, device and system |
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| CN105228171A (en) * | 2014-05-30 | 2016-01-06 | 中国电信股份有限公司 | The self-configuration method of the little base station of dual link and system in heterogeneous network |
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